Fission chamber output signal digital processing system and method

Abstract

The invention discloses a fission chamber output signal digital processing system and a method thereof, relates to the technical field of nuclear reactor. The system contains a preamplifier circuit and a digital processing device, wherein the digital processing device contains a signal processing unit, a high-speed analog signal acquisition unit and a signal output unit. The high-speed analog signal acquisition unit is respectively connected with the preamplifier circuit and the signal processing unit and is used for acquiring an output signal of the preamplifier circuit and converting the output signal into a digital signal for outputting. The signal processing unit is connected with the high-speed analog signal acquisition unit and is used for determining the root-mean-square value of the digital signal acquiring neutron flux according to the root-mean-square value and a calibration coefficient of preset neutron flux measuring range. According to the invention, circuit is simplified, problems such as temperature drift of components and noise in the analogue processing circuit are avoided, precision of the measurement result is raised, and stability of the system is increased.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a digital processing system and method for output signals of a fission chamber. Background technique [0002] The nuclear measurement system outside the nuclear power plant is used to realize the neutron monitoring of the reactor. It monitors the neutron flux level of the core by detecting the leaked neutrons of the core, which plays an important role in the safe and stable operation of the nuclear power plant. [0003] The fission chamber can be used to monitor the neutron flux outside the reactor, and its monitored neutron flux changes generally reach more than ten orders of magnitude, which can meet the neutron flux monitoring of the reactor at all stages from start-up to full power operation. When the neutron flux level is relatively low, the fission chamber outputs electrical signals in the form of pulses, and the pulse frequency is proportional to the neutron flux ...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned signal processing device based on analog electronic technology has the following problems: the signal processing circuit is divided into a pulse processing circuit and an RMS value calculation circuit, and their output results need to be overlapped by a specially designed circuit, and the circuit is very complicated. And the root mean square value calculation circuit realized by using analog technology is difficult to achieve high precision in the measurement results due to the temperature drift and noise of the device.

In addition, the linearity of the output results of the existing signal processing devices based on analog electronic technology is poor

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