CN114464060B - Ray absorption virtual simulation experiment system and method - Google Patents
Ray absorption virtual simulation experiment system and method Download PDFInfo
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- CN114464060B CN114464060B CN202210208027.4A CN202210208027A CN114464060B CN 114464060 B CN114464060 B CN 114464060B CN 202210208027 A CN202210208027 A CN 202210208027A CN 114464060 B CN114464060 B CN 114464060B
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Abstract
The invention discloses a ray absorption virtual simulation experiment system and a method, comprising the following steps: the radioactive source simulator, the intelligent object stage and the nuclear probe simulator are sequentially connected; the radioactive source simulator is used for simulating a real radioactive source and transmitting the type information of the radioactive source to the intelligent objective table; the intelligent object stage is used for simulating a real object stage, automatically acquiring the types and the quantity of the absorption sheets, packaging the types and the quantity of the absorption sheets and the type information of the radioactive source, and then sending the packaged types and quantity information to the nuclear probe simulator; the nuclear probe controller in the nuclear probe simulator obtains working high-voltage information through a working high-voltage measuring circuit, reads simulation data in a simulation data source memory in combination with the radiation source type information, generates rectangular voltage pulses according to the type and the number of the absorption sheets and the simulation data, and sends the rectangular voltage pulses to a filter forming circuit to obtain a nuclear-simulated voltage pulse signal. The experimental function of ray absorption is realized, and the experimental effect identical to that of a real experimental system is achieved.
Description
Technical Field
The invention relates to the technical field of radiation absorption experiments, in particular to a radiation absorption virtual simulation experiment system and method.
Background
The statements in this section merely relate to the background of the present disclosure and may not necessarily constitute prior art.
The gamma-ray absorption experiment is largeAn important project in the modern physics experiments is learned, and the experimental project not only can verify the absorption rule of the narrow beam gamma rays in the substances, but also provides a measurement method of the absorption coefficient of the gamma ray substances. During the experiment, use is needed 60 Co and 137 because the radiation source has certain harm to the environment and human body, the Cs two nuclear radiation sources have strict regulation on the nuclear radiation source, and limit the opening of the experimental project.
In order to solve the above problems, many people now try to simulate the process of the nuclear physical experiment by adopting methods such as software simulation or nuclear signal source simulation. Although the simulation systems can realize the purpose of the physical experiment without the radionuclides, students cannot obtain the same experiment experience as a real experiment system on the simulation systems, and the simulation effect is poor, which is unfavorable for experimental literacy and culture of experimental capability.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a ray absorption virtual simulation experiment system and a method, which can achieve the effect of virtual simulation and provide a relatively real experiment experience for experimenters.
In a first aspect, the present invention provides a radiation absorption virtual simulation experiment system;
a radiation absorption virtual simulation experiment system comprises a radioactive source simulator, an intelligent objective table and a nuclear probe simulator which are connected in sequence;
the radioactive source simulator is used for simulating a real radioactive source and transmitting the type information of the radioactive source to the intelligent objective table;
the intelligent object stage is used for simulating a real object stage, automatically acquiring the types and the quantity of the absorption sheets, packaging the types and the quantity of the absorption sheets and the type information of the radioactive source, and then sending the packaged types and quantity information to the nuclear probe simulator;
the nuclear probe simulator is used for simulating a real nuclear probe and consists of a nuclear probe controller, a working high-voltage measuring circuit, a simulation data source memory, a nuclear probe simulator encoder and a filtering forming circuit, wherein the working high-voltage measuring circuit, the simulation data source memory, the nuclear probe simulator encoder and the filtering forming circuit are respectively connected with the nuclear probe controller; the nuclear probe controller acquires working high-voltage information through the working high-voltage measuring circuit, reads simulation data in the simulation data source memory in combination with the radiation source type information, calculates an absorption threshold according to the type and the number of the absorption sheets, generates a uniformly distributed pseudo-random number, determines whether rectangular voltage pulses are generated through comparison of the pseudo-random number and the absorption threshold, generates rectangular voltage pulses based on the simulation data if the rectangular voltage pulses are generated, and sends the rectangular voltage pulses to the filter forming circuit to obtain a nuclear-simulated voltage pulse signal.
Further, the radioactive source simulator consists of a radioactive source controller, and a radioactive source information encoder, a radioactive source simulator encoder and an infrared communication transmitting circuit which are respectively connected with the radioactive source controller.
Further, the intelligent objective table comprises an objective table controller, and an absorption sheet detection device, an intelligent objective table encoder and an infrared communication receiving chip which are respectively connected with the objective table controller.
Further, the absorption sheet detecting device includes a stage and a gravity measuring sensor disposed directly under the stage.
Further, the absorbent sheet detecting apparatus includes a holder and a displacement measuring sensor connected to the holder.
Further, the absorption sheet detection equipment is formed by a plurality of absorption sheet limit grooves and photoelectric switch sensors in a crossed mode, and the absorption sheet limit grooves are designed into different shapes according to the shapes of the absorption sheets to be measured.
Further, the filter forming circuit is also connected with an energy spectrometer;
the filter forming circuit sends the simulated nuclear voltage pulse signal to the energy spectrometer;
the energy spectrometer is used for carrying out amplitude analysis on the simulated nuclear voltage pulse signal to obtain the energy spectrum of the radioactive source.
Further, the energy spectrometer is also connected with a terminal;
the terminal is used for displaying the energy spectrum of the radioactive source.
Furthermore, the working high-voltage measuring circuit consists of a voltage dividing circuit and an ADC chip which are connected in sequence.
In a second aspect, the invention provides a ray absorption virtual simulation experiment method;
a radiation absorption virtual simulation experiment method comprises the following steps:
the radioactive source simulator simulates a real radioactive source and transmits the type information of the radioactive source to the intelligent objective table;
the intelligent object stage simulates a real object stage, automatically acquires the types and the numbers of the absorption sheets, packages the types and the numbers of the absorption sheets and the type information of the radioactive source, and sends the packaged types and the numbers of the absorption sheets and the type information of the radioactive source to the nuclear probe simulator;
the nuclear probe controller in the nuclear probe simulator obtains working high-voltage information through a working high-voltage measuring circuit, reads simulation data in a simulation data source memory in combination with the radiation source type information, calculates an absorption threshold value according to the type and the number of absorption sheets, generates a uniformly distributed pseudo-random number at the same time, determines whether to generate rectangular voltage pulses through comparison of the pseudo-random number and the absorption threshold value, generates rectangular voltage pulses based on the simulation data if the rectangular voltage pulses are generated, and sends the rectangular voltage pulses to a filter forming circuit to obtain a nuclear-simulated voltage pulse signal.
Compared with the prior art, the invention has the beneficial effects that:
the radiation absorption virtual simulation experiment system can realize automatic detection of working high pressure, radiation source type, absorbing substance type and thickness, generate nuclear-simulated voltage pulse conforming to specific energy spectrum, achieve virtual simulation effect and provide more real experiment experience for experimenters.
The ray absorption virtual simulation experiment system has strong expansion capability, enriches the types of absorption substances by expanding data sources, and can complete absorption experiments of substances except aluminum and lead.
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The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a ray absorption virtual simulation experiment system according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a weight-measuring intelligent stage according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a thickness measurement type intelligent stage according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a limit slot photoelectric detection type intelligent object stage according to a first embodiment of the present invention;
FIG. 5 (a) is a diagram illustrating the spectrum measurement result according to the first embodiment of the present invention;
fig. 5 (b) is a schematic diagram showing the processing results of the radiation absorption experiment according to the first embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
All data acquisition in the embodiment is legal application of the data on the basis of meeting laws and regulations and agreements of users.
Example 1
The embodiment provides a ray absorption virtual simulation experiment system;
as shown in FIG. 1, the radiation absorption virtual simulation experiment system comprises a radioactive source simulator, an intelligent object stage, a nuclear probe simulator, a pulse amplitude analyzer (energy spectrometer) and a terminal (PC) which are sequentially connected. Infrared wireless transmission is adopted between the radioactive source simulator and the intelligent object stage.
