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Proceedings Paper

Effects of the atmosphere on image quality in the imaging lidar system
Author(s): B. Presennakumar; Anoop Kumar S.; D. Ramakrishna Rao; S. Muraleedharen Nair; Mohankumar Santhibhavan Vasudevanpillai; S. Veerabuthiran; M. Satyanarayana
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Paper Abstract

Lidar techniques are based on the interaction of the laser beam with various constituents of the atmosphere like aerosols, gas molecules etc. Various atmospheric conditions like temperature turbulence, refractive index variation, fog, rain etc. really influence the transmission properties of the laser beam. An Imaging Lidar provides a 3-D Image of the targets like clouds when used vertically up in the atmosphere or any terrestrial object on the ground when used horizontally. Various image processing techniques are used to improve the image quality by using various mathematical models related to atmospheric conditions. A portable IR Imaging lidar system has been designed and developed for imaging the terrestrial targets during nighttime in complete dark conditions. The system is also being used for study of the structure of clouds in the troposphere. The system mainly consists of a CW laser source operating in the IR region and a CCD array-imaging device with zooming capability to cover the long range. The CCIR standard video output available from the CCD camera is monitored by a high resolution monochrome monitor. The video output is digitized using a frame grabber board. The digitized image is subjected to online and offline processing methods. The image signal depends on the integral response of the laser source, reflection/scattering properties of the objects, atmospheric effects etc. Based on the image processing methods needed to improve the quality of image under different atmospheric conditions, known a priori, an empirical model is developed. This paper describes the imaging lidar system developed and the image processing.

Paper Details

Date Published: 12 December 2006
PDF: 11 pages
Proc. SPIE 6409, Lidar Remote Sensing for Environmental Monitoring VII, 64090X (12 December 2006); doi: 10.1117/12.694584
Show Author Affiliations
B. Presennakumar, ISRO Vikram Sarabhai Space Ctr. (India)
Anoop Kumar S., Univ. of Kerala (India)
D. Ramakrishna Rao, ISRO Vikram Sarabhai Space Ctr. (India)
S. Muraleedharen Nair, ISRO Vikram Sarabhai Space Ctr. (India)
Mohankumar Santhibhavan Vasudevanpillai, ISRO Vikram Sarabhai Space Ctr. (India)
S. Veerabuthiran, ISRO Vikram Sarabhai Space Ctr. (India)
M. Satyanarayana, ISRO Vikram Sarabhai Space Ctr. (India)

Published in SPIE Proceedings Vol. 6409:
Lidar Remote Sensing for Environmental Monitoring VII
Upendra N. Singh; Toshikazu Itabe; D. Narayana Rao, Editor(s)

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