Development of a pulsed backscatter-absorption gas-imaging system and its application to the visualization of natural gas leaks
- Sandia National Laboratories, MS 9051, P. O. Box 969, Livermore, California 94551-0969 (United States)
The design and evaluation of a backscatter-absorption gas-imaging sensor that operates in a pulsed mode is described. It is capable of video visualization of natural gas leaks. Its development was motivated by the need for a methane imaging system to operate at ranges and sensitivities useful to the natural gas industry. The imager employs pulsed laser illumination at a repetition rate of 30 Hz and an average power of {approximately}150 mW to image gas at standoff ranges of as long as 100 m, using a backscatter target with a reflectivity of 0.016 sr{sup {minus}1}. This is a tenfold improvement over an earlier raster-scanned imager. Natural gas leaks as small as 1.6{times}10{sup {minus}4} standard liters/s [equal to 0.02 standard cubic feet per hour (scfh)] were imaged at short ranges; leaks as low as 7.9{times}10{sup {minus}4} standard liters/s (0.1 scfh) were observed at long ranges. Data are compared with model predictions, and potential extensions to a fieldable prototype are discussed. The optimization of a direct-injection focal-plane array for detecting short (nanosecond) laser pulses is described. {copyright} 1998 Optical Society of America
- OSTI ID:
- 641495
- Journal Information:
- Applied Optics, Vol. 37, Issue 18; Other Information: PBD: Jun 1998
- Country of Publication:
- United States
- Language:
- English
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