Calibration System for Angular Vibration Using Precision Rotary Encoder

Seunghwan Nam; Kyungmin* Baik; Wan-Sup*† Cheung

doi:10.7776/ASK.2014.33.1.031

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2014 Vol.33, Issue 1 Preview Page Next Page

Calibration System for Angular Vibration Using Precision Rotary Encoder 고정밀 회전엔코더를 이용한 회전진동 교정시스템

31 January 2014. pp. 31-39

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Abstract

In this paper, two calibration methods for angular vibration pickups using a precision rotary encoder are proposed. The KRISS (Korea Research Institute of Standards and Science) primary angular vibration calibration system and the calibration procedures are briefly explained. The rotary encoder is shown to be calibrated in two methods: The one is to use the laser interferometer to calibrate the rotary encoder under test and the other is to exploit the certificate of the encoder supplied. Complex sensitivities measured from the first are shown to be less than 0.1 % difference in magnitude and 0.01° difference in phase shift in reference to those of the primary calibration system. Their expanded uncertainties were observed to be less than 0.6 % in magnitude and 0.4° in phase shift over the range of 0.4 to 200 Hz. Under the same calibration conditions, complex sensitivities evaluated by the second method are shown be 0.1 % difference in magnitude and 0.6° difference in phase shift in reference to those of the primary calibration system. Their expanded uncertainties were seen to be less than 4.8 % in magnitude and 2.8° in phase shift.

Keywords

Angular accelerometer calibration

Angular vibration

Angular vibration pickups

Rotary encoder

Measurement uncertainty

본 논문은 고정밀 회전엔코더를 이용한 회전진동 교정시스템의 실현방안을 제안한다. 제안된 시스템과 비교를 위해 한국표준과학연구원의 회전진동 절대교정시스템을 소개하며 회전진동 센서의 교정을 위한 장치와 측정 불확도 모델을 각각 제시한다. 제안된 방법은 회전엔코더의 교정방법에 따라 두 가지 로 나뉘는데 첫 번째는 레이저 간섭계를 이용하여 교정된 엔코더를 사용하는 방법이고, 두 번째는 제조사가 제공하는 성적서를 이용하여 교정 불확도를 평가하는 방법이다. 0.4 ~ 200 Hz의 교정주파수 구간에서 각가속도계를 교정한 결과, 첫 번째 제안된 방법은 절대교정시스템을 기준으로 감도 차이가 0.1 % 그리고 위상 차이는 0.01°이내였으며 최대 확장불확도 진폭은 0.6 % 그리고 위상 은 0.4° 이었다. 두 번째 제안된 방법은 절대교정시스템을 기준으로 감도차이가 진폭은 0.1 % 그리고 위상차이는 0.6° 이내였으며 최대 확장불확도는 진폭 4.8 % 와 위상 2.8°이었다.

키워드

회전진동

회전진동센서

회전엔코더

측정불확도

각가속도계 교정

References

1.ISO 16063 part 21, Methods for the calibration of vibration and shock transducers: Vibration calibration by comparison to a reference transducer, 2001.

2.ISO 16063 part 15, Methods for the calibration of vibration and shock transducers: Primary angular vibration calibration by laser interferometry, 2006.

3.S. Nam, Y. Lee and W. Cheung “Method of calibrating charge amplifier using a dynamic spectrum analyzer,” IMEKO 20th Congress, TC22, (2012).

4.H. Martens, “Dynamic cailbration of rotational transducers by diffraction grating interferometry,” PTB Mitt. 103, 19-26 (1992).

5.W. Cheung and T. Licht, “Progress in development of calibration systems for angular vibration pickups,” IMEKO 19th Congress, TC22, (2009).

6.W. Cheung and C. Chung, “Angle prism-based laser interferometer for high precision measurement of angular vibration,” IMEKO 18th Congress, TC22, (2006).

7.W. Cheung “Improved features of angular vibration exciters,” IMEKO 20th Congress, TC22, (2012).

8.W. Cheung, “Primary calibration procedure of angular vibration transducers,” KRISS., Tech. Rep., 2011.

9.A. Ellin, and G. Dolsak. “The design and application of rotary encoders.” Sens Rev. 28, 150-158 (2008).

10.J. Bendat and A. Piersol, Random Data (WILEY Publication, INC., 2010), pp. 102-105.

Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 33
No :1
Pages :31-39
Received Date : 2013-06-26
Revised Date : 2013-10-01
Accepted Date : 2013-10-30
DOI :https://doi.org/10.7776/ASK.2014.33.1.031

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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