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‘Te camera is suited to imaging in low-light environments where other hyperspectral cameras would require powerful lights’


line scan equipment. Nireos is therefore targeting uses such as monitoring plants in greenhouses or imaging works of art, rather than conveyor belt or drone-based applications, according to Lukas Ceizaris, its business and product development manager. Another potential application is biophotonics, in which the camera could be combined with a microscope for studying biological samples exhibiting transmittance, reflectance or fluorescence. Te camera suits these applications


because of its high sensitivity, which Fabrizio Preda, CEO of Nireos, said is a result of the Fourier transform approach. ‘Compared to the dispersive- or grating-


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Mosaic filters are being integrated onto InGaAs detectors to facilitate SWIR imaging as part of the Multiple project


users from all three sectors are involved in the project. Food firm Yiotis, for example, will use the technology to monitor its chocolate production line. Te steelwork and woodwork end-users are Russula and SCM Group respectively. Although not part of the project,


Mendez-Rial noted that another potential application could be inspecting the melt- pool of laser-based additive manufacturing, to obtain thermal and geometric features in order to facilitate closed-loop control. Te technology under development in the Multiple project also includes a compact dual-aperture camera that features both CMOS and InGaAs detectors with mosaic filtering. Te device will be capable of imaging in both the visible (0.4 to 0.9µm) and SWIR (0.9 to 1.7µm) range, and according to Mendez-Rial, will be more compact and affordable than push broom cameras. Te CMOS and InGaAs detectors are being developed by Imec, and the camera platform provided by Swiss imaging firm Photonfocus.


Low-light imaging Last year, Italian firm Nireos introduced what it says is the first hyperspectral camera to use Fourier transform technology. Te Hera camera can only capture stationary objects, which differs from


www.imveurope.com | @imveurope vision.vieworks.com vision@vieworks.com


based cameras on the market, our Hera camera can achieve a much higher throughput of light,’ he said. ‘Te camera is, therefore, much more suited to imaging in low-light environments where other types of hyperspectral camera would usually require very powerful lights, which can even damage the sample.’ He explained that the Hera camera is so


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sensitive that in biophotonics it is possible to acquire a hyperspectral image of the fluorescence signal emitted by a sample, which can be several orders of magnitude weaker than excitation lights typically used to induce fluorescence. Rather than capturing an image line by


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line, Hera acquires multiple images of a scene using different parameters via an interferometer at different points inside the camera. Tanks to the Fourier transform approach, the spectrum is a continuous curve – it contains information on all wavelengths in the range measured, rather than a selection of discrete wavelengths. ‘As a result, you are gathering a lot of information which standard push broom technologies, or cameras based on filter wheels, are unable to capture,’ said Preda. Te development of the Hera camera


came about after Nireos had developed and sold Fourier-transform-based interferometers. ‘We noticed that they didn’t introduce spatial distortion, which led to us developing imaging equipment using the same technology,’ said Ceizaris. Nireos has been receiving interest in


Hera over the past few months, particularly from the scientific market. O


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Multiple project


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