Magneto-optical method for measuring mechanical quantities

Author

Didosyan, Yuri ; Hauser, Hans ; Nicolics, Johann ; Hanreich, Gernot ; Wolfmayr, Holger

Author_Institution

Inst. of Ind. Electron. & Material Sci., Vienna Univ. of Technol., Austria

Volume

51

Issue

4

fYear

2002

fDate

8/1/2002 12:00:00 AM

Firstpage

730

Lastpage

733

Abstract

The progress of many optical methods for measuring geometrical quantities is restricted because of a lack of appropriate light detection techniques. Existing photodetectors-charge-coupled devices and position sensitive detectors-do not comply with the demand of high spatial accuracy combined with high sampling rates. In this paper a magneto-optical method for measuring the positions of light beams is described. It is based on spatial light modulation produced by domain wall motion in an orthoferrite crystal. The presented method provides a measurement accuracy of 0.8 μm and a sampling time of about 1 μs.

Keywords

Faraday effect; displacement measurement; ferrite devices; ferrites; magneto-optical modulation; magneto-optical sensors; mechanical variables measurement; spatial light modulators; yttrium compounds; Faraday rotation; YFeO₃; canted ferromagnets; displacement measurement; domain wall motion; light beam position measurement; magneto-optical method; measurement accuracy; mechanical quantities measurement; orthoferrite crystal; photocurrent curves; rotating polarizer; spatial light modulation; Displacement measurement; Electromagnetic measurements; Magnetooptic effects; Magnets; Mechanical variables measurement; Optical modulation; Optical sensors; Position measurement; Rotation measurement; Sampling methods;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2002.803291

Filename

1044716