Optical humidity sensors are based on the principle of stimulating water molecules to vibrate using electromagnetic waves and thus absorbing electromagnetic energy at certain wavelengths (absorption bands). This absorption is compared with that at water-independent reference wavelengths and converted to % moisture using suitable models.

Our tri²dent “moist” humidity sensors work according to the same time/same spot principle: the sensor sends out three light signals of different wavelengths, which can be identified and evaluated by the receiver thanks to their special modulation. High-quality lock-in amplifiers prepare the signals in the detector with precise frequency and phase. The LED technology used guarantees a long service life for the light sources. Robust fiber optic technology with hundreds of individual fibers enables long-term use even in industrial environments.