Mobile SO2 and NO2 DIAL Lidar system for enforcement use

David Lloyd Cunningham; William H. Pence; Stephen E. Moody

doi:10.1117/12.177304

3 June 1994 Mobile SO₂ and NO₂ DIAL Lidar system for enforcement use

David Lloyd Cunningham, William H. Pence, Stephen E. Moody

Author Affiliations +

Proceedings Volume 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements; (1994) https://doi.org/10.1117/12.177304
Event: SPIE's International Symposium on Optical Sensing for Environmental Monitoring, 1993, Atlanta, GA, United States

Abstract

A self-contained mobile differential absorption lidar (DIAL) system intended for measuring SO₂ and NO₂ concentrations from stationary combustion sources has been completed for enforcement use. The system uses tunable Ti:sapphire laser technology, with nonlinear conversion to the blue and UV absorption wavelengths. Separate tunable laser oscillators at slightly offset wavelengths are pumped on alternate pulses of a 20 Hz doubled Nd:YAG pump laser; the outputs are amplified in a common amplifier, doubled or tripled, and transmitted toward a target region via a two-mirror beam director. Scattered atmospheric returns are collected in a 0.27-m-diameter telescope, detected with a filtered photomultiplier, and digitized and stored for analysis. Extensive software-based control and display windows are provided for operator interaction with the system. The DIAL system is built into a small motor coach. Gasoline- powered electrical generation, laser cooling, and air conditioning services are present. Separate computers are provided for simultaneous data collection and data analysis activities, with shared data base access. A laser printer supplies hardcopy output. The system includes the capability for automatic data collection at a series of scanner angles, and computer processing to present results in a variety of formats. Plumes from coal-fired and mixed-fuel-fired combusters have been examined for NO₂ and SO₂ content. Noise levels of a few parts per million are reached with averaging times of less than one minute.

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David Lloyd Cunningham, William H. Pence, and Stephen E. Moody "Mobile SO₂ and NO₂ DIAL Lidar system for enforcement use", Proc. SPIE 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements, (3 June 1994); https://doi.org/10.1117/12.177304

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