CN112505745A - Automatic music score stabilizing system - Google Patents
Automatic music score stabilizing system Download PDFInfo
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- CN112505745A CN112505745A CN202011375894.4A CN202011375894A CN112505745A CN 112505745 A CN112505745 A CN 112505745A CN 202011375894 A CN202011375894 A CN 202011375894A CN 112505745 A CN112505745 A CN 112505745A
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- 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
- G01T1/362—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with scintillation detectors
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- G—PHYSICS
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
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Abstract
The invention discloses an automatic spectrum stabilizing system.A detection module is used for receiving gamma rays and generating fluorescence; the photomultiplier is used for converting the fluorescence into energy spectrum signal pulses; the multichannel analyzer module is used for processing the energy spectrum signal pulse and generating 1024 channels of full spectrum data; the energy spectrum data recording module is used for carrying out radioactivity spectrum measurement counting statistics on 1024 full-spectrum data in each channel, searching a characteristic peak position within preset time, measuring characteristic peak position drift amount and generating an amplitude adjustment instruction; a spectrum stabilizing module: and the amplitude adjustment device is used for adjusting the amplitude of the energy spectrum signal pulse according to the amplitude adjustment instruction. The automatic spectrum stabilizing system provided by the invention adjusts the amplitude of the signal pulse according to the adjustment instruction for all the received energy spectrum signal pulses, corrects the drift of energy spectrum measurement data, and improves the precision of the measurement result.
Description
Technical Field
The invention relates to the technical field of energy spectrums, in particular to an automatic spectrum stabilizing system.
Background
In the aviation gamma energy spectrum measurement, the acquisition and the receiving of gamma rays mainly adopt a sodium iodide crystal and photomultiplier detector circuit structure, in the measurement work, the working characteristics of the sodium iodide crystal and the photomultiplier are greatly influenced by the change of the environmental temperature, the signal pulse amplitude generated by the gamma rays with certain energy can fluctuate along with the change of the environmental temperature, and in the gamma ray energy spectrum counting measurement, the drift of the record channel number of the gamma rays can be generated, so that the accuracy of the gamma energy spectrum measurement is influenced; therefore, in the radioactive gamma energy spectrum measurement work, the energy spectrum pulse meter has very important significance for eliminating the influence change of the environmental temperature on the signal pulse generated by the gamma ray and stabilizing each measurement record track on the data acquisition precision. In an aviation gamma energy spectrum measuring instrument, the commonly used spectrum stabilizing mode mainly comprises a detector constant temperature mode and an energy spectrum detector passive automatic spectrum stabilizing measuring mode, a passive automatic spectrum stabilizing technology utilizes gamma rays emitted by natural radioactive elements to generate recording of characteristic peak positions of signal pulses of energy spectrum measurement, and the working high voltage of a photomultiplier or the gain of a signal amplifying circuit influencing the pulse amplitude of the energy spectrum signals is adjusted according to the recording deviation of the characteristic peak positions in the measurement, so that the aim of stabilizing the energy spectrum measuring spectral lines is fulfilled; however, the adjustment of the high-voltage spectrum stabilization mode of the photomultiplier and the spectrum stabilization mode for controlling the gain of the signal amplification circuit can cause the change of the linear slope of the energy spectrum measurement, that is, when a certain radioactive element characteristic peak is used for spectrum stabilization operation, the recording of the characteristic peak position measured by other radioactive elements can cause partial offset change.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an automatic spectrum stabilizing system, which increases or decreases a controllable voltage value on a pulse voltage to achieve the increase or decrease of the pulse amplitude and realize the purpose of automatic spectrum stabilization.
An automatic spectrum stabilizing system comprising: a detection module: for receiving gamma rays and generating fluorescence; a photomultiplier tube: for converting the fluorescence into a pulse of energy spectrum signal; a multi-channel analyzer module: the system is used for processing the energy spectrum signal pulse and generating 1024 channels of full spectrum data; the energy spectrum data recording module: the system is used for carrying out radioactivity energy spectrum measurement counting statistics on the 1024 full-spectrum data in each channel, searching a characteristic peak position in a preset time, measuring a characteristic peak position drift amount and generating an amplitude adjustment instruction; a spectrum stabilizing module: and the amplitude adjustment instruction is used for adjusting the amplitude of the energy spectrum signal pulse.
The automatic spectrum stabilizing system provided by the invention adjusts the amplitude of the signal pulse according to the adjustment instruction for all the received energy spectrum signal pulses, corrects the drift of the energy spectrum measurement data, and the automatic spectrum stabilizing adjustment circuit can not generate the relative change of the characteristic peak position record of each energy spectrum when carrying out spectrum stabilizing operation, thereby improving the precision of the measurement result.
