Standoff Detection and Identification of Liquid Chemicals on a Reflective Substrate Using a Wavelength-Tunable Quantum Cascade Laser

Sensors

Jongwon Lee¹  Jeongwoo Son¹  Seongjin Park¹  Jaeyeon Yu¹ 

[1] Department of Electrical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea;

关键词: chemical detection;    quantum cascade laser;    mid-IR laser absorption spectroscopy;    standoff detection;    diffuse reflectance spectroscopy;   

DOI  :  10.3390/s22093172

来源: DOAJ

【 摘 要 】

Standoff chemical detection and identification techniques are necessary for ensuring safe exposure to dangerous substances. Molecular fingerprints of unknown chemicals can be measured using wavelength-tunable quantum cascade lasers operating in long-wavelength infrared. In this work, we present a method that can identify liquid chemicals on a reflective substrate via diffuse reflection spectra measurement from 50 cm away and multiple nonlinear regression analysis. Experimental measurements and numerical analyses were conducted for different chemical surface densities and angles of light incidence using diethyl phthalate (DEP) and dimethyl methylphosphonate (DMMP). Candidate substances can be classified using a deep learning model to reduce analysis time.

【 授权许可】

Unknown