Measurement of Two-Dimensional Small Angles Based on Interference Fringes

Author

Wang, Xuanze ; Cao, Hongduan ; Zhai, Zhongsheng

Author_Institution

Sch. of Mech. Eng., HuBei Univ. of Technol., Wuhan, China

fYear

2009

fDate

17-19 Oct. 2009

Firstpage

1

Lastpage

5

Abstract

A novel two-dimensional small angles measurement is introduced, which is based on the relation between the interference fringes shape (direction and width) and the angle contained by two lights of Michelson interferometer, and utilizes quadrant Si-photoelectric detector (QPD) as detection device. The status of interference fringes changes from static to dynamic, with modulating the wavelength of the laser-diode (LD) by sawtooth modulation. To ensure that while LD is shining, the change of the wavelength of the LD is linear, this paper adopted sawtooth modulation signal (500 Hz) with a DC offset. Using High Speed A/D Convert Card (250 K) and software to collect analogue signal, and data processing technique to got the swing angle. The test precision is 0.05"calculated by experiment data.

Keywords

Michelson interferometers; angular measurement; interference (signal); photoelectric devices; semiconductor lasers; waveform generators; 2D small angles measurement; DC offset; Michelson interferometer; data processing; frequency 500 Hz; high speed A/D convert card; interference fringes; laser-diode sawtooth modulation; quadrant photoelectric detector; static to dynamic; swing angle; Goniometers; Interference; Mechanical variables measurement; Mirrors; Optical interferometry; Optical reflection; Ring lasers; Shape measurement; Spectroscopy; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Image and Signal Processing, 2009. CISP '09. 2nd International Congress on

Conference_Location

Tianjin

Print_ISBN

978-1-4244-4129-7

Electronic_ISBN

978-1-4244-4131-0

Type

conf

DOI

10.1109/CISP.2009.5304842

Filename

5304842