Automatic correction of diffraction pattern shift in a pushbroom hyperspectral imager with a piezoelectric internal line-scanning unit

Abdo, Mohammad; Förster, Erik; Bohnert, Patrick; Stürmer, Moritz; Badilita, Vlad; Brunner, Róbert; Wallrabe, Ulrike; Korvink, Jan G.

doi:10.1117/12.2248467

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…129 To develop spectral imagers that can be compact and usable for live imaging, new techniques in spatial scanning acquisition have been devised to overcome the movement problem. These techniques use microelectronic internal devices such as digital micromirror devices (DMD) 142 and piezoelectric motors 70,79,143 to move the imaging sensors or optical components. Several commercial systems, such as those shown by Wu et al 77 and Behmann et al, 144 are fast enough that they can capture accurate spatial data entirely handheld.…”

Section: Spatial Scanningmentioning

confidence: 99%

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: Spatial Scanningmentioning

confidence: 99%

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

Tran

Fei

2023

J. Biomed. Opt.

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“…In our previous work [24,25], we demonstrated a pushbroom system based on an internal scanning slit and a rotating camera mechanism. This combination enabled spatial scanning without relative motion and without compromising the spectral calibration nor the imaging resolution of the system.…”

Section: Introductionmentioning

confidence: 99%

Spatial scanning hyperspectral imaging combining a rotating slit with a Dove prism

Abdo¹,

Badilita²,

Korvink³

2019

Opt. Express

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We present a new concept for spatial scanning hyperspectral imaging. Spatial scanning is one of the main methods used for hyperspectral data acquisition and can provide high spectral resolution over a wide spectral range. However, conventional techniques, such as the whiskbroom and the pushbroom techniques, suffer from the need for relative motion between the target and the imaging system, which increases the complexity on the hardware side and limits the application possibilities. Our new approach combines a rotating slit and a co-rotating Dove prism. The rotating slit scans the target image by selecting one line from the image at each angular position of the slit. The rotating Dove prism is used to synchronously realign the transmitted light from the selected image line with respect to the transmission grating to allow the projection of the diffracted light over the same range of pixel columns of the image sensor to facilitate data acquisition and extraction of spectral information. The new approach enables the spatial scanning of the target image without the need for relative linear motion or the use of additional external equipment and therefore opens the door for more application scenarios.

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Dual-mode pushbroom hyperspectral imaging using active system components and feed-forward compensation

Abdo

Förster

Bohnert

et al. 2018

Review of Scientific Instruments

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Among the methods developed for hyperspectral imaging, pushbroom spatial scanning stands out when it comes to achieving high spectral resolution over a wide spectral range. However, conventional pushbroom systems are usually realized using passive system components, which has limited their flexibility and adaptability and narrowed their application scenarios. In this work, we adopt a different approach to the design and construction of pushbroom systems based on using active internal components. We present a new system concept utilizing an internal line scanning unit and a rotating camera mechanism. This enables a dual-mode imaging system that allows switching between 2D spatial imaging and spectral imaging. The line scanning unit, which consists of a narrow slit mounted to a linear piezo motor, facilitates the spatial scanning of the target while eliminating the laborious relative motion between the target and the imaging system, which is needed in conventional spectrographs. A software is developed for the automation and synchronization of the active components, which enables a novel feed-forward compensation function to compensate the shift in the diffraction angle due to the scanning motion of the slit and provide higher flexibility in data acquisition.

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Automatic correction of diffraction pattern shift in a pushbroom hyperspectral imager with a piezoelectric internal line-scanning unit

Cited by 3 publications

References 9 publications

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

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

Spatial scanning hyperspectral imaging combining a rotating slit with a Dove prism

Dual-mode pushbroom hyperspectral imaging using active system components and feed-forward compensation

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