The VNIR family of spectrographs provides high optical resolution while minimizing keystone and smile aberrations. The spectrograph gratings and optics are designed to cover the full wavelength range from 400 to 1000 nm from the first order dispersion. An order blocking filter is necessary to remove the second order dispersion from overlapping with the first order. Inserting an order blocking filter in front of the camera sensor allows full VNIR wavelength coverage with one spectrograph and one camera sensor. Filters are available in different sizes and holders and are ordered separately. The VNIR spectrograph can transform a scientific gray scale CCD or CMOS camera into a line-scan hyperspectral spectrophotometer for VNIR spectroscopy imaging.
There are two series of VNIR spectrographs: Standard and Enhanced. The Enhanced Series offers the best optical performance, and is recommended for high resolution (< 3 nm) applications.
As with the visible range of spectrographs, there are two separate models for the standard VNIR spectrograph, the V10 for 2/3” sensors and the V10H for 1/2” sensors. Both of these models share the same mechanical characteristics.
The VNIR range of spectrographs also includes an E-Series model suitable for imaging applications that require higher spatial or spectral fidelity than available with a standard spectrograph.
For more information, including mechanical drawings, contact our application engineers.
|VNIR Spectrograph Specifications|
|Spectral Range||400 - 1000 nm||400 - 1000 nm||400 - 1000 nm|
|Spectral Dispersion||139 nm/mm||93.9 nm/mm||97.5 nm/mm|
|Spectral Resolution||11.2 nm (w/ 80 µm slit)||9 nm (w/ 80 µm slit)||2.8 nm (w/ 30 µm slit)|
|Spatial Resolution||RMS spot radius < 40 µm||RMS spot radius < 40 µm||RMS spot radius < 9 µm|
|Image Size (Spectral x Spatial)||4.8 x 6.6 mm||6.6 x 8.8 mm||max 6.15 x 14.2 mm|
|Average Diffraction Efficiency||> 50%, independent of polarization||> 50%, independent of polarization||> 50%, independent of polarization|
|Stray Light||< 0.5% (halogen lamp, 633 nm notch filter)||< 0.5% (halogen lamp, 633 nm notch filter)||< 0.5% (halogen lamp, 633 nm notch filter)|
|Slit Width, default||50 µm (30, 80, and 150 µm available on request)||50 µm (30, 80, and 150 µm available on request)||30 µm (13, 18, 50, 80, and 150 µm available on request)|
|Slit Length||9.8 mm||9.8 mm||14.3 mm|
|Bending of Spectral||Smile < 30 µm (0.698%)||Smile < 45 µm (0.68%)||Smile < 1.5 µm (0.024%)|
|Lines Across Spatial Axis|
|Bending of Spatial||Keystone < 20 µm (0.303%)||Keystone < 40 µm (0.45%)||Keystone < 1 µm (0.007%)|
|Lines Across Spectral Axis|
|Body||Anodized Aluminum Tube||Anodized Aluminum Tube||Anodized Aluminum Tube|
|Size (W x H x L)||35 x 35 x 139 mm||35 x 35 x 139 mm||60 x 60 x 175 mm|
|Weight||300 g||300 g||1100 g|
|Lens Mount||Standard C-mount adapter||Standard C-mount adapter||Standard C-mount adapter|
|Camera Mount||Standard C-mount adapter||Standard C-mount adapter||Standard C-mount adapter|
|User Adjustments||Image axis rotation relative to detector rows, back focal length adjustable ± 1 mm (for all)|
|Storage Temperature, non-condensing||-20 °C to +85 °C||-20 °C to +85 °C||-20 °C to +85 °C|
|Operating Temperature, non-condensing||+5 °C to +40 °C||+5 °C to +40 °C||+5 °C to +40 °C|
|VNIR Spectrograph Ordering Information|
|Part number||Description||Product Name|
|MRC-304-002-01||ImSpector – Standard VNIR Spectrograph V10, 50 μm slit* (default)||ImSpector V10|
|MRC-304-002-02||ImSpector – Standard VNIR Spectrograph V10H, for 1/2” image sensor, 50 μm
|MRC-304-002-03||ImSpector – Enhanced VNIR Spectrograph V10E, 30 μm slit* (default)||ImSpector V10E|
* When ordering please specify if different slit width is needed
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