Micromachined integrated opto-flow gas/liquid sensor
First Claim
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1. A micromachined gas/liquid sensor comprising:
- a first layer;
a light source formed on said first layer;
a second layer formed on said first layer;
an optical filter formed on said second layer;
a cavity formed on said second layer;
a pressure sensor formed proximate to said cavity; and
a porous filter formed on said cavity.
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Abstract
A micromachined integrated opto-fluidic or opto-acoustic sensor having a rapidly intensity-varying or pulsing light source, an interference filter, a gas cavity, which may or may not be an optical and/or acoustic resonator tuned to a particular wavelength of light, or sound frequency, into which the detected gas can diffuse into via a filter, and a fluidic or pressure sensor to detect the heating and cooling, and the resulting expansion and contraction of the gas due to the absorption of light at the particular wavelength by the specific gas being detected. The presence of other gases is inferred from the detected gas.
55 Citations
19 Claims
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1. A micromachined gas/liquid sensor comprising:
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a first layer; a light source formed on said first layer; a second layer formed on said first layer; an optical filter formed on said second layer; a cavity formed on said second layer; a pressure sensor formed proximate to said cavity; and a porous filter formed on said cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A micromachined gas/liquid sensor comprising:
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a substrate; an optical filter situated on a first surface of said substrate; a first layer situated on said filter; a heater formed in said first layer; a second layer situated on the second surface of said substrate; a cavity formed between a portion of said second layer and the second surface of said substrate; a pressure sensor situated proximate to said cavity; and a porous filter formed on said cavity. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification