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The task of detecting, identifying, and engaging asymmetric threats operating amongst
civilian populations is a significant challenge for modern armies. Enemy activities in
urban areas can be very difficult to detect and monitor using traditional intelligence,
surveillance, and reconnaissance (ISR) assets. The concept of Persistent Surveillance
provides a new methodology for detecting and identifying hostile forces operating
amongst civilians in urban battlefields. The sensors, platforms, and data architectures
which compose a persistent surveillance system must be chosen to maximize coverage
and minimize obscuration while providing timely and relevant data to friendly forces on
the ground. An illustrative example considering the specific operational concepts and
resulting system choices for optimizing an airborne infrared persistent imaging system
will be discussed.
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Significant advances are being made in exploiting the benefits of hybrid imaging techniques, partly as a result
of the evolution in modern focal plane technologies and the ability to process the outputs of the detector array
using fast algorithms on a real time basis. Such advances are appearing in areas as diverse as coded aperture
imaging, pupil plane encoding and compressive sensing. In some cases it is also possible to address the
challenges presented in discriminative imagery, with a goal of reducing the datasets associated with
polarimetry or spectral hypercubes. This paper will present a review of advances in the field, with particular
attention to the consideration of advanced adaptive coded aperture techniques.
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Light field cameras can simultaneously capture the spatial location and angular direction of light rays emanating from a
scene. By placing a variable bandpass filter in the aperture of a light field camera, we demonstrate the ability to
multiplex the visible spectrum over this captured angular dimension. The result is a novel design for a single-snapshot
multispectral imager, with digitally reconstructed images exhibiting reduced spatial resolution proportional to the
number of captured spectral channels. This paper explores the effect of this spatial-spectral resolution tradeoff on
camera design. It also examines the concept of utilizing a non-uniform pinhole array to achieve varying spectral and
spatial capture over the extent of the sensor. Images are presented from several different light field - variable bandpass
filter designs, and limitations and sources of error are discussed.
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The Defense Advanced Research Projects Agency (DARPA) is in a unique position to question traditional sensing architectures and concepts while possessing both the charter and funding to explore and develop the technologies necessary to accomplish both existing and desired applications. This paper describes the re-thinking of the Optical Processing system when applied to non-imaging sensors.
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Imaging and Non-Imaging Diffraction System Concepts
In a previous paper we presented initial results for sub-detector-pixel imaging in the mid-wave infra-red (MWIR) using
an imager equipped with a coded-aperture based on a re-configurable MOEMS micro-shutter. It was shown in laboratory
experiments that sub-pixel resolution is achievable via this route.
The purpose of the current paper is to provide detail on the reconstruction method and to discuss some challenges which
arise when imaging real-world scenes. The number of different mask patterns required to achieve a certain degree of
super-resolution is also discussed. New results are presented to support the theory.
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Feature-specific imaging (FSI) is a method by which non-traditional projections of object space may be computed
directly in the optical domain. The resulting feature-specific measurements provide the advantages of reduced
hardware complexity and improved measurement SNR. This SNR advantage translates into improved task (e.g.,
target recognition and/or tracking) performance. Adaptive FSI refers to any FSI system for which the results
of previous measurements are used to determine future measurement basis vectors. This paper will describe
an adaptive FSI system based on the sequential hypothesis testing approach. We will quantify the benefits of
adaptation for a M-class recognition task, and present an extension of the AFSI system to incorporate null
hypothesis.
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Motion tracking in persistent surveillance applications enters an interesting regime when the movers are of a size
on the order of the image resolution elements or smaller. In this case, for reasonable scenes, information about the
movers is a natively sparse signal - in an observation of a scene at two closely separated time-steps, only a small
number of locations (those associated with the movers) will have changed dramatically. Thus, this particular
application is well-suited for compressive sensing techniques that attempt to efficiently measure sparse signals.
Recently, we have been investigating two different approaches to compressive measurement for this application.
The first, differential Combinatorial Group Testing (dCGT), is a natural extension of group testing ideas to
situations where signal differences are sparse. The second methodology is an ℓ-1-minimization based recovery
approach centered on recent work in random (and designed) multiplex sensing. In this manuscript we will
discuss these methods as they apply to the motion tracking problem, discuss various performance limits, present
early simulation results, and discuss notional optical architectures for implementing a compressive measurement
scheme.
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Traditionally, coded aperture techniques have been applied to short-wavelength imaging: X-rays and γ-rays. For these
wavelengths, it is valid to neglect diffraction and describe the operation of the imager in purely geometric-optics terms.
