Backscatter absorption gas imaging: a new technique for gas visualization
- Formerly with Lawrence Livermore National Laboratory, Livermore, California 94550 now with Laser Imaging Systems, Punta Gorda, Florida 33983 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
This paper presents a new laser-based method of gas detection that permits real-time television images of gases to be produced. The principle of this technique [which is called backscatter absorption gas imaging (BAGI)] and the operation of two instruments used to implement it are described. These instruments use 5-W and 20-W CO[sub 2] lasers to achieve gas imaging at ranges of approximately 30 and 125 m, respectively. Derivations of relevant BAGI signal equations that can be used to predict the performance of a gas imager are provided. The predictions of this model and the measured range performance of an extended-range gas imager are compared. Finally, the results of gas sensitivity measurements and imaging tests on flowing gases are presented. These can be used to generate a realistic estimate of the BAGI sensitivity expected in detecting leaks of many different vapors.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6236943
- Journal Information:
- Applied Optics; (United States), Vol. 32:21; ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
47 OTHER INSTRUMENTATION
GASES
DETECTION
IMAGES
LEAK DETECTORS
SENSITIVITY
BACKSCATTERING
CARBON DIOXIDE LASERS
PLUMES
REMOTE SENSING
FLUIDS
GAS LASERS
LASERS
SCATTERING
400102* - Chemical & Spectral Procedures
440600 - Optical Instrumentation- (1990-)