Preferably, the energy spectrum data recording module is further configured to generate a high-voltage adjustment instruction; and the spectrum stabilizing module is also used for adjusting the working point voltage of the photomultiplier according to the high-voltage adjusting instruction.
Preferably, the spectrum stabilizing module comprises a main control module, a high-voltage adjusting module and a signal pulse amplitude adjusting module; the main control module: the amplitude adjustment module is used for receiving an amplitude adjustment instruction and sending the amplitude adjustment instruction to the signal pulse amplitude adjustment module; the high-voltage regulating module is also used for receiving a high-voltage regulating instruction and sending the high-voltage regulating instruction to the high-voltage regulating module; the signal pulse amplitude adjusting module: the energy spectrum signal pulse receiving module is used for receiving the energy spectrum signal pulse, carrying out amplitude adjustment on the energy spectrum signal pulse according to an amplitude adjustment instruction, generating an amplitude adjustment pulse and sending the amplitude adjustment pulse to the main control module; a high-voltage adjusting module: the voltage regulator is used for regulating the working point voltage of the photomultiplier according to a high-voltage regulating instruction; the master control module is further configured to send the amplitude adjustment pulse to a multichannel analyzer module.
Preferably, the signal pulse amplitude adjusting module comprises a first amplifying module, a signal comparing module, an amplitude adjusting module and a selection switch module; the input end of the first amplification module is the input end of the energy spectrum signal pulse; the output end of the first amplification module is respectively connected with the input end of the signal comparison module and the input end of the amplitude adjustment module, and the control end of the amplitude adjustment module is connected with the output end of the main control module; the input end of the selection switch module is respectively connected with the output end of the signal comparison module and the output end of the amplitude adjustment module; the output end of the selection switch module is connected with the input end of the main control module;
the amplitude adjusting module comprises a signal amplitude increasing unit, a signal amplitude reducing unit, a first resistor and a second resistor; the input end of the signal amplitude increasing unit is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the output end of the first amplifying module; the second end of the first resistor is also connected with the input end of the signal amplitude reduction unit; the control end of the signal amplitude increasing unit and the control end of the signal amplitude reducing unit are respectively connected with the output end of the main control module, and the output end of the signal amplitude increasing unit and the output end of the signal amplitude reducing unit are respectively connected with the input end of the selection switch module.
Preferably, the signal amplitude increasing unit comprises a first electronic switch, a control end of the first electronic switch is connected with an output end of the main control module, and an input end of the first electronic switch is connected with a first end of the first resistor; the first output end of the first electronic switch is grounded, and the second output end of the first electronic switch is connected with the first input end of the selection switch module.
Preferably, the signal amplitude reducing unit comprises a second electronic switch, a first amplifier, a third resistor and a fourth resistor, wherein a positive phase input end of the first amplifier is connected with a second end of the first resistor, a negative phase input end of the first amplifier is connected with a first end of the third resistor, and an output end of the first amplifier is connected with a second end of the third resistor;
the inverting input end of the first amplifier is also connected with the first end of a fourth resistor, and the second end of the fourth resistor is connected with the input end of a second electronic switch; the control end of the second electronic switch is connected with the output end of the main control module; the first output end of the second electronic switch is grounded, and the second output end of the second electronic switch is connected with the second input end of the selection switch module.
Preferably, the signal comparison module includes a second amplifier, a comparator, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, and a first sliding rheostat, a positive phase input terminal of the second amplifier is connected to an output terminal of the first amplification module, a negative phase input terminal of the second amplifier is connected to a first terminal of the fifth resistor and a first terminal of the sixth resistor, respectively, a second terminal of the fifth resistor is connected to an output terminal of the second amplifier, and a second terminal of the sixth resistor is grounded;
a first end of the seventh resistor, which is connected with the first capacitor in parallel, is connected with the output end of the second amplifier, a second end of the seventh resistor, which is connected with the first capacitor in parallel, is connected with a first end of the eighth resistor, and a second end of the eighth resistor is grounded; the first end of the eighth resistor is also connected with the first input end of the comparator; the first end of the seventh resistor, which is connected with the first capacitor in parallel, is also connected with the first end of the ninth resistor, and the second end of the ninth resistor is connected with the second input end of the comparator; the second end of the ninth resistor is also connected with the first end of the second capacitor and the first fixed end of the first slide rheostat respectively, and the second end of the second capacitor, the second fixed end of the first slide rheostat and the sliding end of the first slide rheostat are grounded; the output end of the comparator is connected with the control end of the selection switch module.
Preferably, the selection switch module includes a third electronic switch, a control end of the third electronic switch is connected with the output end of the signal comparison module, a first input end of the third electronic switch is connected with the output end of the signal amplitude increasing unit, and a second input end of the third electronic switch is connected with the output end of the signal amplitude decreasing unit; the first output end and the third output end of the third electronic switch are grounded; and a second output end and a fourth output end of the third electronic switch are connected with each other and then connected with an input end of the main control module.
Preferably, the high voltage regulation module comprises a high voltage module and a regulation module; the adjusting module comprises an automatic adjusting module, a manual adjusting module and a change-over switch; the input end of the change-over switch is respectively connected with the output end of the automatic adjusting module and the output end of the manual adjusting module; the output end of the change-over switch is connected with the adjusting end of the high-voltage module; the automatic adjustment module comprises a signal input module, a reference voltage module and a second amplification module; the input end of the second amplification module is respectively connected with the output end of the reference voltage module and the output end of the signal input module; the output end of the second amplification module is connected with the input end of the selector switch; the input end of the signal input module is connected with the output end of the main control module; the output end of the high-voltage module is connected with the input end of the photomultiplier.
Preferably, the manual adjustment module comprises a second sliding rheostat, a first fixed end of the second sliding rheostat is connected with the reference end of the high-voltage module, a second fixed end of the second sliding rheostat is grounded, and a sliding end of the second sliding rheostat is connected with the second input end of the selector switch.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a voltage regulator module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a boot program of a main control module singlechip according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a control program of a main control module singlechip according to an embodiment of the invention;
FIG. 5 is a circuit diagram of a signal pulse amplitude adjustment module according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a high voltage regulator module according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of a main control module according to an embodiment of the present invention;
fig. 8 is a circuit diagram of a power module according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
The embodiment of the invention provides an automatic spectrum stabilizing system, which comprises a detection module, as shown in figure 1: for receiving gamma rays and generating fluorescence. A photomultiplier tube: for converting the fluorescence into a pulse of spectral signal. A multi-channel analyzer module: for signal processing the energy spectrum signal pulse and generating 1024 full spectrum data. The energy spectrum data recording module: the method is used for carrying out radioactivity energy spectrum measurement counting statistics on 1024 full-spectrum data in each channel, searching a characteristic peak position in preset time, measuring the characteristic peak position drift amount and generating an amplitude adjustment instruction. A spectrum stabilizing module: and adjusting the amplitude of the energy spectrum signal pulse according to the amplitude adjusting instruction. The spectrum data recording module is also used for generating a high-voltage adjusting instruction, and the spectrum stabilizing module is also used for adjusting the working point voltage of the photomultiplier according to the high-voltage adjusting instruction.
In the measurement of radioactive gamma energy spectrum, a scintillation crystal detector is used for receiving gamma rays, the rays are ionized in the crystal, emitted fluorescence enters a photomultiplier, and charges generated through photoelectric conversion are amplified among stages of the photomultiplier to output energy spectrum signal pulses. The energy spectrum pulse multichannel analyzer circuit analyzes and processes the received energy spectrum signal pulse into 1024 channels of full spectrum data and sends the data to the energy spectrum data recording module. The energy spectrum data recording module receives and records 1024 channels of full spectrum data, simultaneously carries out radioactivity spectrum measurement counting statistics on the received data in each channel, continuously searches energy characteristic peak position counting sent by natural radioactivity elements used for spectrum stabilization, checks the change of the number position of the recording channels of the characteristic peaks, and controls the peak stabilization action of the spectrum stabilization circuit according to the drift condition of the characteristic peak positions. The energy spectrum data recording module receives radioactive full-spectrum data, the gamma ray energy characteristic peak count emitted by the measured natural radioactive elements is accumulated in a large amount through data of a certain time, the characteristic peak energy channel count accords with a normal distribution statistical rule, and the central peak position of the characteristic peak is calculated as follows:
The energy spectrum data recording module calculates an adjustment parameter according to the measured energy spectrum characteristic peak position drift amount and sends an amplitude adjustment instruction to the spectrum stabilization module through a serial port, and after the spectrum stabilization module receives the amplitude adjustment instruction, the spectrum stabilization module operates a spectrum stabilization module circuit according to the meaning of the instruction and executes corresponding adjustment execution actions, including adjustment of high voltage of a working point of the photomultiplier and adjustment of signal amplitude of received energy spectrum signal pulses.
Fig. 2 is a schematic structural diagram of a voltage stabilizing module according to an embodiment of the present invention, where the spectrum stabilizing module includes a main control module, a high voltage adjustment module, and a signal pulse amplitude adjustment module. The main control module: the amplitude adjustment module is used for receiving an amplitude adjustment instruction and sending the amplitude adjustment instruction to the signal pulse amplitude adjustment module; and the high-voltage regulating module is also used for receiving the high-voltage regulating instruction and sending the high-voltage regulating instruction to the high-voltage regulating module. And the signal pulse amplitude adjusting module is used for receiving the energy spectrum signal pulse, adjusting the amplitude of the energy spectrum signal pulse according to the amplitude adjusting instruction, generating an amplitude adjusting pulse and sending the amplitude adjusting pulse to the main control module. A high-voltage adjusting module: and the voltage regulator is used for regulating the working point voltage of the photomultiplier according to the high-voltage regulating instruction. The master control module is further configured to send the amplitude adjustment pulse to the multichannel analyzer module.
