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A doubly cladding single-mode fiber humidity sensor is fabricated by agarose.The sensor has an insertion loss of 0.08 dB and a power change of 17.83 dB.The responses of the sensor to a relative humidity(RH) range form 30% to 100% at a temperature range form 25 to 34 C are validated.The experiments demonstrate that the absorbability of agarose gel to moisture decreases with increasing RH in measured gas.We propose a calibration method that uses lookup tables and construct a corresponding calibration matrix.Using the sensor,we conduct real-time monitoring of RH in fresh concrete during its hardening process.
The sensors of the sensor to a relative humidity (RH) range form 30% to 100% at a temperature range form 25 to 34 C are validated. The experiments demonstrate that the absorbability of agarose gel to moisture decreases with increasing RH in measured gas. We propose a calibration method that uses lookup tables and construct a corresponding calibration matrix. Using the sensor , we conduct real-time monitoring of RH in fresh concrete during its hardening process.