Optics: measuring and testing – Optical pyrometers
Patent
1982-05-28
1985-01-15
McGraw, Vincent P.
Optics: measuring and testing
Optical pyrometers
73705, 356 45, 374137, G01J 558, G01L 1100
Patent
active
044935536
ABSTRACT:
In a method of and apparatus for making remote measurements of temperature and pressure in a gas, laser beams are transmitted through the gas to a reflecting target, which may be either a solid surface or particulate matter in gas or the gas molecules and the return beams are measured to determine the amount of energy absorbed by the gas. For temperature measurements, the laser beam has a wavelength whereat the gas exhibits a relatively temperature sensitive and pressure insensitive absorption characteristic, whereas for pressure measurements, the laser beam has a wavelength whereat the gas has a relatively pressure sensitive and temperature insensitive absorption characteristic. To reduce the effects of scattering on the absorption measurements, a reference laser beam having a weak absorption characteristic is transmitted colinearly with the data beam having a strong absorption characteristic. The two signals are processed as a ratio to eliminate back scattering that is common to the two beams. Various embodiments of transmitters and receivers are described for practicing the invention, such as a sequential laser pulse transmitter (20, 51) and receiver (68), simultaneous laser pulse transmitter (100) and receiver (116) and c.w. laser transmitter (134) and receiver (154).
REFERENCES:
patent: 3632212 (1972-01-01), Bernal
patent: 3734620 (1973-05-01), Cade
patent: 3817622 (1974-05-01), Billman et al.
patent: 4123160 (1978-10-01), Caputo et al.
Kalshoven, Jr. et al., "Laser Remote Sensing of Atomspheric Temperature by Observing Resonant Absorption of Oxygen," Applied Optics, vol. 20, No. 11, Jun. 1, 1981, 1967-1971.
Mason, "Lidar Measurement of Temperature: A New Approach" Applied Optics, vol. 14, #1, Jan. 1975, pp. 76-78.
EOS Transactions, American Geophysical Union, Korb et al., vol. 60, No. 18, May 1, 1979.
9th International Laser Radar Conference on Laser Atmospheric Studies--Conference Abstracts, Korb et al., Jul. 2-5, 1979.
Engineering a Laser Remote Sensor for Atmospheric Pressure and Temperature, NASA Technical Memorandum 79538, Kalshoven, Jr. et al., Apr. 1978.
A Laser Technique for the Remote Measurement of Pressure in the Troposphere, 8th International Laser Radar Conference, Conference Abstracts, Korb, Jun. 6-9, 1977.
Kalshoven, Jr. James E.
Korb Charles L.
Manning John R.
McGraw Vincent P.
Sandler Ronald S.
The United States of America as represented by the Administrator
Tresansky John O.
LandOfFree
Method of and apparatus for measuring temperature and pressure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and apparatus for measuring temperature and pressure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for measuring temperature and pressure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1479232