High-speed photon correlator with large dynamic range
A technology of photon correlator and large dynamic range, which is applied in the direction of instruments, scientific instruments, measuring devices, etc. It can solve the problems of high cost of correlators and unstable baseline of correlation functions, etc., so as to improve dynamic range, increase speed, and reduce hardware resources the effect of the demand
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Embodiment approach 1
[0078] refer to Figure 8 , the channel structure of the first group of correlation operation is composed of 16 correlation channels. The photon pulse signal is input through the input terminal CIN of the photon counting module Counter, and is counted under the driving of the rising edge of the sampling clock CLK, and the obtained count value is output by the output terminal Q[15:0] of the photon counting module Counter, and then sent to Input B[15:0] of the 16 associated channels and A[15:0] of the first associated channel. After the photon count value forms a delay of one sampling clock cycle in the relevant channel, it is output from the output terminal AO[15:0] of the previous relevant channel to the input terminal A[15:0] of the next relevant channel. Each relevant channel performs multiplication and accumulation operation on the photon count value input from the input terminal A[15:0] and B[15:0], and the obtained correlation function value is sent to the multi-channel ...
Embodiment approach 2
[0080] refer to Figure 9, the structure of the second group of correlation operation channels is similar to that of the first group of correlation operation channels, except that a delay unit Delay8 is added to the second group of correlation operation channels, and after the count value of the photon counting module Counter is delayed by 8 sampling clock cycles, Then carry out the correlation calculation, the obtained correlation function value, and the total sampling times and total photon count value output by the monitoring channel Monitor are sent to the multiplexer Multiplexer, and output to the DSP chip circuit from the port COR[31:0] in turn . From the second group, the structure of each channel group is exactly the same.
[0081] The present invention is based on a photon correlator combining a high-speed channel and a low-speed channel. The calculation method of its dynamic range is as follows: the FPGA chip circuit contains 12 groups of correlation channels, the f...
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