Finesse Solutions, Inc.

Alfred Riddle

Mark D Selker

Barbara Paldus

John Havard

Anthony Sproul

A method for precision thermal measurement and control, especially for bioreactors, as well as the correction of temperature sensitive probes such as pH and dissolved oxygen. Typical control requirements are +/&#x2212;0.1&#xb0; C. The thermal measurement circuit converts a sensor output to a high level voltage or current with great accuracy and provides noise immunity and sensor isolation. While digital outputs from sensor converters can have the greatest noise immunity, the noise associated with digital circuitry may contaminate low level sensor signals so in many cases an analog sensor converter is preferred because of low noise generation, especially if the converter is near the sensor. The circuit is low cost, reliable, generates minimal heat is immune to, and does not generate noise, and requires minimal calibration effort.

System and method for temperature measurement

A system and method for analyzing a target analyte gas concentration using a photoacoustic spectroscopy cell comprising:

System and method for gas analysis using photoacoustic spectroscopy

A method for compensating for changes in output power or wavelength of an optical source with temperature. Many optical sources have power and/or wavelength variations with temperature which can be compensated by open- or closed-loop methods if a method of accurately measuring the optical source temperature is available. The voltage across a semiconductor junction varies with temperature. Measuring the optical source power or wavelength variation with temperature and tracking the voltage across the semiconductor junction provides a means for compensating an instrument for temperature induced optical output power or wavelength variations. An important field of application is optical density or turbidity measurements in cellular media.

System and method for laser temperature compensation

A method for analyzing a target analyte gas concentration using a photoacoustic spectroscopy cell comprising:

A method for analyzing gas concentration using doubly resonant photoacoustic spectroscopy, and a doubly resonant photaoacoustic gas detector comprising:

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Milpitas, CA, United States of America

Alfred Riddle