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Title: Sensitive detection of formaldehyde using an interband cascade laser near 3.6 μm

Journal Article · · Sensors and Actuators. B, Chemical
 [1];  [2];  [2]
  1. Chinese Univ. of Hong Kong (China). Dept. of Mechanical and Automation Engineering; The Chinese University of Hong Kong, Department of Mechanical and Automation Engineering
  2. 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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