Optics: measuring and testing – Inspection of flaws or impurities – Bore inspection
Patent
1975-07-25
1976-12-07
Corbin, John K.
Optics: measuring and testing
Inspection of flaws or impurities
Bore inspection
250343, 356 97, 356201, G01J 342, G01N 2124
Patent
active
039959600
ABSTRACT:
The sensitivity of an opto-acoustic absorption detector is increased to make it possible to measure trace amounts of constituent gases (approaching 0.01 parts per billion) in a sample by creating a second beam radiation path through the sample cell identical to a first path except as to length, alternating the beam through the two paths and minimizing the detected pressure difference for the two paths while the beam wavelength is tuned away from the absorption lines of the sample. Then with the beam wavelength tuned to the absorption line of any constituent of interest, the pressure difference is a measure of trace amounts of the constituent. The same improved detector may also be used for measuring the absorption coefficient of known concentrations of absorbing gases.
REFERENCES:
patent: 3820901 (1974-06-01), Kreuzer
Delany, M. E., "The Optic-Acoustic Effect in Gases;" Science Progress, July 1959, vol. 47, No. 187, pp. 459-467.
Fletcher James C. Administrator of the National Aeronautics and Space
Rosengren Lars-Goran
Corbin John K.
Manning John R.
McCaul Paul F.
Mott Monte F.
Rosenberger Richard A.
LandOfFree
Method and apparatus for background signal reduction in opto-aco 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 and apparatus for background signal reduction in opto-aco, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for background signal reduction in opto-aco will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-376392