CN101419288A - Digital intelligent nuclear detecting and counting device based on bluetooth wireless networks - Google Patents

Abstract

The invention discloses a digitalized intelligent nuclear detection counting device based on Bluetooth wireless communication network, which mainly comprises a central processor unit, a signal input processing unit, a liquid crystal display and keyboard interface unit, a USB interface unit, a Bluetooth communication unit, a calendar time unit, an acousto-optic warning unit and a power distribution supplying and managing unit. The central processor unit is realized by adopting a singlechip and is used as a control core of the whole device. The singlechip is connected with other units through input and output ports of the singlechip, and manages and controls information of other units. The nuclear detection counting device has high timing and counting precision as well as high reliability, realizes friendly user interactive function, realizes multi-point synchronous wireless network deploying measurement, has compact structure and lightness, is convenient to carry, and is suitable for moving measurement.

Description

Digital intelligent nuclear detection and counting device based on bluetooth wireless network

technical field

The invention relates to a nuclear detection and counting device, in particular to a digital intelligent nuclear detection and counting device based on a bluetooth wireless network.

Background technique

The nuclear detection and counting device is the basic measurement device in nuclear measurement, which is mainly used to determine the pulse counting frequency related to some basic physical quantities (such as source strength, conversion probability, reaction cross section, etc.). It cooperates with α, β, γ and other probes to measure radioactivity and dose. A nuclear detection and counting device generally includes a high-voltage power supply module, a low-voltage power supply module, a linear amplifier module, a single-channel pulse amplitude analysis module, and a calibration module. The high and low voltage power supply modules supply the power required by the nuclear radiation detector and other modules, the linear amplifier module amplifies the output signal of the nuclear radiation detector, and the pulse amplitude analysis module implements pulse amplitude analysis on the amplified signal and outputs the pulse amplitude The shaping signal of the input signal between the upper and lower discrimination threshold voltages is counted by the calibration module, and the difference between the upper and lower discrimination threshold voltages is the channel width voltage. The threshold voltage can be measured, the pulse amplitude distribution spectrum of the input signal can be measured, and the single-channel pulse amplitude analysis function can be completed. If the amplified signal is directly input into the calibration module, the total pulse count can be measured to realize the calibration count function. Traditional nuclear detection and counting devices are generally built with discrete components or small-scale integrated circuits. During measurement, the upper and lower discrimination threshold voltages need to be manually adjusted by potentiometers to change their magnitudes, which affects the consistency of the channel width and the positioning accuracy of each channel, and the operation is troublesome. , The nuclear detection and counting device cannot realize unmanned monitoring, repeated measurement and data storage when counting, which is inconvenient to use, large in size and high in cost.

On the other hand, since the nuclear radiation environment generally has a certain impact on human health, especially for occasions with strong radiation, it is more necessary to improve the original system so that on-site testers can stay as far away from the test environment as possible. At the same time, due to the limited area that can be measured by the probe of the nuclear detection and counting device, if one wants to measure and monitor nuclear radiation within a certain range at the same time, then the nuclear detection and counting device is required to realize simultaneous multi-point simultaneous measurement. However, there is no relevant literature or product to propose a solution to this problem.

Contents of the invention

In order to solve the defects of low counting and timing accuracy of traditional nuclear detection and counting devices, poor system interoperability, and inability to realize real-time measurement far away from the test environment and simultaneous multi-point simultaneous measurement, the present invention provides a digital intelligent nuclear detection based on Bluetooth wireless network The counting device adopts an advanced high-performance single-chip microcomputer as the central processing unit, and realizes a high-precision timing counting function combined with a hardware gating circuit; a highly integrated Bluetooth communication unit is used to realize Bluetooth wireless communication, which solves the remote real-time measurement and monitoring of nuclear detection and counting devices. The problem of synchronous measurement of multiple points at the same time; the sound and light alarm unit is composed of buzzer and LED indicator light to realize the automatic sound and light alarm function; with LCD, keyboard and USB interface to realize a friendly human-computer interaction interface; use programmable gain amplifier The adaptive gain amplification of the input signal is realized.

