However, the properties of the sample are integrated over the entire spectrum of the beam. The results show that our detector has good performances and can satisfy the requirements of ERNI for detectors at the CSNS.Īs a visible and non-destructive method of inspection, traditional neutron imaging evaluates the attenuation of a polychromatic neutron beam through a sample. In addition, any wavelengths can be selected for the neutron imaging of the given object, and the detector can be used for Bragg edge imaging. A spatial resolution of 57 μm was obtained for neutron imaging by using the centroiding algorithm, the timing resolution was on the microsecond scale and the measured wavelength spectrum was identical to that measured by a beam monitor. To evaluate its performance, a series of proof of principle experiments were performed in the BL20 at the CSNS to measure the spatial resolution and the neutron wavelength spectrum, and perform neutron imaging with sliced wavelengths and Bragg edge imaging of the steel sample. This study constructs a prototype of an energy resolved neutron imaging detector based on the fast optical camera, TPX3Cam coupled with an image intensifier. An Energy resolved neutron imaging instrument (ERNI) is being built at the CSNS but significant challenges for the detector persist because it simultaneously requires a spatial resolution of less than 100 μm, as well as a microsecond-scale timing resolution. This provides opportunities for energy resolved neutron imaging by using the TOF (Time Of Flight) approach. The China Spallation Neutron Source (CSNS) operates in pulsed mode and has a high neutron flux.
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