The main control module comprises an STM32F407 single chip microcomputer, a schematic diagram of a starting-up program of the main control module single chip microcomputer in the embodiment of the invention is shown in FIG. 3, the energy spectrum data recording module sends a corresponding adjusting instruction through a serial port according to the deviation size and direction of the central peak position of the characteristic peak, and the STM32F407 single chip microcomputer control and operation circuit completes the received serial port command. The stm32f407 single chip microcomputer system software programming comprises an initialization program of the single chip microcomputer system, and mainly comprises system clock initialization, GPIO interface initialization, DMA channel initialization, interrupt initialization, serial port initialization and simulation port initialization, and further comprises full spectrum data receiving, full spectrum data transmission, spectrum stabilizing control command receiving and spectrum stabilizing control command operation execution of the single chip microcomputer system.
Fig. 4 is a schematic diagram of a control program of a main control module single chip microcomputer according to an embodiment of the present invention, where an STM32F407 single chip microcomputer receives 1024 full-spectrum data sent by a multichannel analyzer module through a pin PC11, transmits the data to a serial port transmission buffer through a DMA channel, and sends the received 1024 full-spectrum data to an energy spectrum data recording module through a serial port transmission pin PA9 in real time according to a corresponding data format, and meanwhile, a serial port reception pin PA10 waits for receiving an adjustment instruction sent by the energy spectrum data recording module in real time, where the instruction format is designed as follows: the high-voltage adjustment instruction is as follows: the Vddd plus enter line-feed character is ended, wherein V is an English capital letter, the followed dddd is decimal data to be adjusted with 4 bits, and the corresponding high-voltage adjustment range of 0< dddd <3300 in the designed high-voltage circuit is 700 plus 1400V; the energy spectrum pulse amplitude adjustment instruction is as follows: gdddd plus enter linefeed symbol ends, wherein 'G' is English capital letter, the 'dddd' in the heel is decimal data to be adjusted with 4 bits, 900< dddd <1100, in the design, dddd 1000 is a central peak value, dddd >1000 peak tracks are shifted to high and adjusted, dddd <1000 peak tracks are shifted to low and 900< dddd <1100 is corresponding to energy spectrum characteristic peak position shift from-39 tracks to +39 tracks.
Fig. 5 is a circuit diagram of a signal pulse amplitude adjustment module according to an embodiment of the present invention, where the signal pulse amplitude adjustment module includes a first amplification module, a signal comparison module, an amplitude adjustment module, and a selection switch module. The input end of the first amplification module is the input end of the energy spectrum signal pulse, the output end of the first amplification module is respectively connected with the input end of the signal comparison module and the input end of the amplitude adjustment module, and the control end of the amplitude adjustment module is connected with the output end of the main control module. The input end of the selection switch module is respectively connected with the output end of the signal comparison module and the output end of the amplitude adjustment module, and the output end of the selection switch module is connected with the input end of the main control module. The amplitude adjustment module comprises a signal amplitude increasing unit, a signal amplitude reducing unit, a resistor R17 and a resistor R19, wherein the input end of the signal amplitude increasing unit is connected with the first end of the resistor R17, the second end of the resistor R17 is connected with the first end of the resistor R19, and the second end of the resistor R19 is connected with the output end of the first amplification module. The second end of the resistor R17 is also connected with the input end of the signal amplitude reducing unit, the control end of the signal amplitude increasing unit and the control end of the signal amplitude reducing unit are respectively connected with the output end of the main control module, and the output end of the signal amplitude increasing unit and the output end of the signal amplitude reducing unit are respectively connected with the input end of the selection switch module.
The positive phase input end of the first amplification module receives the energy spectrum signal pulse, and the energy spectrum signal pulse is amplified by the first amplification module and then respectively input to the signal comparison module and the amplitude adjustment module. The signal comparison module outputs a control signal to the selection switch module, and when the control signal is at a low level, the energy spectrum signal is grounded in a pulse mode; when the control signal is at a high level, the selection switch module outputs the signal with the adjusted amplitude to the main control module. In this embodiment, the main control module receives the spectrum stabilizing command through the serial port, and correspondingly increases or decreases the amplitude of the energy spectrum signal pulse through the signal amplitude increasing unit or the signal amplitude decreasing unit.
