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US 2013/0239658 A1Published application
Photoacoustic sensor with mirror
AssigneeHoneywell International Inc.
InventorLisa Lust
Life of this patent
Estimating the term…
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.
Claims20
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.
1 more element
A method comprising:
- 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.
1 more element
A method comprising:
- 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.
1 more element
Dependencies are inferred from the claim text.