Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means
Patent
1997-07-24
1999-08-10
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Ultraviolet light responsive means
250345, G01N 2133
Patent
active
059362502
ABSTRACT:
Apparatus for the optical detection of selected toxic gases, using the ultraviolet region of the electromagnetic spectrum, and the known absorption properties of the toxic gases in the ultraviolet region. An ultraviolet flashlamp source illuminates a straight, highly polished metal tube with numerous perforations to permit access for the gas to be detected. The ultraviolet light then enters an optical compartment comprising an optical beamsplitter and two ultraviolet detectors with wavelength selective narrowband filters attached. The filters are selected so that one overlaps the region of absorption by the gas while the second is in a region where there is no absorption by the gas. The electronic circuit following the ultraviolet detectors and the drivers for the flashlamp, are timed by a microprocessor that provides the means for the electronics and data processing to be synchronized with the flashlamp pulse. The concentration of the absorbing gas is calculated from the output of the two detectors including the dark outputs measured while the flashlamp is turned off. By this method a parts per million sensitive toxic gas sensor useful to measure gases such as hydrogen sulfide, sulfur dioxide and benzene is obtained.
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Patent Abstracts of Japan vol. 096, No. 006, Jun. 28, 1996 & JP 08 043302 A (Horibaltd).
Baliga Shankar
Rabe Herbert H.
General Monitors, Incorporated
Hannaher Constantine
Jiron Darren M.
Roberts Larry K.
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