Development of charge amplifier calibration system employing substitution method |
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| Takashi Usuda, Akihiro Oota, Hideaki Nozato, Tamio Ishigami, Yasuhiro Nakamura, and Katsuhisa Kudo |
- Abstract:
- Charge amplifier is a key device for vibration metrology as well as an accelerometer itself. Reliability of vibration measurement heavily depends on the stability and frequency characteristics of charge amplifier. Especially, phase characteristic of charge amplifier becomes more important as many calibration sectors have adopted Sin-approximation method which enables calibration of accelerometer phase shift.
In this paper, development of charge amplifier calibration system both for amplitude (gain) and phase is reported. The calibration system consists of standard capacitor, inductive voltage divider, injection transformer, and sine signal generator. Because the system does not contain any active device such as voltmeter or A/D converter which requests periodic calibration, it is quite stable and reliable without any maintenance including periodical calibration. The system enables calibration uncertainty of 1.3·10-3 % in gain and of 6·10-5 deg. in phase shift at 160 Hz. - Keywords:
- piezo-electric accelerometer, charge amplifier, calibration, phase-shift, sine approximation method
- Download:
- IMEKO-TC22-2007-KL-106u.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC22
- Event name:
- Cultivating metrological knowledge
- Title:
- 1st Conference on Vibration Measurement (together with 20th TC3 Conference on Measurement of Force, Mass and Torque & 3rd TC16 Conference on Pressure Measurement)
- Place:
- Merida, MEXICO
- Time:
- 27 November 2007 - 01 December 2007