Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

Absolute and dynamic position and shape measurement of fast moving objects employing novel laser Doppler techniques

[+] Author Affiliations
Thorsten Pfister, Philipp Günther, Lars Büttner, Jürgen Czarske

Technische Univ. Dresden (Germany)

Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 715513 (October 03, 2008); doi:10.1117/12.814539
Text Size: A A A
From Conference Volume 7155

  • Ninth International Symposium on Laser Metrology
  • Chenggen Quan; Anand Asundi
  • Unknown, Singapore | June 30, 2008

abstract

In this contribution a novel laser Doppler distance (LDD) sensor is presented, which allows simultaneous measurement of axial position and tangential velocity and, thus, determination of the shape of moving and especially rotating objects with one single sensor. Conventional laser Doppler velocimeters measure only velocities. A concurrent position measurement can be realized by generating two fan-shaped interference fringe systems with contrary fringe spacing gradients and evaluating the quotient of the two resulting Doppler frequencies. Alternatively, two tilted fringe systems in combination with phase evaluation can be employed. It will be shown that, in contrast to conventional distance sensors, high temporal resolution below 3 μs and high position resolution of about 1 μm can be achieved simultaneously, because the position uncertainty of the LDD sensor is in principle independent of the object velocity. This is advantageous especially for monitoring highly dynamic processes e.g. at turbo machines, where in-process measurements of tip clearance and rotor vibrations are reported for up to 600 m/s blade tip velocity.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Thorsten Pfister ; Philipp Günther ; Lars Büttner and Jürgen Czarske
"Absolute and dynamic position and shape measurement of fast moving objects employing novel laser Doppler techniques", Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 715513 (October 03, 2008); doi:10.1117/12.814539; http://dx.doi.org/10.1117/12.814539


Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.