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Filters for Hyperspectral Imaging

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Filters for Hyperspectral ImagingHyperspectral imaging has been used for a couple of decades in applications such as satellite imaging, air reconnaissance and other not overly price sensitive markets. Classical Hyperspectral imaging cameras use prisms or grating as dispersive elements. These cameras are bulky, sensitive to misalignment and very expensive. The advent of alternative approaches makes HSI attractive for volume markets or even consumer products, for example cancer detection, precision farming, food testing in supermarkets and many more.

Delta Optical Thin Film A/S develops and manufactures custom Continuously Variable Bandpass Filters (CVBPF) for mid-size and full-frame CCD/CMOS sensors. These filters offer very high transmission and are fully blocked in the light sensitive wavelength range of silicon-based detectors. The combination of CVBPFs with silicon detectors allows the design of very compact, robust and affordable HSI detectors that offer several advantages and benefits over conventional approaches:

     •   Huge aperture compared to grating and prism
     •   Higher transmission than grating and prism
     •   Short measurement time
     •   High suppression of stray light
     •   Excellent signal to background ratio

Possibility for 3D measurements and snapshot acquisition Available for immediate testing are filters with the following specifications:

     •   Centre wavelength range 450nm to 850nm, bandwidth approximately 4% of centre wavelength, transmission 70% to 90%, blocking range 200nm to 1100nm, blocking level OD4, active area 30mm x 25mm
     •   Centre wavelength range 800nm to 1100nm, bandwidth approximately 1% of centre wavelength, transmission >70%, blocking range 200nm to 1150nm, blocking level OD4, active area 32mm x 18mm

The sizes are given as height x length, where height is perpendicular to the wavelength gradient and length is along the wavelength gradient. The filters can be diced to smaller sizes.  


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