Gas detection method and gas detection device

Abstract

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).

Description

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AI Technical Summary

Benefits of technology

This technology allows for accurate measurements on both high power (HW) light emitting diodes (LEDs), such as those used in industrial applications like machining or welding processes, without requiring any extra equipment. It also ensures consistently reliable results even when there are changes over time due to factors like ambient temperatures or agitation conditions affecting the emission characteristics of LED lights.

Problems solved by technology

Technologies described involve detectors used in industrial processes like manufacture, quality control, monitoring, and inspections. However, these technics have limitations because it requires specific parts inside the process equipment to operate correctly without causing defective products during production. These technical problem addressed by the present patents relates to improving the accuracy and resolution of gas sensory measurements while reducing variations in detected signals attributed to etialone friction patterns.

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