Photoacoustic sensor with mirror
First Claim
Patent Images
1. A photoacoustic sensing device comprising:
- a laser tuned to emit light to cause optical absorption by a gas to be detected;
a resonant sensor positioned to receive pressure waves from the gas, wherein the laser is modulated to match a resonant frequency of the resonant sensor; and
a first mirror positioned to receive light from the laser after the light has passed through the gas and to reflect the received light back through the gas to cause additional optical absorption.
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Abstract
A photoacoustic sensing device includes a laser tuned to emit light to cause optical absorption by a gas to be detected, a resonant acoustic sensor positioned to receive pressure waves from the gas, wherein the laser is modulated to match a resonant frequency of the resonant acoustic sensor, and a first mirror positioned to receive light from the laser after the light has passed through the gas and to reflect the received light back through the gas to cause additional optical absorption.
108 Citations
20 Claims
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1. A photoacoustic sensing device comprising:
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a laser tuned to emit light to cause optical absorption by a gas to be detected; a resonant sensor positioned to receive pressure waves from the gas, wherein the laser is modulated to match a resonant frequency of the resonant sensor; and a first mirror positioned to receive light from the laser after the light has passed through the gas and to reflect the received light back through the gas to cause additional optical absorption. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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projecting a laser beam toward gas, wherein the laser beam is tuned to at least one gas absorption line of a gas to be detected; detecting pressure waves generated by optical absorption of the laser beam by the gas to be detected; and reflecting the laser beam back through the gas to increase an amplitude of the generated pressure waves. - View Dependent Claims (11, 12, 13, 14)
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15. A method comprising:
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positioning a pressure wave detector proximate a gas to be detected; aiming a laser toward the gas to be detected, wherein the laser is tuned to a optical absorption line corresponding to a desired gas; and positioning a first mirror to receive a laser beam that has gone through the gas to be detected such that it reflects the laser beam back through the gas to be detected. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification