CN112799116A - Method for increasing source searching distance based on cross-correlation technology - Google Patents
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Abstract
The application relates to the technical field of radioactive sources, in particular to a method for improving a source searching distance based on a cross-correlation technology, which comprises the following steps: step 1, arranging two or more than two nuclear radiation detectors; step 2, preprocessing the detected signal through a signal preprocessing circuit; step 3, counting pulse signals of the signals processed in the step 2 through a counter or sampling voltage signals through an analog-to-digital converter; step 4, acquiring data signals through a signal acquisition and cross-correlation calculation module, and performing cross-correlation calculation on the data signals; and 5, when the cross-correlation calculation result has a local maximum value, determining that the radioactive source exists. The method adopts a cross-correlation algorithm, can obviously eliminate the interference of the nuclear radiation background of the natural environment on the measured data, can improve the source searching distance by 1.5 times to 2.5 times compared with the conventional source searching system, obviously improves the distance for searching the radioactive source, finds the radioactive source in time and reduces the probability of radiation accidents.
Description
Technical Field
The application relates to the technical field of radioactive sources, in particular to a method for improving a source searching distance based on a cross-correlation technology.
Background
In recent years, the number of radiation sources in China is rapidly increased, but loss accidents sometimes happen. According to incomplete statistics, the number of radioactive sources used in China exceeds 10 thousands, and the number of radiation accidents is 30 per year on average.
In China, there are related researches on finding radioactive sources, from the viewpoint of universality, it is considered that after a radioactive source is lost or stolen, the approximate position of a lost or stolen radioactive source area can be determined, if the radiation intensity distribution of the whole area can be known by finding the lost or stolen radioactive source in the area, the maximum value point is considered to be the position of the lost or stolen radioactive source, and the work of finding the radioactive source is very beneficial. In the course of studying the radiation field formed by a radiation source, the radiation source is usually considered as a point source.
So far, in the research process of the existing source searching algorithm, area grid division is basically used, a plane coordinate system is established for the approximate area where the radioactive source is lost or stolen, then grid division is established for the plane according to a certain granularity, the radiation dose value of grid nodes is obtained, the radiation field intensity is restored according to the radiation dose value of the existing grid nodes, and finally, the trajectory planning is carried out to find the lost or stolen radioactive source.
The longer the detection distance of the source searching system is, the longer the distance between the grid nodes is, the less time is required for searching the radioactive source, the more timely the radioactive source can be found, and the probability of radiation accidents is reduced. Therefore, the detection distance of the source searching system is an important index for determining the efficiency of the source searching system.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides a method for increasing the source searching distance based on the cross-correlation technology, which can increase the source searching detection distance and enlarge the detection range of a source searching system.
The application provides a method for improving a source searching distance based on a cross-correlation technology, which comprises the following steps: step 1, arranging two or more than two nuclear radiation detectors; step 2, preprocessing the detected signal through a signal preprocessing circuit; step 3, counting the pulse signals of the signals processed in the step 2 through a counter; step 4, acquiring the pulse signals output by the counter through a signal acquisition and cross-correlation calculation module, and performing cross-correlation calculation on the pulse signals; and 5, determining the existence of the radioactive source when the cross-correlation calculation result has a local maximum value.
Further, the signal preprocessing circuit in step 2 is a pulse shaping circuit.
The application also provides a method for improving the source searching distance based on the cross-correlation technology, which comprises the following steps: step 1, arranging two or more than two nuclear radiation detectors; step 2, preprocessing the detected signal through a signal preprocessing circuit; step 3, sampling the voltage signal of the signal processed in the step 2 through an analog-to-digital converter; step 4, acquiring voltage signals output by the analog-to-digital converter through a signal acquisition and cross-correlation calculation module, and performing cross-correlation calculation on the voltage signals; and 5, determining the existence of the radioactive source when the cross-correlation calculation result has a maximum value.
Further, the signal preprocessing circuit in step 2 is a voltage filter circuit.
Further, the nuclear radiation detector is mounted on the motion platform.
Further, the cross-correlation calculation includes a generalized cross-correlation algorithm and a pole zero cross-correlation algorithm or other cross-correlation algorithms.
The method for improving the source searching distance based on the cross-correlation technology has the following beneficial effects:
the invention sets two or more than two nuclear radiation detectors, each nuclear radiation detector is connected with a signal preprocessing circuit, the signal preprocessing circuit transmits the processed signals to a signal acquisition and cross-correlation calculation module for processing, a plurality of nuclear radiation detectors monitor the same radioactive source, the generated data are divided in time, the cross-correlation calculation is carried out by utilizing the data streams with similar shapes and time sequence, if the cross-correlation calculation result has an obvious maximum value, whether a radioactive source exists in the detection range can be judged, the cross-correlation algorithm can obviously eliminate the interference of the nuclear radiation background of the natural environment to the measurement data, compared with the existing source searching system, the source searching system can improve the source searching distance by 1.5 times to 2.5 times, obviously improve the distance for searching the radioactive source, find the radioactive source in time and reduce the probability of radiation accidents.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a schematic diagram of a method for increasing a search source distance based on a cross-correlation technique according to the present application, which employs pulse counting;
fig. 2 is a schematic diagram of voltage sampling adopted in the method for increasing the search source distance based on the cross-correlation technique.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1-2, the method for increasing the search distance based on the cross-correlation technique provided by the present application includes the following steps: step 1, arranging two or more than two nuclear radiation detectors; step 2, performing pulse shaping preprocessing or voltage filtering preprocessing on the detected signal through a signal preprocessing circuit; step 3, counting pulse signals of the signals processed in the step 2 through a counter or sampling voltage signals through an analog-to-digital converter; step 4, acquiring a pulse signal output by a counter or a voltage signal output by an analog-to-digital converter through a signal acquisition and cross-correlation calculation module, and performing cross-correlation calculation on the pulse signal or the voltage signal; and 5, determining the existence of the radioactive source when the cross-correlation calculation result has a local maximum value.
Specifically, according to the method for increasing the source searching distance based on the cross-correlation technique provided by the embodiment of the present application, two or more nuclear radiation detectors are provided, the nuclear radiation detectors are mainly used for collecting radioactive source signals, each nuclear radiation detector is connected to a signal preprocessing circuit, and the signal preprocessing circuit is mainly used for preprocessing the radioactive source signals. Through the signal that pulse shaping was handled, follow-up can get into the counter, produces the pulse count in the fixed time through the counter, and the signal after the count can be transmitted to gather and cross-correlation calculation module carries out the calculation processing, and through the signal that voltage filtering was handled, follow-up can get into analog to digital converter, produces the voltage signal that changes through analog to digital converter, and voltage signal can transmit to gather and cross-correlation calculation module equally and carry out the calculation processing. The cross-correlation calculation is mainly characterized in that a plurality of nuclear radiation detectors monitor the same radioactive source, generated data signals are divided in time, the time difference is particularly related to the installation positions of the nuclear radiation detectors, cross-correlation calculation is carried out by utilizing data signal flows with similar shapes and time, if the cross-correlation calculation result has an obvious maximum value, whether the radioactive source exists in a detection range can be judged, interference of nuclear radiation background of natural environment on measurement data can be obviously eliminated by adopting a cross-correlation algorithm, compared with the existing source searching system, the source searching distance of 1.5 times to 2.5 times can be increased, the distance for searching the radioactive source is obviously increased, the radioactive source can be found in time, and the probability of radiation accidents is reduced.
Further, the nuclear radiation detector is mounted on the motion platform. The two-path or multi-path nuclear radiation detector can be arranged on the same moving platform or different moving platforms, and can carry out multi-point acquisition and detection on the radioactive source in a certain area in real time by being arranged on the moving platform.
Further, the cross-correlation calculation includes a generalized cross-correlation algorithm and a pole zero cross-correlation algorithm or other cross-correlation algorithms. The signal acquisition and cross-correlation calculation module can realize the conversion of signal data and cross-correlation calculation by utilizing the combination of devices such as a high-speed single chip microcomputer, a digital signal processor, a field programmable device and the like according to actual conditions, the cross-correlation algorithm can perform the cross-correlation processing of data signals through a plurality of cross-correlation algorithms such as generalized cross-correlation, extreme zero cross-correlation and the like, and the cross-correlation calculation is performed by utilizing data streams with similar shapes and successive times in time, so that the interference of the nuclear radiation background of the natural environment on the measured data can be obviously eliminated, compared with the existing source searching system, the source searching distance can be increased by 1.5 times to 2.5 times, and the distance for searching.
The present application will be described more specifically with reference to the following specific examples:
example 1
As shown in fig. 1, in the embodiment of the present application, the detector 1 and the detector 2 are nuclear radiation detectors, and a preamplifier and other auxiliary circuits are arranged inside the nuclear radiation detectors; the signal preprocessing circuit 1 and the signal preprocessing circuit 2 are pulse shaping circuits, and process pulses into pulse signals which can be received by a counter behind; the counter 1 and the counter 2 respectively count the two paths of pulse signals; the signal acquisition and cross-correlation calculation module acquires signals output by the counter, cross-correlation calculation is carried out on the two paths of output signal data, and when a local maximum value appears in a cross-correlation calculation result, the existence of a radioactive source can be determined.
Example 2
As shown in fig. 2, in the embodiment of the present application, the detector 1 and the detector 2 are nuclear radiation detectors, and a preamplifier and other auxiliary circuits are arranged inside the nuclear radiation detectors; the signal preprocessing circuit 1 and the signal preprocessing circuit 2 are voltage filtering circuits, and noise is removed after voltage filtering; the analog-to-digital converter 1 and the analog-to-digital converter 2 respectively sample two paths of voltage signals; the signal acquisition and cross-correlation calculation module acquires signals output by the analog-to-digital converter, cross-correlation calculation is carried out on the two paths of output signal data, and when the cross-correlation calculation result has a maximum value, the existence of a radioactive source can be determined.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art without departing from the spirit and principle of the present application, and any modifications, equivalents, improvements, etc. made therein are intended to be included within the scope of the present application.
Claims (6)
1. A method for improving the source searching distance based on the cross-correlation technology is characterized by comprising the following steps:
step 1, arranging two or more than two nuclear radiation detectors;
step 2, preprocessing the detected signal through a signal preprocessing circuit;
step 3, counting the pulse signals of the signals processed in the step 2 through a counter;
step 4, acquiring the pulse signals output by the counter through a signal acquisition and cross-correlation calculation module, and performing cross-correlation calculation on the pulse signals;
and 5, determining the existence of the radioactive source when the cross-correlation calculation result has a local maximum value.
2. The method for increasing the search distance based on the cross-correlation technique as claimed in claim 1, wherein the signal preprocessing circuit in step 2 is a pulse shaping circuit.
3. A method for improving the source searching distance based on the cross-correlation technology is characterized by comprising the following steps:
step 1, arranging two or more than two nuclear radiation detectors;
step 2, preprocessing the detected signal through a signal preprocessing circuit;
step 3, sampling the voltage signal of the signal processed in the step 2 through an analog-to-digital converter;
step 4, acquiring voltage signals output by the analog-to-digital converter through a signal acquisition and cross-correlation calculation module, and performing cross-correlation calculation on the voltage signals;
and 5, determining the existence of the radioactive source when the cross-correlation calculation result has a maximum value.
4. The method for increasing the search source distance based on the cross-correlation technique as claimed in claim 3, wherein the signal preprocessing circuit in step 2 is a voltage filter circuit.
5. The method for improving the source finding distance based on the cross-correlation technique as claimed in any one of claims 1 or 3, wherein the nuclear radiation detector is mounted on a moving platform.
6. A method for improving the homing distance based on cross-correlation technique as claimed in any one of claims 1 or 3, wherein said cross-correlation calculation comprises a generalized cross-correlation algorithm and a pole-zero cross-correlation algorithm or other cross-correlation algorithms.
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Application publication date: 20210514 |