Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means
Patent
1987-04-29
1989-08-01
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Ultraviolet light responsive means
2503385, 356 51, 356416, G01N 2133
Patent
active
048535435
ABSTRACT:
A method and apparatus for airborne prospecting for base and precious metal deposits, petroleum and natural gas deposits, geothermal steam deposits, and leaks in natural gas pipelines. A trace gas associated with the deposits in the near-surface atmosphere is detected with a differential absorption optical technique utilizing only a single laser beam to perform remote differential optical measurement. Anomalies in the tracer gas, which are indicative of underground deposits, are detected by transmiting a laser beam having narrow linewidth laser pulses at a high repetition rate with a center wavelength approximately equal to the atomic absorption line of the tracer gas to the area under investigation. The pulses are directed toward the investigated area from an airborne platform, reflected off the ground, and are collected by a detector on the airborne platform. Each pulse received is then broken down into a portion containing energy which is coincident with the absorption line of the tracer gas and a portion which is non-coincident with the absorption line of the tracer gas using a special optical filter. A tracer gas cell removes all the energy from the pulse which is coincident with the tracer gas absorpotion line, and the energy detected from the tracer gas cell corresponds to the amount of energy in the pulse which is off-resonance. By subtracting the off-resonance energy from the total energy received, it is possible to calculate the energy in the pulse which is received in the on-resonance spectral interval.
REFERENCES:
patent: 4489239 (1984-12-01), Grant et al.
Edward R. Murray, "Remote Measurement of Gases Using Discretely Tunable Infrared Lasers", SPIE, vol. 95, Modern Utilization of Infrared Technology 11 (1976).
Remote Measurement of Atmospheric Mercury Using Differential Absorption Lidar, Optics Letters, vol. 7, No. 5, May 1982.
Airborne Differential Absorption Lidar System for Water Vapor Investigations, Browell & Carter, Optical Engineering, vol. 20, No. 1, Jan./Feb. 1981.
Mercury Contamination, D'Itri, John Wiley & Sons, N.Y. (1977).
Exploration of Geothermal Areas Using Mercury: A New Geochemical Technique, Matlick & Buseck, Govt. Printing Office (1976).
Mercury Vapor as a Guide to Lead-Zinc-Silver Deposits, Hawkes and Williston, Mining Congress Journal, pp. 30-32, Dec. 1962.
Fields Carolyn E.
Miller John A.
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