In this embodiment, the signal amplitude increasing unit includes an electronic switch U3, the electronic switch U3 is a chip of SGM3001 type, an input end of the electronic switch U3 is connected to an output end of the first amplification module through a resistor R17 and a resistor R19 which are connected in series, a control end of the electronic switch U3, that is, a pin 1 is connected to a pin PD0 of the main control chip, when the pin 1 of the electronic switch U3 receives a low level, the pin 5 is connected to a pin 4, and the energy spectrum signal is grounded in a pulse manner; when pin 1 of the electronic switch U3 receives a high level, pin 5 is connected to pin 6, and the energy spectrum signal pulse is output to the first input terminal of the selection switch module.
The signal amplitude reduction unit comprises an electronic switch U10, an amplifier U6, a resistor R24 and a resistor R26, wherein the electronic switch U10 is a chip of an SGM3001 model. The non-inverting input terminal of the amplifier U6 is connected to the output terminal of the first amplification block through a resistor R19, and a resistor R24 is connected in parallel between the inverting input terminal and the output terminal of the amplifier U6. The inverting input end of the amplifier U6 is connected with the input end of the electronic switch U10 through a resistor R26, the control end of the electronic switch U10, namely the pin 1, is connected with the PD1 pin of the main control chip, when the pin 1 of the electronic switch U10 receives low level, the pin 5 is connected with the pin 4, and the energy spectrum signal pulse is grounded; when pin 1 of the electronic switch U10 receives a high level, pin 5 is connected to pin 6, and the energy spectrum signal pulse is output to the second input terminal of the selection switch module.
In this embodiment, the signal comparison module includes an amplifier U2, a comparator U1, a resistor R7, a resistor R12, a resistor R3, a resistor R5, a resistor R10, a capacitor C2, a capacitor C3, and a slide rheostat R6; the non-inverting input end of the amplifier U2 is connected with the output end of the first amplification module, the inverting input end of the amplifier U2 is respectively connected with the first end of the resistor R7 and the first end of the resistor R12, the second end of the resistor R7 is connected with the output end of the amplifier U2, and the second end of the resistor R12 is grounded; a first end of the resistor R3 and the capacitor C2 which are connected in parallel is connected with the output end of the amplifier U2, a second end of the resistor R3 and the capacitor C2 which are connected in parallel is connected with a first end of the resistor R5, and a second end of the resistor R5 is grounded; the first terminal of resistor R5 is also connected to a first input terminal of comparator U1. The first end of the resistor R3 connected with the capacitor C2 in parallel is also connected with the first end of the resistor R10, and the second end of the resistor R10 is connected with the second input end of the comparator U1. The second end of the resistor R10 is further connected to the first end of the capacitor C3 and the first fixed end of the sliding rheostat R6, respectively, the second end of the capacitor C3, the second fixed end of the sliding rheostat R6 and the sliding end of the sliding rheostat R6 are grounded, and the output end of the comparator U1 is connected to the control end of the selection switch module. The comparator selects a comparator chip with the model of MAX913, the signal comparison module generates a square wave signal synchronous with the received energy spectrum signal pulse, and the square wave signal is used as a switch control signal of the selection switch module, so that the amplitude adjustment module can only play a role in adjustment when the signal pulse arrives.
In this embodiment, the selection switch module includes an electronic switch U4, a control terminal of the electronic switch U4, i.e., pin 1, is connected to the output terminal of the signal comparison module, and the electronic switch U4 is a chip of an SGM7222 type. Pin 4 of the electronic switch U4 is connected to the output terminal of the signal amplitude increasing unit, pin 6 of the electronic switch U4 is connected to the output terminal of the signal amplitude decreasing unit, pin 9, pin 2, and pin 8 of the electronic switch U4 are grounded, and pin 3 of the electronic switch U4 is connected to pin PA4 of the main control module after being connected to pin 7. When the pin 1 of the electronic switch U4 receives a low level, the pin 4 of the electronic switch U4 is connected to the pin 2, and the pin 6 is connected to the pin 8, that is, the pin 4 and the pin 6 of the U4 are grounded; when the pin 1 of the electronic switch U4 receives a high level, the pin 4 of the electronic switch U4 is connected to the pin 3, the pin 6 is connected to the pin 7, and the adjusted signal is input to the PA4 pin of the main control module.
The first amplification module comprises an amplifier U7, a resistor R22 and a capacitor C9, a positive phase input end of the amplifier U7 is an input end of energy spectrum signal pulses of the energy spectrum signals, a first end of the resistor R22 and the capacitor C9 which are connected in parallel is connected with an inverting input end of a third amplifier, a second end of the resistor R22 and the capacitor C9 which are connected in parallel is connected with an output end of the amplifier U7, and an output end of the amplifier U7 is connected with an input end of the signal comparison module and an input end of the amplitude adjustment module respectively.
