Method and apparatus for detecting hydrocarbon vapors in a monitored area
First Claim
1. A method of detecting the presence of a predetermined hydrocarbon vapour of a predetermined concentration in a monitored area, comprising:
- exposing gas in or from the monitored area to radiation emitted from a flashlamp which emits both ultraviolet radiation and infrared radiation;
detecting ultraviolet radiation within a predetermined ultraviolet spectral range, and infrared radiation within a predetermined infrared spectral range, after the radiation emitted from said flashlamp has passed through said gas;
and comparing said detected ultraviolet radiation and infrared radiation with a reference of predetermined attenuation characteristics of said hydrocarbon vapour and concentration in said ultraviolet nd infrared spectral ranges.
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Abstract
A method and apparatus for detecting the presence of a predetermined hydrocarbon vapour of a predetermined concentration in a monitored area by: exposing gas in or from the monitored area to radiation from a Xenon flashlamp which includes ultraviolet radiation of a predetermined ultraviolet spectral range and infrared radiation of a predetermined infrared spectral range; detecting the radiation after having passed through the gas; and comparing the detected radiation with a reference of predetermined attenuation characteristics of the hydrocarbon vapour and concentration in the respective ultraviolet and infrared spectral range.
74 Citations
32 Claims
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1. A method of detecting the presence of a predetermined hydrocarbon vapour of a predetermined concentration in a monitored area, comprising:
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exposing gas in or from the monitored area to radiation emitted from a flashlamp which emits both ultraviolet radiation and infrared radiation; detecting ultraviolet radiation within a predetermined ultraviolet spectral range, and infrared radiation within a predetermined infrared spectral range, after the radiation emitted from said flashlamp has passed through said gas; and comparing said detected ultraviolet radiation and infrared radiation with a reference of predetermined attenuation characteristics of said hydrocarbon vapour and concentration in said ultraviolet nd infrared spectral ranges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for detecting the presence of a predetermined hydrocarbon vapour of a predetermined concentration in a monitored area, comprising:
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a flashlamp radiation means which emits both ultraviolet radiation and infrared radiation; means for exposing gas in or from the monitored area to the radiation emitted by said flashlamp radiation means; detector means for detecting ultraviolet radiation within a predetermined ultraviolet spectral range, and infrared radiation within a predetermined infrared spectral range, after the radiation emitted from said flashlamp has passed through said gas; and comparing means for comparing said detected ultraviolet and radiation infrared radiation with a reference of predetermined attenuation characteristics of said hydrocarbon vapour and concentration in said ultraviolet and infrared spectral ranges. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification