Abstract
In order to achieve rotation angle measurement, one novel type of miniaturization fiber Bragg grating (FBG) rotation angle sensor with high measurement precision and temperature self-compensation is proposed and studied in this paper. The FBG rotation angle sensor mainly contains two core sensitivity elements (FBG1 and FBG2), triangular cantilever beam, and rotation angle transfer element. In theory, the proposed sensor can achieve temperature self-compensation by complementation of the two core sensitivity elements (FBG1 and FBG2), and it has a boundless angel measurement range with 2π rad period duo to the function of the rotation angle transfer element. Based on introducing the joint working processes, the theory calculation model of the FBG rotation angel sensor is established, and the calibration experiment on one prototype is also carried out to obtain its measurement performance. After experimental data analyses, the measurement precision of the FBG rotation angle sensor prototype is 0.2 ° with excellent linearity, and the temperature sensitivities of FBG1 and FBG2 are 10 pm/℃ and 10.1 pm/℃, correspondingly. All these experimental results confirm that the FBG rotation angle sensor can achieve large-range angle measurement with high precision and temperature self-compensation.
Highlights
Rotation angle measurement with high precision has a large demand in many application fields, for example, precision machining, aerospace, and military fields [1]
According to the design structure, the proposed sensor can achieve temperature self-compensation due to the complementation of the two core sensitivity elements (FBG1 and FBG2), and it has a boundless angel measurement range with 2π rad period due to the function of the rotation angle transfer element, theoretically
The proposed sensor can achieve self-temperature compensation by two core sensitivity elements (FBG1 and FBG2), and it has a boundless angel measurement range with 2π rad period due to the function of the rotation angle transfer element
Summary
Rotation angle measurement with high precision has a large demand in many application fields, for example, precision machining, aerospace, and military fields [1]. One novel type of miniaturization FBG rotation angle sensor with high measurement precision and temperature self-compensation is proposed in this paper. According to the design structure, the proposed sensor can achieve temperature self-compensation due to the complementation of the two core sensitivity elements (FBG1 and FBG2), and it has a boundless angel measurement range with 2π rad period due to the function of the rotation angle transfer element, theoretically. The temperature sensitivities of FBG1 and FBG2 are 10 pm/°C and 10.1 pm/°C, correspondingly All these experimental results confirm that the FBG rotation angle sensor can achieve large-range angle measurement with high precision and temperature self-compensation. The proposed sensor has certain application value in the rotation angle measurement
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