Preventing the saturation phenomenon of detectors used in environmental remote sensing

Abdelkrim Kedadra; Mohammed Traïche

doi:10.1117/12.2195201

16 October 2015 Preventing the saturation phenomenon of detectors used in environmental remote sensing

Proceedings Volume 9640, Remote Sensing of Clouds and the Atmosphere XX; 96400B (2015) https://doi.org/10.1117/12.2195201
Event: SPIE Remote Sensing, 2015, Toulouse, France

Abstract

The nowadays environmental issues motivated us to develop a mobile LiDAR system for two applications: 1°/ the prevention against forest fires in the hilly and inaccessible continuous mountainous forests in north Algeria, where the risk factor of a forest fire is high in summer and 2°/ the study of the atmosphere by monitoring pollutant species and sand aerosols emanating either from cement plants in the Algiers agglomeration and the Sahara. The system mobility enables measurements in different locations. For the first application, we use an eye safe laser wavelength at λ=1.57 μm and an avalanche photodiode (APD) as a detector. For the second application, we use an Nd:YAG laser followed by a second harmonic generator that emits at λ=532 nm and a photomultiplier (PMT) as a detector. The LiDAR is an active technique that often deals with weak return signals. The latter come with an intensity proportional to 1⁄R², where R is the range from the target to the detector. The signal-to-noise ratio (SNR), as an effective detection criterion, needs to be optimized towards better performance. That is, when the SNR is low, the detected signal is increased and vice versa. In the case of forest fires detection, it may happen that strong signals from nearest objects lead the detector to a saturation status. We suggest a method to handle this issue that is base on the control of the detector gain by driving its applied voltage.

Citation Download Citation

Abdelkrim Kedadra and Mohammed Traïche "Preventing the saturation phenomenon of detectors used in environmental remote sensing", Proc. SPIE 9640, Remote Sensing of Clouds and the Atmosphere XX, 96400B (16 October 2015); https://doi.org/10.1117/12.2195201

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
17 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Signal to noise ratio

Sensors

Signal detection

LIDAR

Avalanche photodetectors

Remote sensing

Interference (communication)

Show All Keywords

Keywords/Phrases

Search In:

Publication Years