We have investigated coded aperture imaging in the visible band. The much longer wavelengths in this region of the
spectrum mean that diffraction effects cannot be neglected. We describe the effects of diffraction and the implications for
image resolution. We present experimental results from a lens-free coded-aperture imager operating in the visible band
and describe the techniques used to obtain good quality images of complex greyscale scenes.
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We consider the application of compressive imaging theory to the problem of persistent surveillance. As the compressive sensing theory enjoys significant research attention, the application areas for compressive imaging have not kept pace without an optical architecture which could directly improve current sensing capabilities. This paper overviews two methodologies for image multiplexing; each showing a dramatic (2 orders of magnitude) increase in performance for the persistent surveillance application. Field-of-View Multiplexing and time domain multiplexing are discussed and a simulated example is given which shows an increase in performance over current capabilities.
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Diverse physical measurements can be modeled by X-ray transforms. While X-ray tomography is the canonical
example, reference structure tomography (RST) and coded aperture snapshot spectral imaging (CASSI)
are examples of physically unrelated but mathematically equivalent sensor systems. Historically, most x-ray
transform based systems sample continuous distributions and apply analytical inversion processes. On the other
hand, RST and CASSI generate discrete multiplexed measurements implemented with coded apertures. This
multiplexing of coded measurements allows for compression of measurements from a compressed sensing perspective.
Compressed sensing (CS) is a revelation that if the object has a sparse representation in some basis,
then a certain number, but typically much less than what is prescribed by Shannon's sampling rate, of random
projections captures enough information for a highly accurate reconstruction of the object. This paper investigates
the role of coded apertures in x-ray transform measurement systems (XTMs) in terms of data efficiency
and reconstruction fidelity from a CS perspective. To conduct this, we construct a unified analysis using RST
and CASSI measurement models. Also, we propose a novel compressive x-ray tomography measurement scheme
which also exploits coding and multiplexing, and hence shares the analysis of the other two XTMs. Using this
analysis, we perform a qualitative study on how coded apertures can be exploited to implement physical random
projections by "regularizing" the measurement systems. Numerical studies and simulation results demonstrate
several examples of the impact of coding.
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We present an investigation of the performance of coded aperture optical systems where the elements of a set of binary
coded aperture masks are applied over a sequence of acquired images. In particular, we are interested in investigating
code sequences and image reconstruction algorithms that reduce the optical fidelity and hardware requirements for the
system. Performance is jointly tied to the mask design, the image estimation algorithm, and the inherent optical response
of the system. As such, we adopt a simplified reconstruction model and consider generalized optical system aberrations
in designing masks used for multi-frame reconstruction of the imagery. We also consider the case of non-Nyquist
sampled (aliased) imagery. These investigations have focused on using a regularized least-squares reconstruction model
and mean squared error as a performance metric. Masks are found by attempting to minimize a closed form objective
that predicts the mean squared error for the reconstruction algorithm. We find that even with suboptimal solutions that
binary masks can be used to improve imagery over the case of an uncoded aperture with the same aberration.
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Coded aperture imaging has been used for astronomical applications for several years. Typical implementations used a
fixed mask pattern and are designed to operate in the X-Ray or gamma ray bands. Recently applications have emerged in
the visible and infra red bands for low cost lens-less imaging systems and system studies have shown that considerable
advantages in image resolution may accrue from the use of multiple different images of the same scene - requiring a
reconfigurable mask.
Previously we reported on the realization of a 2x2cm single chip mask in the mid-IR based on polysilicon micro-opto-electro-mechanical systems (MOEMS) technology and its integration with ASIC drive electronics using conventional
wire bonding. The MOEMS architecture employs interference effects to modulate incident light - achieved by tuning a
large array of asymmetric Fabry-Perot optical cavities via an applied voltage and uses a hysteretic row/column scheme
for addressing.
In this paper we present the latest transmission results in the mid-IR band (3-5μm) and report on progress in developing
a scalable architecture based on a tiled approach using multiple 2 x 2cm MOEMS chips with associated control ASICs
integrated using flip chip technology. Initial work has focused on a 2 x 2 tiled array as a stepping stone towards an 8 x 8
array.