Fig. 6 is a circuit diagram of a high voltage adjustment module according to an embodiment of the present invention, where the high voltage adjustment module includes a high voltage module and an adjustment module, and the adjustment module includes an automatic adjustment module, a manual adjustment module, and a switch. The input end of the change-over switch is respectively connected with the output end of the automatic adjusting module and the output end of the manual adjusting module, and the output end of the change-over switch is connected with the adjusting end of the high-voltage module. The automatic adjustment module comprises a signal input module, a reference voltage module and a second amplification module, wherein the input end of the second amplification module is respectively connected with the output end of the reference voltage module and the output end of the signal input module, the output end of the second amplification module is connected with the input end of the change-over switch, the input end of the signal input module is connected with the output end of the main control module, and the output end of the high-voltage module is connected with the input end of the photomultiplier.
The second amplification module comprises an amplifier U11, a capacitor C11, a resistor R27, a resistor R28, a resistor R29, a resistor R30 and a resistor R31. An inverting input of the amplifier U11 is connected to a first terminal of a resistor R27, and a second terminal of the resistor R27 is connected to an output of the amplifier U11. The inverting input end of the amplifier U11 is also connected with the first end of the resistor R28, and the second end of the resistor R28 is grounded; a non-inverting input end of the amplifier U11 is respectively connected with a first end of the resistor R29 and a first end of the resistor R30, a second end of the resistor R29 is connected with an output end of the signal input module, and a second end of the resistor R30 is connected with an output end of the reference voltage module; the output terminal of the amplifier U11 is also connected to a first terminal of a resistor R31, and a second terminal of the resistor R31 is connected to a first input terminal of the switch. The power supply end of the amplifier U11 is connected with a +5V power supply, and a capacitor C11 is connected between the +5V power supply and the ground in series. The signal input module comprises a pin J2, wherein pin 1 of J2 is connected with the output signal of the master control module, and pin 2 of J2 is connected with the ground.
In this embodiment, the manual adjustment module includes a sliding rheostat R32, a first fixed end of the sliding rheostat R32 is connected to the reference end of the high voltage module, a second fixed end of the sliding rheostat R32 is grounded, and a sliding end of the sliding rheostat R32 is connected to the second input end of the switch.
In this embodiment, the input terminal of the high voltage module U13 is connected to a +12V power supply, the model of the high voltage module U13 is HG-P152-1M66, and the output voltage range of the high voltage module is 650-1400V.
The change-over switch comprises a first input end, a second input end and an output end, and when the first input end and the output end are connected with each other and the second input end and the output end are disconnected, the automatic adjustment mode is adopted in the embodiment; when the second input end and the output end are connected with each other and the first input end is disconnected with the output end, the present embodiment is in a manual adjustment mode, wherein the connection mode of the first input end, the second input end and the output end is a connection cap. Under the condition of an automatic adjusting mode, the input voltage of a signal input module is 0-2.5V, the input voltage is sent into a high-voltage adjusting module through a J2 socket which is the signal input module, the input voltage is superposed with a reference voltage output by MAX6062 to control the voltage input of an adjusting end of the high-voltage module, an amplifying circuit chip in the circuit adopts AD8065, the output adjusting voltage of the AD8065 is 2-4.5V, and the output voltage of the corresponding high-voltage module is 650V-1400V. Under the condition of a manual adjustment mode, the voltage input of the adjustment end of the high-voltage module is controlled by adjusting the slide sheet of the slide rheostat, and the output voltage of the high-voltage module is correspondingly adjusted.
Fig. 7 is a circuit diagram of a main control module according to an embodiment of the present invention, where the main control module includes an STM32F407 type main control chip, and the main control module further includes a serial communication module, where the serial communication module includes a chip with a type of MAX3232, and the main control chip is electrically connected to the serial communication module, the high voltage adjustment module, and the signal pulse amplitude adjustment module, respectively. The stable spectrum control CPU processing circuit is composed of a Cortex M4 kernel stm32F407 single chip microcomputer and peripheral circuits of ST company; the system comprises an energy spectrum multichannel analyzer module, an STM32F407 singlechip, a photomultiplier tube, a spectrum data recording module, an STM32F407 singlechip, a spectrum stabilizing high-voltage adjusting module, an energy spectrum data recording module, a spectrum stabilizing high-voltage adjusting module and an energy spectrum signal pulse receiving module, wherein the STM32F407 singlechip is used for receiving 1024 full-spectrum data sent by the energy spectrum multichannel analyzer module and forwarding the 1024 full-spectrum data to the energy spectrum data recording module through a serial port, receiving a high-voltage adjusting instruction and an amplitude adjusting instruction sent by the energy spectrum data recording module through the serial port, respectively controlling the adjustment control of a high-voltage circuit of the photomultiplier tube and the signal amplitude adjustment control of an energy spectrum signal pulse according to instruction contents, sending the 1024 full-spectrum data to the energy spectrum data recording module through a serial port PA10 by; the single chip microcomputer outputs corresponding analog control voltage through ports PA4 and PA5 according to the size of data adjusted in the instruction, the output analog signal DAC2 adjusts the working high voltage of the photomultiplier, DAC1 adjusts the amplitude increment of the energy spectrum signal pulse, and the single chip microcomputer controls analog switches SGM3001_ A and SGM3001_ B through interfaces PD0 and PD1 respectively to control the increase or decrease of the energy spectrum signal pulse amplitude basic value.
