Single‐Image Interferogram Demodulation

Servı́n, Manuel; Estrada, J. C.; Quiroga, Antonio

doi:10.1002/9783527633852.ch3

Cited by 2 publications

(2 citation statements)

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“…In recent years, some algorithms for the extraction phase values from one fringe pattern without spatial carrier were reported [ 53 – 57 ]. However, these algorithms are based on some assumptions and they may be working on some fringe patterns but fail on others.…”

Section: High-speed-imaging-based Idmmentioning

confidence: 99%

Interferometric Dynamic Measurement: Techniques Based on High-Speed Imaging or a Single Photodetector

Pedrini

2014

The Scientific World Journal

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In recent years, optical interferometry-based techniques have been widely used to perform noncontact measurement of dynamic deformation in different industrial areas. In these applications, various physical quantities need to be measured in any instant and the Nyquist sampling theorem has to be satisfied along the time axis on each measurement point. Two types of techniques were developed for such measurements: one is based on high-speed cameras and the other uses a single photodetector. The limitation of the measurement range along the time axis in camera-based technology is mainly due to the low capturing rate, while the photodetector-based technology can only do the measurement on a single point. In this paper, several aspects of these two technologies are discussed. For the camera-based interferometry, the discussion includes the introduction of the carrier, the processing of the recorded images, the phase extraction algorithms in various domains, and how to increase the temporal measurement range by using multiwavelength techniques. For the detector-based interferometry, the discussion mainly focuses on the single-point and multipoint laser Doppler vibrometers and their applications for measurement under extreme conditions. The results show the effort done by researchers for the improvement of the measurement capabilities using interferometry-based techniques to cover the requirements needed for the industrial applications.

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Section: High-speed-imaging-based Idmmentioning

confidence: 99%

Interferometric Dynamic Measurement: Techniques Based on High-Speed Imaging or a Single Photodetector

Pedrini

2014

The Scientific World Journal

View full text Add to dashboard Cite

show abstract

“…Demodulating open fringes can be made with a single fringe pattern using linear methods such as the Fourier transform method [3]. However, demodulating closed fringes is much more complex because we have a sign ambiguity to be solved [4][5][6]. This sign ambiguity is solved by the phase-shifting interferometry techniques [1].…”

Section: Introductionmentioning

confidence: 99%