Open AccessDesign and Testing a Remote Laser Listening System
Author(s) -
Kasim M. Al-hity,
Albashir Zomrawi Mohamed Yousif
Publication year - 2009
Language(s) - English
Resource type - Journals
ISSN - 1858-7313
DOI - 10.52981/fjes.v4i1.45
Subject(s) - detector , computer science , laser , active listening , signal (programming language) , position (finance) , reflector (photography) , remote sensing , acoustics , telecommunications , optics , physics , light source , geography , communication , economics , programming language , finance , sociology
Laser listening device is one the modern and powerful techniques in the field of remote sensing. In this research a simple system was developed to remote sensing the audio signals. The reflected laser spot position variation is dependent on the variation in the reflector position. A suitable receiver was designed for receiving and demodulating the audio signal. Light dependence resistance (LDR) was used in the receiver as an optical detector and it was tested in three cases. This system was tested to remote sensing the audio signals up to 5m and it is easy to increase this distance. The results of this research are promising and one can conclude that this system can be used efficiently to sense the microvibrations, but with a careful alignment.