Compact birefringent interferometer for Fourier transform hyperspectral imaging

Bai, Caixun; Li, Jianxin; Yixuan, Xu; Yuan, Hao; Liu, Jie

doi:10.1364/oe.26.001703

Cited by 19 publications

(7 citation statements)

References 38 publications

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“… 154 In recent years, birefringent (different refractive index based on light polarization and propagation) crystals were being used to generate compact interferometers in FTIS. 96 , 149 , 155 The majority of birefringent crystal schemes were either Wollaston or Savart prisms. 155 Both optical schemes used prisms to separate polarized light and collimate them to introduce a delay in the light.…”

Section: Technical Aspects Of Compact Spectral Camerasmentioning

confidence: 99%

“…They also have no moving component, making them the preferred method for vibration-sensitive applications 93 . Interferometers refer to a broad class of spectral imaging layouts that use different reflective surfaces layouts to produce interference, such as the Michelson interferometer, the Sagnac interferometer, the Mach–Zehnder interferometer, and the FPI 96 …”

Section: Acquisition Overviewmentioning

confidence: 99%

“…Mainly, they required accurate mechanical movement, making them unsuitable for field deployment 154 . In recent years, birefringent (different refractive index based on light polarization and propagation) crystals were being used to generate compact interferometers in FTIS 96 , 149 , 155 . The majority of birefringent crystal schemes were either Wollaston or Savart prisms 155 .…”

Section: Technical Aspects Of Compact Spectral Camerasmentioning

confidence: 99%

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Compact and ultracompact spectral imagers: technology and applications in biomedical imaging

Tran

Fei

2023

J. Biomed. Opt.

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. Significance Spectral imaging, which includes hyperspectral and multispectral imaging, can provide images in numerous wavelength bands within and beyond the visible light spectrum. Emerging technologies that enable compact, portable spectral imaging cameras can facilitate new applications in biomedical imaging. Aim With this review paper, researchers will (1) understand the technological trends of upcoming spectral cameras, (2) understand new specific applications that portable spectral imaging unlocked, and (3) evaluate proper spectral imaging systems for their specific applications. Approach We performed a comprehensive literature review in three databases (Scopus, PubMed, and Web of Science). We included only fully realized systems with definable dimensions. To best accommodate many different definitions of “compact,” we included a table of dimensions and weights for systems that met our definition. Results There is a wide variety of contributions from industry, academic, and hobbyist spaces. A variety of new engineering approaches, such as Fabry–Perot interferometers, spectrally resolved detector array (mosaic array), microelectro-mechanical systems, 3D printing, light-emitting diodes, and smartphones, were used in the construction of compact spectral imaging cameras. In bioimaging applications, these compact devices were used for in vivo and ex vivo diagnosis and surgical settings. Conclusions Compact and ultracompact spectral imagers are the future of spectral imaging systems. Researchers in the bioimaging fields are building systems that are low-cost, fast in acquisition time, and mobile enough to be handheld.

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Section: Technical Aspects Of Compact Spectral Camerasmentioning

confidence: 99%

Section: Acquisition Overviewmentioning

confidence: 99%

Section: Technical Aspects Of Compact Spectral Camerasmentioning

confidence: 99%

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Compact and ultracompact spectral imagers: technology and applications in biomedical imaging

Tran

Fei

2023

J. Biomed. Opt.

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“…The reconstruction of static Fourier transform spectrometers with Wollaston prisms has been studied, including the relation between the wavelength and the refractive index, the nonlinear optical path difference and the wavelength calibration. The wavelength calibration process for an interferometric imaging spectrometer is described in Li et al (2019) and Bai et al (2018). However, because the principles of these spectrometers differ from those of photoelastic spectrometers, the wavelength calibration method cannot be directly applied to PEM-FTs.…”

Section: Introductionmentioning

confidence: 99%

A wavelength calibration method for photoelastic-modulated Fourier transform spectrometers

Zhang

Ning²,

Liu³

et al. 2022

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Purpose An interferogram is produced by modulating the difference between the extraordinary refractive index and the ordinary refractive index for photoelastic crystals in photoelastic-modulated Fourier transform spectrometers (PEM-FTs). Due to the influence of the refractive index dispersion characteristics on the maximum optical path difference of the interferogram, it is necessary to study wavelength calibration methods. Design/methodology/approach A wavelength calibration method for PEM-FTs was proposed based on the modulation principle of the photoelastic-modulated interferometer and the relationship between the maximum optical path difference and the refractive index difference. A 632.8 nm narrow-pulse laser was used as a reference source to measure the maximum optical path difference () of the interferogram, and the parameter was used to calculate the discrete frequency points in the frequency domain. To account for the influence of refractive index dispersion on the maximum optical path difference, the refractive index curve for the photoelastic crystal was used to adjust the discrete frequency coordinates. Findings The error in the reconstructed spectral frequency coordinates clearly decreased. The maximum relative error was 2.5%. A good solar absorption spectrum was obtained with a PEM-FT experimental platform and the wavelength calibration method. Originality/value The interferogram is produced by adjusting the difference between extraordinary refractive index and ordinary refractive index for the photoelastic crystal in the PEM-FTs. Given the wavelength dependence on the refractive indices, in view of the modulation principle of the photoelastic modulated interferometer, the relationship between the maximum optical path difference and the refractive index difference, the variation law of the refractive index of the photoelastic crystal and the process of spectral reconstruction is presented in this paper.

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“…In the last few years, birefringent interferometers have attracted particular attention because of their compactness and insensitivity to vibrations, due to their common-path nature. They are mostly based on Wollaston or Savart prisms [26,27], or their variants [28]; because of the arrangement of their optical axes, they are characterized by a strong chromatic lateral displacement, which reduces the visibility of the interference fringes [29].…”

mentioning

confidence: 99%

Hyperspectral imaging with a TWINS birefringent interferometer

Perri¹,

Faria²,

Teles-Ferreira³

et al. 2019

Opt. Express

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We introduce a high-performance hyperspectral camera based on the Fouriertransform approach, where the two delayed images are generated by the Translating-Wedge-Based Identical Pulses eNcoding System (TWINS) [Opt. Lett. 37, 3027 (2012)], a commonpath birefringent interferometer that combines compactness, intrinsic interferometric delay precision, long-term stability and insensitivity to vibrations. In our imaging system, TWINS is employed as a time-scanning interferometer and generates high-contrast interferograms at the single-pixel level. The camera exhibits high throughput and provides hyperspectral images with spectral background level of −30dB and resolution of 3 THz in the visible spectral range. We show high-quality spectral measurements of absolute reflectance, fluorescence and transmission of artistic objects with various lateral sizes.

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Compact birefringent interferometer for Fourier transform hyperspectral imaging

Cited by 19 publications

References 38 publications

Compact and ultracompact spectral imagers: technology and applications in biomedical imaging

Compact and ultracompact spectral imagers: technology and applications in biomedical imaging

A wavelength calibration method for photoelastic-modulated Fourier transform spectrometers

Hyperspectral imaging with a TWINS birefringent interferometer

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