G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/31 (2006.01) G01N 21/17 (2006.01) G01N 21/61 (2006.01)
Patent
CA 2182319
A photo-acoustic gas sensor for measuring the concentration of different gases, including explosive gases, consists of a cylindrical sensor body (1) which contains a likewise cylindrical measuring cell 13, the longitudinal axis of which extends at right angles to the longitudinal axis of the cylindrical sensor body 1. The length of the measuring cell can be changed in accordance with a desired measuring sensitivity and a desired measurement range, while the outer dimensions of the sensor body 1 remain unchanged. A light source 5 is arranged in such manner that it irradiates the measuring cell 13, but the membrane 2 remains non-irradiated and cannot produce interference signals. The gas sensor is rendered explosion-proof in that the light source 5 and a photo-diode 6 which monitors the light source 5 are tightly sealed from the environment. The function of the microphone 4, the light source 5 and the photo-diode 6 are monitored by the analysis of a background signal.
Baraket Mourad
Forster Martin
Pleisch Rolf
Baraket Mourad
Forster Martin
Kirby Eades Gale Baker
Pleisch Rolf
Siemens Building Technologies Ag
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