In order to achieve the above-mentioned purpose, the technical scheme adopted in the present invention is as follows: a digital intelligent nuclear detection and counting device based on Bluetooth wireless network, mainly comprising: central processing unit, signal input processing unit, liquid crystal display and keyboard interface unit, USB interface unit, bluetooth communication unit, calendar time unit, sound and light alarm unit and power supply and distribution management unit.

The central processing unit is implemented by a single-chip microcomputer. As the control core of the whole device, the single-chip microcomputer is connected with other units through its input and output ports, and manages and controls the information of other units.

The signal input processing unit is composed of a programmable gain amplifier, a discrimination circuit, a pulse shaping circuit, an anti-coincidence circuit, a threshold adjustment circuit and a gating circuit. The programmable gain amplifier performs adaptive amplification on the input signal from the probe, and after amplification, The analog signal will be sampled by the A/D acquisition port of the single-chip microcomputer. The single-chip microcomputer adaptively adjusts the magnification of the programmable amplifier according to the sampling value. The magnification can also be set manually. Finally, the programmable gain amplifier amplifies the input signal to an appropriate level. The discrimination circuit is composed of an industrial-grade comparator chip. After the amplified signal passes through the discrimination circuit, a TTL level high and low level signal can be obtained, and the TTL level signal obtained by the discrimination circuit is shaped into a pulse signal that can be counted by a single-chip microcomputer through a pulse shaping circuit. The anti-coincidence circuit matches the signals obtained by the upper and lower discrimination circuits. If the signal amplitude is between the upper and lower discrimination threshold voltages, the formed pulse signal is sent to the counter port of the single-chip microcomputer through the gate control circuit for counting, and the verification is completed. In addition, through the threshold adjustment circuit, the threshold comparison voltage of the discrimination circuit can be precisely adjusted by the single-chip microcomputer. The difference between the upper and lower discrimination threshold voltages is the channel width voltage, which is determined by continuously changing the upper and lower discrimination threshold voltages at intervals of the channel width voltage. Measurement, the pulse amplitude distribution spectrum of the input signal can be measured, and the pulse amplitude analysis function can be completed.

The liquid crystal display and keyboard interface unit realizes the information interaction between the nuclear detection and counting device and the user. The liquid crystal display is connected to the address/data bus of the single-chip microcomputer, and the keyboard is connected to the I/O port of the single-chip microcomputer. It is controlled by the single-chip microcomputer program, and the measurement conditions and measurement results are displayed in the form of user menus. Users can select various levels of menus through keyboard input and set measurement conditions. And control the start and stop of the measurement process.

The USB interface unit is connected to the address/data bus of the microcontroller, and the USB chip is enabled through the chip select signal. The USB interface unit can work in both master and slave modes. When it works in the master mode, it acts as the host of the U disk storage device, and can store the measurement results in the format of the file system in the U disk mobile storage device; when it works in the slave mode, it acts as the host of the U disk storage device. The slave device of the PC can realize the real-time data communication with the PC, including the monitoring of the measurement results and the setting of the measurement conditions.

The Bluetooth communication unit realizes long-distance wireless monitoring of measurement results and measurement conditions. At the same time, it can realize networking with other nuclear detection and counting devices and send the results to the monitoring terminal, which solves the problems of remote real-time measurement and multi-point simultaneous measurement. In order to improve the reliability of the system, the present invention adopts a highly integrated bluetooth communication module to realize bluetooth wireless data transmission, and the module is connected with a single-chip microcomputer through a standard serial interface.

The calendar time unit provides calendar time functionality for the entire system, provides time and date stamps for measurements, and features a rechargeable button cell battery to keep the clock running continuously.

The sound and light alarm unit is composed of a buzzer and an LED indicator light. It is controlled by the I/O port of the single-chip microcomputer to realize automatic sound and light alarm. The alarm frequency is set, and different frequencies are automatically issued as the counting frequency exceeds the alarm frequency. Unique alarm sound and alarm indication, intuitive perception of counting pulse frequency.

