凤凰彩票10分快3⎛⎝kIXKu⎠⎞ Displacement sensor fault analysis and Solutions - Technical Support - Shenzhen easy test Electric Co., Ltd

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Fault analysis and solution of displacement sensor

Release date: June 16, 2019 Hits: 109

Displacement sensor There are many reasons for the failure. Based on years of experience, the editor summed up the following problems and analyzed the causes and solutions of the problems:

 

Sensitivity problem

Low sensitivity

Displacement sensor The insulation impedance of the sensitive core decreases

If the displacement sensor is baked in its temperature range, the sensitivity can rise again, but generally it will decrease again.

Piezoelectric coefficient attenuation of sensor core

Calibrate the linear displacement sensor again.

The sensitivity deviation is large

In the non room temperature environment, the sensitivity deviation is caused by the excessive temperature response coefficient of piezoelectric materials

The sensor with small temperature response coefficient deviation is selected

Low frequency measurement signal distortion

Low frequency response of the system is poor

The cutoff frequency of low frequency response of displacement sensor is not low enough

Check the low frequency response of the displacement sensor (which can be judged by measuring the time constant), and select the pull rope displacement sensor with good low frequency.

The cutoff frequency of constant current voltage source or charge amplifier used with displacement sensor is not low enough

The low frequency cut-off frequency of constant current voltage source and charge amplifier is correctly selected.

Low frequency signal to noise ratio difference

The low frequency noise of displacement sensor is large

The signal-to-noise ratio (SNR) of the sensor will decrease significantly at low frequency magnetostrictive displacement sensor

Influence of external environment on measurement signal

Transient ambient temperature effect

The heat insulation sheath is used for the sensor, and the sensor with small temperature response coefficient is selected.

High frequency measurement signal distortion

High frequency signal increases

High frequency signal distortion (increase) caused by installation mode of displacement sensor

Adjust the installation mode, increase the installation contact stiffness, and improve the high frequency measurement range of the displacement sensor.

The resonance frequency of internal sensitive core of displacement sensor is low

The sensor with high resonance frequency and good high frequency response is selected.

magnetostrictive displacement sensor The connection rigidity of installing insulating base is poor

Re selection of high rigidity insulation mounting base

High frequency signal reduction

In the long distance signal transmission, the constant current of constant current voltage source is not large enough

Choose the correct voltage source constant current according to the signal frequency amplitude

 

Large measurement signal distortion

The signal output becomes smaller

The measurement range is reduced due to the decrease of supply voltage

Replace the battery or correct the supply voltage

The bias voltage is out of the specified range due to different ambient temperature and room temperature

Sensor with bias voltage stabilization

The nonlinearity caused by the displacement sensor

Using the pull rope displacement sensor with large measuring range

In the long distance signal transmission, the constant current of constant current voltage source is not large enough

Choose the correct voltage source constant current according to the signal frequency amplitude

Bias voltage instability

Superposition of output signal and high frequency harmonic wave

Generally, it is caused by the resonance frequency of the sensor, so the sensor with higher resonance frequency is selected

Small measurement signal distortion

The signal varies from big to small and unstable

The output signal is unstable due to transient temperature change and bias voltage fluctuation

Sensor with bias voltage stabilization

Influence of external environment noise on measurement signal

Noise caused by grounding circuit

Multi point grounding is avoided, and the sensor is insulated to ground.

Influence of electromagnetic wave

Sensor with double shielding case.

The influence of strong sound field

The sensor with double shielding shell will help to reduce the influence of strong sound field on displacement sensor.

Transient ambient temperature change

For high sensitivity sensors used in ultra-low frequency measurement, thermal insulation sheath must be used.

Influence of base strain of measured point

The shear displacement sensor with small base strain is selected to minimize the contact area between the sensor and the object to be measured.

Influence of measurement system noise on measurement signal

Electrical noise of acceleration sensor

To verify the sensor noise, select the sensor with appropriate signal-to-noise ratio.

Electrical noise caused by cables

The low charge type is often used with cable shielded low noise.

Sensor power supply noise

Choose low noise power supply or battery power supply.

Range setting of data acquisition system

Select the appropriate range



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