Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1997-10-09
1999-11-16
Kim, Robert H.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
21912162, G01J 344, G01N 2165
Patent
active
059867558
ABSTRACT:
A safety device for detecting elastically scattered radiation comprises: an excitation source of substantially monochromatic radiation having a controllable output, a detector for detecting elastically scattered radiation collected from a specimen illuminated by the excitation source, and a signal conditioning circuit that comprises a transducer and a comparator. An output transducer signal representative of the elastically scattered radiation is compared with a predefined threshold signal. If the output transducer signal is less than the threshold signal, a control output signal coupled to the excitation source causes the output of the source to be reduced. The safety device is included in an analyzer apparatus, preferably a Raman spectrometry apparatus that further includes an optical probe. The probe comprises a fluid-tight body that encloses three optical channels, preferably comprising optical fibers, that carry monochromatic radiation to a specimen and separately collect inelastically and elastically scattered radiation from the illuminated specimen. In a method for controlling a radiation source in an analyzer apparatus, a specimen is analyzed by an excitation source having a controllable output, preferably a laser. Elastically scattered radiation from the illuminated specimen is collected, detected, and transduced into an output transducer signal representative of the scattered radiation. If the output transducer signal is less than a predefined threshold signal, a control output signal coupled to the laser causes its output to be reduced.
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Alsmeyer Daniel Charles
Nicely Vincent Alvin
Ornitz Barry Louis
Pearce Michael Joseph
Eastman Chemical Company
Kim Robert H.
Smith Zandra V.
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