The power supply and distribution management unit supplies power to each unit of the system. The system power supply is divided into low-voltage power supply and high-voltage power supply. The low-voltage power supply includes the 3.3V power supply for the microcontroller and its peripheral chips, the 5V power supply for the liquid crystal display module, and the ± 12V power supply and 12V low-voltage working power supply for the probe. The high-voltage power supply mainly provides working power for the photomultiplier tube of the probe. For different probes, the high-voltage range is different. Since the output signal of the photomultiplier tube is easily affected by the fluctuation of the applied voltage, the voltage of the high-voltage module must have good stability. In order to ensure the stability of high voltage and realize 0-1500V adjustable, the present invention adopts imported high-voltage power supply module with positive voltage output to cooperate with photomultiplier tube. Its outstanding features are : High stability, high voltage output without overshoot, small ripple and drift coefficient, resistance/voltage adjustment, compact structure. The high-voltage module includes a 12V power input terminal, a 0-1500V high-voltage output terminal, a 0-5V high-voltage adjustment terminal and a ground wire. The 0-5V high-voltage adjustment terminal is controlled by a single-chip microcomputer to realize a 0-1500V high-voltage output. The output response time is 200ms, the ripple is 30mVp-p, and the temperature coefficient is ±0.03/℃, which can meet the high-voltage requirements of the photomultiplier tube of the probe. In order to meet the requirements of portable design and mobile measurement, the present invention adopts 4 lithium batteries in series to supply power for the system, and strictly manages the power supply of the whole device through a single-chip microcomputer. When it is in the non-measurement mode, it will shut off the power supply of the non-working unit Save power consumption.

The invention has the advantages of simple circuit, compact structure, convenient carrying and mobile measurement, the ability to obtain measurement results and set measurement conditions in real time at a distance, stable performance, high intelligence and measurement accuracy, and good human-computer interaction. Compared with the prior art, the present invention also has the following advantages:

1. Make full use of the single-chip microcomputer control technology to realize the high intelligence of the system. Based on the programmable gain amplifier and the measurement of the signal amplitude, the amplification factor of the input signal can be adaptively adjusted, and the output signals of different probes can be automatically processed; the automatic sound and light alarm can be realized. , set the alarm frequency, as the counting frequency exceeds the alarm frequency, it will automatically send out different frequency alarm sounds and alarm indications, and intuitively perceive the counting pulse frequency; the threshold and high voltage output are controlled by the single-chip microcomputer to realize automatic and precise adjustment, and the USB interface chip realizes Automatic identification and switching of master-slave mode;

2. The AVR microprocessor with high performance and low power consumption is used as the central processing unit, which can realize the pulse counting and amplitude analysis of α and β rays at the same time, and is added between the output terminal of the input signal processing unit and the counter of the single-chip microcomputer. The non-gate, the start and stop of the counting and the switch of the NAND gate are synchronously controlled by the single-chip microcomputer, and the timer adopts the interrupt mode, which improves the timing and counting accuracy;

3. The imported high-integrated Bluetooth wireless communication module is used to improve the reliability of the system, and the remote measurement and parameter setting functions can be realized on the intelligent terminal (such as a smart phone or PDA) equipped with Bluetooth devices, without the need to design additional hardware circuits. Save hardware cost, easy to use;

4. Equipped with liquid crystal display and keyboard interface, the interface is displayed in the form of hierarchical menu, and the keyboard input is processed based on the interruption method, the content is displayed clearly, the operation is convenient, the user operation responds quickly, and the friendly user interaction function is realized;

5. Based on the portable design, built-in four lithium batteries, the single-chip microcomputer manages the power supply and distribution unit, realizes the charging management of the lithium battery, and closes the unit modules that are not working to prolong the battery life. The device is compact, light and convenient. Portable, suitable for mobile measurement.

Description of drawings

Fig. 1 is the principle block diagram of nuclear detection and counting device of the present invention;

Fig. 2 is the circuit principle diagram of central processor unit of the present invention;

Fig. 3 is a schematic circuit diagram of the signal input processing unit of the present invention.

Detailed ways

The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 1 is the functional block diagram of the digitized intelligent nuclear detection and counting device based on bluetooth wireless network of the present invention, and described nuclear detection and counting device mainly is made of following several parts: central processing unit 1, signal input processing unit 2, liquid crystal display and Keyboard interface unit 3, USB interface unit 4, Bluetooth communication unit 5, calendar time unit 6, sound and light alarm unit 7 and power supply and distribution management unit 8, each part of the circuit is connected with the central processing unit 1, and the central processing unit 1 for management and control, the front end of the nuclear detection count is the probe 9.

