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Title: Doppler technique for detection of victims buried under earthquake rubble
Authors: Banerjee, P K
Sengupta, A
Keywords: Doppler technique;Earthquake
Issue Date: Dec-2003
Publisher: NISCAIR-CSIR, India
Abstract: Design and development of an electronic remote victim locator* is described in this paper. It has been designed for locating re motely, any animate subject buried under rubble or behind a barrier. It works on the principle of Doppler effect at microwave frequencies. Electromagnetic signal travel s down the debris from a transmit/receive antenna, illuminates the animate subject under the rubble and returns to the top of the debris having phase modulated with body movements. The antenna picks up the phase-modulated signal , which is processed by a microwave phase synchronous receiver. The detected signal is displayed on an oscilloscope or any other suitable display device. The display is either a regular breathing cycle or any sudden shift in its steady level, resulting from even a slight movement of any part of the body. An important part of the system is the clutter (unwanted reflections) canceller. Presently, the system can penetrate a dry concrete debris depth of about 2 m. Detection depth may be greater if there are more air voids in the debris. Efforts are on to improve the depth of penetration in the rubble. The same system can detect presence of any person behind a barrier, which has security applications.
Page(s): 970-974
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.41(12) [December 2003]

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