Abstract
Because humidity is an important indicator used in many fields, the development of technology for its measurement is of great significance. We investigated humidity sensors that use a swellable polymer as the cladding material of plastic optical fibers (POFs). A POF humidity sensor using hydroxyethyl cellulose (HEC) as the cladding material has a linear response at approximately 20% relative humidity (RH), but its sensitivity is low. The sensitivity can be improved by adding brilliant blue (BB) as a dye to cladding. However, this makes the detection range of the sensor too narrow for practical use. Therefore, we change the incident light from a single wavelength to two wavelengths and use the fact that the output waveform of the dye-doped sensor depends on the wavelength of the incident light. The results of experiments show that a humidity sensor with high sensitivity and an RH detection range of 10%–90% can be developed by combining the output waveforms of a two-wavelength sensor with a dye doping level of 0.8% in cladding.
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