The highly precise Laser Absorption Spectroscopy (LAS) measurement principle is based on the absorption of specific light wavelengths by the molecules to be detected.
As light source we are using laser diodes at wavelengths from the visible to the mid-infrared range, depending on the gas. By evaluating the intensity of transmitted (I) and incident light (I0) at the detector (Lambert-Beer’s law), the current gas concentration inside the measuring chamber can be determined.
The measured spectrum is compared to the theoretical spectrum based on the HITRAN database, which contains information about the gas absorption lines.
The deviation between both spectra (we call it “Spectral Correlation”) is continuously analyzed and verified. This plausibility-checking mechanism of our LAS sensors guarantees that any kind of abnormality will be detected and the user will be warned.
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