Fig. 8 is a circuit diagram of a power module according to an embodiment of the present invention, where the power module supplies power to the main control module, the high voltage adjustment module, and the signal pulse amplitude adjustment module.
The design method of the spectrum stabilizing circuit adopts intelligent circuit hardware designed in the energy spectrum detector and control and operation software in a circuit CPU chip, on a gamma ray signal pulse receiving circuit, a voltage value is added or subtracted to all received energy spectrum signal pulses according to a spectrum stabilizing control command to change the amplitude of the signal pulse, the magnitude of the voltage value is determined by the control command, the drift of energy spectrum measurement data is corrected, and the automatic spectrum stabilizing adjusting circuit can not generate relative change recorded by characteristic peak positions of each energy spectrum when performing spectrum stabilizing operation.
The automatic spectrum stabilizing system realized by the embodiment changes the amplitude of the signal pulse by increasing or decreasing the voltage on the received energy spectrum signal pulse, thereby realizing the automatic spectrum stabilization of the energy spectrum measurement. Through circuit test data result analysis, the amplitude of the energy spectrum signal pulse is increased or decreased by a fixed numerical value on each received energy spectrum signal pulse with different amplitudes, so that the fitting linear slope index of the received energy spectrum signal data is not changed, relative deviation on the position of the characteristic central peak of each radioactive element energy spectrum is not caused, and the linearity index of the measured data display adjustment data is better. The embodiment can also adjust the high-voltage working point of the photomultiplier through the high-voltage adjusting module, so that the high-voltage work of the photomultiplier is in the flat area of the characteristic curve, and the measurement precision is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. An automatic spectrum stabilizing system is characterized in that: the method comprises the following steps:
a detection module: for receiving gamma rays and generating fluorescence;
a photomultiplier tube: for converting the fluorescence into a pulse of energy spectrum signal;
a multi-channel analyzer module: the system is used for processing the energy spectrum signal pulse and generating 1024 channels of full spectrum data;
the energy spectrum data recording module: the system is used for carrying out radioactivity energy spectrum measurement counting statistics on the 1024 full-spectrum data in each channel, searching a characteristic peak position in a preset time, measuring a characteristic peak position drift amount and generating an amplitude adjustment instruction;
a spectrum stabilizing module: and the amplitude adjustment instruction is used for adjusting the amplitude of the energy spectrum signal pulse.
2. An automatic spectrum stabilizing system according to claim 1, characterized in that: the energy spectrum data recording module is also used for generating a high-voltage adjustment instruction; and the spectrum stabilizing module is also used for adjusting the working point voltage of the photomultiplier according to the high-voltage adjusting instruction.
3. An automatic spectrum stabilizing system according to claim 2, characterized in that: the spectrum stabilizing module comprises a main control module, a high-voltage adjusting module and a signal pulse amplitude adjusting module;
the main control module: the amplitude adjustment module is used for receiving an amplitude adjustment instruction and sending the amplitude adjustment instruction to the signal pulse amplitude adjustment module; the high-voltage regulating module is also used for receiving a high-voltage regulating instruction and sending the high-voltage regulating instruction to the high-voltage regulating module;
the signal pulse amplitude adjusting module: the energy spectrum signal pulse receiving module is used for receiving the energy spectrum signal pulse, carrying out amplitude adjustment on the energy spectrum signal pulse according to an amplitude adjustment instruction, generating an amplitude adjustment pulse and sending the amplitude adjustment pulse to the main control module;
a high-voltage adjusting module: the voltage regulator is used for regulating the working point voltage of the photomultiplier according to a high-voltage regulating instruction;
the master control module is further configured to send the amplitude adjustment pulse to a multichannel analyzer module.
