Abstract: The sensor head of the high-temperature fiber optic sensor plays a very important role in the measurement, it directly determines the frequency response characteristics, distinguishability and other features of the sensor, so the detailed and advanced research is necessary. In this paper, the frequency response characteristics of high-temperature fiber optic sensor head are studied by means of a laser heated system, relationship between sensor head's response time and its geometrical sizes is obtained, which is in accord with theoretical evaluations. !4
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