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CRI Tunable Liquid Crystal Filters


The CRI VariSpec is a liquid crystal tunable emission filter that provides rapid, vibration less selection of any wavelength in the visible and near IR ranges. The CRI VariSpec is ideal for a wide array of imaging applications that include multi-probe fluorescent imaging, high resolution color brightfield imaging, tissue spectroscopy, astronomy, and airborne hyper-spectral imaging. Complete software control is provided by the CRI VariSpec Control Module which is a standard component of ISee Analytical Imaging Software.

CRI VariSpec Specifications:
 Clear Aperture: 25 or 35mm
Bandwidth (FWHM): 5/7/10/15/20/30/40/50
Field of View: +/- 7 degrees from normal
Wavelength Accuracy: bandwidth / 8
Response Time: 50ms (random access)
Maximum Optical Input: 50mw/cm/cm
Computer Interface: RS-232/TTL/Sync


CRI LCTF Specification include:

bulletWavelength Range
bulletVIS1 - 450 to 650nm
bulletVIS2 - 400 to 720nm
bulletVIS3 - 425 to 750nm
bulletNIR1 - 700 to 1100nm
bulletNIR2 - 650 to 1050nm
bulletNominal Bandwidth in nm
bullet05 - 07 - 10 - 15 - 20 - 30 - 40 - 50
bulletContrast for Out of Band Light
bulletLC - less than 0.20% average out of band transmittance
bulletMC - less than 0.05% average out of band transmittance
bulletHC - less than 0.01% average out of band transmittance
bulletAperture in millimeters
bulletHand-held RS-232 Controller
bulletVariable Attenuation
bulletMicroscope Adapters
bulletF Mount and C Mount Adapters
bulletInput Polarization Control
bulletNIR Blocking Filters


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Last modified: 11/15/06