Title:
APPARATUS AND METHOD FOR MEASURING ROTATIONAL SPEED OF ROTARY SHAFT BASED ON VARIABLE DENSITY SINUSOIDAL FRINGE
Document Type and Number:
WIPO Patent Application WO/2018/095213
Kind Code:
A1
Abstract:
An apparatus and method for measuring a rotational speed of a rotary shaft based on a variable density sinusoidal fringe. The apparatus comprises a variable density sinusoidal fringe sensor (5), a high-speed image collection module (3), a data transmission module (2), an image processing software module and a computer (1). The method comprises the following steps: attaching a variable density sinusoidal fringe sensor (5) to the circumferential surface of a rotary shaft (6) to be measured; a high-speed image collection module (3) performing continuous imaging and recording of a variable density fringe; a data transmission module (3) transmitting fringe images to a computer (1); and an image processing software module performing Fourier transform on fringe signals at a pixel position of the same line in each frame of the image and using a peak frequency correction method to accurately correct the peak frequency so as to obtain accurate fringe density information, then obtaining a time domain curve of the rotational angular speed of the rotary shaft attached with the fringe, and then calculating a rotational speed signal of the rotary shaft by means of the rotational angular speed and a sampling frequency of a camera.
Inventors:
ZHONG SHUNCONG (CN)
ZHONG JIANFENG (CN)
ZHANG QIUKUN (CN)
ZHONG JIANFENG (CN)
ZHANG QIUKUN (CN)
Application Number:
PCT/CN2017/109514
Publication Date:
May 31, 2018
Filing Date:
November 06, 2017
Export Citation:
Assignee:
UNIV FU ZHOU (CN)
International Classes:
G01P3/38; G06V10/22; G06V10/422
Foreign References:
| CN205642604U | 2016-10-12 | |||
| CN106443046A | 2017-02-22 | |||
| CN206583924U | 2017-10-24 | |||
| CN2410643Y | 2000-12-13 | |||
| CN105841620A | 2016-08-10 | |||
| CN201489014U | 2010-05-26 | |||
| US20160110628A1 | 2016-04-21 | |||
| CN101986103A | 2011-03-16 |
Attorney, Agent or Firm:
FUZHOU YUANCHUANG PATENT AND TRADEMARK AGENT LTD. (CN)
Download PDF: