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  • Measuring Optical Decay Time
Jun 2008
Picarro Inc.Request Info
SUNNYVALE, Calif., June 4, 2008 – Picarro, Inc. said its new G1104 H2S analyzer for monitoring trace levels of H2S (hydrogen sulfide) in ambient air, has a lower detection limit of 1 ppbv (parts per billion), which is an order of magnitude lower than earlier models.

With Picarro’s WS-CRDS (wavelength-scanned cavity ring down spectroscopy) technology, the new analyzer provides a large dynamic range of up to 300 ppmv (parts per million), operates in real time and has no requirement for frequent calibration. According to Picarro, the G1104 H2S will not suffer from cross-talk due to changes in other ambient gas components such as trace sulfur compounds and variations in moisture and CO2 at atmospheric levels. Picarro-H2S-Analyzer.jpg

Using an internal laser beam with an effective path length of many kilometers, the WS-CRDS is an ultrasensitive technology that measures the optical decay time in a flow cell. This technique enables the concentration of a particular species to be measured with sensitivity and precision several orders of magnitude higher than by any other optical technique. 

The H2S analyzer achieves its precision and accuracy by way of incorporating improved temperature control of the internal optical components. 

Specific applications for Picarro’s G1104 H2S include petrochemical plant emissions, in stacks, flares and flues, as well as emissions from landfills, sewage treatment plants and wastewater facilities.

For more information, visit:

Picarro Inc.
480 Oakmead Parkway
Sunnyvale, Calif., 94085
Phone: (408) 962-3900
Fax: (408) 962-3200




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The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
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