Calibrating an optical fiber humidity sensor and applying it in real-time monitoring of relative humidity in fresh concrete

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（9）
• 页码范围: 18-20
• 页数: 3页
• 语种: 英文
• DOI: 10.3788/COL201311.090604

摘要

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 ℃ 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.