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Signal delay eliminating method based on Kalman filtering for rhodium self-powered detector

A self-sufficient energy detector, Kalman filter technology, applied in radiation measurement, neutron radiation measurement, instruments and other directions, can solve the problems affecting the accuracy of measurement and so on

Active Publication Date: 2014-06-18
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0003] Since the actual measurement process is always accompanied by noise (process noise and measurement noise), using the direct mathematical inversion method for delay elimination will amplify the detector current signal noise, which can be amplified up to 20 times, affecting the measurement accuracy

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  • Signal delay eliminating method based on Kalman filtering for rhodium self-powered detector
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  • Signal delay eliminating method based on Kalman filtering for rhodium self-powered detector

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Embodiment Construction

[0054] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] Such as figure 1 Described, a kind of rhodium self-powered detector signal delay elimination method based on Kalman filtering, its specific steps are as follows:

[0056] Step 1, establishing the nuclear reaction model of rhodium and (thermal) neutrons;

[0057] In the transient state of the reactor, the change of the flux causes the change of the rhodium self-energy neutron detector current to be asynchronous, and the latter has a certain lag compared with the former. The specific formula describing the above reaction is as follows:

[0058] ∂ m 2 ( t ) ∂ t = a 2 ...

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Abstract

The invention relates to the technical field of nuclear reactor core measuring system detector signal processing, and specifically discloses a signal delay eliminating method based on Kalman filtering for rhodium self-powered detector. The method comprises the following steps: step one, establishing a nuclear reaction model of rhodium and neutron; step two, establishing a Kalman filtering model; step three, utilizing the Kalman filtering to eliminate the current signal delay for rhodium self-powered neutron detector; wherein the step three comprises the following steps: step one, obtaining the systematic procedure white noise variance matrix Q and the systematic observation white noise variance matrix R of the Kalman filtering algorithm; step two, collecting the current value of the rhodium self-powered detector, converting the analogue signal into digital signal, and then utilizing the Kalman filtering to eliminate the current signal delay for rhodium self-powered neutron detector. The signal delay eliminating method based on Kalman filtering for rhodium self-powered detector can carry out a noise reducing treatment on measured current signals, and is capable of limiting the noise magnification times in a range of 1 to 8 under the situation that the responding time is small enough.

Description

technical field [0001] The invention belongs to the technical field of detector signal processing of a nuclear reactor core measurement system, and in particular relates to a method for eliminating signal delay of rhodium self-powered detectors based on Kalman 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), this type of detector current cannot reflect the change of t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/10G01T3/00
CPCY02E30/30
Inventor 龚禾林李庆刘启伟陈长李向阳卢宗健王金雨宫兆虎
Owner NUCLEAR POWER INSTITUTE OF CHINA
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