4. An automatic spectrum stabilizing system according to claim 3, characterized in that: the signal pulse amplitude adjusting module comprises a first amplifying module, a signal comparing module, an amplitude adjusting module and a selection switch module; the input end of the first amplification module is the input end of the energy spectrum signal pulse; the output end of the first amplification module is respectively connected with the input end of the signal comparison module and the input end of the amplitude adjustment module, and the control end of the amplitude adjustment module is connected with the output end of the main control module; the input end of the selection switch module is respectively connected with the output end of the signal comparison module and the output end of the amplitude adjustment module; the output end of the selection switch module is connected with the input end of the main control module;
the amplitude adjusting module comprises a signal amplitude increasing unit, a signal amplitude reducing unit, a first resistor and a second resistor; the input end of the signal amplitude increasing unit is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the output end of the first amplifying module; the second end of the first resistor is also connected with the input end of the signal amplitude reduction unit; the control end of the signal amplitude increasing unit and the control end of the signal amplitude reducing unit are respectively connected with the output end of the main control module, and the output end of the signal amplitude increasing unit and the output end of the signal amplitude reducing unit are respectively connected with the input end of the selection switch module.
5. An automatic spectrum stabilizing system according to claim 4, wherein: the signal amplitude increasing unit comprises a first electronic switch, the control end of the first electronic switch is connected with the output end of the main control module, and the input end of the first electronic switch is connected with the first end of the first resistor; the first output end of the first electronic switch is grounded, and the second output end of the first electronic switch is connected with the first input end of the selection switch module.
6. An automatic spectrum stabilizing system according to claim 5, wherein: the signal amplitude reducing unit comprises a second electronic switch, a first amplifier, a third resistor and a fourth resistor, wherein the positive phase input end of the first amplifier is connected with the second end of the first resistor, the negative phase input end of the first amplifier is connected with the first end of the third resistor, and the output end of the first amplifier is connected with the second end of the third resistor;
the inverting input end of the first amplifier is also connected with the first end of a fourth resistor, and the second end of the fourth resistor is connected with the input end of a second electronic switch; the control end of the second electronic switch is connected with the output end of the main control module; the first output end of the second electronic switch is grounded, and the second output end of the second electronic switch is connected with the second input end of the selection switch module.
7. An automatic spectrum stabilizing system according to claim 6, wherein: the signal comparison module comprises a second amplifier, a comparator, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor and a first slide rheostat, wherein a positive phase input end of the second amplifier is connected with an output end of the first amplification module, a negative phase input end of the second amplifier is respectively connected with a first end of the fifth resistor and a first end of the sixth resistor, a second end of the fifth resistor is connected with an output end of the second amplifier, and a second end of the sixth resistor is grounded;
a first end of the seventh resistor, which is connected with the first capacitor in parallel, is connected with the output end of the second amplifier, a second end of the seventh resistor, which is connected with the first capacitor in parallel, is connected with a first end of the eighth resistor, and a second end of the eighth resistor is grounded; the first end of the eighth resistor is also connected with the first input end of the comparator; the first end of the seventh resistor, which is connected with the first capacitor in parallel, is also connected with the first end of the ninth resistor, and the second end of the ninth resistor is connected with the second input end of the comparator; the second end of the ninth resistor is also connected with the first end of the second capacitor and the first fixed end of the first slide rheostat respectively, and the second end of the second capacitor, the second fixed end of the first slide rheostat and the sliding end of the first slide rheostat are grounded; the output end of the comparator is connected with the control end of the selection switch module.
8. An automatic spectrum stabilizing system according to claim 7, wherein: the selection switch module comprises a third electronic switch, the control end of the third electronic switch is connected with the output end of the signal comparison module, the first input end of the third electronic switch is connected with the output end of the signal amplitude increasing unit, and the second input end of the third electronic switch is connected with the output end of the signal amplitude decreasing unit; the first output end and the third output end of the third electronic switch are grounded; and a second output end and a fourth output end of the third electronic switch are connected with each other and then connected with an input end of the main control module.
9. An automatic spectrum stabilizing system according to claim 3, characterized in that: the high-voltage adjusting module comprises a high-voltage module and an adjusting module; the adjusting module comprises an automatic adjusting module, a manual adjusting module and a change-over switch; the input end of the change-over switch is respectively connected with the output end of the automatic adjusting module and the output end of the manual adjusting module; the output end of the change-over switch is connected with the adjusting end of the high-voltage module; the automatic adjustment module comprises a signal input module, a reference voltage module and a second amplification module; the input end of the second amplification module is respectively connected with the output end of the reference voltage module and the output end of the signal input module; the output end of the second amplification module is connected with the input end of the selector switch; the input end of the signal input module is connected with the output end of the main control module; the output end of the high-voltage module is connected with the input end of the photomultiplier.
10. An automatic spectrum stabilizing system according to claim 9, wherein: the manual adjustment module comprises a second slide rheostat, a first fixed end of the second slide rheostat is connected with a reference end of the high-voltage module, a second fixed end of the second slide rheostat is grounded, and a sliding end of the second slide rheostat is connected with a second input end of the change-over switch.
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