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This experiment explores the manufacturability of controllable Micro-electromechanical (MEMS) mirrors to direct
optical signals. Design includes four separate mirrors which independently control vertical displacement,
horizontal displacement, vertical pitch and horizontal pitch. Such devices could be used for a variety of applications
but were specifically intended for future use in communications between optical based circuits residing on
separate chips. Prototype devices were built in PolyMUMPs to test the feasibility of this process for applications
such as this, including a full outgoing beam path with mirror orientations and actuation designs to accomplish
this. Several elements of this outgoing beam path were successful and those which needed improvement indicate
a high probability of success with limited trials needed. Improvement recommendations on currently successful
design elements which could still be improved within the scope of PolyMUMPs have been identified. Originally
intended only to direct the outgoing beam, this design could be used on the incoming path as well. Such a
design would ensure that the receiving device only requires a target location and not that a specific incoming
vector be obtained. This would thus comprise all the elements needed for a prototype proof of concept device to
be built. More sophisticated fabrication processes could provide drastic improvements to both transmission and
reception beam paths and potentially allow for a variety of more sophisticated designs to improve compactness,
controllability, tighten tolerances on moving parts, increase mirror quality, and improved productivity of large
quantities of devices.
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Coded aperture imaging (CAI) has been used in both the astronomical and medical communities for years due to its
ability to image light at short wavelengths and thus replacing conventional lenses. Where CAI is limited, adaptive coded
aperture imaging (ACAI) can recover what is lost. The use of photonic micro-electro-mechanical-systems (MEMS) for
creating adaptive coded apertures has been gaining momentum since 2007. Successful implementation of micro-shutter
technologies would potentially enable the use of adaptive coded aperture imaging and non-imaging systems in current
and future military surveillance and intelligence programs. In this effort, a prototype of MEMS microshutters has been
designed and fabricated onto a 3 mm x 3 mm square of silicon substrate using the PolyMUMPSTM process. This
prototype is a line-drivable array using thin flaps of polysilicon to cover and uncover an 8 x 8 array of 20 μm apertures.
A characterization of the micro-shutters to include mechanical, electrical and optical properties is provided. This
prototype, its actuation scheme, and other designs for individual microshutters have been modeled and studied for
feasibility purposes. In addition, microshutters fabricated from an Al-Au alloy on a quartz wafer were optically tested
and characterized with a 632 nm HeNe laser.
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This paper discusses our investigation into artificial structures called metamaterials. Metamaterials make it
possible to achieve electromagnetic properties not existing in nature. The investigation focuses on the modeling,
fabrication and testing of metamaterials at optical frequencies. The main purpose of this research is to identify a method
to fabricate the artificial structures. We identify limitations in the fabrication process which are used to build the
metamaterials. Measured reflectance data from fabricated devices is then compared with modeled data to identify
limitations affecting the "as-built" figure of merit (FOM). Understanding the parameters which limit the FOM will lead
to device fabrication improvements and ultimately to components suitable for optical applications such as optical
surveillance systems.
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In order to meet the goals of the Department of Defense (DoD) for smaller and more accurate weapons, numerous
projects are currently investigating the miniaturization of weapons and munition fuze components. One of these
efforts is to characterize the performance of small detonators. The velocity of the flyer, the key component
needed to initiate a detonation sequence, can be measured using a photonic Doppler velocimeter (PDV). The
purpose of this research was to develop a microelectromechanical system (MEMS) device that would act as an
optimal retroreflective surface for the PDV. Two MEMS solutions were explored: one using the PolyMUMPsTM
fabrication process and one in-house fabrication design using silicon on insulator (SOI) wafers. The in-house
design consisted of an array of corner reflectors created using an SOI wafer. Each corner reflector consisted of
three separate mirror plates which were self-assembled by photoresist pad hinges. When heated to a critical
temperature (typically 140-160 °C), the photoresist pads melted and the resulting surface tension caused each
mirror to rotate into place. The resulting array of corner reflectors was then coated with a thin layer of gold to
increase reflectivity. Despite the successful assembly of a PolyMUMPsTM corner reflector, assembling an array of
these reflectors was found to be unfeasible. Although the SOI corner reflector design was completed, these devices
were not fabricated in time for testing during this research. However, the bidirectional reflectance distribution
function (BRDF) and optical cross section (OCS) of commercially available retroreflective tapes were measured.
These results can be used as a baseline comparison for future testing of a fabricated SOI corner reflector array.
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In designing optical systems in the EO/IR wavelength region for conventional lens are most common and
efficient when low F# and large field of view is desired. Conventional lenses are efficient in meeting
optical response but come at a cost in size and weight and often are complex in nature (aberrations). In
this paper we discuss alternatives to conventional lenses. We examine diffractive optics (DO), and
explore resonating and diffractive periodic metalo-dielectric structures as an alternative lensing. An
oscillator model is employed to interpret these structures, wavefront bending and a design approach is
provided.