The radioactive source simulator is used for simulating a real radioactive source and transmitting radioactive source type information to the intelligent objective table. The radioactive source simulator replaces a nuclear radioactive source in a real experiment system, namely a collimation gamma radioactive source, and consists of a radioactive source controller, a radioactive source information encoder, a radioactive source simulator encoder and an infrared communication transmitting circuit, wherein the radioactive source information encoder, the radioactive source simulator encoder and the infrared communication transmitting circuit are respectively connected with the radioactive source controller. The radioactive source controller is respectively connected with the radioactive source information encoder and the radioactive source simulator encoder and is connected with the infrared communication transmitting circuit through a CH1 channel of the peripheral Timer1 and a TX channel of the UART 1. The radioactive source controller obtains the radioactive source type information and the radioactive source simulator code by reading the states of the radioactive source information encoder and the radioactive source simulator encoder, and transmits 38k infrared communication signals to the intelligent object stage through the infrared communication transmitting circuit at regular time. The radiation source simulator codes are used for avoiding mutual interference among different simulation experiment systems, and each radiation simulator in one room is provided with independent codes, so that the response of different intelligent object stages to infrared signals of other experiment systems can be avoided. The source signal is one byte and the source simulator is encoded in one byte.
In order to achieve the virtual simulation effect of the radioactive source, besides the appearance consistent with that of the collimated gamma radioactive source, the radioactive source simulator also needs to have the following functions: (1) gamma-ray collimation optical characteristics; (2) The box cover is opened, the simulation experiment system can obtain the energy spectrum of the corresponding radioactive source, the box cover is closed, the simulation experiment system can obtain the background energy spectrum, particularly, the box cover of the radioactive source simulator is opened, infrared rays are emitted, the intelligent objective table can receive infrared signals, and the corresponding radioactive source energy spectrum of corresponding working high pressure is generated; if the intelligent object stage is not opened, infrared rays cannot be emitted, the intelligent object stage cannot receive infrared signals, and background energy spectrum of corresponding working high pressure is generated.
Infrared rays are used as an information carrier, and an infrared transmitting tube is buried in a deep position of an output port of the radioactive source simulator, so that the collimation optical characteristics of the radioactive source simulator can be ensured. The main task of the radioactive source simulator is to send the information of the radioactive source type and to adopt a high-stability 38KHz infrared carrier communication mode. As shown in FIG. 1, a CH1 channel of a peripheral Timer1 of the radiation source controller generates a 38KHz carrier signal to control the switching of a transistor T1 in an infrared communication transmitting circuit. The data to be transmitted is transmitted by a TX output control transistor T2 of a peripheral UART1, and an infrared luminotron D realizes 38KHz infrared carrier communication transmission under the joint control of T1 and T2.
The intelligent objective table is used for simulating a real objective table, automatically acquiring the types and the quantity of the absorption sheets, packaging the types and the quantity of the absorption sheets and the type information of the radioactive source, and then sending the packaged types and quantity information to the nuclear probe simulator. The intelligent object table replaces an absorber object table in a real experiment system and consists of an object table controller, and an absorption sheet detection device, an intelligent object table encoder and an infrared communication receiving chip which are respectively connected with the object table controller. The infrared communication receiving chip receives the infrared communication signal transmitted by the infrared communication transmitting circuit, and the object stage controller is connected with the infrared communication receiving chip through an RX channel of an external USART 1; the objective table controller is also connected with the photoelectric switch sensor group and the intelligent objective table encoder. The object stage controller obtains the type information of the radioactive source by reading serial data of the infrared communication receiving chip; the type and the number of the absorbing objects are obtained by reading the state of the absorbing sheet detection equipment, and finally the two information (the type information of the radioactive source and the type and the number of the absorbing sheets) are encoded and transmitted to the nuclear probe simulator through a TX channel of the external USART 2. To realize the virtual simulation of gamma ray absorption, the simulation experiment system should have the function of automatically detecting the type and thickness of the absorption object.
