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Rhodium self-powered detector signal delay elimination method based on Kalman filtering

A technology of self-sufficient energy detectors and Kalman filtering, which is applied in the fields of instruments, nuclear power generation, electrical digital data processing, etc., and can solve problems affecting the accuracy of measurement, etc.

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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  • Rhodium self-powered detector signal delay elimination method based on Kalman filtering
  • Rhodium self-powered detector signal delay elimination method based on Kalman filtering
  • Rhodium self-powered detector signal delay elimination method based on Kalman filtering

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Embodiment Construction

[0069] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0070] 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:

[0071] Step 1, establishing the nuclear reaction model of rhodium and (thermal) neutrons;

[0072] 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: ∂ m 2 ( t ) ∂ t = a 2 n...

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Abstract

The invention relates to the technical field of nuclear reactor core measure system detector signal processing, and particularly discloses a rhodium self-powered detector signal delay elimination method based on Kalman filtering. The method comprises the following steps: 1, establishment of a nuclear reaction model of rhodium and neutron; 2, establishment of a Kalman filtering model; and 3, rhodium self-powered neutron detector current signal delay eliminating by use of the Kalman filtering, to be more specific, 3.1, acquisition of system process white noise variance matrix Q and system observation white noise variance matrix R of kalman filtering algorithm; and 3.2, collection of rhodium self-powered detector current value for analog-to-digital conversion, and rhodium self-powered neutron detector current signal delay eliminating by use of the Kalman filtering. The rhodium self-powered detector signal delay elimination method based on the Kalman filtering can perform noise suppression on measured current signals, and can ensure that noise magnification times can be inhibited at 1-8 times in the case of small enough response time.

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 sensitive material rhodium and the secondary nuclide produced by the neutron reaction decay to generate a current. Therefore, by measuring the rhodium self-powered detector, the neutron flux at its location can be deduced. Since the main component of this type of detector current is produced by the decay of secondary nuclides, in the transient state of the reactor (the change of neutron flux level), the current of this type of detector cannot reflect the change of flux level in real time, while There is a certain delay, and the delay time parameter is consistent ...

Claims

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Application Information

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IPC IPC(8): G21C17/108G06F19/00
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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