Development of wide fieldofview imaging spectrometer using innerstitching

In order to increase the field of view(FOV) of imaging spectrometer and improve the efficiency of the remote sensing, a wide FOV imaging spectrometer using innerstitching was designed and developed. First, the constitution of the pushbroom imaging spectrometer using innerstitching was analyzed. Then two Offnertype dispersion systems using convex grating were stitched and a prototype of the imaging spectrometer based on innerstitching was developed. The pixel misalignment, the spectral resolution and the modulation transfer function (MTF) of the prototype were measured in the laboratory. Finally, the outdoor spectral imaging experiment was accomplished. The measurements show that the pixel misalignment in spectral dimension is about 0.15 pixel (the wavelength is 479 nm) and the misalignment in spatial dimension is about 0.16 pixel and 0.19 pixel for crosstrack and alongtrack direction respectively. The spectral resolution of the prototype is about 1.6 nm and its MTF value at Nyquist frequency is about 0.2. The development and the experiment validate the effectiveness of using innerstitching to increase the FOV for imaging spectrometer, and lay the foundation for the future work.