The other function of the intelligent object stage is an information transfer station, the object stage controller firstly reads data of an infrared communication receiving chip through the USART1 peripheral equipment to obtain radioactive source type information, then packages the type and number information of the absorption sheet and the radioactive source type information (namely encodes the type and number information of the absorption sheet and the radioactive source type information through the intelligent object stage encoder), and finally sends the information to the nuclear probe simulator through the USART2 peripheral equipment (a data transmission line adopts a fixed column to penetrate and hide).
The intelligent objective table is a component for realizing automatic detection of the types and the numbers of the absorption sheets. The method for realizing the absorption sheet detection equipment comprises three types of weight measurement type, thickness measurement type or limit groove photoelectric detection type, so that the weight measurement type intelligent objective table, the thickness measurement type intelligent objective table and the limit groove photoelectric detection type intelligent objective table are obtained. The structure of the weight measurement type absorption sheet detection device is shown in fig. 2, and the weight measurement type absorption sheet detection device comprises an objective table and a weight measurement sensor arranged under the objective table, an absorption object is placed on the objective table, the weight of the object is obtained through the weight measurement sensor and is transmitted to an objective table controller, the objective table controller stores weight meters, different weights correspond to different types of absorption sheets with specific numbers, and then information such as the type and the number of the absorption object is obtained. The structure of the thickness measuring type absorbing sheet detecting device is shown in fig. 3, and the thickness measuring type absorbing sheet detecting device comprises a holder and a displacement measuring sensor connected with the holder, an absorbing object is placed in the holder, the total thickness of the object in the holder is obtained through the displacement sensor connected with the holder and is transmitted to a stage controller, the stage controller stores thickness tables, different thicknesses correspond to a specific number of different types of absorbing sheets, and information such as the type and the number of the absorbing object is obtained. The top view of the limit groove photoelectric detection type absorption sheet detection device is shown in fig. 4, the limit groove photoelectric detection type absorption sheet detection device is formed by intersecting 10 absorption sheet limit grooves and 10 photoelectric switch sensors, the absorption sheet limit grooves are designed into different shapes according to the absorption sheet shapes measured as required, part of the absorption sheet limit grooves are designed into thick and short shapes as aluminum absorption sheet limit grooves according to the absorption sheet shapes, and part of the absorption sheet limit grooves are designed into slender shapes as lead absorption sheet limit grooves. And a correlation photoelectric switch sensor is arranged in the limit groove, and the photoelectric switch sensor is used for detecting whether an absorption sheet exists in the limit groove. The stage controller can determine the type and number of the absorbing sheets by reading the states of the 10 photoelectric switch sensors. And detecting whether an absorption sheet is put into the limit groove or not through the photoelectric switch sensor, if the absorption sheet is put into the limit groove, outputting an effective signal (high level) corresponding to the photoelectric switch sensor, otherwise, outputting an ineffective signal (low level). By reading the codes corresponding to the output signals of the photoelectric switch sensor groups formed by the photoelectric switch sensor groups, the positions of the limit grooves can be read, so that the types and the quantity of the absorbing objects can be obtained. Different radiation sources are different for the nuclear spectral shape, and the present simulation system needs to have the ability to respond to different radiation sources. In addition to different types of radioactive sources and different nuclear energy spectrum shapes, the nuclear energy spectrum shapes corresponding to different voltages are also different, and the simulation system stores data corresponding to different radioactive sources and different working voltages in a simulation data source memory. The type of the radioactive source is obtained through infrared data communication, the working high voltage is obtained through a working high voltage measuring circuit, data corresponding to random data sampling can be determined, and energy spectrum simulation is realized through the random data sampling.
The nuclear probe simulator replaces a NaI (Tl) probe in a real experiment system, is a core of the simulation experiment system, and has the main function of simulating the NaI (Tl) probe to output a nuclear-simulated voltage pulse signal. The core probe simulator functions include: (1) Generating a random nuclear-imitating voltage pulse signal which accords with the required energy spectrum distribution according to the type of the radioactive source; (2) the effect on the energy spectrum in response to changes in operating high pressure; (3) Responding to the influence of the type and thickness of the absorbing material on the energy spectrum; (4) responsive to a change in the state of the radiation source simulator switch.
