Optoacoustic gas sensor

Details Optoacoustic gas sensor Optoacoustic gas sensor

1998-01-22

1999-12-28

Williams, Hezron

Measuring and testing

Gas analysis

By vibration

73587, 73 2402, 73601, 250343, 356437, 422 83, G01N 2902, G01J 342, G01M 320

Patent

active

060065850

ABSTRACT:
In an optoacoustic gas sensor having a sensor body (1, 2), a light source (10), a measurement cell (6) with a gas-permeable membrane (15), a measurement microphone (13), and an optical measurement filter (11) between the light source (10) and the measurement cell (6), a reference cell (7) is included that is separate from the measurement cell (6). The reference cell (7) has a reference microphone (14) that is shielded against optoacoustic signals from the gas to be detected via the reference cell being substantially free from intensity-modulated optical radiation having an absorption wavelength of the gas to be detected. The measurement signal, which indicates gas concentration, is obtained by subtraction of the signals from the two microphones (13, 14).

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