Ppb-level formaldehyde detection using a CW room-temperature interband cascade laser and a miniature dense pattern multipass gas cell
- Rice Univ., Houston, TX (United States). Dept. of Electrical and Computer Engineering; Shanxi Univ., Taiyuan (China). State Key Lab. of Quantum Optics and Quantum Optics Devices, Inst. of Laser Spectroscopy; Maxion Technologies
- Rice Univ., Houston, TX (United States). Dept. of Electrical and Computer Engineering
- Sentinel Photonics, Monmouth Junction, NJ (United States)
A ppb-level formaldehyde (H2CO) sensor was developed using a thermoelectrically cooled (TEC), continuous-wave (CW) room temperature interband cascade laser (ICL) emitting at 3.59 μm and a miniature dense pattern multipass gas cell with >50 m optical path length. Performance of the sensor was investigated with two measurement schemes: direct absorption (DAS) and wavelength modulation spectroscopy (WMS). With an integration time of less than 1.5 second, a detection limit of ~3 ppbv for H2CO measurement with precision of 1.25 ppbv for DAS and 0.58 ppbv for WMS, respectively, was achieved without zero air based background subtraction. An Allan-Werle variance analysis indicated that the precisions can be further improved to 0.26 ppbv @ 300s for DAS and 69 pptv @ 90 s for WMS, respectively. Finally, a side-by-side comparison between two measurement schemes is also discussed in detail.
- Research Organization:
- Rice Univ., Houston, TX (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E); National Science Foundation (NSF); National Natural Science Foundation of China (NNSFC); Robert Welch Foundation
- Grant/Contract Number:
- AR0000538
- OSTI ID:
- 1435053
- Report Number(s):
- DOE-MAXION--00538-10
- Journal Information:
- Optics Express, Journal Name: Optics Express Journal Issue: 15 Vol. 23; ISSN 1094-4087; ISSN OPEXFF
- Publisher:
- Optical Society of America (OSA)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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