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More than just a few colours

Hyperspectral imaging (HSI) has been used for a couple of decades in applications such as satellite imaging, air reconnaissance and other markets that are not overly price sensitive. Classical hyperspectral-imaging cameras use prisms or gratings 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 and applications–for example, cancer detection, precision farming, food testing in supermarkets and many more.

These filters offer very high transmission and are fully blocked in the light-sensitive wavelength range of silicon-based detectors (200 nm to 1150 nm). 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 with grating and prism
• Higher transmission than grating and prism
• Short measurement time
• High suppression of stray light
• Excellent signal to noise ratio