Gas Sensor Based On Photoacoustic Detection
First Claim
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1. A photoacoustic gas detector for detecting the concentration of at least one target gas, the gas detector comprising:
- a laser source;
a resonator extending along a longitudinal axis, the resonator having a first end, a second end, and an inner cavity between the first end and the second end, the inner cavity extending along the longitudinal axis and defining a longitudinal opening between the first end and the second end, the inner cavity adapted to allow a laser beam from the laser source to pass through the longitudinal opening; and
at least one tuning fork positioned along a longitudinal length of the resonator, said tuning fork comprising a first prong and a second prong, wherein the longitudinal axis does not intersect an area between the first prong and the second prong.
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Abstract
A photoacoustic gas detector and photoacoustic gas detection method are disclosed. The detector includes a laser source, an acoustic resonator, and at least one tuning fork positioned along a longitudinal length of the resonator. The detector is capable of performing fast measurements of the concentration of one or more target gases over a broad temperature range.
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Citations
21 Claims
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1. A photoacoustic gas detector for detecting the concentration of at least one target gas, the gas detector comprising:
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a laser source; a resonator extending along a longitudinal axis, the resonator having a first end, a second end, and an inner cavity between the first end and the second end, the inner cavity extending along the longitudinal axis and defining a longitudinal opening between the first end and the second end, the inner cavity adapted to allow a laser beam from the laser source to pass through the longitudinal opening; and at least one tuning fork positioned along a longitudinal length of the resonator, said tuning fork comprising a first prong and a second prong, wherein the longitudinal axis does not intersect an area between the first prong and the second prong. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining the concentration of at least one target gas using photoacoustic detection, the method comprising:
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directing a laser beam from a laser source into an inner cavity of an acoustic resonator, the resonator and the inner cavity extending along a longitudinal axis, the inner cavity containing a concentration of the at least one target gas, wherein interaction between the laser beam and the at least one target gas causes accumulation of an acoustic signal in the resonator; generating a resonant absorption signal relative to the concentration of the at least one target gas by at least one tuning fork positioned along a longitudinal length of the resonator, said tuning fork comprising a first prong and a second prong, wherein the longitudinal axis does not intersect an area between the first prong and the second prong. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification