An extremely compact and high-speed line-scan hyperspectral imager covering the SWIR range

Gonzalez, Pilar; Pichette, Julien; Vereecke, Bart; Masschelein, Bart; Krasovitski, Leonid; Bikov, L.; Lambrechts, Andy

doi:10.1117/12.2304918

Cited by 9 publications

(8 citation statements)

References 9 publications

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“…121,169 Most recently, SRDA using etalons had been monolithically integrated on top of InGaAs sensors, making these types of spectral cameras also functional in the SWIR ranges. 170,171 Elsewhere, other researchers were finding ways to bring the cost of manufacturing down. Yu et al 172 proposed a batch wafer manufacturing method that used silver and aluminum oxide (Al 2 O 3 ) as the dielectric materials.…”

Section: Spectrally Resolved Detector Arraymentioning

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: Spectrally Resolved Detector Arraymentioning

confidence: 99%

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

Tran

Fei

2023

J. Biomed. Opt.

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“…This will enable future snapshot images with better controlled peak wavelengths and advanced filter architectures with higher edge steepness and out-of-band-blocking capabilities, such as the double cavity filters shown in Figure 2 As well as cameras in the VIS and NIR range, a snapshot camera in the short wavelength infrared (SWIR) range (1100-1650 nm) is available. The Imec Mosaic SWIR Snapshot camera has been developed to enjoy the benefits of mosaic snapshot cameras at the expense of a reduced spatial-spectral resolution with respect to the imec Snapscan SWIR camera system [23] with 100 bands in the 1100 to 1650 nm range and a maximum spatial resolution of 1200x 640 pixels. The mosaic sensors are based on 3x3 mosaic filter patterning on an industry-ready SWIR detector.…”

Section: Multispectral Snapshot Camerasmentioning

confidence: 99%

“…The mosaic sensors are based on 3x3 mosaic filter patterning on an industry-ready SWIR detector. The mosaic patterns are implemented by means of high-transmission Fabry-Pérot interferometers processed using thin-film technology [23].The Mosaic SWIR camera system offers 9 bands in the 1100-1650 nm range at a spatial resolution of 213 x 170 pixels, which can be up sampled to 633x504 pixels. The lay-out of the 9 bands selected in the 3x3 Mosaic SWIR design is illustrated in Figure 2-2.…”

Section: Multispectral Snapshot Camerasmentioning

confidence: 99%

“…Recent technology advances are proposing as well snapshot cameras in the SWIR range, either based on Acousto-Optic Tunable Filters [21] or by means of dichroic filter integration directly at sensor level, offering then 3 or 4 bands in this range [22]. Our snapshot sensor builds as well on sensor-level custom filter integration, as explained in our previous work [23] and offers a configuration of either 9 or 16 bands in the 1000-1700 nm range.…”

Section: Introductionmentioning

confidence: 99%

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Compact high-speed snapshot multispectral imagers in the VIS/NIR (460 to 960 nm) and SWIR range (1.1 to 1.65 nm) and its potential in a diverse range of applications

Blanch-Perez-del-Notario¹,

Geelen²,

Li³

et al. 2023

Hyperspectral Imaging and Applications II

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This paper presents the latest advances on Imec snapshot multispectral imagers based on either 3x3, 4x4 and 5x5 mosaic filter patterning on industry ready VIS/NIR and SWIR detectors. The mosaic patterns are implemented by means of high-transmission Fabry-Pérot interferometers processed using thin-film technology. Our snapshot multispectral imagers offer a spatial resolution of 640x480 pixels (SWIR) and 2048x1088 (VIS/NIR) down sampled according to the mosaic pattern to acquire data in 9 (3x3), 16 (4x4) of 25 (5x5) spectral bands respectively. To achieve imaging at the native spatial resolution of the sensor, super resolution methods are available post-acquisition. Moreover, our compact USB-3 cameras of 260 gr (SWIR) and 27 gr (VNIR), without lens, reach an acquisition speed of up to 120 multispectral cubes/second and are therefore suitable for dynamic applications, high-speed inspection such as a conveyor belt or UAV inspection. The potential for snapshot cameras in a wide range of applications is showcased in this paper. We first show how applications on industrial quality inspection (chocolate gloss estimation) and precision agriculture (plant disease detection) achieve good discrimination potential in the VNIR range. Specifically, UAV inspection benefits from our compact camera size, low weight, and video capabilities. We then demonstrate the potential for plastic and textile recycling in the SWIR range and the benefit brought by both VNIR and SWIR ranges for people tracking under low visibility conditions. Finally, an application involving the joint use of a microscope and a multispectral camera system is presented for particle contamination exposure assessment. The suitable range is in this case application dependent.

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“…The monolithic integration of filters on the pixels makes the cameras more mechanically robust, compact, and lightweight. Another recent advancement is the development of short-wave infrared spectral cameras using an InGaAs sensor with 15 µm wide pixels [9]. While the scope of this work is limited to integrated thin-film filters, many alternative technologies are actively being investigated [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Pixel-integrated thin-film filter simulation and scaling trade-offs

Goossens

2021

Preprint

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Thin-film optical filters can nowadays be integrated onto pixels of commercial image sensors used for spectral imaging. A drawback of having more filters on an image sensor is a loss in spatial resolution which could be regained by using smaller pixels. However, this work shows that miniaturization causes a reduction in transmittance and requires a trade-off between pixel size and filter bandwidth. This is caused by diffraction and the reduced number of reflections in the filter. Analytical wave and ray optics models are developed and used for fast transmittance prediction and this is validated using a commercial spectral sensor and numerical simulations. The identified trade-off is an intrinsic limitation of pixel-integrated thin-film filter technology and the developed models will be useful tools for exploring new hardware and computational solutions.

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An extremely compact and high-speed line-scan hyperspectral imager covering the SWIR range

Cited by 9 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

Compact high-speed snapshot multispectral imagers in the VIS/NIR (460 to 960 nm) and SWIR range (1.1 to 1.65 nm) and its potential in a diverse range of applications

Pixel-integrated thin-film filter simulation and scaling trade-offs

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