Calibrating device for eddy sensor

An eddy current sensor and calibration device technology is applied in the field of detection technology and sensors to achieve the effects of improving test accuracy, improving adaptability and accuracy, and reducing influence

Inactive Publication Date: 2012-07-04
XI AN JIAOTONG UNIV
4 Cites 15 Cited by

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Abstract

The invention discloses a calibrating device for an eddy sensor. The calibrating device comprises a micrometer, wherein the micrometer is fixed on a rack base through a micrometer bracket; a measuring flat-end is connected with the micrometer; a sensor bracket is fixed on the rack base; a sensor positioning block is fixed on the sensor bracket; the sensor bracket and the axis of the micrometer bracket are on the same straight line; a V-shaped groove structure is arranged on the sensor bracket; the eddy sensor is clamped in the V-shaped groove structure and locked through the sensor positioning block and a positioning screw; the rack base is made from high-carbon steel and marble materials; the reaction of the eddy sensor to displacement variation can be calibrated by fine adjustment to precision of the micrometer; calibration is realized by data comparison; and by changing the distance between the eddy sensor end surface and the measuring flat-end, the linearity and the sensitivity of the eddy sensor can be measured. Therefore, the calibrating device has the characteristics of high resolution, easy operation and adjustable linear range, and has the advantages of stable and reliable detection result and simple operation.

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  • Calibrating device for eddy sensor
  • Calibrating device for eddy sensor
  • Calibrating device for eddy sensor

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Example Embodiment

[0019] The present invention will be described in detail below in conjunction with the drawings.
[0020] Reference figure 1 , An eddy current sensor calibration device, including a micrometer 1, the micrometer 1 is fixed on the base 3 of the bench through the micrometer bracket 5, the micrometer measuring rod is free to move according to the specific reference value, and the movement amount is read out by the digital display reading head through the controllable The fine-tuning device can accurately move the distance of the probe and fix the distance between the sensor under test and the test head 2 to achieve the purpose of calibration. Figure 3a with Figure 3b , The test flat head 2 is connected with the micrometer 1 by screws, the sensor bracket 4 is fixed on the base 3, the sensor positioning block 6 and the positioning screw 7 are fixed on the sensor bracket 4, the axis of the sensor bracket 4 and the micrometer bracket 5 are in the same straight line.
[0021] Reference Figure 2a with Figure 2b The sensor bracket 4 is provided with a V-shaped groove structure 8. The eddy current sensor is clamped in the V-shaped groove structure 8. The sensor bracket 4 of the V-shaped groove structure 8 can be adapted to different types and sizes of eddy current sensors. Secondly, the eddy current sensor under test can be effectively fixed and effectively fixed by the positioning screw 7 and the V-shaped groove structure on the sensor bracket. When the sensor is clamped in the V-shaped groove structure 8, it is locked by the sensor positioning block 6 and the positioning screw 7. The best state of 3-point fixed support is formed, and the installation thread of the eddy current sensor is not easily damaged.
[0022] The stand base 3 is made of high-carbon steel and marble materials. The high-carbon steel and marble materials can reduce the influence of the external environment on the test results and improve the measurement accuracy.
[0023] The working principle of the present invention is:
[0024] During the calibration process, the eddy current sensor is installed in the V-shaped groove structure 8 of the sensor bracket 4, and after selecting the appropriate test flat head 2, adjust the distance between the sensor end surface and the detection surface of the test flat head 2 through the micrometer 1, and read the micrometer 1 The multiple sets of measured distance display values ​​are compared with the induced displacement change output by the measured eddy current sensor, and finally the sensitivity and output voltage change of the eddy current sensor are determined to achieve the purpose of calibrating and calibrating the sensor. In actual calibration, because The test principle of the eddy current sensor is limited. The calibration accuracy mainly depends on the accuracy of the micrometer 1. Choosing a high-precision micrometer 1 is a necessary factor to achieve precise calibration. In the face of different materials to be tested, different test flat heads 2 can be replaced. Improve the adaptability of the measured value of the eddy current sensor to different materials.
[0025] In summary, the present invention controls and calibrates the response of the eddy current sensor to the displacement change through the fine adjustment of the micrometer accuracy, and achieves the purpose of calibration through data comparison. Changing the distance between the end face of the eddy current sensor and the test flat head can improve the linearity of the eddy current sensor. , Sensitivity testing, simple structure, easy adjustment, less environmental interference, high test and calibration accuracy can be obtained at the same time, and the detection result is stable and reliable. The calibration resolution of the present invention is 1μm, the linear measurement range is 0-25mm, and the test The diameter of the sensor ranges from 2 to 15mm.
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