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The divided optical aperture (DOA) system is useful for both polarimetry and multi-spectral imaging applications. It is designed to mate directly to Santa Barbara Focal Plane SBF134, InSb focal plane array or any 30 micron pitch focal plane array. For polarimetry, each image measures a different polarization state. The images are precisely registered and the polarization content of the scene is determined. For a multi-spectral application, each image measures a different spectral waveband, similar to a color camera.
There are a number of advantages that the divided aperture optical system has over systems that place a polarization or spectral filters on a focal plane. First the filters are not in contact with the FPA and can be swapped in and out for a variety of polarization or multi-spectral tests and applications. Second, the divided aperture optical system is placed between a standard objective and the FPA. The optics can be added to a standard camera system to convert it to a polarimeter or a multi-spectral imager. Third, the DOA can be applied to any waveband from UV to LWIR. Finally, the FPA is not at risk by adding the DOA optics (unlike placing a filter array onto of the FPA).
Specifications
- f/# : 3.0
- Image split: 4x
- Magnification: 0.76
- Wavelength Bandwidth: 3-5 microns
- Length: 115 mm
- Diameter: 30mm
- Weight: 120 grams
- Back working distance: 8mm
- Stop location: Assumes standard IR lens location
- FPA size: 15.36 mm x 12.28 mm