Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1993-03-29
1995-09-19
Limanek, Robert P.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
356307, 250282, 250286, G01J 344, G01N 2165
Patent
active
054520843
ABSTRACT:
A Raman spectroscopy system and method for determining a zero-calibration level. A gas sample chamber is located within a resonant cavity. A light source is located to cause light to be incident on the gas sample, the light resonates in the resonant cavity. Typically, the light source and resonator cavity in conjunction form a laser source which propagates coherent, monochromatic laser light energy through the gas sample. This causes Raman scattering from the gases constituent in the gas sample. The amount of Raman scattered light is measured at detectors along with light due to dark noise inherent in the detectors and glow from the laser source, i.e., light at wavelengths other than the laser light wavelength produced by the laser source. The resonator cavity is obstructed, via a ball inserted into the path of the laser beam for example, to prevent resonance. If the light source and resonant cavity in conjunction form a laser, prevention of resonance causes cessation of lasing. Thus, substantially no Raman scattering occurs and detectors measure light due primarily to background noise. The origin of the measurement scale for the detectors may then be set at the measured intensity, i.e., a zero-calibration level for the detectors may be determined.
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Beck Kent F.
Gregonis Donald E.
Miles Scott D.
Mitchell John
Albion Instruments, Inc.
Cassett Larry R.
Epperson Dennis H.
Limanek Robert P.
Rathbun Roger M.
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