Eddy current displacement sensor and method for expanding linear range of eddy current displacement sensor

A technology of displacement sensor and linear range, which is applied in the direction of instruments, electric devices, and electromagnetic means, etc. It can solve the problems of short detection distance, low sensitivity at the far end, narrow linear area, etc., and achieve the effect of a large degree of linearization

Pending Publication Date: 2021-09-07
SHANGHAI LANBAO SENSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The disadvantages of existing eddy current displacement sensors are short detection distance, narrow linear region, and short detection distance. The main reason is that the sensitivity of eddy current displacement sensors is generally low, and it is also related to the signal detection method. The narrow linear region is due to LC oscillation. The electromagnetic field generated by the device is attenuated as the target approaches, the signal presents a nonlinear change, and the near-end sensitivity is relatively high and the far-end sensitivity is low

Method used

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  • Eddy current displacement sensor and method for expanding linear range of eddy current displacement sensor
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  • Eddy current displacement sensor and method for expanding linear range of eddy current displacement sensor

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Embodiment 1

[0045] An eddy current displacement sensor, the eddy current displacement sensor includes a power supply module 1, an LC oscillation module 2, an MCU module 4 and a peak detection module 3, wherein,

[0046] The LC oscillation module 2 includes a coil ferrite and a positive feedback pulse comparison circuit. The LC oscillation module 2 provides a stable sinusoidal signal, wherein the positive feedback pulse comparison circuit is a stable oscillation circuit, which mainly provides a sinusoidal signal. The above LC oscillation module 2 is a high-precision low-temperature drift resistance container device. The temperature of the oscillation circuit is mainly determined by the temperature characteristics of the device itself. Here, a high-precision low-temperature drift resistance container device is selected. The key coils are closely arranged and wound with multi-strand enameled wires. Mounted in low temperature drift ferrite with magnetic permeability. In addition, the coil is ...

Embodiment 2

[0052] A method for expanding the linear range of an eddy current displacement sensor, comprising the following steps:

[0053] (1) Place the eddy current displacement sensor at a certain distance from the object to be measured, and the LC oscillation module 2 of the eddy current displacement sensor sends out an oscillation signal (sinusoidal signal);

[0054] (2) the MCU module 4 of the eddy current displacement sensor collects and outputs the DAC output voltage;

[0055] (3) The peak detection module 3 converts the oscillating signal (sinusoidal signal) into an analog quantity change, such as figure 2 and image 3 As shown, the comparator opens the drain output, the trough of the oscillation signal is compared with the DAC value, the object under test is close to the sensor, the oscillation signal (sinusoidal signal) decays and tends to stop the oscillation, and the comparison output logic ( figure 2 The output state of the output pin 4 of IC4) the low pulse width decrea...

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Abstract

The invention discloses an eddy current displacement sensor and a method for expanding a linear range of the eddy current displacement sensor. The eddy current displacement sensor comprises an LC oscillation module which is used for transmitting an oscillation signal; a MCU module used for collecting ADC voltage and outputting DAC output voltage; a peak detection module which is used for comparing the oscillation signal with the DAC output voltage to obtain a pulse square waveform signal, and converting the pulse square waveform signal into a DC voltage for output; and a power supply module which is used for supplying power to the LC oscillation module, the peak detection module and the MCU module. The eddy current displacement sensor and the method for expanding the linear range of the eddy current displacement sensor can achieve the effects of monitoring the position of the target object in real time, being long in detection distance and widening the linear region.

Description

technical field [0001] The invention relates to an eddy current displacement sensor, in particular to an eddy current displacement sensor and a method for expanding its linear range. Background technique [0002] The application market of eddy current displacement sensors is growing. In industrial automation, traditional eddy current proximity switches can only provide switching signals, but cannot provide real-time position information of the target. With the improvement of automation and the development of intelligence, it is very important to monitor the position information of the target object in real time. Therefore, accurate position information, wide measurement range, good temperature characteristics and high resolution are the key to measure the position of eddy current. important indicators of the sensor. [0003] The disadvantages of existing eddy current displacement sensors are short detection distance, narrow linear region, and short detection distance. The m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02
CPCG01B7/02
Inventor 谢勇许永童吴施庆姜春华
Owner SHANGHAI LANBAO SENSING TECH
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