The nuclear probe simulator is used for simulating a real nuclear probe and consists of a nuclear probe controller, a working high-voltage measuring circuit, a simulation data source memory, a nuclear probe simulator encoder and a filtering forming circuit, wherein the working high-voltage measuring circuit, the simulation data source memory, the nuclear probe simulator encoder and the filtering forming circuit are respectively connected with the nuclear probe controller. The working high-voltage measuring circuit consists of a voltage dividing circuit and an ADC chip which are sequentially connected, wherein the ADC chip is a 16-bit ADC chip. The nuclear probe controller obtains working high-voltage information through a working high-voltage measuring circuit, reads simulation data in the simulation data source memory by combining radiation source type information, calculates an absorption threshold value according to the type and the number of absorption sheets, generates a uniformly distributed pseudo-random number, determines whether rectangular voltage pulses are generated through comparison of the pseudo-random number and the absorption threshold value, generates rectangular voltage pulses based on the simulation data if the rectangular voltage pulses are generated, sends the rectangular voltage pulses to a filter forming circuit, and outputs a nuclear-imitating voltage pulse signal. The core probe controller is respectively connected with the working high-voltage measuring circuit, the simulation data source memory, the core probe simulator encoder and the filter forming circuit. The nuclear probe controller obtains working high-voltage information through a working high-voltage measuring circuit; the radioactive source information and the type and number of absorbing objects are obtained through an RX channel of the external USART 1. According to the information, a known distributed discrete random data source is determined, a pot method is adopted for random data sampling, the corresponding experiment of the invention is a nuclear physical experiment, one characteristic of the nuclear physical experiment is that a nuclear probe outputs nuclear voltage pulse signals with randomness, and in order to simulate the characteristic of a real experiment system, the simulation system adopts a random number sampling method, and the shape of a nuclear energy spectrum is obtained by counting random number sampling results. A DAC peripheral of the nuclear probe controller is used for generating rectangular voltage pulses with the amplitude proportional to the random sampling result, and the rectangular voltage pulses generate simulated nuclear voltage pulses through a filter forming circuit. The simulated nuclear voltage pulse accords with the random distribution characteristic of the output pulse signal of the nuclear probe, and can simulate the output signal of the nuclear probe.
(1) The nuclear-imitating voltage pulse generating function is realized. The method for realizing the nuclear-imitating voltage pulse generation function comprises the following steps:
(1) raw data acquisition: using a real gamma energy spectrum measurement experiment system, starting from 550V at high working pressure, sequentially adjusting with 10V as step length until reaching 850V, and measuring background spectra at different high working pressures, 137 Cs and 60 energy spectrum of Co.
(2) Generating a can-method random number sampling data source: using
The formula calculates the probability of each trace of the energy spectrum (accurate to 4-bit decimal), where N i For a corresponding spectrum (including background spectrum), 137 Cs or 60 Co energy spectrum), N all To correspond to the total count of the energy spectrum, P i The probability of the ith channel of the corresponding energy spectrum. The probability of the ith channel is P i The number of the i-th track is (int) (P i *10000 The random sample data of the ith track in the data packet is (int) (P i *10000 I) and storing the data packets in an ascending order in a continuous memory area with 0 as an initial address in the emulation data source memory.
