Optimization of shape measurement system based on spatial light modulators

C. R. Coggrave; Jonathan Mark Huntley

doi:10.1117/1.602340

1 January 2000 Optimization of shape measurement system based on spatial light modulators

C. R. Coggrave, Jonathan Mark Huntley

Optical Engineering, Vol. 39, Issue 1, (January 2000). https://doi.org/10.1117/1.602340

We describe the results of an experimental study to optimize the measurement precision of a whole-field shape measurement system based on projected fringes produced by a spatial light modulator (SLM). Investigated issues include (1) the relative performance of different phase-shifting algorithms (4 frame, 7 frame, and 15 frame); (2) the relative performance of different temporal phase unwrapping algorithms (in particular, the reversed exponential and Fourier transform ranging methods); and (3) the effect of projector defocus. The last point is shown to be a crucial limiting factor in the performance of such systems. Focusing the projector within the measurement volume produces data with high systematic noise content due to the pixel structure of the SLM, whereas focusing the projector a long way beyond the measurement volume introduces significant random noise due to the reduced fringe modulation. At the optimum focal position, a measurement precision of better than 1 part in 20,000 of the field of view is achieved.

Citation Download Citation

C. R. Coggrave and Jonathan Mark Huntley "Optimization of shape measurement system based on spatial light modulators," Optical Engineering 39(1), (1 January 2000). https://doi.org/10.1117/1.602340

Published: 1 January 2000

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