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High-precision dynamic calibration method applied to quartz flexible accelerometer

An accelerometer and calibration technology, which is applied in the testing/calibration of speed/acceleration/shock measurement equipment, speed/acceleration/shock measurement, and measurement devices, etc. It can solve the problem of large relative errors in time domain intervals and unsatisfactory calibration accuracy, etc. problems, to achieve the effect of ensuring measurement accuracy

Active Publication Date: 2014-12-24
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology

However, through actual operation, it is found that the relative error of dynamic calibration in the time domain interval is relatively large, and the calibration accuracy is not ideal

Method used

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  • High-precision dynamic calibration method applied to quartz flexible accelerometer
  • High-precision dynamic calibration method applied to quartz flexible accelerometer
  • High-precision dynamic calibration method applied to quartz flexible accelerometer

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the drawings and embodiments.

[0033] The specific implementation steps of the high-precision dynamic calibration method of the quartz flexible accelerometer of the present invention are as follows:

[0034] Step 1, such as figure 1 As shown, the quartz flexible accelerometer is installed on a standard low-frequency vibration excitation platform so that its sensitive axis direction is parallel to the vibration direction.

[0035] Step 2. The standard low-frequency vibration excitation table sequentially generates sinusoidal vibrations of specific frequency and amplitude. The vibration frequencies are 1Hz, 2Hz, 5Hz, 10Hz, 20Hz, 30Hz, 40Hz, 60Hz, 80Hz, 100Hz, 120Hz, which are generated at the same vibration frequency At least 5 different vibration amplitudes, different vibration frequencies and different vibration amplitudes constitute different working conditions; the vibration amplitudes are randomly s...

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Abstract

The invention discloses a high-precision dynamic calibration method applied to a quartz flexible accelerometer. The method comprises the steps that sinusoidal vibrational excitations with different frequencies and different amplitudes are applied to the quartz flexible accelerometer, and a dynamic calibration function of a frequency domain is obtained by conducting FFT and least square method curve fitting on an accelerometer analog voltage amplitude frequency domain sequence obtained through measurement; the FFT is carried out on acceleration analog signals obtained through measurement during a test, then a dynamic calibration function is adopted for correction, the IFFT operation is carried out after correction is carried out, and finally calibrated and measured acceleration time domain data can be obtained. According to the high-precision dynamic calibration method, dynamic amplitude-frequency response characteristic calibration is carried out on the quartz flexible accelerometer, non-linear errors can be corrected, and the high-precision dynamic calibration method is effective and can achieve the purpose that the measurement precision of the quartz flexible accelerometer within the frequency range is ensured.

Description

Technical field [0001] The invention relates to the technical field of non-electricity metering and testing, in particular to a high-precision dynamic calibration method applied to a quartz flexible accelerometer. Background technique [0002] The quartz flexible accelerometer has the advantages of good low-frequency characteristics and good linearity, and is the preferred sensor for measuring low-frequency acceleration. As a sensitive element, quartz flexible accelerometers are mostly used in the aerospace field to measure the attitude of aircraft. The measurement frequency (generally only a few hertz) is low, and static calibration factors can be used. The resonant frequency of the quartz flexible accelerometer (JBN-3 type of the 33 Institute of Aerospace and the MQA type of the 230 factory of the 13 Institute of Aerospace) is generally 400Hz~600Hz. Usually, a high-precision indexing table is used to measure the flexural acceleration of quartz by gravity. The meter is calibrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/00
Inventor 赵伟王海明李云鹏霍红庆徐文林雷军刚高青松
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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