(3) The nuclear probe controller measures the working high voltage through a working high voltage measuring circuit, and obtains the number from the intelligent objective table through the USART1 external deviceThe simulation system needs to measure the working high voltage from the pulse amplitude analyzer since the working high voltage affects the energy spectrum shape, the working high voltage reaches the voltage dividing circuit to be reduced to the ADS1110 input range, the core probe controller obtains the working high voltage by reading the converted data of the ADS1110, and then obtains the simulation data according to the working high voltage and the radiation source type. Firstly, analyzing data from the intelligent object stage to determine the type of the radioactive source 137 Cs、 60 Co or no source) and then corresponding data sources are determined based on the operating high pressure and source type, and the corresponding data is read from the simulated data source memory (i.e., a can-based random number sampling data source). Specific: a pseudo-random number m is generated using the formula addr= [ m x 10000]+1 computing the emulated data storage address, wherein []Refers to a rounding operation. And reading the simulation data through the address, and extracting the obtained random data to accord with the random distribution characteristics of the corresponding energy spectrum.
(4) And (3) carrying out random number online sampling according to the simulation data by using a pot sampling method, wherein the obtained random numbers statistically conform to the amplitude distribution of the corresponding energy spectrum. The random number is fed to the DAC peripheral of the controller, generating rectangular voltage pulses whose amplitude is proportional to the value of the random number.
(5) And sending the rectangular voltage pulse into a filter forming circuit, and outputting a nuclear-imitating voltage pulse signal. The shape of the simulated nuclear voltage pulse is similar to that of an output signal of a NaI (Tl) probe, and the amplitude statistically accords with the corresponding energy spectrum distribution.
(2) The substance absorption function is realized. In addition to the generation of the simulated nuclear voltage pulse, another important task of the gamma-ray absorption virtual simulation experiment system is to automatically respond to the influence of the type and thickness of the absorption substance on the energy spectrum, and the function is a key for realizing the gamma-ray absorption experiment.
The simulation experiment system uses two absorption sheets of aluminum and lead, and can calculate the absorption threshold value AP=e through a formula -μ·AT•AM_N Wherein μ is the linear absorption coefficient of the substance, μ Aluminum (Al) ＝0.194cm -1 Or mu Lead ＝1.213cm -1 The method comprises the steps of carrying out a first treatment on the surface of the AT is suctionThickness of the material, AT Aluminum (Al) =0.92 cm or AT Lead When the material is in an actual experiment, only one type of absorption sheet is used, the type and the number of the absorption sheets are known through the intelligent objective table, and after the type is determined, the linear absorption coefficient mu of the corresponding material and the thickness AT of the absorption sheets are determined; am_n is the number of absorbent sheets.
The nuclear probe simulator controller firstly generates a pseudo-random number A conforming to the required energy spectrum distribution by a pot sampling method 1 Then a (0, 1) uniformly distributed pseudo random number A is generated 2 When A is 2 When AP is not more than, A is 1 Sending the voltage pulse into DAC peripheral equipment to generate rectangular voltage pulse, namely generating nuclear-imitating voltage pulse, when A 2 When the voltage is larger than AP, rectangular voltage pulse is not generated, namely the nuclear-imitating voltage pulse is not generated. The method for determining whether to generate the simulated nuclear power voltage pulse or not through comparing the numerical value with the absorption threshold value can achieve the effect of material absorption statistics.
The pulse amplitude analyzer is connected with a terminal (PC) through an RS-232 interface to form an energy spectrum measuring system, and the energy spectrum measuring system is used for analyzing the nuclear voltage pulse amplitude output by the nuclear probe in a real experiment system to obtain an energy spectrum of a corresponding radioactive source; the terminal is used for displaying the energy spectrum of the radioactive source and carrying out subsequent processing on the energy spectrum.
The working process of the simulation experiment system comprises the following steps: the radioactive source simulator generates an infrared communication signal carrying radioactive source type information, the intelligent object stage receives the infrared communication signal and analyzes the radioactive source type information, simultaneously automatically identifies the type and thickness of the absorbing material, and finally transmits the information to the nuclear probe simulator through serial communication. The nuclear probe simulator generates corresponding nuclear voltage simulation pulse signals according to the information such as the type of the radioactive source, the working high pressure, the type of the absorbing substance, the thickness and the like. The pulse amplitude analyzer analyzes the amplitude of the simulated nuclear voltage pulse signals to obtain energy spectrum data, and finally, the upper computer software displays the energy spectrum and carries out subsequent processing on the energy spectrum.
