G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 29/14 (2006.01) G01N 29/42 (2006.01)
Patent
CA 2638053
The present invention targets gas sensors based on quartz-enhanced photo- acoustics, notably for applications where a very low price procial. The underlying idea is to replace the photo diode normally used for laser intensity measurement by the wall noise which is generated on the tuning fork. This eliminates the costs of the photo diode. The wall noise generated by the laser beam incident on the tuning fork is proportional to the intensity of the laser beam. Depending on the gas to be measured the wall noise signal can be separated from the gas concentration signal by using only one fork or a second fork preferably behind the first fork.
Kohli Markus
Seifert Andreas
Willing Bert
Ir Microsystems Sa
Leister Process Technologies
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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