An Absolute Displacement Sensor Using Moire Fringe Techniques With Multimode Optical Fibres

Barry E. Jones; Graeme S. Philp

doi:10.1117/12.946241

22 August 1985 An Absolute Displacement Sensor Using Moire Fringe Techniques With Multimode Optical Fibres

Barry E. Jones, Graeme S. Philp

Proceedings Volume 0522, Fibre Optics '85; (1985) https://doi.org/10.1117/12.946241
Event: Sira/Fibre Optics '85, 1985, London, United Kingdom

Abstract

The feasibility of the use of optical fibres to supply light to, and relay information from, an absolute moire fringe displacement sensor has been demonstrated and a prototype built. Fringe interpolation techniques are employed which reduce the susceptibility of the sensor to adventitious intensity fluctuations. The system is designed to operate over a displacement range of 100 μm and can resolve displacements down to 12 nm: nonlinearity is ±0.8 μm, while hysteresis and repeatability are better than 0.3 μm. The system is largely immune to intensity variations on the input light channel, however differential attenuation between any of the four return light channels more seriously affects the measurement. In order to try and avoid this problem an optical arrangement has been investigated in which intensity information corresponding to four quadrature points on the moire-fringe profile is carried in a single return optical fibre using wavelength separation.

Citation Download Citation

Barry E. Jones and Graeme S. Philp "An Absolute Displacement Sensor Using Moire Fringe Techniques With Multimode Optical Fibres", Proc. SPIE 0522, Fibre Optics '85, (22 August 1985); https://doi.org/10.1117/12.946241

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available