Chemical agent detection and identification with a hyperspectral imaging infrared sensor

Abstract

Standoff detection, identification and quantification of chemical agents are fundamental needs in several fields of applications. Additional required sensor characteristics include high sensitivity, low false alarms and high-speed (ideally real-time) operation, all in a compact and robust package. The thermal infrared portion of the electromagnetic spectrum has been utilized to implement such chemical sensors, either with spectrometers (with none or moderate imaging capability) or with imagers (with moderate spectral capability). Only with the recent emergence of high-speed, large format infrared imaging arrays, has it been possible to design chemical sensors offering uncompromising performance in the spectral, spatial, as well as the temporal domain.Telops has developed an innovative instrument that can not only provide an early warning for chemical agents and toxic chemicals, but also one that provides a "Chemical Map" in the field of view. To provide to best field imaging spectroscopy instrument, Telops has developed the FIRST, Field-portable Imaging Radiometric Spectrometer Technology, instrument. This instrument is based on a modular design that includes: a high-performance infrared FPA and data acquisition electronics, onboard data processing electronics, a high-performance Fourier transform modulator, dual integrated radiometric calibration targets and a visible boresight camera. These modules, assembled together in an environmentally robust structure, used in combination with Telops' proven radiometric and spectral calibration algorithms make this instrument a world-class passive standoff detection system for chemical imaging. This paper presents chemical detection and identification results obtained with the FIRST sensor.

Infrared Imaging Fourier Transform Spectrometer as the Stand-Off Gas Detection System

“…Finally, results are presented to demonstrate the capabilities and the performances of the remote gas quantification by using hyperspectral data obtained from the Telops HyperCam spectrometer. The latter is described in much detail in the references [9][10][11][12].…”

“…First, the apparent temperature is estimated using (13). From this estimate, the Planck's blackbody radiation curve is generated according to (9). The pixel value is divided by its blackbody radiation estimate to obtain (18).…”

Outdoor Applications of Hyperspectral Imaging Technology for Monitoring Agricultural Crops: A Review

“…HSI with remote sensing is better than MSI and demonstrates versatility for a variety of crop monitoring applications (Hunt et al, 1989;Blackburn, 1998;Champagne et al, 2003;Zhu et al, 2006;Wang et al, 2008;Prabhakar et al, 2011;Ranjan et al, 2012;Pradhan et al, 2014;Mahajan et al, 2014;Prasannakumar et al, 2014). HSI has already proven to be very effective in defense, agricultural research, and environmental applications (Lu and Chen, 1999;Ustin et al, 2004;Farley et al, 2007).…”

Standoff gas detection, identification and quantification with a thermal hyperspectral imager

“…Hyper-Cams have been used many times for the standoff detection, identification, imaging and quantification of gas clouds [1]. Before presenting some experimental results, we explain the theory of standoff gas detection with this type of sensor.…”