Measurement of sub-surface delaminations in carbon fibre composites using high-speed phase-shifted speckle interferometry and temporal phase unwrapping

被引：12

作者：

Davila, A

Ruiz, PD

Kaufmann, GH

Huntley, JM

机构：

[1] Univ Nacl Rosario, Inst Fis Rosario, CONICET, Rosario, Argentina

[2] Loughborough Univ Technol, Wolfson Sch Mech & Mfg Engn, Loughborough LE11 3TU, Leics, England

[3] Univ Nacl Rosario, Fac Ciencias Exactas Ingn & Agrimensura, Dept Fis, Rosario, Argentina

来源：

OPTICS AND LASERS IN ENGINEERING | 2003年 / 40卷 / 5-6期

基金：

英国工程与自然科学研究理事会;

关键词：

speckle interferometry; phase shifting; phase measurement; phase unwrapping; optical metrology;

D O I：

10.1016/S0143-8166(02)00082-9

中图分类号：

O43 [光学];

学科分类号：

070207 [光学]; 0803 [光学工程];

摘要：

A high-speed phase-shifted speckle interferometer has been developed recently for studying dynamic events. Speckle interferograms are continuously recorded by a CCD camera operating at 1 kHz with temporal phase shifting carried out by a Pockels cell running at the same frequency. Temporal phase unwrapping through sequences of more than 1000 frames allows the determination of time-varying absolute displacement maps. This paper presents the application of this speckle interferometry system to the detection and measurement of sub-surface delamination defects in carbon fibre specimens. The influence of re-referencing the temporal phase unwrapping algorithm after different time intervals is analysed to reduce the random phase errors produced by speckle decorrelation and vibration. The performance of several phase-shifting algorithms to minimize the influence of the vibration noise caused by the vacuum pump used to load the specimen is also investigated. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：447 / 458

页数：12

共 10 条

[1]

Butters J. N., 1971, Optics and Laser Technology, V3, P26, DOI 10.1016/S0030-3992(71)80007-5

[2]

DERIVATION OF ALGORITHMS FOR PHASE-SHIFTING INTERFEROMETRY USING THE CONCEPT OF A DATA-SAMPLING WINDOW [J].