The signal input processing unit 2 mainly includes a programmable gain amplifier 201, a discrimination circuit 202, a pulse shaping circuit 203, an anti-coincidence circuit 204, a gate control circuit 205, and a threshold adjustment circuit 206. The input signal is adaptively amplified to a suitable amplitude, and then the signal amplitude is screened by the screening circuit 202, and the central processing unit 1 controls the screening threshold voltage of the screening circuit 202 through the threshold adjustment circuit 206, and outputs a TTL-level signal from the screening circuit 202. The pulse signal is shaped into a pulse signal with a fixed pulse width by the pulse shaping circuit 203, and is output to the anti-coincidence circuit to realize the coincidence of the two pulse signals obtained by the upper and lower threshold discrimination. If the signal amplitude is between the upper and lower discrimination threshold voltages, Then the pulse signal after shaping is first passed through the gate control circuit 205, and then sent to the counter port of the central processing unit 1 for counting, and the calibration and counting function is completed. Counting accuracy of processor unit 1. The pulse shaping circuit 203 is implemented by a monostable circuit, and the pulse signal output by the discrimination circuit 202 is shaped into a pulse signal with a fixed pulse width by adjusting the resistance-capacitance time constant of the monostable circuit. The threshold adjustment circuit 206 can accurately adjust the threshold comparison voltage of the discrimination circuit 202 by the central processing unit 1. The difference between the upper and lower discrimination threshold voltages is the channel width voltage. By continuously changing the upper and lower discrimination thresholds at intervals of the channel width voltage Voltage measurement, the pulse amplitude distribution spectrum of the input signal can be measured, and the pulse amplitude analysis function can be completed.

FIG. 2 is a schematic circuit diagram of the central processing unit 1 of the present invention. The central processing unit U1 adopts the ATMEGA128 single-chip microcomputer, which is a low-power 8-bit CMOS microprocessor based on the AVR enhanced RISC structure. Its characteristics are: 128K bytes of in-system programmable Flash, 4K bytes of EEPROM and 4K bytes of internal SRAM, 53 programmable I/O lines, two programmable serial USARTs, and one SPI Serial interface, 8-way 10-bit ADC, programmable watchdog timer with independent on-chip oscillator, and six power-saving modes that can be controlled by software.

The connection of central processing unit 1 and signal input processing unit 2 is as shown in Figure 2, and is connected with the data line of programmable gain amplifier 201 by D0, D1, D2 and D3 (PB0, PB1, PB2 and PB3) four data lines , according to the instructions of the central processing unit 1, the amplification gain of the programmable gain amplifier 201 is set, and the output of the programmable gain amplifier 201 is collected by the analog-to-digital conversion port AD0_beta (PF0), so that it can be realized dynamically through the collection result. The amplification factor of the programmable gain amplifier 201 is adjusted to the most suitable value to realize adaptive gain amplification; the output of the threshold adjustment circuit 206 is controlled by PD4_DATA, PD5_CLK, PB4_LDAC and PB5_LOAD (PD4, PD5, PB4 and PB5); through PE6_T1, PE7_T1_GATE , PD6_T0 and PD7_T0_GATE (PE6, PE7, PD6 and PD7) are connected to the gate control circuit 205, PE6_T1 and PD6_T0 are two 16-bit counter ports of the central processing unit 1, and the pulse of the signal input processing unit 2 can be controlled by PE7_T1_GATE and PD7_T0_GATE Whether the output can enter the counter port of the central processing unit 1, realize the gate control of the hardware, and improve the counting precision.

The connection between the central processing unit 1 and the liquid crystal display and the keyboard interface unit 3 is shown in Figure 2, through the address/data bus (PA port), address latch (74HC573), read and write signals RD and WR (PG1 and PG0) , Address latch signal ALE (PG2) and chip select signal (obtained by decoding the address bus through 73HC138) to control the character display of the liquid crystal display, the liquid crystal display adopts a 128×64 dot matrix liquid crystal screen, and the liquid crystal display control chip is KSO108, Display the parameter design and measurement interface in the form of menu; connect with the keyboard through the PC port, use a 4×4 matrix keyboard, and decode the input of the PC port through the central processing unit 1 to obtain 16 different key values to realize the input of parameters and measurement control, etc. The interaction between the device of the present invention and the user can be well realized through the liquid crystal display and keyboard interface unit 3 .

