A method for temperature compensation of quartz resonant accelerometer

An accelerometer and temperature compensation technology, which is used in the measurement of acceleration, speed/acceleration/shock measurement, instruments, etc., can solve problems such as poor effect and inability to real-time, and achieve the effect of low temperature compensation cost and controllable precision temperature compensation

Active Publication Date: 2020-12-04
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The commonly used method of temperature measurement compensation is to use an external temperature measurement sensor for temperature detection and establish a compensation model. Due to the uncertainty of the temperature field distribution and the delay of heat conduction, this compensation method is not effective and cannot be performed in real time and with high precision. Temperature Error Compensation

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  • A method for temperature compensation of quartz resonant accelerometer
  • A method for temperature compensation of quartz resonant accelerometer
  • A method for temperature compensation of quartz resonant accelerometer

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] combine figure 1 , a temperature compensation method for a quartz resonant accelerometer, the quartz resonant accelerometer is placed in a high and low temperature constant temperature control box, and in the case of no acceleration signal input, any temperature is maintained within the working range of the box temperature -30°C to 80°C constant. In order to balance the temperature in the temperature control box and reduce the influence of the temperature gradient on the test data, first lower the temperature in the temperature control box to -20°C, keep it warm for 30 minutes, then increase the temperature, and keep warm at each temperature point For 30 minutes, take n temperature measuring points for testing. Including the following steps:

[0041] Step 1: Build a temperature error compensation model for the static temperature characteristics of the acceler...

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Abstract

The invention discloses a temperature compensation method for a quartz resonant accelerometer. According to the method, the relationship curve of static accelerometer frequency output and temperaturechange is calibrated under an acceleration-free condition; a temperature error compensation model is corrected according to the target accuracy of the accelerometer; and the frequency output of the accelerometer is measured under an acceleration condition; and on the basis of the previously obtained temperature error compensation model, temperature-induced error is subtracted from the measured frequency output, and therefore, temperature error compensation is completed. With the temperature compensation method for the quartz resonant accelerometer of the invention adopted, the uncertainty of temperature field distribution and the large deviation of compensation results which is brought about by heat conduction delay in traditional direct temperature compensation can be eliminated; and real-time and precision-controllable temperature compensation can be realized. The temperature compensation of the temperature compensation method is low in cost, does not require an additional external sensor, and can be realized by using the quartz resonant accelerometer device itself.

Description

technical field [0001] The invention belongs to the technical field of accelerometers, and in particular relates to a temperature compensation method for a quartz resonant accelerometer. Background technique [0002] Quartz resonant accelerometer is a micro inertial device with an open-loop structure. It is driven by a crystal-controlled oscillator to resonate with a quartz resonator. The change of its output frequency is proportional to the change of input acceleration. The frequency output in digital form can eliminate the speed increment error caused by analog-to-digital conversion, and is compatible with high-speed digital navigation systems. Due to the change of the vibration frequency, elastic constant, density and structural size of the accelerometer caused by the temperature change, the final measurement result cannot meet the measurement accuracy requirements. At the same time, these measurement errors will change with the change of temperature, so it is very neces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P15/097
CPCG01P15/097
Inventor 裴荣吴键吴趟林名
Owner NANJING UNIV OF SCI & TECH
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