Patent · US Expired

Method of improving the contrast of images obtained using the pulsed image-addition ESPI technique

US6362873B1 · kind B1 · utility

7Cited by
1References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 11, 2000
Grant dateMar 26, 2002
Priority date—
Expiry dateApr 11, 2020

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01B9/02095
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

To improve the contrast of images obtained using the pulsed image-addition ESPI technique relative to a mechanically stressed object, a preliminary measuring cycle is performed, with the object in the unstressed condition, to obtain a predetermined number of interference images (110-160) differing from one another by a controlled phase shift of a fraction of the pulses traveling along one of the branches of the interferometer; a mean luminous intensity value is calculated (170) from the interference images, is memorized (180), and is subtracted (220) from each of the interference images obtained during the actual measuring cycle to improve the contrast of the images.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.