发明名称 |
Method and apparatus for measuring gas concentrations |
摘要 |
Some embodiments are directed to a photoacoustic sensor. The photoacoustic sensor may comprise: a gas cell with an opening; a light source to generate to radiate a sample gas within the gas cell; an optical microphone to detect the sample gas within the gas cell; and a membrane aligned with the opening of the gas cell to permit sample gas to enter the gas cell. The optical microphone includes a semiconducting laser. The semiconducting laser includes a p-n junction within a cavity of the semiconducting laser. The optical microphone further includes a pressure-sensitive membrane that receives coherent light emitted from the semiconducting laser and directs reflected light back toward the semiconducting laser. During operation of the optical microphone, the pressure-sensitive membrane flexes in response to acoustic pressure waves. The phase of the reflected light is dependent upon a distance of the pressure-sensitive membrane from an aperture of the semiconducting laser.
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申请公布号 |
US8594507(B2) |
申请公布日期 |
2013.11.26 |
申请号 |
US201113162119 |
申请日期 |
2011.06.16 |
申请人 |
YOUNGNER DANIEL;LUST LISA;HONEYWELL INTERNATIONAL INC. |
发明人 |
YOUNGNER DANIEL;LUST LISA |
分类号 |
H04B10/00 |
主分类号 |
H04B10/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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