3 May 2017 Photo-vibrational sensing of trace chemicals and explosives by long-distance differential laser Doppler vibrometer
Author Affiliations +
Photoacoustic/photothermal spectroscopy is an established technique for trace detection of chemicals and explosives. Normally high-sensitive microphone or PZT sensor is used to detect the signal in photoacoustic cell. In recent years, laser Doppler vibrometer (LDV) is proposed to remote-sense photoacoustic signal on various substrates. It is a highsensitivity sensor with a displacement resolution of <10pm. In this research, the photoacoustic effect of various chemicals and explosives is excited by a quantum cascade laser (QCL) at their absorbance peak. A home-developed differential LDV at 1550nm wavelength is applied to detect the vibration signal at 100m. A differential configuration is applied to minimize the environment factors, such as environment noise and vibration, air turbulence, etc. and increase the detection sensitivity. The photo-vibrational signal of chemicals and explosives on different substrates are detected. The results show the potential of the proposed technique on detection of trace chemicals and explosives at long standoff distance.
Conference Presentation
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Yu Fu, Yu Fu, Huan Liu, Huan Liu, Qi Hu, Qi Hu, Jiecheng Xie, Jiecheng Xie, } "Photo-vibrational sensing of trace chemicals and explosives by long-distance differential laser Doppler vibrometer", Proc. SPIE 10183, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVIII, 101830B (3 May 2017); doi: 10.1117/12.2261783; https://doi.org/10.1117/12.2261783

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