An electronic speckle pattern interferometer for two-dimensional strain measurement

Moore, Andrew J.; Lucas, Margaret; Tyrer, John R.

doi:10.1088/0957-0233/7/12/008

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…3 shows the principle of the wireless signal acquiring system developed in this paper. Strain rosettes were pasted at relevant positions inside the friction drum and on the main shaft to realize stress measurement [7][8][9]. Strain signals were transmitted by the wireless signal collector, then received by the wireless receiver, and finally reached the industrial PC through network cables.…”

Section: Test Rigmentioning

confidence: 99%

Vibration modal shapes and strain measurement of the main shaft assembly of a friction hoist

Ma¹,

Zhang²,

Bao³

et al. 2017

J. vibroeng.

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In order to evaluate the reliability of the main shaft unit of a friction hoisting system, strain measurement is a significant method. In this paper, a test rig of a friction hoisting system was built, which could applied periodically changing load on its main shaft unit; The mechanical analysis under the test load was conducted and the boundary limits were obtained; A three dimensional model of the main shaft unit was built in Pro-E and its finite element analysis was performed in ANSYS; With the analytical result, measuring points for strain rosettes were initially selected; Vibration modal shapes of the main shaft unit were analyzed, based on which Modal Assurance Criterion (MAC) was utilized in the Particle Swarm Optimization (PSO) algorithm to make the final decision of the number and positions of the measuring points; A wireless measurement system was developed to acquire strain signals from the optimized measuring positions; The test result verified the efficiency of the methods employed in this paper and revealed how strain of the main shaft unit changes during running process.

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Section: Test Rigmentioning

confidence: 99%

Vibration modal shapes and strain measurement of the main shaft assembly of a friction hoist

Ma¹,

Zhang²,

Bao³

et al. 2017

J. vibroeng.

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show abstract

“…By launching the symmetrical illuminating beams from two perpendicular planes, he was able to perform a twodimensional measurement. Moore et al [8] applied ESPI for measuring two-dimensional strain. Their technique improves on others by performing a simultaneous and automatic calculation of the two-dimensional stress.…”

Section: Introductionmentioning

confidence: 99%

An ESPI system for determining in-plane deformations. Three-dimensional analysis of the carrier fringes and a proposal for analysis of transient in-plane deformations

Hurtado-Ramos

Blanco-García

Fernández

et al. 2001

Meas. Sci. Technol.

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In this work we report results on analysis of in-plane deformation using the symmetrical illumination technique. A single illumination source is doubled by means of a mirror placed perpendicular to the object being tested. Carrier fringes are introduced by displacing the symmetrical sources (one of which is virtual), a technique often used in contouring. We present a three-dimensional theoretical model for the generation of the carrier fringes and analyse the basic concepts of this model. Experimental results obtained using a cw laser are also presented. These results and the ones obtained by applying this technique to out-of-plane and shearing systems are the basis for proposing the application of the concept to analysis of in-plane transient deformation using a double cavity Nd:YAG laser. A convenient set-up for that purpose is described.

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Whole-field strain measurement in a pin-loaded plate by electronic speckle pattern interferometry and the finite element method

Scalea

Hong

Cloud

1998

Experimental Mechanics

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ABSTRACT--The strain field in an epoxy plate loaded in tension through a steel pin is determined using electronic speckle pattern interferometry (ESPI) and the finite element method (FEM). In a dual-beam illumination speckle interferometer, the in-plane component of the displacement at the plate's surface is accurately measured using a tour-step phase-shifting algorithm. Digital image processing algorithms have been developed for noise reduction and strain calculation directly in the computer from the phase map with a strain gage length of about 0.4 mm. A whole-field strain map is obtained, as well as distributions of strain concentration factor, in critical regions near the hore of the plate. FEM is used to perform a nonlinear contact analysis accounting for friction effects at the pinhole interface. The agreement between experimental results and numerical predictions is good. In terms of speed, accuracy and ease of use, dual-beam ESPI appears to be a superior method of whole-field strain analysis.

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An electronic speckle pattern interferometer for two-dimensional strain measurement

Cited by 5 publications

References 6 publications

Vibration modal shapes and strain measurement of the main shaft assembly of a friction hoist

Vibration modal shapes and strain measurement of the main shaft assembly of a friction hoist

An ESPI system for determining in-plane deformations. Three-dimensional analysis of the carrier fringes and a proposal for analysis of transient in-plane deformations

Whole-field strain measurement in a pin-loaded plate by electronic speckle pattern interferometry and the finite element method

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