Moire Topography With Large Contour Intervals

G. T. Reid; R. C. Rixon; H. Stewart

doi:10.1117/12.941713

17 February 1987 Moire Topography With Large Contour Intervals

G. T. Reid, R. C. Rixon, H. Stewart

Proceedings Volume 0814, Photomechanics and Speckle Metrology; (1987) https://doi.org/10.1117/12.941713
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

One of the widely recognised limitations of moire topography is its inability to provide unambiguous data from objects which have discontinuities in their shape. Similar limitations arise when two parts of an object are separated by a region which is in shadow. This feature of moire topography has limited its use to the measurement of objects which have continuous surfaces. With the development of phase measuring techniques for fringe pattern analysis, moire fringe contour patterns can now be analysed to high levels of accuracy, the contour interval being subdivided into, perhaps, 200 increments of measurement by the phase calculation procedure. This paper describes a modified version of moire topography in which the contour interval has been greatly increased so that, in some cases, the entire depth of the object lies within one fringe. By applying high accuracy phase measuring techniques to the analysis of these moire fringe patterns, sub-millimetre accuracy can be obtained in measurements of objects which would normally be thought of as unmeasurable by moire topography.

Citation Download Citation

G. T. Reid, R. C. Rixon, and H. Stewart "Moire Topography With Large Contour Intervals", Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); https://doi.org/10.1117/12.941713

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