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Trace gas sensing and analysis by tunable diode laser absorption spectroscopy (TDLAS) has become a robust and reliable technology accepted for industrial process monitoring and control, quality assurance, environmental sensing, plant safety, and infrastructure security. Sensors incorporating well-packaged wavelength-stabilized near-IR (1.2-2.0 ??m) laser sources sense over a dozen toxic or industrially-important...
Detection of ethane in breath will enable non-invasive monitoring of oxidative stress status. We present ethane absorption measurements using wavelength modulation spectroscopy and show that concentrations below 1 ppb can be detected with cavity enhancement.
The potential for extended-range remote sensing of methane is examined, utilizing a fiber-amplified source. Details of WMS absorption signal characteristics and output laser characteristics are presented for an EDFA-amplified tunable DFB diode laser.
We describe a standoff sensor for monitoring, from above 3,000 m, the natural gas transmission pipeline infrastructure. Using an EDFA, the sensor amplifies the tunable diode laser beam from a Wavelength Modulation Spectroscopy platform.
Abstract. A handheld, battery-powered tunable-diode-laser sensor platform is described. The sensor is based on frequency modulation (FM) spectroscopy using near-IR diode lasers and passive topographic backscatter from common environmental targets such as buildings, ground and foliage. A specific application to the detection of methane using a 1.65-micron diode laser is described in detail, showing...
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