Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing liquid or solid sample
Patent
1989-01-27
1991-08-13
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing liquid or solid sample
422 55, 422 8205, 422 8208, 436136, 436138, 436144, 128633, 128634, 128636, 356432, 356436, 359839, 359884, G01N 2100, A67B 500, G02B 500
Patent
active
050394924
ABSTRACT:
An optical pH sensor and a gas sensor utilizing the pH sensor. The pH sensor includes an indicator whose absorbance is a function of the concentration of hydronium ions in a media surrounding the indicator. Light transmitted and reflected through the indicator of the sensor undergoes an absorption that is characteristic of the concentration of the hydrogen ion. The pH sensor can be used as to sense the concenration of a gas in a sample by surrounding the indicator with a liquid or liquid-containing media that changes pH as it is exposed to the gas, and separating the indicator and liquid or liquid-containing media from the gas with a membrane that is permeable to the gas to be measured. A measuring system used with the sensors transmits coherent radiation to the sensor through an optical fiber, separates the radiation returning from the sample into two wavelength bands, and digitally samples the photocurrents produced within the two wavelength bands. A microprocessor performs ratiometric calculations to measure the pH or gas concentration.
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Hartl James C.
Lawrence Dale M.
McCrae David A.
Saaski Elric W.
Wolthuis Roger A.
Metricor, Inc.
Trembley Theresa A.
Warden Robert J.
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