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High precision accelerometer resolution test method

A technology of accelerometer and test method, which is applied in the direction of speed/acceleration/shock measurement, test/calibration of speed/acceleration/shock measurement equipment, measurement device, etc., which can solve problems such as unavoidable effects, avoid adverse effects, and be easy to use Realize and ensure the effect of accuracy

Active Publication Date: 2020-12-15
TIANJIN NAVIGATION INSTR RES INST
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Problems solved by technology

[0003] In the traditional accelerometer resolution test, mechanical structure devices are used or the angle between the sensitive axis of the accelerometer and the horizontal plane is changed or the distance between the gravitational block and the accelerometer is changed. Impact of Resolution Measurements
Restricted by the manufacturing limit of the test device, these traditional test methods are only suitable for accelerometer resolution tests with general precision

Method used

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Embodiment Construction

[0023] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the embodiments are illustrative, not restrictive, and cannot limit the protection scope of the present invention.

[0024] A high-precision accelerometer resolution testing method, comprising the following steps:

[0025] ⑴. Select two high-precision accelerometers 2 with the same or similar scales. The similar scales mean that the index difference is less than 1×10 -3 V / g, two accelerometers are placed on the shock-isolation device, the shock-isolation device is a shock-isolation marble base 1;

[0026] ⑵.Based on the differential capacitance method test, a small capacitor 4 is connected to the same end of the two accelerometer sensors through a wire 3 to change the position of the pendulum when the capacitance at both ends of the sensor is balanced. The small capacitor is a pF capacitor;

[0027] ⑶. Use a digital switch to...

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Abstract

The invention relates to a high-precision accelerometer resolution test method. Based on a differential capacitive method, a mini capacitor is connected in series to one end of each accelerometer, output of the two accelerometers with similar scales is summed during test, a digital switch controls ON / OFF between the mini capacitor and an accelerometer loop, and the resolution is tested. The methodcan be used to overcome strict requirements for high-precision accelerometer resolution test via traditional equipment, and principally, the method can be used to measure the resolution <=1*10<-6>g precisely and effectively. The capacitance difference between the two ends of the accelerometer is changed directly to reach mini acceleration input, an experimental device can be simplified greatly, and influence of vibration of measuring equipment on a test result during traditional measurement can be neglected. Via the double-accelerometer summation method, common-mode noise influence can be reduced greatly, available acceleration signals are extracted, the resolution of high-precision accelerometers whose resolution is higher than 1*10<-6>g can be tested, and the method has significance inguidance.

Description

technical field [0001] The invention relates to the technical field of accelerometer resolution testing, in particular to a high-precision accelerometer resolution testing method. Background technique [0002] As the core component of the inertial navigation system, the accelerometer is widely used in aerospace, automobile, electronics and other technical fields, and can measure the linear acceleration of the carrier. As an important indicator of an accelerometer, resolution reflects the tiny limit to which the accelerometer can be sensitive to acceleration. The higher the resolution, the smaller the acceleration value that can be sensitive. In the field of high-precision measurement, the accelerometer index of resolution has attracted much attention. When testing the resolution of the accelerometer, it is necessary to artificially give the accelerometer a tiny input, and then perform data collection and processing. [0003] In the traditional accelerometer resolution tes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P21/00
CPCG01P21/00
Inventor 侯文超聂鲁燕刘宝凤胡勇张志刚
Owner TIANJIN NAVIGATION INSTR RES INST
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