Improved position and velocity encoder resolution using an electro-optic beam scanner

William C. Messner; Tuviah E. Schlesinger; Daniel D. Stancil

doi:10.1117/12.351646

2 July 1999 Improved position and velocity encoder resolution using an electro-optic beam scanner

William C. Messner, Tuviah E. Schlesinger, Daniel D. Stancil

Proceedings Volume 3787, Optical Scanning: Design and Application; (1999) https://doi.org/10.1117/12.351646
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Optical encoders are the most common means for measuring linear or rotary position. A photodetector senses the occlusion, reflection, or diffraction of light by a structure that moves linearly or rotates relative to a fixed light source. Counting the switching between `on' and `off' gives a measure of position, and velocity is determined through numerical differentiation. This paper proposes the use of an electrooptic beam scanner to improve the accuracy of the detection of both position and velocity, by scanning the light source across the moving structure and comparing the phase of the photodetector signal to the phase of the scan. The Doppler effect between the forward and backward scan can provide velocity information without numerical differentiation. A simple experiment for detecting the position of a razor edge demonstrates the concept for position.

Citation Download Citation

William C. Messner, Tuviah E. Schlesinger, and Daniel D. Stancil "Improved position and velocity encoder resolution using an electro-optic beam scanner", Proc. SPIE 3787, Optical Scanning: Design and Application, (2 July 1999); https://doi.org/10.1117/12.351646

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Scanners

Electro optics

Computer programming

Sensors

Photodetectors

Diffraction gratings

Light sources

Show All Keywords

Keywords/Phrases

Search In:

Publication Years