A Novel Technique for Spatial Phase-shifting Interferometry

Servı́n, Manuel; Cuevas, Francisco Javier Panera

doi:10.1080/09500349514551621

Cited by 83 publications

(43 citation statements)

References 7 publications

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“…The general method has been improved in many ways, for example to compensate for nonideal acquisition devices and conditions. [29][30][31][32][33][34][35] A number of spatial demodulation algorithms have been proposed that are able to demodulate interferograms with closed fringes. [36][37][38][39][40] Thus, they might also form the basis of a two-step procedure to reconstruct digital offaxis holograms acquired in the presence of a microscope lens, since such general setups possibly yield closed fringes.…”

Section: B Other Related Techniquesmentioning

confidence: 99%

Complex-wave retrieval from a single off-axis hologram

2004

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We present a new digital two-step reconstruction method for off-axis holograms recorded on a CCD camera. First, we retrieve the complex object wave in the acquisition plane from the hologram's samples. In a second step, if required, we propagate the wave front by using a digital Fresnel transform to achieve proper focus. This algorithm is sufficiently general to be applied to sophisticated optical setups that include a microscope objective. We characterize and evaluate the algorithm by using simulated data sets and demonstrate its applicability to real-world experimental conditions by reconstructing optically acquired holograms.

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Section: B Other Related Techniquesmentioning

confidence: 99%

Complex-wave retrieval from a single off-axis hologram

2004

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“…For a spectroscopic device designed to be mounted on a drone, the maximum weight is about 500 g, and the device must offer spectroscopic imaging features. In addition, because spectrometers that use dispersion elements [9][10][11][12][13] require long optical paths to disperse the light, they are difficult to miniaturize sufficiently to allow them to be mounted on a wearable terminal. For these reasons, lightweight spectroscopic imaging devices with sizes on the order of a few tens of millimeters are highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Ultraminiature one-shot Fourier-spectroscopic tomography

Sato

Kawashima

et al. 2016

Opt. Eng

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Abstract. We propose one-shot Fourier-spectroscopic tomography as a method of ultraminiature spectroscopic imaging. The apparatus used in this technique consists solely of a glass slab with a portion of its surface polished at a certain inclination angle-a device we term a relative-inclination phase shifter-simply mounted on an infinite-distance-corrected optical imaging system. For this reason, the system may be ultraminiaturized to sizes on the order of a few tens of millimeters. Moreover, because our technique uses a near-common-path wavefrontdivision phase-shift interferometer and has absolutely no need for a mechanical drive unit, it is highly robust against mechanical vibrations. In addition, because the proposed technique uses Fourier-transform spectroscopy, it offers highly efficient light utilization and an outstanding signal-to-noise ratio compared to devices that incorporate distributed or hyperspectral acousto-optical tunable filters. The interferogram, which is a pattern formed by interference of waves at all wavelengths, reflects the spatial variation in the intensity of the interference depending on the magnitude of the phase shift. We first discuss the design of the phase shifter and the results of tests to validate the principles underlying one-shot Fourier-spectroscopic tomography. We then report the results of one-dimensional spectroscopic imaging using this technique. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Demand for compact-size spectrometers already exists and they have been researched, [8][9][10] but it will also be necessary for spectroscopic imagers to use the weak reflected light from biological tissues for blood glucose measurements. However, in the conventional microelectromechanical system Fourier transform infrared spectroscopy method, which is based on the use of a Michelson interferometer, the light efficiency is poor because the mirror processing accuracy is low.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity improvement of one-shot Fourier spectroscopic imager for realization of noninvasive blood glucose sensors in smartphones

et al. 2016

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Abstract. The use of the wide-field-stop and beam-expansion method for sensitivity enhancement of one-shot Fourier spectroscopy is proposed to realize health care sensors installed in smartphones for daily monitoring. When measuring the spectral components of human bodies noninvasively, diffuse reflected light from biological membranes is too weak for detection using conventional hyperspectral cameras. One-shot Fourier spectroscopy is a spatial phase-shift-type interferometer that can determine the one-dimensional spectral characteristics from a single frame. However, this method has low sensitivity, so that only the spectral characteristics of light sources with direct illumination can be obtained, because a single slit is used as a field stop. The sensitivity of the proposed spectroscopic method is improved by using the wide-fieldstop and beam-expansion method. The use of a wider field stop slit width increases the detected light intensity; however, this simultaneously narrows the diffraction angle. The narrower collimated objective beam diameter degrades the visibility of interferograms. Therefore, a plane-concave cylindrical lens between the objective plane and the single slit is introduced to expand the beam diameter. The resulting sensitivity improvement achieved when using the wide-field-stop and beam-expansion method allows the spectral characteristics of hemoglobin to be obtained noninvasively from a human palm using a midget lamp.

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A Novel Technique for Spatial Phase-shifting Interferometry

Cited by 83 publications

References 7 publications

Complex-wave retrieval from a single off-axis hologram

Complex-wave retrieval from a single off-axis hologram

Ultraminiature one-shot Fourier-spectroscopic tomography

Sensitivity improvement of one-shot Fourier spectroscopic imager for realization of noninvasive blood glucose sensors in smartphones

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