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Showing papers by "Pietro Ferraro published in 2002"


Journal ArticleDOI
TL;DR: In this paper, the authors reviewed the achievements about the fiber Bragg gratings (FBG) as a strain and temperature sensor and described the potential applications of FBG sensors for applications in the field of geophysics and its expected development in the near future.

125 citations


Journal ArticleDOI
TL;DR: In this paper, a phase-shifting Mach-Zehnder interferometer is used for recording four-quadrature phase shifted off-axis holograms with a CCD camera.

93 citations


Proceedings ArticleDOI
07 Nov 2002
TL;DR: Digital holography is proposed as a non-contact method for the inspection and characterization of MEMS and can be useful for assessing the fabrication process and the functionality as well as the reliability of micromachined structures.
Abstract: Digital holography is proposed as a non-contact method for the inspection and characterization of MEMS. The method can be useful for assessing the fabrication process and the functionality as well as the reliability of micromachined structures.

33 citations


Journal ArticleDOI
TL;DR: In this article, a new interferometric technique for measuring the ordinary and extraordinary refractive indices of uniaxial crystals was proposed based on the measurement of the rotation-dependent phase changes of the optical path length in crystal plates.

21 citations


Journal ArticleDOI
TL;DR: This work proposes a RGI with a different optical configuration that includes a lateral shearing in addition to folding and reversal operations that becomes sensitive to other terms of third-order aberrations such as defocusing, astigmatism, and spherical aberration.
Abstract: The reflecting grating interferometer (RGI) is a folded and reversal wave-front interferometer sensitive only to asymmetrical aberrations such as third-order coma. The RGI can isolate and evaluate coma both in nearly collimated and in noncollimated beams. We propose a RGI with a different optical configuration that includes a lateral shearing in addition to folding and reversal operations. With lateral shear, the RGI also becomes sensitive to other terms of third-order aberrations such as defocusing, astigmatism, and spherical aberration. Optical path difference equations for interpreting interferograms and numerical simulations are presented to show how the interferometer works in the shearing configuration. Its potential applications are described and discussed.

12 citations


Proceedings ArticleDOI
18 Feb 2002
TL;DR: In this article, a phase-shifting Mach-Zehnder interferometer is used for recording four-quadrature phase shifted off-axis holograms, which can be further enhanced by digital compensation of the aberrations introduced by the holographic recording system.
Abstract: Off-axis holograms recorded with a CCD camera are numerically reconstructed in amplitude by calculating through the Fresnel-Kirchhoff integral. A phase-shifting Mach-Zehnder interferometer is used for recording four- quadrature phase-shifted off-axis holograms. The basic principle of this technique and its experimental verification are described. We show that the application of this algorithm allows for the suppression of the zero order of diffraction and of the twin image and that the contrast of the reconstructed images can be further enhanced by digital compensation of the aberrations introduced by the holographic recording system.

3 citations


Journal ArticleDOI
TL;DR: The Web of Science Record was created on 2007-06-13, modified on 2016-08-08 as mentioned in this paper, and was updated on 2017-07-08, with the same authors.

3 citations


Proceedings ArticleDOI
10 Nov 2002
TL;DR: In this paper, a simple method for interrogating fiber Bragg grating sensors by a bi-polished silicon sample acting like a Fabry-Perot filter was described.
Abstract: Describes a simple method for interrogating fiber Bragg grating sensors by a bi-polished silicon sample acting like a Fabry-Perot filter. Thus, Bragg wavelength shift is converted into a variation of the light intensity.

2 citations