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We report an interferometric detection of an earth-orbiting artificial satellite using optical interferometry. We targeted
four geosynchronous communications satellites with the Navy Prototype Optical Interferometer (NPOI) near Flagstaff,
AZ, and obtained interferometric fringes on one of them, DIRECTV-9S. We used an east-west 15.9-meter baseline of
the NPOI and took data in 16 spectral channels covering the 500-850 nm wavelength range. Observations took place
during the "glint season" of 28 February to 3 March 2008, and then again in February - March 2009, when the geometry
of the solar panel arrays and the Sun's position creates glints as bright as 2nd magnitude of a few minutes' duration each
night. We detected fringes on the satellite at approximately the 2 sigma level on 1 March at magnitude 4.5. Subsequent
analysis shows that the fringe amplitudes are consistent with a size scale of 2 meters (50 nanoradians at GEO) in an east-west
direction. This detection shows that interferometric detection of satellites at visual wavelengths is possible, and
suggests that a multi-baseline interferometer array tailored to the angular size and brightness of geosynchronous
satellites could lead to images of these satellites.
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We report closed-loop results obtained from the first adaptive optics system to deploy multiple laser guide beacons. The
system is mounted on the 6.5 m MMT telescope in Arizona, and is designed to explore advanced altitude-conjugated
techniques for wide-field image compensation. Five beacons are made by Rayleigh scattering of laser beams at 532 nm
integrated over a range from 20 to 29 km by dynamic refocus of the telescope optics. The return light is analyzed by a
unique Shack-Hartmann sensor that places all five beacons on a single detector, with electronic shuttering to implement
the beacon range gate. Wavefront correction is applied with the telescope's unique deformable secondary mirror. The
system has now begun operations as a tool for astronomical science, in a mode in which the boundary-layer turbulence,
close to the telescope, is compensated. Image quality of 0.2-0.3 arc sec is routinely delivered in the near infrared bands
from 1.2-2.5 μm over a field of view of 2 arc min. Although it does not reach the diffraction limit, this represents a 3 to
4-fold improvement in resolution over the natural seeing, and a field of view an order of magnitude larger than
conventional adaptive optics systems deliver. We present performance metrics including images of the core of the
globular cluster M3 where correction is almost uniform across the full field. We describe plans underway to develop the
technology further on the twin 8.4 m Large Binocular Telescope and the future 25 m Giant Magellan Telescope.
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Current optical phased arrays produce images by adaptively phasing the output of several telescopes on a common focal
plane. Image based phasing techniques such as Phase Diversity, are used to maintain the phasing in real time. This
requires both a computationally intensive algorithm for estimating the phasing errors as well as a means for rapidly
adjusting the optical path length through each telescope. In this paper we will compare the adaptive technique of phasing
multiple telescopes with the analytic technique of digital holography. Digital holography provides a means of digitally
estimating and correcting the phasing errors between the multiple telescopes. The process can occur long after the data
has been acquired which relaxes the requirements on the stability of the phased array as well as the mechanical
complexity. Experimental results will be shown for adaptive and analytical image formation in remote sensing
applications.
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Conventional wavefront correction uses direct wavefront sensing methods such as the Shack-Hartmann sensor to
measure the wavefront at the pupil of the system. Image sharpening is an indirect wavefront sensing method where the
wavefront correction is performed using measurements from the image plane. Wavefront correction using image
sharpening is advantageous in systems where a point source isn't available or where the number of optical components
needs to be reduced by using the scientific camera that is already in place. Correction is performed by measuring the
sharpness value as the correction device, such as a deformable mirror, cycles through until the sharpness value is
maximized and continues to adapt as the aberrations change. A sharpness metric, or definition, is needed to measure the
sharpness value such that it reaches a maximum when aberrations are minimized. This work investigates the use of the
Fourier transform of the image, the image spatial frequency spectra, as a Fourier-based sharpness metric. The image
spatial frequency spectra is obtained two ways, digitally by computing the Fourier transform of the image plane and
optically with a coherent source by using the Fourier transform properties of a convex lens. Affects of aberrations on the
intensity at various spatial frequencies are investigated to obtain a sharpness metric that reaches a maximum and
aberration strengths decrease. Results from experimentation of various optical configurations are presented to evaluate
the performance of these Fourier-based metrics.
