3results about How to "Improved energy resolution" patented technology

This invention relates to the field of nuclear radiation detection technology, and more particularly to an energy spectrum processing method for a quasi-hemispherical CdZnTe detector. The method includes: acquiring the raw signal collected by the quasi-hemispherical CdZnTe detector; normalizing the amplitude of the raw signal from the baseline to the highest point during the rise phase; dynamically selecting multiple energy thresholds; performing rise time discrimination on the normalized signal within each energy threshold; filtering out signals with rise times greater than RTflag and determining the rise time range corresponding to that energy threshold; constructing an intermediate energy spectrum corresponding to each energy threshold based on the signals with rise times greater than RTflag and the rise time range; and post-processing the intermediate energy spectrum to obtain the target energy spectrum corresponding to each energy threshold. This invention combines energy threshold discrimination, rise time discrimination, and energy spectrum post-processing algorithms to stably improve the energy resolution of the quasi-hemispherical CdZnTe detector for 662 keV gamma rays from the conventional 2%~3% to less than 1%.

This invention provides a multichannel energy spectrum data communication method based on parity bits. The multichannel energy spectrum detection device sends energy spectrum data to a host computer in real time. During transmission, the 16-bit binary data is divided into two parts: the lower 8 bits are sent as a single byte using either odd or even parity, and the higher 8 bits are sent as a single byte using either even or odd parity. The host computer receives the energy spectrum data from the multichannel energy spectrum detection device and verifies it until all data is received. This invention utilizes serial communication principles, encoding the energy spectrum data uploaded in real time by the multichannel energy spectrum detection device using parity bits as flags. After receiving the data, the host computer judges and reassembles the data based on whether the parity check is incorrect, and the order of correct and incorrect parity checks, thus parsing out the corresponding energy spectrum data. This method is particularly suitable for measuring radioactive samples with high nuclear particle energy resolution and high activity.

The present application relates to a kind of digital pulse energy extraction methods based on multi-section pulse integration, including step 1, extracting digital signal, triggering filtering algorithm is used for the discrimination of signal;Step 2, according to the time of pulse arrival, determine the five-section / seven-section interval integral value of waveform sampling point recorded by firmware and two timestamp information;Step 3, according to the interval integral value and timestamp information in step 2, calculate baseline value;Step 4, according to the interval integral value and timestamp information in step 2 and baseline value in step 3, calculate pulse area.The algorithm is simplified to calculate the integral value of multi-section continuous pulse, which is convenient to realize on FPGA;The method based on five-section integration can solve baseline evaluation under high accumulation rate, and dead time is small;The method based on seven-section integration can improve the energy resolution when containing low-frequency noise.