And performing experimental function verification by using a gamma ray absorption virtual simulation experimental system. Firstly, the influence of the conditions such as collimation optical characteristics of the radioactive source simulator, a radioactive source switch, working high-voltage change and the like on the energy spectrum is sequentially verified, and the response of the simulation experiment system achieves the expected effect. Then verifying the gamma-ray absorption experiment function, sequentially changing the number of aluminum sheets, and measuring the corresponding absorption energy spectrum. And (5) processing the absorption energy spectrum to obtain the net area of the photoelectric peak. The experimental results are shown in fig. 5 (a) and 5 (b), and the absorption experimental effect is the same as the real experimental effect, which proves that the gamma-ray absorption virtual simulation experimental system realizes the gamma-ray absorption experimental function.
The virtual simulation experiment system has the advantages that: the appearance system is the same as that of a real experiment system; the system has the same function as a real experiment system; the student can be given the same experimental experience as a real experimental system.
Example two
The embodiment provides a ray absorption virtual simulation experiment method;
a radiation absorption virtual simulation experiment method comprises the following steps:
the radioactive source simulator simulates a real radioactive source and transmits the type information of the radioactive source to the intelligent objective table;
the intelligent object stage simulates a real object stage, automatically acquires the types and the numbers of the absorption sheets, packages the types and the numbers of the absorption sheets and the type information of the radioactive source, and sends the packaged types and the numbers of the absorption sheets and the type information of the radioactive source to the nuclear probe simulator;
the nuclear probe controller in the nuclear probe simulator obtains working high-voltage information through a working high-voltage measuring circuit, reads simulation data in a simulation data source memory in combination with the radiation source type information, calculates an absorption threshold value according to the type and the number of absorption sheets, generates a uniformly distributed pseudo-random number at the same time, determines whether to generate rectangular voltage pulses through comparison of the pseudo-random number and the absorption threshold value, generates rectangular voltage pulses based on the simulation data if the rectangular voltage pulses are generated, and sends the rectangular voltage pulses to a filter forming circuit to obtain a nuclear-simulated voltage pulse signal.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A radiation absorption virtual simulation experiment system is characterized by comprising: the radioactive source simulator, the intelligent object stage and the nuclear probe simulator are sequentially connected;
the radioactive source simulator is used for simulating a real radioactive source and transmitting radioactive source type information to the intelligent objective table;
the intelligent object stage is used for simulating a real object stage, automatically acquiring the types and the quantity of the absorption sheets, packaging the types and the quantity of the absorption sheets and the type information of the radioactive source, and then sending the packaged types and quantity information to the nuclear probe simulator;
the nuclear probe simulator is used for simulating a real nuclear probe and consists of a nuclear probe controller, a working high-voltage measuring circuit, a simulation data source memory, a nuclear probe simulator encoder and a filtering forming circuit, wherein the working high-voltage measuring circuit, the simulation data source memory, the nuclear probe simulator encoder and the filtering forming circuit are respectively connected with the nuclear probe controller; the nuclear probe controller acquires working high-voltage information through the working high-voltage measuring circuit, reads simulation data in the simulation data source memory by combining the radiation source type information, calculates an absorption threshold value according to the type and the number of the absorption sheets, generates a uniformly distributed pseudo-random number, determines whether rectangular voltage pulses are generated or not through comparison of the pseudo-random number and the absorption threshold value, generates rectangular voltage pulses based on the simulation data if the rectangular voltage pulses are generated, and sends the rectangular voltage pulses to the filter forming circuit to obtain a nuclear-simulated voltage pulse signal;
the intelligent object stage is composed of an object stage controller and an absorption sheet detection device connected with the object stage controller; the absorption sheet detection equipment comprises an objective table and a gravity measurement sensor arranged under the objective table, an absorption object is placed on the objective table, the weight of the object is obtained through the gravity measurement sensor and is transmitted to an objective table controller, the objective table controller stores weight meters, different weights correspond to a specific number of different absorption sheets, and then the type and the number of the absorption object are obtained; or the absorption sheet detection equipment comprises a clamp holder and a displacement measurement sensor connected with the clamp holder, an absorption object is placed in the clamp holder, the total thickness of the object in the clamp holder is obtained through the displacement sensor connected with the clamp holder and is transmitted to a stage controller, the stage controller stores a thickness table, different thicknesses correspond to a specific number of different absorption sheets, and then the type and the number of the absorption object are obtained; or, the absorption sheet detection equipment is formed by a plurality of absorption sheet limit grooves and photoelectric switch sensors in a crossed mode, and the absorption sheet limit grooves are designed into different shapes according to the shapes of the absorption sheets to be measured.
