G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/61 (2006.01) G01N 21/39 (2006.01)
Patent
CA 2585537
The invention proposes a method for etalon suppression in a gas detection device by determining an etalon fringe period during a calibration step without gas in dependency of the DC drive current. A measuring signal which is a function of the gas absorption and substantially independent of an intensity modulation of an initial light signal at an initial frequency (f) is generated by determining a first pre-measuring signal when the laser source is operated at the center of the gas absorption peak, a second pre-measuring signal when the laser source is operated with a DC drive current below the gas absorption peak of the gas to be detected, and a third pre-measuring signal when the laser source is operated with a DC drive current above said gas absorption peak, with a difference between said DC drive currents which corresponds to the etalon fringe period determined in a calibration step before. The final measuring signal is determined as the difference between the first pre-measuring signal and the arithmetic mean of the second pre-measuring signal and the third pre-measuring signal. This etalon fringe suppression allows to implement a substantial simplification of a reference channel in a gas detector, which does not require separate lock-in channels which analyse the detector signal either on the modulation frequency (f), or on twice the modulation frequency (2f).
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
LandOfFree
Gas detection method and gas detection device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas detection method and gas detection device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas detection method and gas detection device will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1626111