Mapping of plaster detachments in historical murals by electronic speckle pattern interferometry (ESPI)

G. Gülker

doi:10.1117/12.2308808

23 July 1993 Mapping of plaster detachments in historical murals by electronic speckle pattern interferometry (ESPI)

G. Gülker

Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 1983AT (1993) https://doi.org/10.1117/12.2308808
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary

Abstract

Double spectral modulation is a new interferometric procedure which enables encoding the profile of a 2-D optical pupil z(x,y) in the wide, continuous spectrum of a light beam ( 1 ). The optical phase of such a beam depends both on the profile of the surface and on the light wavelength. Because of this the phase rate change could become zero ( stationary phase situation) at certain points where the surface gradient takes specific values and since knowledge of the direction of the phase increase is necessary for the phase - retrieving seeking process, reaching stationary phase points puts usually and end to it and hence to the finding of the surface z(x,y). In this paper we present a technique which overcomes this problem and so allows the obtention of the whole surface profile of a reflecting surface. The specimen being a reflecting surface takes the place of one of the mirrors in a Michelson interferometer and is illuminated by a wide, continuous-spectrum light source. At the plane of fringe localization the light intensity is related to the phase by

Citation Download Citation

G. Gülker "Mapping of plaster detachments in historical murals by electronic speckle pattern interferometry (ESPI)", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1983AT (23 July 1993); https://doi.org/10.1117/12.2308808

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