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

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.

Citation Download Citation

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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