Remote mid IR Photoacoustic Spectroscopy for the detection of explosive materials

被引：2
|
作者：
Mann, Mohit [1 ,2 ]
Rao, A. S. [2 ]
Sharma, Ramesh C. [1 ]
机构：
[1] DRDO, Laser Sci & Technol Ctr, Delhi 110054, India
[2] Delhi Technol Univ, Dept Appl Phys, Bawana Rd, Delhi 110042, India
来源：
CHEMICAL PHYSICS LETTERS | 2021年 / 765卷
关键词：
Tunable quantum cascade laser; Ultrasonic detector; Resonator cavity; Photoacoustic spectroscopy; Parabolic reflector; TRACE DETECTION;
D O I：
10.1016/j.cplett.2020.138231
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Standoff photoacoustic detection of explosives using quantum cascade laser has been studied. The laser beam has been focused on to the target molecules adsorbed on metallic surfaces. A 25 kHz microphone, a resonator cavity in form of a cylinder, and a parabolic acoustic reflector have been used to demonstrate the method. The experimental results have been compared with the theoretical calculations in three different experimental conditions. The photoacoustic signals have been found to decrease with increase in the standoff range. The sensitivity of 2.0 mu g/cm(2) has been achieved at similar to 4.0 m.
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页数：5
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