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Accelerometer calibration method and device based on coherent light vision optical flow detection

A technology of accelerometer and coherent light, which is applied in the direction of measuring device, speed/acceleration/shock measurement, speed/acceleration/shock measurement equipment testing/calibration, etc., can solve problems such as limiting practicality, and achieve simple and low-cost implementation. The effect of low, high measurement accuracy

Active Publication Date: 2020-09-18
AEROSPACE INFORMATION RES INST CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods need to install targets on the measured accelerometer, which greatly limits their practicability.

Method used

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  • Accelerometer calibration method and device based on coherent light vision optical flow detection
  • Accelerometer calibration method and device based on coherent light vision optical flow detection
  • Accelerometer calibration method and device based on coherent light vision optical flow detection

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Experimental program
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Embodiment 1

[0079] see image 3 , the device mainly includes: a vibration table 3, a measured accelerometer 1, a camera 2, a small laser 4, and a host computer 5. The measured accelerometer 1 is fixed on the vibrating table 3, and the vibrating table 3 is used to provide test excitation motion for the measured accelerometer 1; the small laser 4 is used to generate coherent light; the camera 2 is used to obtain the scattered light on the surface of the measured accelerometer 1 spot image; the host computer 5 is used to process the calibration information and complete the calibration.

[0080] Step a: use the following parameters to complete the arrangement of the accelerometer calibration device in this embodiment: Sr=50mm, Fr=21mm, Amax=50mm, L3=45mm, L2=75mm, L1=425mm;

[0081] Step b: The small laser, the camera and the vibrating table are turned on at the same time, and the laser light emitted by the small laser is projected on the surface of the measured accelerometer for diffuse ref...

Embodiment 2

[0085] Figure 5 It is a schematic diagram of the device for implementing the method of the present invention. The device mainly includes: a circuit module 6, a measured accelerometer 1 embedded in the circuit module 6, a micro camera 2, a small laser 4, and a host computer 5. The measured accelerometer 1 is fixed on the circuit module 6, and the circuit module 6 is rigidly connected with the measured accelerometer 1; the small laser 4 is used to generate coherent light; the micro camera 2 is used to obtain the speckle image on the surface of the measured accelerometer 1; The upper computer 5 is used to process calibration information and complete calibration.

[0086] The calibration method in this embodiment mainly includes the following steps:

[0087] Step A: Use the following parameters to complete the arrangement of the accelerometer calibration device in this embodiment: Sr=5mm, Fr=3.096mm, Amax=30mm, L3=2mm, L2=2.1mm, L1=50mm:

[0088] Step B: Use the plumb method to...

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Abstract

The invention provides an accelerometer calibration method and device based on coherent light visual optical flow detection. The method comprises the steps that test coherent light is projected to thesurface of a tested accelerometer, so that the tested accelerometer is kept irradiated in the whole calibration process; a carrier connected with the tested accelerometer moves to drive the tested accelerometer to move, and a signal W0 is obtained through the tested accelerometer; meanwhile, an image sensor continuously acquires reflection speckles on the surface of the complete tested accelerometer to obtain a speckle image sequence; the speckle image sequence is processed to obtain vibration information of the tested accelerometer; the actual displacement of the tested accelerometer is obtained according to the vibration information, the signal W0 of the tested accelerometer is calibrated according to the actual displacement, and calibration is completed. The method is low in cost, simple in calibration process, more convenient to operate, high in measurement precision and wide in application range.

Description

technical field [0001] The invention relates to the field of accelerometer calibration, in particular to an accelerometer calibration method and device based on coherent optical vision optical flow detection. Background technique [0002] With the continuous development of inertial measurement technology, accelerometers are widely used in vehicle navigation, consumer electronics, industrial testing, facility monitoring and other fields as important sensor devices for motion and attitude perception. The performance of accelerometers is excellent. Inferiority will directly affect the final performance of the system on board. Due to the zero drift of the accelerometer, in practical applications, the user needs to calibrate the accelerometer after the accelerometer leaves the factory and before it is used, when the application environment and working conditions undergo major changes, and after long-term work. Ensure the validity and reliability of accelerometer measurement data...

Claims

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Application Information

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IPC IPC(8): G01P21/00
CPCG01P21/00
Inventor 李志天邹旭东熊兴崟杨伍昊汪政
Owner AEROSPACE INFORMATION RES INST CAS
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