Optical strain sensor using position-sensitive detector and diffraction grating: error analysis

Anand Krishna Asundi; Bing Zhao

doi:10.1117/1.602541

1 June 2000 Optical strain sensor using position-sensitive detector and diffraction grating: error analysis

Anand Krishna Asundi, Bing Zhao

Optical Engineering, Vol. 39, Issue 6, (June 2000). https://doi.org/10.1117/1.602541

A new optical strain sensor is developed to rival the traditional electrical strain gauge. It directly measures in-plane strains using a high frequency grating and two position-sensitive detectors (PSDs). The strain measurement is independent of the rigid body motion of the grating. A high frequency diffraction grating attached to the surface of a specimen is illuminated by a focused or collimated laser beam. The centroids of the two symmetric diffracted beam spots from the grating are determined by the PSD sensors connected to a personal computer. The shift of diffracted beam spots due to the specimen deformation is transformed to strain components. Several measures are taken to improve strain sensitivity including residual strain error due to the misalignment of laser and grating. The measured strain is directly displayed on the monitor in both digital and graphical forms in real time. Strain sensitivity of 1 x strain and a spatial resolution of 0.1 mm can be achieved.

Citation Download Citation

Anand Krishna Asundi and Bing Zhao "Optical strain sensor using position-sensitive detector and diffraction grating: error analysis," Optical Engineering 39(6), (1 June 2000). https://doi.org/10.1117/1.602541

Published: 1 June 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