CN112099074A - Temperature drift correction method and system - Google Patents
Temperature drift correction method and system Download PDFInfo
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- CN112099074A CN112099074A CN202010973710.8A CN202010973710A CN112099074A CN 112099074 A CN112099074 A CN 112099074A CN 202010973710 A CN202010973710 A CN 202010973710A CN 112099074 A CN112099074 A CN 112099074A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/361—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with a combination of detectors of different types, e.g. anti-Compton spectrometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/40—Stabilisation of spectrometers
Abstract
The invention provides a method and a system for correcting temperature drift, which comprises the following steps: establishing a regression curve between energy peak positions and temperature points of the radioactive ray detector at different temperatures; performing energy spectrum identification on the signal output by the radioactive ray detector, and acquiring an energy spectrum S and a temperature T in real time; and searching the energy peak position of the corresponding radioactive ray under the temperature T through the regression curve, calculating and identifying the difference value between the energy peak position and the energy spectrum S, and correcting the energy spectrum S by using the difference value. According to the invention, the influence of temperature on an energy spectrum is counteracted through the compensation mathematical model, the problems that the output signal has temperature drift to influence the dosage rate and the accuracy of nuclide identification caused by the temperature sensitivity of the detector are solved, and the accuracy of nuclide identification and dosage rate is ensured.
Description
Technical Field
The invention relates to the technical field of radioactivity detection, in particular to a temperature drift correction method and system.
Background
In the field of safety detection and anti-terrorism, radioactive radiation detection is an important component, and a nuclide identifier, a dose rate meter and a radioactive source patrol instrument are main instruments for radioactive radiation detection. The nuclide identification instrument can judge the type and radiation level of the radionuclide and has the function of searching and positioning the radioactive source.
The gamma detector of the existing nuclide identification instrument consists of a CsI crystal + SiPM array and a peripheral circuit, wherein the SiPM (silicon photon multiplexer) is a novel photoelectric detector and consists of an avalanche diode array working in a Geiger mode, and has the characteristics of high gain, high sensitivity, low bias voltage, insensitivity to a magnetic field, compact structure and the like. The technology adopts a design concept of micro electronics, integrates an SiPM array on a small plate, and mounts a CsI crystal on the array by adopting a special process. The CsI detects gamma rays to generate photoelectric signals, weak photoelectric signals are amplified and output through the SiPM array, and a signal acquisition circuit behind the SiPM array is convenient to acquire and process. The CsI crystal is a scintillation crystal which takes cesium iodide as a matrix material, is a colorless and transparent cubic crystal, and is characterized by high density, high average atomic number and higher detection efficiency on gamma rays and X rays.
However, SiPM arrays are susceptible to temperature and can easily cause the signal output by the detector to drift, thereby affecting the dose rate and accuracy of nuclide identification.
Disclosure of Invention
In view of this, the object of the invention is: the problem that temperature drift of output signals due to the sensitivity of the detector to temperature affects the dosage rate and the accuracy of nuclide identification is solved, and the accuracy of nuclide identification and dosage rate is guaranteed.
The invention provides a correction method of temperature drift, which comprises the following steps:
establishing a regression curve between energy peak positions and temperature points of the radioactive ray detector at different temperatures;
performing energy spectrum identification on the signal output by the radioactive ray detector, and acquiring an energy spectrum S and a temperature T in real time;
and searching the energy peak position of the corresponding radioactive ray under the temperature T through the regression curve, calculating and identifying the difference value between the energy peak position and the energy spectrum S, and correcting the energy spectrum S by using the difference value.
Further, the regression curve is established according to the property that the signal amplitude of the detector and the temperature show negative correlation; before the regression curve is established, a detector collects radioactive ray energy spectrums at different temperatures and records energy peak positions at different temperatures.
Further, the recording of the energy peak positions at different temperatures is obtained by collecting drift data of the energy peaks of the temperature and the radiation detector through a test of the temperature and the amplitude output of the detector.
Further, in the process of correcting the energy spectrum S by using the difference value, a compensation mathematical model of the temperature and the energy spectrum is established according to the corresponding relation between the signal amplitude output by the detector at different temperature points and the radioactive ray energy spectrum.
Further, in the process of correcting the energy spectrum S by using the difference value, the method also comprises the step of automatically calculating a temperature drift correction coefficient through the input temperature of the compensation mathematical model so as to improve the correction precision.
The system of the correction method of the temperature drift comprises the following steps:
a detector module: the detector collects radioactive ray energy spectrums at different temperatures and records energy peak positions at different temperatures;
the energy spectrum identification module: acquiring the radioactive ray energy spectrum to be identified through the detector channel, extracting energy spectrum characteristic vectors, and classifying to realize energy spectrum identification;
a compensation mathematical model module: and establishing a temperature and energy spectrum compensation mathematical model according to the corresponding relation between the signal amplitude output by the detector and the radioactive ray energy spectrum at different temperature points.
Further, the system also comprises a temperature drift correction module: and automatically calculating a temperature drift correction coefficient according to the input temperature of the compensation mathematical model.
The invention also provides an energy spectrum identification system for correcting the temperature drift, which comprises:
the circuit board is provided with an acquisition circuit module, a signal processing module and a power supply module in an integrated manner;
the acquisition circuit module is designed by adopting an independent layered circuit board, is a signal acquisition circuit device, is arranged at the lower part of the circuit board and is used for completing channel selection, amplification, gain control and A/D conversion of a measurement input signal, and the acquisition circuit module is designed by adopting the independent layered circuit board, so that the utilization rate of the board area is fully improved, and the signal integrity is ensured;
the signal processing module comprises an FPGA device, an ARM device, an SRAM device and a Flash device which are arranged in the middle of the circuit board; the FPGA device is connected with the ARM device, the FPGA device is connected with the Flash device, and the FPGA device is connected with the SRAM device; the FPGA device can be applied to digital signal processing with the advantages of high speed, real time, low cost and high flexibility, the digital signal processing realized by the FPGA becomes a new trend in the field of digital signal processing, and the FPGA device can replace a general DSP chip or be used as a coprocessor of the general DSP chip to work;
the acquisition circuit module is connected with the signal processing module, and the signal processing module is connected with the Bluetooth module;
the power module comprises a lithium battery, a wireless charging device and a TypeC device, and is arranged on the outer upper left side of the circuit board to realize the separated layout of strong and weak electricity, and the power module is connected with the signal processing module.
Furthermore, the energy spectrum identification system also comprises a detector module, wherein the detector module comprises a CsI detector and a neutron detector, the CsI detector and the neutron detector are arranged on the outer lower side of the circuit board, and the detector module is connected with the acquisition circuit module; the detector module is used for searching and detecting a radioactive source and measuring radioactive radiation dosage rate, preferably, the radioactive radiation dosage rate comprises absorption dosage rate, kerma rate, peripheral dose equivalent rate and directional dose equivalent rate.
The invention provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of correction of temperature drift.
The invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method for correcting temperature drift when executing the program.
Compared with the prior art, the invention has the advantages that the influence of temperature on an energy spectrum is counteracted through the compensation mathematical model, the problems that the output signal has temperature drift to influence the dosage rate and the accuracy of nuclide identification caused by the temperature sensitivity of the detector are solved, and the accuracy of nuclide identification and dosage rate is ensured.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
In the drawings:
FIG. 1 is a flow chart of a method for correcting temperature drift according to the present invention;
FIG. 2 is a schematic structural diagram of a computer device according to an embodiment of the present invention;
FIG. 3 is a graph illustrating the relationship between the temperature and the peak value of Cs137 according to an embodiment of the present invention;
FIG. 4 is a flow chart of an embodiment of the present invention before the regression curve is established;
fig. 5 is a flowchart after the energy spectrum S is corrected according to the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and products consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a method for correcting temperature drift.
The embodiment of the invention provides a correction method of temperature drift, which comprises the following steps:
s1, establishing a regression curve between energy peak positions and temperature points of the radiation detector at different temperatures;
the regression curve shows a property of negative correlation according to the signal amplitude and the temperature of the detector;
preferably, the present embodiment collects gamma energy spectra at different temperatures, and according to the property that the signal amplitude of the sipms and the temperature exhibit negative correlation, and according to the corresponding relationship between the amplitude of the output of the sipms array at different temperature points and the gamma energy spectra.
S2, performing energy spectrum identification on the signal output by the radiation detector, and acquiring an energy spectrum S and a temperature T in real time;
preferably, the embodiment collects the energy spectrum S and the temperature T through Cs137 energy spectrum recognition;
s3, finding the energy peak position of the corresponding radioactive ray under the temperature T through the regression curve, calculating and identifying the difference value between the energy peak position and the energy spectrum S, and correcting the energy spectrum S by using the difference value;
preferably, in the embodiment, the energy peak position of the Cs137 at the temperature T is found, the difference between the energy peak position and the energy spectrum S is calculated and identified, the energy spectrum S is subjected to overall offset by using the difference, and the influence of the temperature on the energy spectrum is cancelled after the acquired energy spectrum S is subjected to overall offset.
And in the process of correcting the energy spectrum S by using the difference, establishing a compensation mathematical model of the temperature and the energy spectrum according to the corresponding relation between the signal amplitude output by the detector and the radioactive ray energy spectrum at different temperature points.
And in the process of correcting the energy spectrum S by using the difference value, the step of automatically calculating a temperature drift correction coefficient through the input temperature of the compensation mathematical model is further included so as to improve the correction precision.
Referring to fig. 4, before the step of establishing the regression curve in step S1, the method further includes the following steps:
s11, collecting radioactive ray energy spectrums at different temperatures by a detector, and recording energy peak positions at different temperatures;
preferably, the energy spectrum of the Cs137 at different temperatures is acquired by the detector, and the energy peak position is recorded, referring to the attached figure 3.
S12, recording energy peak positions at different temperatures, and collecting temperature and energy peak drift data of the radiation detector through the test of temperature and amplitude output of the detector;
preferably, the present embodiment records the energy peak positions at different temperatures, and collects the temperature and gamma detector energy peak drift data through the test of the temperature and the amplitude output of the SiPM.
Referring to fig. 5, after the step S3, the method further includes the following steps:
s31, identifying the energy spectrum after temperature correction;
s32, verifying the stability of energy spectrum identification through high and low temperature tests;
specifically, in the embodiment, the peak Cs137 is located in lane 197 and deviates from the standard lane 220 without temperature compensation, which results in the failure of nuclide identification.
After adding the temperature compensation calculation, the peak is corrected around 220 passes and the species Cs137 is successfully identified. Through high and low temperature tests, the peak position of the 137Cs source is kept at 220 +/-10 tracks, the nuclide identification function of the nuclide identification spectrometer is stable and is not influenced by temperature, and the defect that the SiPM is sensitive to the environmental temperature is overcome.
The system of the correction method of the temperature drift comprises the following steps:
a detector module: the detector collects radioactive ray energy spectrums at different temperatures and records energy peak positions at different temperatures;
the energy spectrum identification module: acquiring the radioactive ray energy spectrum to be identified through the detector channel, extracting energy spectrum characteristic vectors, and classifying to realize energy spectrum identification;
a compensation mathematical model module: and establishing a temperature and energy spectrum compensation mathematical model according to the corresponding relation between the signal amplitude output by the detector and the radioactive ray energy spectrum at different temperature points.
The system also comprises a temperature drift correction module: and automatically calculating a temperature drift correction coefficient according to the input temperature of the compensation mathematical model.
The invention also provides an energy spectrum identification system for correcting the temperature drift, which comprises:
the circuit board is provided with an acquisition circuit module, a signal processing module and a power supply module in an integrated manner;
the acquisition circuit module is designed by adopting an independent layered circuit board, is a signal acquisition circuit device, is arranged at the lower part of the circuit board and is used for completing channel selection, amplification, gain control and A/D conversion of a measurement input signal, and the acquisition circuit module is designed by adopting the independent layered circuit board, so that the utilization rate of the board area is fully improved, and the signal integrity is ensured;
the signal processing module comprises an FPGA device, an ARM device, an SRAM device and a Flash device which are arranged in the middle of the circuit board; the FPGA device is connected with the ARM device, the FPGA device is connected with the Flash device, and the FPGA device is connected with the SRAM device; the FPGA device can be applied to digital signal processing with the advantages of high speed, real time, low cost and high flexibility, the digital signal processing realized by the FPGA becomes a new trend in the field of digital signal processing, and the FPGA device can replace a general DSP chip or be used as a coprocessor of the general DSP chip to work;
the acquisition circuit module is connected with the signal processing module, and the signal processing module is connected with the Bluetooth module;
the power module comprises a lithium battery, a wireless charging device and a TypeC device, and is arranged on the outer upper left side of the circuit board to realize the separated layout of strong and weak electricity, and the power module is connected with the signal processing module.
Furthermore, the energy spectrum identification system also comprises a detector module, wherein the detector module comprises a CsI detector and a neutron detector, the CsI detector and the neutron detector are arranged on the outer lower side of the circuit board, and the detector module is connected with the acquisition circuit module; the detector module is used for searching and detecting a radioactive source and measuring radioactive radiation dosage rate, preferably, the radioactive radiation dosage rate comprises absorption dosage rate, kerma rate, peripheral dose equivalent rate and directional dose equivalent rate.
Compared with the prior art, the invention has the advantages that the influence of temperature on an energy spectrum is counteracted through the compensation mathematical model, the problems that the output signal has temperature drift to influence the dosage rate and the accuracy of nuclide identification caused by the temperature sensitivity of the detector are solved, and the accuracy of nuclide identification and dosage rate is ensured.
The embodiment of the invention also provides computer equipment which can integrate the temperature drift correction method provided by the embodiment of the invention; FIG. 2 is a schematic structural diagram of a computer device according to an embodiment of the present invention; referring to fig. 2, the computer apparatus includes: an input device 23, an output device 24, a memory 22 and a processor 21; the memory 22 for storing one or more programs; when the one or more programs are executed by the one or more processors 21, the one or more processors 21 implement the control method for securing the internet of things according to the embodiment; wherein the input device 23, the output device 24, the memory 22 and the processor 21 may be connected by a bus or other means, as exemplified by the bus connection in fig. 2.
The memory 22 is used as a readable and writable storage medium of a computing device, and may be used to store a software program, a computer executable program, and a program instruction corresponding to the control method for the security protection internet of things according to the embodiment of the present invention; the memory 22 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the device, and the like; further, the memory 22 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device; in some examples, the memory 22 may further include memory located remotely from the processor 21, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 23 may be used to receive input numeric or character information and to generate key signal inputs relating to user settings and function control of the apparatus; the output device 24 may include a display device such as a display screen.
The processor 21 executes various functional applications of the device and data processing by executing software programs, instructions and modules stored in the memory 22, that is, implements one of the above-described temperature drift correction methods.
The computer device provided above can be used to execute the method for correcting temperature drift provided in the above embodiments, and has corresponding functions and advantages.
Embodiments of the present invention also provide a storage medium containing computer-executable instructions for performing a method for correcting temperature drift as provided in the above embodiments when executed by a computer processor, the storage medium being any of various types of memory devices or storage devices, the storage medium comprising: mounting media such as CD-ROM, floppy disk, or tape devices; computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Lanbas (Rambus) RAM, etc.; non-volatile memory such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc.; the storage medium may also include other types of memory or combinations thereof; in addition, the storage medium may be located in a first computer system in which the program is executed, or may be located in a different second computer system connected to the first computer system through a network (such as the internet); the second computer system may provide program instructions to the first computer for execution. A storage medium includes two or more storage media that may reside in different locations, such as in different computer systems connected by a network. The storage medium may store program instructions (e.g., embodied as a computer program) that are executable by one or more processors.
Of course, the storage medium provided by the embodiment of the present invention includes computer-executable instructions, and the computer-executable instructions are not limited to the method for correcting the temperature drift described in the above embodiment, and may also perform a method for correcting the temperature drift provided by any embodiment of the present invention.
Technical solutions of the present invention have been described with reference to preferred embodiments shown in the drawings, but it is apparent that the scope of the present invention is not limited to these specific embodiments, as will be readily understood by those skilled in the art. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for correcting temperature drift is characterized by comprising the following steps:
establishing a regression curve between energy peak positions and temperature points of the radioactive ray detector at different temperatures;
performing energy spectrum identification on the signal output by the radioactive ray detector, and acquiring an energy spectrum S and a temperature T in real time;
and searching the energy peak position of the corresponding radioactive ray under the temperature T through the regression curve, calculating and identifying the difference value between the energy peak position and the energy spectrum S, and correcting the energy spectrum S by using the difference value.
2. The method according to claim 1, wherein the regression curve is established based on the property that the signal amplitude of the detector is inversely related to the temperature.
3. The method for correcting temperature drift according to claim 1, wherein the recording of the energy peak positions at different temperatures is obtained by collecting data of the drift of the energy peaks of the temperature and the radiation detector through a test of the temperature and the amplitude output of the detector.
4. The method according to claim 1, wherein a mathematical model for temperature and energy spectrum compensation is established according to the corresponding relationship between the signal amplitude output by the detector at different temperature points and the radiation energy spectrum during the process of correcting the energy spectrum S by using the difference.
5. The method for correcting temperature drift according to claim 4, wherein the step of correcting the energy spectrum S by using the difference value further comprises the step of automatically calculating a temperature drift correction coefficient according to the input temperature of the compensation mathematical model.
6. The system of the method for correcting temperature drift according to any one of claims 1 to 5, comprising:
a detector module: the detector collects radioactive ray energy spectrums at different temperatures and records energy peak positions at different temperatures;
the energy spectrum identification module: acquiring the radioactive ray energy spectrum to be identified through the detector channel, extracting energy spectrum characteristic vectors, and classifying to realize energy spectrum identification;
a compensation mathematical model module: and establishing a temperature and energy spectrum compensation mathematical model according to the corresponding relation between the signal amplitude output by the detector and the radioactive ray energy spectrum at different temperature points.
7. The system of claim 6, further comprising a temperature drift correction module: and automatically calculating a temperature drift correction coefficient according to the input temperature of the compensation mathematical model.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for correcting a temperature drift according to any one of claims 1 to 5.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for correcting a temperature drift according to any one of claims 1 to 5 when executing said program.
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