Dual-laser vibrometry: Elimination or extraction of pseudo vibration

M. L. Jakobsen; M. J. Bækbo; S. G. Hanson

doi:10.1117/12.2052176

15 May 2014 Dual-laser vibrometry: Elimination or extraction of pseudo vibration

M. L. Jakobsen, M. J. Bækbo, S. G. Hanson

Proceedings Volume 9141, Optical Sensing and Detection III; 91411G (2014) https://doi.org/10.1117/12.2052176
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

This paper investigates the principal idea of a method using two identical laser vibrometers to eliminate pseudo vibrations, occurring as structured noise in laser-vibrometer measurements of angular velocity of a rotating object. The two vibrometers monitor the same surface path on the rotating object, but are separated by a well specified angle. Thus, they are aligned in such a way that they observe the same speckle patterns, but with a relatively time lag given by the angular separation of the vibrometers and the angular velocity of the object. However, any physical variations in angular velocity of the object occur simultaneously at the two vibrometers. Knowing the angular separation between the vibrometers, simple trigonometry can be used to eliminate the pseudo vibrations. These vibrometers are based on cameras, therefore the experiments demonstrate the principle of the method only, and no real time measurements are obtained here.

Citation Download Citation

M. L. Jakobsen, M. J. Bækbo, and S. G. Hanson "Dual-laser vibrometry: Elimination or extraction of pseudo vibration", Proc. SPIE 9141, Optical Sensing and Detection III, 91411G (15 May 2014); https://doi.org/10.1117/12.2052176

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