Interferometric measurements of displacement on a diffusing target by a speckle tracking technique

Author

Norgia, Michele ; Donati, Silvano ; Alessandro, Davide D.

Author_Institution

Dipartimento di Elettronica, Pavia Univ., Italy

Volume

37

Issue

6

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

800

Lastpage

806

Abstract

Operation of a laser interferometer with a noncooperative target surface, and on a substantial span of displacement (1 m), is reported for the first time to our knowledge. In the paper, we first analyze the errors of an interferometer operating in the speckle pattern regime, then propose the technique of tracking the speckle relative maximum amplitude as a solution for problems so far preventing interferometric measurements of large displacements. Examples of the speckle-statistics improvements are reported. Residual errors are of the order of few wavelengths on a 1-m displacement, indicating that a 10^-6-class instrument can be developed. The proposed approach has been implemented with an injection interferometer

Keywords

displacement measurement; light interferometry; light scattering; measurement errors; statistical analysis; 1 m; 10^-6-class instrument; diffusing target; displacement measurement; injection interferometer; interferometric measurements; large displacements; laser interferometer; noncooperative target surface; residual error; speckle pattern regime; speckle relative maximum amplitude; speckle tracking technique; speckle-statistics improvements; tracking; Displacement measurement; Dynamic range; Laser feedback; Optical feedback; Optical interferometry; Optical surface waves; Semiconductor lasers; Speckle; Target tracking; Wavelength measurement;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.922778

Filename

922778