Very low cost narrow band infrared sensor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Feb 10, 2005
app pub date -
Jun 21, 2004
filing date -
Jun 20, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An optical sensor for detecting a chemical in a sample region includes an emitter for producing light, and for directing the light through the sample region. The sensor also includes a detector for receiving the light after the light passes through the sample region, and for producing a signal corresponding to the light the detector receives. The sensor further includes a thermo-optic filter disposed between the emitter and the detector. The optical filter has a tunable passband for selectively filtering the light from the emitter. The passband of the optical filter is tunable by varying a temperature of the optical filter. The sensor also includes a controller for controlling the passband of the optical filter and for receiving the detection signal from the detector. The controller modulates the passband of the optical filter and analyzes the detection signal to determine whether an absorption peak of the chemical is present.
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