Hyperspectral LiDAR using supercontinuum laser as light source, applying spectroscopic technology gets backscattered reflectance of different wavelengths, and can acquire both the geometry and spectral information on the target. Due to the development of the photoelectric sensor, hyperspectral LiDAR has fewer spectral channels, which limits its application in physical properties detection. To solve this problem, this paper proposes a new method based on the micro mirror array. By blaze grating, the supercontinuum laser is grating into monochromatic light in space, first projected to the micro mirror array, by controlling the micro mirror array flip, specific spectrum and reflection to corresponding photoelectric sensor channels, improve the spectral resolution. The micro mirror array photoelectric sensor resolution is much higher than the number of channels, through this method, can greatly improve the spectral resolution. In this paper, based on the micro mirror array, the simulation design is carried out and the feasibility of the method is verified by experiments. The simulation and experimental results show that the spectral resolution can be improved greatly by controlling the turning of the micro mirror.
A 3D laser imaging test facility was developed and established using a module design approach. The test facility
provides a complete, controllable and repeatable experiment environment, and supports research and simulation of 3Dimaging
LiDAR system. The test facility consists of five major parts: an open 3D-imaging LiDAR, a target simulator, a
far-field emulation, a background light environment simulation system, and a large FOV stereo vision system. The test
facility has been set three working modes: unit module analysis mode, accuracy and imaging mechanism of LiDAR
system mode, moving target detecting and environmental modeling mode. The open test facility continually evolves to
meet the expanding role of 3D laser imaging applications.
Blade tip timing is a non-intrusive technique used for detection, measurement and analysis of blade vibration in rotating
blade assemblies. The main recent focus in the application of blade tip timing system has been the determination of blade
vibration frequencies. Although the fundamentals of the technique are fully developed, the analysis of data obtained in
the presence of simultaneous excitation response is problematic. A number of methods have been introduced for the
analysis of blade tip timing data from assemblies undergoing synchronous excitation or asynchronous vibration, each of
them has its inherent limitation in practice. The approaches to the analysis of blade tip timing data were presented with
its theoretical principle and application requirement. Several of the techniques were found to perform effectively on
asynchronous resonances or synchronous resonances, with accurate vibration frequency estimates yielded.
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