A Temperature Drift Compensation Method for Piezoelectric Acceleration Sensor

An acceleration sensor and temperature drift compensation technology, applied in the direction of speed/acceleration/shock measurement, acceleration measurement using inertial force, detailed information of speed/acceleration/electric shock meter, etc., can solve the problem of complex structure of piezoelectric acceleration sensor and averaging Problems such as temperature compensation and drift phenomenon

Active Publication Date: 2020-12-25
北方科源(北京)科技发展有限公司
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Problems solved by technology

[0003] Due to the complex structure of the piezoelectric acceleration sensor, as the ambient temperature changes, the effect of thermal expansion and contraction of the accelerometer structure, residual stress, system stiffness changes, and circuit temperature drift will cause the output to drift. This drift phenomenon is Non-linear changes, it is difficult to use multi-order polynomial fitting to obtain, and the method of calculating the average temperature compensation is also difficult to eliminate this drift phenomenon well

Method used

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  • A Temperature Drift Compensation Method for Piezoelectric Acceleration Sensor
  • A Temperature Drift Compensation Method for Piezoelectric Acceleration Sensor
  • A Temperature Drift Compensation Method for Piezoelectric Acceleration Sensor

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Embodiment 1

[0042] Embodiment 1 of the present invention provides a temperature drift compensation method for piezoelectric acceleration sensors, such as figure 1 As shown, the temperature drift compensation method includes the following steps:

[0043] 1): Obtain different temperature values ​​t 1 The output voltage of the corresponding piezoelectric acceleration sensor; the present invention uses a precision digital temperature control box to perform temperature compensation experiments. The temperature control box can meet the temperature fluctuation range within ±0.3°C, from -40°C to 120°C, The output of the piezoelectric acceleration sensor can be measured every 5°C or 10°C rise, or the temperature value can be randomly selected, and then the output voltage of the piezoelectric acceleration sensor can be measured, and the temperature of the temperature control box can be recorded at the same time 1 ; In order to avoid the influence of air pressure changes in the temperature control ...

Embodiment 2

[0050] Embodiment 2 of the present invention provides a temperature drift compensation method for a piezoelectric acceleration sensor. The temperature drift compensation method is basically the same as that in Embodiment 1. The difference is that step 1) also includes obtaining the internal temperature of the piezoelectric acceleration sensor. value t 2 , put t 1 with t 2 For comparison, when t 1 = t 2 , proceed to step 2) and step 3). In order to keep the temperature of the temperature control box the same as the internal temperature of the piezoelectric acceleration sensor, each time the temperature control box changes a temperature value, the same temperature is kept at a constant temperature for 1 hour to improve the accuracy of temperature drift compensation.

Embodiment 3

[0052] Embodiment 3 of the present invention provides a temperature drift compensation method for a piezoelectric acceleration sensor. The temperature drift compensation method is basically the same as that in Embodiment 2. The difference is that, as Image 6 As shown, the temperature drift compensation method also includes:

[0053] 4): when t 1 ≠t 2 , calculate t 1 with t 2 The temperature difference Δt, and the temperature difference Δt and the temperature difference threshold Δt 1 For comparison, when Δt≤Δt 1 , proceed to step 5);

[0054] 5): Using the wavelet neural network to process the different temperature values ​​t obtained in step 1) respectively 1 and the corresponding output voltage and temperature value t 2 Fitting the nonlinear relationship with the corresponding original output voltage to construct a first temperature drift compensation model and a second temperature drift compensation module;

[0055] 6): Input the obtained internal temperature value...

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Abstract

The invention provides a temperature drift compensation method of a piezoelectric acceleration sensor. The temperature drift compensation method comprises the following steps: acquiring output voltages of the piezoelectric acceleration sensor corresponding to different temperature values t1; fitting a nonlinear relation between the different temperature values and corresponding output voltages acquired in the step S1 by utilizing a wavelet neural network, and constructing a temperature drift compensation model; compensating the original output voltage of the piezoelectric acceleration sensor by utilizing the temperature drift compensation model. Through the method provided by the invention, the method provided by the invention can effectively solve the fitting problem that the piezoelectric acceleration sensor outputs an output data curve with high-frequency change due to the temperature change. The compensation method is simple and reliable, and has the features of being fast in convergence rate and high in high-frequency nonlinear fitting precision in comparison with the ordinal neural network, the least square method and like algorithms, and the monotonicity-based autonomous segmentation can be performed according to the input temperature curve, and the segmentation is comparatively accurate.

Description

technical field [0001] The invention belongs to the field of temperature drift compensation of acceleration sensors, in particular to a temperature drift compensation method of piezoelectric acceleration sensors. Background technique [0002] The piezoelectric acceleration sensor uses the piezoelectric effect of the material to detect vibration. The piezoelectric material is greatly affected by temperature. In order to meet wider working requirements, the piezoelectric acceleration sensor needs to be temperature compensated. At present, there are many studies on temperature compensation, temperature test and static temperature model identification of piezoelectric acceleration sensors at home and abroad, including hardware methods and software methods. The hardware method is a temperature compensation method for the accelerometer conversion circuit, such as hardware symmetry method, thermistor compensation method, memory function block compensation method, calculus suppressi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P15/09G01P1/00G06N3/04G06N3/08
Inventor 刘占亮苏乾浦
Owner 北方科源(北京)科技发展有限公司
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