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
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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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