Sensor for Simultaneous Measurement of Temperature and Humidity Based on a Chirped Fiber Bragg Grating Partially Bonded With Thick Polyimide Film
Yunqing Guan,
Ting Zhang,
Xiaopeng Dong
et al.
Abstract:This paper presents a compact fiber-optic sensor based on a fiber Bragg grating (FBG), partially bonded with thick polyimide (PI) films, for the simultaneous measurement of humidity and temperature. Half of the grating was attached to the PI film, while the rest of the grating remained bare. When the sensor was exposed to humidity and temperature changes, a significant non-uniform stress distribution was introduced along the entire grating. The chirp effect occurs, which causes the main peak of the spectrum to… Show more
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