We present a novel device for measuring relative humidity. Different materials are used in the measurement of relative humidity. The sensor is built around gelatin surface diffraction gratings. This material expands and contracts in response to the amount of water vapor in the air. Diffracted orders appear when a light beam is directed at a grating. First order intensity varies with relative humidity due to gelatin swelling or shrinking. Calibration curves for intensity versus relative humidity have been discovered. The process of making diffraction gratings and testing prototype sensing devices is described.
Author (S) DetailsSergio Calixto
Centro de Investigaciones en Optica, Loma del Bosque 115, 37000 Le´on, GTO, Mexico.
Miguel V. Andres
Departamento de Fisica Aplicada y Electromagnetismo, Universidad de Valencia, Dr. Moliner 50, Burjassot, 46100 Val`encia, Spain.
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