4H-silicon carbide (4H-SiC) detectors are well suited for measurements of fission neutron pulse shape for their compact size, excellent radiation resistance, and hydrogen free composition. The aim of this study is to improve the 4H-SiC detector's sensitivity to fission neutron pulses. 4H-SiC detectors with varied epilayer thicknesses are fabricated and then tested in the pulsed neutron field of the Chinese Fast Burst Reactor II (CFBR II). The sensitivity of the 4H-SiC detector to the CFBR II neutron pulse is increased by 139.8%, with the enlargement of epilayer thickness from 20 μm to 120 μm. By employing the proton-recoil method, the sensitivity of the 4H-SiC detector to the CFBR II neutron pulse is further increased by 11.6%. With enhanced sensitivity to fission neutron pulses, 4H-SiC detectors are promising devices for high intensity neutron pulse measurements.

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Most of the existing hyperspectral imagers can provide the image of insulators. Traditional optical elements such as prism and grating can only reflect the surface pollution in a certain period of time. In this paper, a new type of splitter, linear gradation filter, is proposed to replace the former grating and prism for splitting light. Compared with the traditional hyperspectral imaging system using prism or grating spectroscopy, the filter based hyperspectral camera has smaller volume, wider scanning range and higher spatial and spectral resolution.