By Topic

Noise-Modulated Optomechatronic Distance-Measuring System

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Baetz, W. ; Inst. of Meas. & Autom., Univ. of Kassel, Germany ; Braasch, J. ; Holzapfel, Wolfgang

A novel measuring system for optical distance sensing of solid targets is described. The system simply applies a noise-frequency-modulated laser diode for illuminating the target and an interferometer/photodetector device for coherent beam detection. This configuration is treated here as an optomechatronic correlator. The delay in travel time of the target beam in the interferometer yields a stochastically modulated electrical beat frequency in the photodetector output. Its mean frequency value is a measure for the target distance. Additionally to the required stochastic modulation of the injection current, the natural phase noise modulation of the laser diode also has to be taken into account. Theory delivers nonlinear measurement characteristics with strongly increased slope at the short-distance range. The experimental verification in a distance range up to 4 m shows a relative distance measurement error from \hbox {10^-3} to \hbox {10$^{-2}$ (1$\sigma$)} for an averaging time range from 10 to 1 s. The system is potentially qualified for approach sensing in mechatronic devices like tool machinery and robotics.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:52 ,  Issue: 4 )