Single image spectroscopy using a grating spectrometer and a broadband IR laser source

Christopher A. Kendziora; Tyler J. Huffman

doi:10.1117/12.3013896

7 June 2024 Single image spectroscopy using a grating spectrometer and a broadband IR laser source

Christopher A. Kendziora, Tyler J. Huffman

Proceedings Volume 13056, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXV; 130560X (2024) https://doi.org/10.1117/12.3013896
Event: SPIE Defense + Commercial Sensing, 2024, National Harbor, Maryland, United States

Abstract

We present recent results from using a quantum cascade laser as a broadband infrared source for real-time spectroscopy. Using a Fabry-Perot quantum cascade laser (FP-QCL), we illuminate samples with broadband IR light from 8.2 μm to 10.2 μm. This laser source and its operating conditions (25°C and 500 ns pulses at 200 kHz repetition rate) were chosen to give broad spectral coverage and high power output (42.7 mW average power, pulsed operation). We utilized a simple grating spectrometer together with a high resolution (1280 x 1024 pixel) micro-bolometer focal plane array to capture each full spectrum in a single frame. Several samples were characterized using this apparatus in a transmission-style measurement and their real-time spectra were compared to their Fourier Transform Infrared (FTIR) spectra. The results show a good agreement between FTIR and the real-time grating spectrometer for several representative samples, including bandpass filters, and IR active materials such as polystyrene, polyester, and polypropylene. Finally, we show the real-time benefit of this approach by measuring a moving target foil on a rotating chopper wheel.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Christopher A. Kendziora and Tyler J. Huffman "Single image spectroscopy using a grating spectrometer and a broadband IR laser source", Proc. SPIE 13056, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXV, 130560X (7 June 2024); https://doi.org/10.1117/12.3013896

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