Sensitive detection of formaldehyde using an interband cascade laser near 3.6 μm
- Chinese Univ. of Hong Kong (China). Dept. of Mechanical and Automation Engineering; The Chinese University of Hong Kong, Department of Mechanical and Automation Engineering
- Rice Univ., Houston, TX (United States). Dept. of Electrical and Computer Engineering
Here, we report the development of a formaldehyde (H2CO) trace gas sensor using a continuous wave (CW), thermoelectrically-cooled (TEC), distributed-feedback interband cascade laser (DFB-ICL) at 3.6 μm. Wavelength modulation spectroscopy was used to detect the second harmonic spectra of a strong H2CO absorption feature centered at 2778.5 cm-1 (3599 nm) in its ν1 fundamental vibrational band. A compact and novel multipass cell (7.6-cm physical length and 32-ml sampling volume) was implemented to achieve an effective optical path length of 3.75 m. A minimum detection limit of 6 parts per billion (ppb) at an optimum gas pressure of 200 Torr was achieved with a 1-s data acquisition time. An Allan-Werle deviation analysis was performed to investigate the long-term stability of the sensor system and a 1.5 ppb minimum detectable concentration could be achieved by averaging up to 140 s. Absorption interference eeffects from atmospheric H2O (2%) and CH4(5 ppm) were also analyzed in this work and proved to be insignificant for the current sensor configuration.
- Research Organization:
- Rice Univ., Houston, TX (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E); National Science Foundation (NSF); French National Research Agency (ANR); Robert Welch Foundation; Direct Grant for Research (China); Chinese Univ. of Hong Kong (China)
- Grant/Contract Number:
- AR0000538
- OSTI ID:
- 1435803
- Report Number(s):
- DOE-MAXION--00538-15; PII: S0925400515301350
- Journal Information:
- Sensors and Actuators. B, Chemical, Journal Name: Sensors and Actuators. B, Chemical Journal Issue: C Vol. 221; ISSN 0925-4005
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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