Use of external cavity quantum cascade laser compliance voltage in real-time trace gas sensing of multiple chemicals

Mark C. Phillips; Matthew S. Taubman; Jason Kriesel

doi:10.1117/12.2080852

8 February 2015 Use of external cavity quantum cascade laser compliance voltage in real-time trace gas sensing of multiple chemicals

Mark C. Phillips, Matthew S. Taubman, Jason Kriesel

Author Affiliations +

Proceedings Volume 9370, Quantum Sensing and Nanophotonic Devices XII; 93700Z (2015) https://doi.org/10.1117/12.2080852
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

We describe a prototype trace gas sensor designed for real-time detection of multiple chemicals. The sensor uses an external cavity quantum cascade laser (ECQCL) swept over its tuning range of 940-1075 cm^-1(9.30-10.7 μm) at a 10 Hz repetition rate. The sensor was designed for operation in multiple modes, including gas sensing within a multi-pass Heriott cell and intracavity absorption sensing using the ECQCL compliance voltage. In addition, the ECQCL compliance voltage was used to reduce effects of long-term drifts in the ECQCL output power. The sensor was characterized for noise, drift, and detection of chemicals including ammonia, methanol, ethanol, isopropanol, Freon- 134a, Freon-152a, and diisopropyl methylphosphonate (DIMP). We also present use of the sensor for mobile detection of ammonia downwind of cattle facilities, in which concentrations were recorded at 1-s intervals.

Citation Download Citation

Mark C. Phillips, Matthew S. Taubman, and Jason Kriesel "Use of external cavity quantum cascade laser compliance voltage in real-time trace gas sensing of multiple chemicals", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93700Z (8 February 2015); https://doi.org/10.1117/12.2080852

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