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| Calibrate of Ultra-low Frequency Acceleration by Mathematical Pendulum-vibration Generator Method |
| HE Yi-cai,LIAO Jian-ping,ZHAO Jun-zhe |
| Changcheng Institute of Metrology & Measurement, Beijing 100095, China |
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Abstract The calibration device of ultra-low frequency acceleration is established based on the mathematical pendulum-vibration generator. According to theory of low frequency noise, based on the spectral density function of laser interferometer, the method of quantitative evaluation for displacement noise is proposed. The validity of the proposed method is identified by experiment. The virtual pendulum-arm and excitation-transfer coefficient of mathematical pendulum-vibration generator is measured experimentally, the measurement uncertainty of the calibration device is evaluated. The accelerometers calibration of absolute method is realized, which is established in 0.001～0.1Hz frequency range, 5×10-7 ～0.01m/s2 acceleration range.
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Received: 10 February 2017
Published: 16 June 2017
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2017, Vol. 38 