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Active optical imaging is preferred over Radio Frequency (RF) counterparts due to its higher resolution, faster area
search rate, and relatively easier interpretation by a human observer. However, in imaging through atmosphere one
should consider dispersive effects of multiple scatterings and turbulence-induced wave perturbations, which give rise to
intensity fluctuations, and wave-front distortions. All these phenomena broaden and distort the spatial impulse response
known as the Point Spread Function (PSF). In this paper, a multiplexed Multi-Input Multi-Output (MIMO) imaging
system design is introduced. At the transmitter, a computer generated holographic beam-splitter is used to generate
arrays of beamlets, providing faster area search rate and a uniformly distributed illumination all over the target. Then at
the receiver, an array of photo-detectors is used to collect the reflected rays. While a Monte-Carlo Ray Tracing (MCRT)
algorithm, developed at Pennsylvania State University, Center for Information and Communications Research (CICTR),
is used to model imaging in multiple scattering turbid media, phase-screens are employed to simulate turbulence-induced
wave-front distortions. Hence, a comprehensive frame work is exploited that takes into account possible sources of
degradation. Using this frame of work, system performance is analyzed under different meteorological conditions and
restoration techniques such as Blind Deconvolution (BD) are used to retrieve the original image by deconvolving PSF
and observed image.
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Experimental demonstrations of optical synthetic aperture imaging using spatial heterodyne interferometry have been
achieved at the Lockheed Martin Advanced Technology Center in Palo Alto, CA. In laboratory experiments, a reflective
binary star scene and an Air Force resolution bar target were illuminated and imaged by a 532 nm laser and an afocal
telescope. The real aperture diffraction limit in the horizontal direction was 65 microRadians. Complex pupil
information was obtained by mixing the scattered return light from the target with light from an off-axis local oscillator,
thus forming a linear fringe pattern on a CCD array placed at the pupil plane. Fourier transform methods were used to
extract pupil amplitude and phase. By translating the real aperture pupil, collecting data at different locations, and
extracting and combining the pupil data, a synthetic aperture twice the real aperture size was created. In the
reconstructed image resulting from the synthetic aperture pupil data, features down to 32 microRadians were clearly
resolved.
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In this paper, the azimuth imaging resolutions of synthetic aperture imaging ladar (SAIL) using the antenna telescopes
with a circular aperture for reception and a circular plan or a Gaussian beam for transmitting and with a rectangular
aperture for reception and a rectangular plane or an elliptic Gaussian beam for transmitting are investigated. The analytic
expressions of impulse response for imaging are achieved. The ideal azimuth spot of resolution and its degradation due
to the target deviation from the footprint center, the mismatch from the quadratic phase matched filtering, the finite
sampling rate and width are discussed. And the range resolution is also studied. Mathematical criteria are all given. As a
conclusion, the telescope of rectangular aperture can provide a rectangular footprint more suitable for the SAIL scanning
format, and an optimal design of aperture is thus possible for both a high resolution and a wide scan strip. Moreover, an
explanation to the resulted azimuth resolution from our laboratory-scaled SAIL is given to verify the developed theory.
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A fully 2-D synthetic aperture imaging ladar (SAIL) demonstrator is designed and being fabricated to experimentally
investigate and theoretically analyze the beam diffraction properties, antenna function, imaging resolution and signal
processing algorithm of SAIL. The design details of the multi-purpose SAIL demonstrator are given and, as the first
phase, a laboratory-scaled SAIL system based on bulk optical elements has been built to verify the principle of design,
which is similar in construction to the demonstrator but without the major antenna telescope. The system has the aperture
diameter of about 1mm and the target distance of 3.2m.
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The advantages of terahertz (THz) imaging are well known. They penetrate well most
non-conducting media and there are no known biological hazards, This makes such
imaging systems important for homeland security, as they can be used to image
concealed objects and often into rooms or buildings from the outside. There are also
biomedical applications that are arising. Unfortunately, THz imaging is quite
expensive, especially for real time systems, largely because of the price of the
detector. Bolometers and pyroelectric detectors can each easily cost at least hundreds
of dollars if not more, thus making focal plane arrays of them quite expensive.
We have found that common miniature commercial neon indicator lamps costing
typically about 30 cents each exhibit high sensitivity to THz radiation [1-3], with
microsecond order rise times, thus making them excellent candidates for such focal
plane arrays. NEP is on the order of 10-10 W/Hz1/2. Significant improvement of
detection performance is expected when heterodyne detection is used
Efforts are being made to develop focal plane array imagers using such devices at 300
GHz. Indeed, preliminary images using 4x4 arrays have already been obtained. An
8x8 VLSI board has been developed and is presently being tested. Since no similar
imaging systems have been developed previously, there are many new problems to be
solved with such a novel and unconventional imaging system.
These devices act as square law detectors, with detected signal proportional to THz
power. This allows them to act as mixers in heterodyne detection, thus allowing NEP
to be reduced further by almost two orders of magnitude.
Plans are to expand the arrays to larger sizes, and to employ super resolution
techniques to improve image quality beyond that ordinarily obtainable at THz
frequencies.
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