Double Imaging Mach–Zehnder Spatial Carrier Digital Shearography

Gao, Xinya; Wang, Yonghong; Dan, Xizuo; Sia, Bernard; Yang, Lianxiang

doi:10.1080/09500340.2018.1513173

Cited by 13 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is a research hotspot to combine the two techniques appropriately to develop a multiplexed system that can measure the out-of-plane deformation and its slope simultaneously. [10][11][12][13][14] The multiplexed system of DSPI and DS was first proposed by Bhaduri et al [15][16][17] They designed a state-of-art mask to separate the frequencies of the out-of-plane deformation and its slope. Therefore, different phase maps can be extracted from one image.…”

Section: Introductionmentioning

confidence: 99%

New multiplexed system for synchronous measurement of out-of-plane deformation and two orthogonal slopes

Wang¹,

Zhang²,

Zhao³

et al. 2022

Chinese Phys. B

Self Cite

View full text Add to dashboard Cite

We propose a novel system for synchronous measurement of out-of-plane deformation and two orthogonal slopes using a single camera. The linearly polarized reference beam introduced by an optical fiber interferes with the unpolarized object beam to measure the out-of-plane deformation. A modified Mach–Zehnder interferometer is used to measure the two orthogonal slopes of the out-of-plane deformation. One of the object beams of the Mach–Zehnder interferometer is an unpolarized beam, and the other object beam is split into two orthogonal linearly polarized object beams by a polarizing prism. The two beams are orthogonally polarized. Hence, they will not interfere with each other. The two polarized beams respectively interfere with the unpolarized beam to simultaneously measure the two orthogonal slopes of the out-of-plane deformation. In addition, the imaging lens and apertures are respectively placed in three optical paths to independently control the carrier frequencies and shearing amounts. The effectiveness of this method can be proved by measuring two pressure-loaded circular plates.

show abstract

Section: Introductionmentioning

confidence: 99%

New multiplexed system for synchronous measurement of out-of-plane deformation and two orthogonal slopes

Wang¹,

Zhang²,

Zhao³

et al. 2022

Chinese Phys. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…In two spatial phase-shifting shearography techniques—Mach–Zehnder interferometer-based [14,16] and Michelson interferometer-based [5,17]—the spatial carrier frequency is generated by the tilt angle between the two sheared images. However, both carrier frequency and shearing amount are introduced by the tilting angle, with the result that these shearography techniques can work only within certain thresholds of shearing [18]. A carrier frequency can also be generated by using multiple apertures and adjusting their distances, which allows independent adjustment of shearing amount and spatial carrier frequency [18,19,20,21,22].…”

Section: Introductionmentioning

confidence: 99%

“…However, both carrier frequency and shearing amount are introduced by the tilting angle, with the result that these shearography techniques can work only within certain thresholds of shearing [18]. A carrier frequency can also be generated by using multiple apertures and adjusting their distances, which allows independent adjustment of shearing amount and spatial carrier frequency [18,19,20,21,22]. For the above spatial carrier shearography, the carrier phase is linear.…”

Section: Introductionmentioning

confidence: 99%

Pixelated Carrier Phase-Shifting Shearography Using Spatiotemporal Low-Pass Filtering Algorithm

Yan

Liu

et al. 2019

Sensors

Self Cite

View full text Add to dashboard Cite

Shearography has been widely used in non-destructive testing due to its advantages in providing full-field, high precision, real-time measurement. The study presents a pixelated carrier phase-shifting shearography using a pixelated micropolarizer array. Based on the shearography, a series of shearograms are captured and phase maps corresponding to deformation are measured dynamically and continuously. Using the proposed spatiotemporal filtering algorithm in the complex domain, the set of phase maps are simultaneously low-pass filtered in the spatial and temporal domains, resulting in better phase quality than spatial low-pass filtering. By accumulating the temporally adjacent phase, the phase corresponding to large deformation can be evaluated; thus, large deformations can be accurately measured and protected from speckle noise, allowing internal defects to be easily identified. The capability of the proposed shearography is described by theoretical discussions and experiments.

show abstract

“…The new configuration of the shearography instrument realises measurements of the in-and out-of-plane surface strain components during the impact using the double frame approach and a double imaging Mach-Zehnder interferometer 11,12 . The main criteria for the continuation of the development were derived by maximising the value of the expected results for the validation of numerical models -to measure both in-and out-of-plane surface strain components at impact speeds up to 200 m/s with a temporal resolution up to sub-μs over the field of view of 100×100 mm.…”

Section: Introductionmentioning

confidence: 99%

EXTREME shearography: high-speed shearography instrument for in-plane surface strain measurements during an impact event

Anisimov¹,

Groves

2019

Optical Measurement Systems for Industrial Inspection XI

View full text Add to dashboard Cite

This work presents the design and the latest experimental results on the surface strain measurements during an impact event obtained with the EXTREME high-speed shearography instrument. The shearography technique is used in this project to provide a quantitative measurement of the surface strain development at the first moments of the impact event (μs time scale) which may reveal the initiation of the failure mechanisms in composite materials. Experimentally measured surface strain components over the field of view will be used as input and validation data for new numerical and analytical models of the impact response of composites. The new configuration of the shearography instrument realises measurements of the in-and out-of-plane surface strain components to improve coupling with the numerical models. Two viewing directions (shearing interferometers) with a double-frame approach are used to capture the interferograms during the impact. The interferometers realise a double-imaging Mach-Zehnder scheme for the spatial phase-shifting with independent control of the shearing amount and the carrier frequency. The set of technical parameters of the developed shearography instrument makes it one of the most extreme applications of shearography for material characterisation. The framework for this work is the "EXTREME Dynamic Loading -Pushing the Boundaries of Aerospace Composite Material Structures" Horizon 2020 project.

show abstract

Double Imaging Mach–Zehnder Spatial Carrier Digital Shearography

Cited by 13 publications

References 21 publications

New multiplexed system for synchronous measurement of out-of-plane deformation and two orthogonal slopes

New multiplexed system for synchronous measurement of out-of-plane deformation and two orthogonal slopes

Pixelated Carrier Phase-Shifting Shearography Using Spatiotemporal Low-Pass Filtering Algorithm

EXTREME shearography: high-speed shearography instrument for in-plane surface strain measurements during an impact event

Contact Info

Product

Resources

About