Rapid response all-fiber moisture sensor

Combining the benefits of photothermal conversion in a doped optical fiber with principle Fiber Bragg Grating (FBG)-based temperature measurement, new method for measurement moisture content has been developed and its performance is reported. This novel all-fiber approach shows important characteristics fast response, miniaturization design low power consumption. In this work, 1480nm pump laser used to heat cobalt-doped used, which embedded sample under investigation, where sensor change was obtained by using FBG written into fiber. The fast, in-situ takes advantage linear relationship between experienced during heating process content. To calibrate characterize developed, variable moisture-content test platform established, experiments were conducted investigate approach. way evaluated measuring samples soil pulverized coal data good agreement results from more conventional (and slow) drying method, maximum error just over 1% rapid, 2s, optimum time achieved.