Spatial Phase-Shifting Digital Holography for Three-Dimensional Particle Tracking Velocimetry

Murata, Shigeru; Harada, Daisuke; Tanaka, Yohsuke

doi:10.1143/jjap.48.09lb01

Cited by 29 publications

(14 citation statements)

References 12 publications

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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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Section: Introductionmentioning

confidence: 99%

Ultraminiature one-shot Fourier-spectroscopic tomography

Sato

Kawashima

et al. 2016

Opt. Eng

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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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“…Digital holography [1]- [5] is a technique being capable of 3-D measurement of a moving object and is applied to a variety of fields, such as, particle and flow measurement [6], [7], microscopy [8], [9], quantitative phase measurement [10], [11], object recognition [12], [13] and so on. In digital holography, a hologram is recorded by image sensor and the image of an object is reconstructed by computer.…”

Section: Introductionmentioning

confidence: 99%

Single-shot 3-D sensing of micro-meter height by multi-wavelength parallel phase-shifting digital holography

Lee

Ito

Tahara

et al. 2013

Proceedings of the 2013 IEEE/SICE International Symposium on System Integration

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We propose a single-shot three-dimensional sensing technique being capable of achieving measurement of a micro-meter height by multi-wavelength parallel phase-shifting digital holography. In the proposed technique, we use the two-wavelength phase unwrapping method to expand measurement range in the height direction to measure a step of more than half a wavelength in height. To confirm the effectiveness of the proposed technique, we conducted an optical experiment in which we used the object with abrupt step of 1.90 m. The experimental result indicated that the height of the object was 1.85 m. Thus, we experimentally verified the proposed technique.

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Spatial Phase-Shifting Digital Holography for Three-Dimensional Particle Tracking Velocimetry

Cited by 29 publications

References 12 publications

Ultraminiature one-shot Fourier-spectroscopic tomography

Ultraminiature one-shot Fourier-spectroscopic tomography

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

Single-shot 3-D sensing of micro-meter height by multi-wavelength parallel phase-shifting digital holography

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