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Swirmwir lwir

Users who wish to set up Snapshot SWIR systems for inspecting “macro” samples can select a lens with a focal length that allows them to achieve their Field-of-View requirements. To complete the system, users may add a Lab Setup kit that includes the following: (a) a mounting setup with vibration dampening on a breadboard with a sturdy metal frame (b) 4 x 20W Halogen lighting solution, with diffusers (c) a stabilized DC power supply (d) a 200mm x 200mm calibration tile with 95% reflectance (d) a Color checkerboard calibration card

NIRSWIR

Included with Snapshot SWIR cameras is HSI Mosaic software for the acquisition of spectral image datacubes which are ENVI compatible. HSI Mosaic is a powerful, user-friendly software that helps researchers discover spectrally significant information in the reflected light from their samples that is inaccessible via conventional imaging systems. Users may also interact with datacubes from HSI Studio, which is included with the camera. HSI Studio is a user-friendly tool for the interactive visualization of ENVI compatible datacubes.

Snapshot SWIR cameras are used by researchers & engineers to spectrally inspect samples by rapidly acquiring selected spectral and spatial data from a field of view. The image sensors used in these cameras employ imec’s proprietary technology in which 10~15nm FWHM Fabry-Perot band-pass spectral filters are deposited in a pattern on the photosensitive pixels of an InGaAs imager. In Snapshot SWIR cameras, the band-pass filters are deposited on the image sensors in a 3×3 mosaic pattern.

Snapshot SWIR  cameras are shipped as complete systems with a sturdy Pelicase in which the snapshot SWIR camera, all necessary cables and software are included.

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SonySWIR

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SWIRVision Systems

Snapshot SWIR cameras generate spectral and spatial data at video rates, capturing the image circle that is projected by the lens or microscope optics onto the focal plane. Pixel values are read out and can now be rearranged with each λ plane along the z-axis representing the spatially sampled (x,y) intensity values measured for a particular wavelength.

Mid infrared

The lenses shown in the following table have a high optical resolution which exceeds the Nyquist limit imposed by the pixel size of this camera. Please check out our Knowledge Base Article for more details on why this is an important consideration for system designers.

Using the method described in our Knowledge Base Article titled “How Diffraction Limits the Optical Resolution of a Microscope” one can estimate the performance of this camera when used in a microscope with commercially available microscope objectives. In the table below, it is assumed that the microscope is comprised of the objective and a tube lens with the correct focal length for the objective such that the nominal optical magnification of the microscope is the value that is specified for the objective. SNAPSHOT SWIR Camera Parameters Optical Format #Megapixels #H pixels #V pixels Pixel size (μm) H size (mm) V size (mm) Diagonal (mm) > 2/3" 0.33MP 640 512 15 9.6 7.68 12.29 Objectives (for reference only) Objective: Mag/NA 1X\0.03NA 2X\0.1NA 4X\0.13NA 10X\0.26NA 20X\0.5NA 40X\0.75NA 60X\0.85NA 100X\1.4NA Min. feature size (um) 11.18 3.36 2.58 1.29 0.67 0.45 0.39 0.24 Max pix size (um) 5.59 3.36 5.16 6.45 6.70 9.00 11.70 12.00 FN (mm) 22 22 22 22 22 22 22 22 WD (mm) 8 56.3 17.2 16 2.1 16 0.66 0.31-0.4 NA 0.03 0.1 0.13 0.26 0.5 0.75 0.85 1.4 Magnification 1 2 4 10 20 40 60 100 Estimated Performance of Camera and Objective Combinations (*) Limiting Resolution (µm) 30 15 7.5 3 1.5 0.75 0.5 0.3 Vignetting? No No No No No No No No FOV (H x V) mm 9.6 x 7.68 4.8 x 3.84 2.4 x 1.92 0.96 x 0.77 0.48 x 0.38 0.24 x 0.19 0.16 x 0.13 0.1 x 0.08 FOV (diagonal) mm 12.29 6.15 3.07 1.23 0.61 0.31 0.2 0.12 Please contact our imaging experts for assistance in selecting a camera & objective combination that fulfils your FOV & resolution requirements at application-specific wavelengths. 1) The minimum feature size is estimated using the Rayleigh Criteria at λ = 550nm; it can be re-calculated for other wavelengths. R = 1.22*λ/(2NA) 2) The maximum pixel size is estimated by applying the Nyquist criteria to the minimum feature size as it appears on the imager plane. Maximum pixel size = R*magnification/2 3) Camera and Objective combinations which meet the Nyquist criteria and are therefore diffraction limited are indicated by showing the Limiting Resolution in green font. (*) 4) Values for Working Distance (WD) and Field Number (FN) are shown for reference only. Actual values may vary. 5) Vignetting, a darkening of the image at the corners, may be observed if the Imager Diagonal is larger than the Field Number of the Objective.

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The cameras are c-mount compatible, which allows their use in microscopy or with conventional camera lenses. See below for an animation that describes the operation of snapshot cameras (generalized, not specific to the snapshot SWIR camera)

LWIR

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Please contact Scientific Imaging to select a suitable lens based on your Field-of-View requirements. Optical format > 2/3" #H pixels #V pixels Pixel size (μm) H size (mm) V size (mm) Diagonal (mm) snapshot SWIR 0.33MP 640 512 15 9.6 7.68 12.29 In applications that require the best achievable optical resolution, it is desirable to use a lens with an optical resolution ≥ 33 lp/mm for an image sensor with a pixel size of 15μm. This will ensure that the optical resolution of the camera & lens combination is Nyquist-limited by the pixel-size of the camera, and not by the quality of the lens.

The systems are robust enough for lab operation as well as for use in the field, on fixed or movable platforms including UAVs.