2. The radiation absorption virtual simulation experiment system according to claim 1, wherein the radiation source simulator comprises a radiation source controller, and a radiation source information encoder, a radiation source simulator encoder and an infrared communication transmitting circuit which are respectively connected with the radiation source controller.
3. The radiation absorbing virtual simulation experiment system of claim 1, wherein the intelligent stage further comprises: the intelligent object stage encoder is connected with the object stage controller and the infrared communication receiving chip.
4. The radiation absorbing virtual simulation experiment system as set forth in claim 1, wherein the filter forming circuit is further connected with an energy spectrometer;
the filter forming circuit sends the simulated nuclear voltage pulse signal to the energy spectrometer;
the energy spectrometer is used for carrying out amplitude analysis on the simulated nuclear voltage pulse signal to obtain the energy spectrum of the radioactive source.
5. The radiation absorbing virtual simulation experiment system as set forth in claim 4, wherein said spectrometer is further connected to a terminal;
the terminal is used for displaying the energy spectrum of the radioactive source.
6. The radiation absorption virtual simulation experiment system according to claim 1, wherein the working high-voltage measurement circuit comprises a voltage division circuit and an ADC chip which are connected in sequence.
7. The ray absorption virtual simulation experiment method is characterized by comprising the following steps of:
the radioactive source simulator simulates a real radioactive source and transmits the type information of the radioactive source to the intelligent objective table;
the intelligent object stage simulates a real object stage, automatically acquires the types and the numbers of the absorption sheets, packages the types and the numbers of the absorption sheets and the type information of the radioactive source, and sends the packaged types and the numbers of the absorption sheets and the type information of the radioactive source to the nuclear probe simulator;
a nuclear probe controller in a nuclear probe simulator obtains working high-voltage information through a working high-voltage measuring circuit, reads simulation data in a simulation data source memory in combination with the radiation source type information, calculates an absorption threshold value according to the type and the number of absorption sheets, generates a uniformly distributed pseudo-random number at the same time, determines whether to generate rectangular voltage pulses through comparison of the pseudo-random number and the absorption threshold value, generates rectangular voltage pulses based on the simulation data if the rectangular voltage pulses are generated, and sends the rectangular voltage pulses to a filter forming circuit to obtain a nuclear-simulated voltage pulse signal;
the intelligent object stage is composed of an object stage controller and an absorption sheet detection device connected with the object stage controller; the absorption sheet detection equipment comprises an objective table and a gravity measurement sensor arranged under the objective table, an absorption object is placed on the objective table, the weight of the object is obtained through the gravity measurement sensor and is transmitted to an objective table controller, the objective table controller stores weight meters, different weights correspond to a specific number of different absorption sheets, and then the type and the number of the absorption object are obtained; or the absorption sheet detection equipment comprises a clamp holder and a displacement measurement sensor connected with the clamp holder, an absorption object is placed in the clamp holder, the total thickness of the object in the clamp holder is obtained through the displacement sensor connected with the clamp holder and is transmitted to a stage controller, the stage controller stores a thickness table, different thicknesses correspond to a specific number of different absorption sheets, and then the type and the number of the absorption object are obtained; or, the absorption sheet detection equipment is formed by a plurality of absorption sheet limit grooves and photoelectric switch sensors in a crossed mode, and the absorption sheet limit grooves are designed into different shapes according to the shapes of the absorption sheets to be measured.
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