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Fast humidity sensor for high range 80–95% RH

2002; Elsevier BV; Volume: 100; Issue: 1 Linguagem: Inglês

10.1016/s0924-4247(02)00063-8

1873-3069

Brice Sorli, F. Pascal‐Delannoy, Alain Giani, A. Foucaran, A. Boyer,

Photonic and Optical Devices

In this work an original humidity sensor is described. It is based on the cooled mirror principle with optical detection. The sensor is composed of a reflective sensor and a Peltier module. The thermoelectric cooling allows to reach the dew point and to evaporate the condensate water. The response of the reflective sensor placed opposite to the mirror follows the appearance and evaporation of water condensate mass. The integral of the optical signal variation is proportional to the percentage of relative humidity. Relative humidity measurements are performed in a dew point generator (HUMOR 10) in the range of 80–95% RH, with a high accuracy and an excellent reproducibility. The measurement of the analyzed air is made in 10 s.