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Rhodium self-powered detector signal delaying eliminating method based on IIR filtering

A self-sufficient detector and signal delay technology, applied in radiation measurement, neutron radiation measurement, instruments, etc., can solve the difficulty of state modeling and model parameter estimation, the complexity of design and filtering, and the characteristics of state change Modeling difficulties, etc.

Active Publication Date: 2015-09-02
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is often very difficult to model state change characteristics, and state modeling and model parameter estimation are difficult to complete
In addition, when the Kalman filter is applied, the signal delay elimination and noise suppression are combined for filtering, which brings complexity to the design and filtering, and is not conducive to observing the essence of the problem

Method used

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  • Rhodium self-powered detector signal delaying eliminating method based on IIR filtering
  • Rhodium self-powered detector signal delaying eliminating method based on IIR filtering
  • Rhodium self-powered detector signal delaying eliminating method based on IIR filtering

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Embodiment 1

[0101] The rhodium self-supplied energy detector signal delay elimination method based on IIR filter comprises the following steps: Step 1, establishes the nuclear reaction model of rhodium and thermal neutron; Step 2, establishes the rhodium self-supplied energy detector signal system model; Step 3, establishes delay respectively The elimination module and the noise suppression module; step 4, complete the parameter design of the delay elimination system before the operation of the delay elimination system, and then run the delay elimination system in real time to realize the delay elimination of the signal.

[0102] The specific implementation steps of establishing the nuclear reaction model of rhodium and thermal neutrons are as follows: in the transient state of the reactor, the change of the flux causes the change of the current of the rhodium self-sufficient neutron detector to be out of sync, and the latter has a certain lag than the former . The nuclear reaction proces...

Embodiment 2

[0176] This embodiment makes the following further limitations on the basis of Embodiment 1: when it is necessary to detect the neutron flux density with a large dynamic range, it is also necessary to detect the current signal with a large dynamic range, and this problem is concentrated in on the analog-to-digital converter. In order to adapt to the quantization of the current with a large dynamic range, the analog-to-digital converter of the rhodium self-supplied energy detector samples the stepped resistance. When the current signal changes in a large range, the analog-to-digital converter will switch the resistance range. Since the gears are not completely matched, the switch between the gears will cause an approximate step-like mutation of the output signal. In the case of shifting, the detector model should be modified as Figure 5 shown. in, Figure 5 Among them, w(m) is the mutation component caused by shifting gears, and the schematic diagram of its function image i...

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Abstract

The invention discloses a rhodium self-powered detector signal delaying eliminating method based on IIR filtering. The method comprises the following steps: step 1. establishing a rhodium reaction model of rhodium and thermal neutrons; step 2. establishing a rhodium self-powered detector signal system model; step 3. establishing a delaying eliminating module and a noise inhibition module respectively; and step 4. finishing a parameter design of a delaying eliminating system before the delaying eliminating system is operated, and operating the delaying eliminating system in real time to realize the delaying elimination of a signal. The rhodium self-powered detector signal delaying eliminating method has a whole simple procedure; and the signal delaying elimination and the noise inhibition are separated so that the method is convenient to realize, popularize and apply. By virtue of the rhodium self-powered detector signal delaying eliminating method, the delaying eliminating problem of the signal of a rhodium self-powered neutron detector in a reactor is solved; and the rhodium self-powered detector current signal is directly used for a subsequent link of an advanced reactor core measurement system, and the accuracy is not lost.

Description

technical field [0001] The invention relates to a signal processing technology of rhodium self-powered neutron detectors used in a nuclear reactor power distribution on-line monitoring system, in particular to a signal delay elimination method for rhodium self-powered detectors based on IIR filtering. Background technique [0002] The rhodium self-supplied neutron detector used as the in-core detector of the advanced core measurement system, the secondary nuclide produced by the reaction of the sensitive material rhodium and the neutron undergoes beta decay to generate a current, and the magnitude and location of the current in a steady state The flux is directly proportional, so by measuring the rhodium self-powered detector can infer the neutron flux at its location. Since the main component of this type of detector current is produced by the β decay of secondary nuclides, in the transient state of the reactor (the neutron flux level changes), the detector current cannot r...

Claims

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Application Information

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IPC IPC(8): G21C17/108G01T3/00G06F19/00
CPCG01T3/00G16C99/00G21C17/108Y02E30/30
Inventor 龚禾林陈长彭星杰赵文博刘启伟李向阳李庆于颖锐
Owner NUCLEAR POWER INSTITUTE OF CHINA
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