Photo-acoustic gas sensor and its manufacture and use

Details Photo-acoustic gas sensor and its manufacture and use Photo-acoustic gas sensor and its manufacture and use

1996-09-04

1998-05-19

Williams, Hezron E.

Measuring and testing

Gas analysis

By vibration

250343, 73 2402, G01N 2902

Patent

active

057537976

ABSTRACT:
A photo-acoustic gas sensor for measuring a gas concentration, e.g., of an explosive gas, consists of a cylindrical sensor body (1) which includes a cylindrical measurement chamber (13) whose longitudinal axis extends perpendicular to the longitudinal axis of the cylindrical sensor body. Without changing the outer dimensions of the sensor body, the length of the measurement chamber can be changed in accordance with a desired measurement sensitivity and a desired measurement range. A light source (5) is disposed such that it irradiates the measurement chamber without irradiating a gas-permeable membrane (2), so that the membrane will not produce an interference signal. The gas sensor is rendered explosion-proof as the light source and a photo-diode (6) which monitors the light source are tightly sealed from the environment. Proper functioning of a microphone (4), the light source and the photo-diode are monitored by analyzing a background signal.

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