Study On Hyperspectral Imaging System Using Binary Optical Lens

Binary optical elements, also known as phase zone plate lenses, have been proposed for many applications. One of the principle limitations of these lenses is abundant chromatic aberration that prohibits broadband use without design compensation. Binary optic hyperspectral imaging technology exploits this typically unwanted effect, utilizing a phase lens to provide both imaging and dispersion to create an imaging spectrometer. The binary optic imaging spectrometer is a small, high resolution, compact, economical, rugged, programmable spectral imaging sensor. This dissertation presents theoretical and two design programs studies of stare hyperspectral imaging system using longitudinal chromatic aberration of binary optical lens and achieved very good results.In chapter one of this dissertation the development history,characters and application of binary optics are reviewed. And the development, principles, classification and application of hyperspectral imaging technology are introduced. The binary optic hyperspectral imaging technology is a spectro-tomographic technique which integrates over a narrowband of the image cube which is a new concept of imaging spectrometer. Chapter two presents optical imaging characters of binary optical elements. In Chapter three the principles of spectrum-dividing for binary optic hyperspectral imager are firstly introduced. Then design of the constant magnification zoom system, spectral resolution and the strengths and weaknesses of the binary optic hyperspectral imaging technology are provided. In chapter four the structure and design of spectrum-dividing for binary optic hyperspectral imager is discussed in detail. Two design methods of spectrum-dividing for binary optic hyperspectral imager are presented. The method that putting the binary optic element at the front focus plan of achromatic system resolved the problem that magnification vary with wavelength changing. The spectrum-dividing system is analyzed and evaluated by the optical design software CODE V. The design parameters are as below: wave band 0.5μm-0.9μm, spectrum resolution 10nm(λ=632.8nm), Effective Focal Length 300mm, Entrance Pupil Diameter 60mm, TFOV±0.9°(λ=632.8nm). The design results indications that the designed system is simple in structure, and reduced the weight, well achromatic. The system's image resolution is very high. Moreover the image matching error is small, which makes high precision detection into realizable. In the chapter five prospects for the binary optic hyperspectral imaging technology are provided. At last make a summary for this thesis.