Hyperspectral imaging (HSI) is used for many applications including satellite imaging and air reconnaissance. HSI is usually executed with bulky hyperspectral-imaging cameras that are sensitive to misalignment, very expensive, and use prisms or gratings as dispersive elements. An alternative method of HSI is the combination of linear variable bandpass filters (LVBPFs) with silicon detectors. This allows for very compact, robust, and affordable HSI detectors that offer several advantages over conventional approaches.
Custom linear variable bandpass filter designs are available. Filters with the following specifications are available for immediate testing:
LV VIS NIR Bandpass Filter LF103252
LV VIS NIR Bandpass Filter LF103245
Delta Optical also offers a wedged Continuously Variable Filters (CVF), whose spectral properties vary continuously along one dimension of the filter. A single CVF can replace a number of fixed filters in an instrument. It is possible to adjust the center or edge wavelength by sliding the filter.
For more information on the LF103252 and LF103245 variable bandpass filters, download the respective datasheets above.