Delay eliminating method for signal of self-powered vanadium detector based on H-infinity filtering

A self-sufficient detector and signal delay technology, applied in radiation measurement, neutron radiation measurement, instruments, etc., can solve problems such as difficult application

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

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Problems solved by technology

[0004] At present, the elimination of signal delay applied to vanadium self-powered detectors is mainly based on the Kalman filter. It must be assumed that the external disturbance input signal of the system is a white noise signal with known statistical properties. When the statistical properties of the input signal are difficult to obtain This method is difficult to apply when

Method used

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  • Delay eliminating method for signal of self-powered vanadium detector based on H-infinity filtering
  • Delay eliminating method for signal of self-powered vanadium detector based on H-infinity filtering
  • Delay eliminating method for signal of self-powered vanadium detector based on H-infinity filtering

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Embodiment

[0073] Such as figure 1 The structural diagram of the vanadium self-sufficient neutron detector shown, in which the names of the components of each serial number correspond to: 1-emitter, 2-insulation layer, 3-collector, 4-wire, 5-protective shell, 6-insulation Cable, 7-current line, 8-base line, 9-sealed tube, 10-current output terminal. The characteristic parameters of the vanadium self-supplied neutron detector are: λ 1 =ln2 / 42.3s -1 =0.016386s -1 ,λ 2 =ln2 / 4.34 / 60s -1 =0.00266186s -1 , c=0.06, a 1 =0.879,a 2 = 0.061. image 3 It is a schematic diagram of the nuclear reaction between vanadium and neutrons, for image 3 During the reaction process, the figure 1 device for measurement. Such as figure 2 As shown, the method for eliminating the signal delay of vanadium self-powered detectors based on H∞ filtering includes the following steps in sequence: step 1, establishing the nuclear reaction model of vanadium and thermal neutrons; step 2, using direct transform...

Embodiment 2

[0112] This embodiment makes the following further limitations on the basis of Embodiment 1: in the case of shifting, it also includes processing the original signal according to the following signal processing method: in the shifting area, assuming that the neutron flux remain unchanged, then invert the current signal generated by the neutron flux density, and then subtract it from the actual output current of the detector to obtain the shift mutation component; outside the shift region, the detector output current minus the shift mutation component, The current signal generated by the neutron flux density is obtained, and then the delay elimination process is performed on the current signal.

[0113] The shift area design structure of the present embodiment is as follows:

[0114] In the shift area (k 1 ≤k≤k 2 ), assuming that the neutron flux density remains constant, then:

[0115] n(k+1)=n(k) (13)

[0116] J a (k+1)=e -λ·Ts J a (k)+(1-e -λ·Ts )n(k) (14)

[0117] ...

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Abstract

The invention discloses a delay eliminating method for a signal of a self-powered vanadium detector based on H-infinity filtering. The delay eliminating method sequentially comprises the following steps of 1, establishing a nuclear reaction model of vanadium and thermal neutrons; 2, establishing a discrete state equation corresponding to the nuclear reaction model through direct transform; 3, determining the instant response share of the current of the self-powered vanadium detector; and 4, carrying out delay elimination on a current signal of the self-powered vanadium detector by using a H-infinity filter. When the delay eliminating method is applied, a current signal of a self-powered vanadium neutron detector can be subjected to delay elimination, and noise can also be effectively inhibited, so that the self-powered vanadium neutron detector can also be normally used under the instantaneous condition of a reactor; in addition, due to the adoption of the H-infinity filter, the statistical property of an external disturbance input signal is not needed to be known in advance during delay elimination.

Description

technical field [0001] The invention relates to a signal processing technology of a vanadium self-supplied neutron detector used in an advanced core measurement system (on-line monitoring system for nuclear reactor power distribution), in particular to a signal delay elimination method of a vanadium self-supplied detector based on H∞ filtering. Background technique [0002] The vanadium self-sufficient 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 vanadium 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 the neutron flux at its location can be deduced by measuring the vanadium self-supplied energy detector. 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 (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/108G01T3/00G06F19/00
CPCG01T3/00G16Z99/00G21C17/108Y02E30/30
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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