Method for operating gas concentration measuring device for e.g. monitoring concentration of alcohol in breathing gas of animal, involves synchronizing control voltage with light control signals

摘要

The method involves switching on and off of radiation sources (11, 12) over light control signals (33, 34), where the sources exhibit wavelengths ranging from 4-6 micrometers and 8-12 micrometers, respectively. A dual-band Fabry Perot interferometer (1) is aligned over a wavelength range over a control voltage (38), and a tuning direction of the interferometer is determined. The direction is changed by changing the control voltage from a low voltage level to a high voltage level and/or from the high voltage level to the low voltage level. The voltage is synchronized with the control signals. Independent claims are also included for the following: (1) a method for operating a dual-band Fabry Perot interferometer (2) a method for testing a dual-band Fabry Perot interferometer (3) a device for gas concentration measurement.