Gas e.g. laughing gas, concentration measuring device, has reflective mirrors, where distance between mirrors is changeable on basis of Fabry Perot interferometer, and transmissions of radiations are facilitated in two spectral regions

摘要

The device has a pair of reflective mirrors (2, 3), where a distance between the reflective mirrors is changeable on the basis of a double-band Fabry Perot interferometer (1). The reflective mirrors exhibit reflective coatings (8, 9), such that the transmissions of the radiations, which are emitted by a radiation source, are facilitated in two spectral regions. A control unit (5) specifies a dynamic region with a frequency for changing the distance between the reflective mirrors, and an evaluating unit separates measuring signals that are assigned to the spectral regions.