The connection between CPU unit 1 and USB interface unit 4 is shown in Figure 2, through address/data bus (PA port), address latch (74HC573), read and write signals RD and WR (PG1 and PG0), address lock Store signal ALE (PG2), chip select signal (decoded by 73HC138 from the address bus), interrupt signal PE4_INTO (PE4) and master-slave identification signal USB_STATUS (PF2) to control the read and write operations of the USB interface. The USB interface chip uses CH375V Realization, using two different USB interfaces, the high and low levels of the master-slave identification signal USB_STATUS can determine whether the current USB interface is in the master mode or the slave mode. It manages the access of various devices, which saves CPU resources and improves the response speed to USB access devices. It has a certain degree of intelligence and can automatically judge the master and slave of the device.

When a device is connected to the USB interface, the master-slave detection signal is used to identify the master-slave of the device first. When the master device is detected, the master device driver will be called, and the measurement results will be stored in the U disk storage device. Automatic exit; when the slave device is detected, the slave device driver will be called, and in response to the command of the host, send the required data to the host or reply the flag of whether the parameter setting is successful or not, and will automatically exit after receiving the exit command.

The connection between the central processing unit 1 and the Bluetooth communication unit 5 is shown in Figure 2. The Bluetooth wireless data transmission module adopts the imported highly integrated Bluetooth module CSR-BC4-EXT-C2-PA, which is based on the CSR-BC04 Bluetooth chip technology. The module Integrated digital 2.4GHz wireless transceiver, built-in 2.4GHz antenna, users do not need to debug the antenna, integrated 8M Flash, with standard UART and USB interface, based on 3.3V low voltage compatible with the voltage of the central processing unit 1, can Directly connected to the central processing unit 1, small size (27mm×13mm×2mm), half-hole pin technology, can be directly attached to the user's target circuit board. The central processing unit 1 is connected with the Bluetooth communication unit 5 through the serial interfaces PE0_BT_TX0 and PE1_BT_RX0 (PE0 and PE1), and PF3_BT_REST (PF3) is the reset control terminal of the Bluetooth communication unit 5 . Through the Bluetooth SPI programmer, information such as the Bluetooth device name, Bluetooth pairing password, and serial port baud rate can be programmed into the Bluetooth wireless data transmission module in the form of firmware. For the central processing unit 1, bluetooth transmission is transparent, and the bluetooth communication unit 5 mainly realizes long-distance operation and real-time monitoring of measurement results. The intelligent terminal with the bluetooth interface performs long-distance wireless operation on the device and obtains measurement results in real time. When the Bluetooth device searches for the core detection and counting device and successfully paired it, the Bluetooth transmission serial port will be interrupted. At this time, the core detection and counting device will hand over the control right, save the process parameters first, prohibit keyboard input, and let the smart terminal check the core through Bluetooth The detection and counting device operates, and the nuclear detection and counting device first checks the data after receiving the data. If the verification passes, it will respond to the command word. If it receives an exit command, or if the data verification fails, it will transfer to Restore process parameters, allow keyboard input to control the nuclear detection and counting device again by keyboard operation, if it is not an exit command, send the required data to the intelligent terminal through the serial port Bluetooth module or reply the flag of successful parameter setting.

The connection between the central processing unit 1 and the calendar time unit 6 is shown in Figure 2. It is connected with the calendar time unit 6 through the IIC bus PD0_SCL and PD1_SDA (PD0 and PD1), and the calendar time unit can be conveniently set by calling the IIC bus driver. 6 for reading and writing operations, the clock chip is realized by PCF8563, and the chip is always connected with a 32768Hz crystal oscillator and a rechargeable button battery to ensure that the calendar time unit 6 can still work normally when the system has no power supply at all.

The connection of central processing unit 1 and sound and light alarm unit 7 is as shown in Figure 2, is connected on the sound alarm buzzer by the I/O port PD2_ALARM (PD2) of central processing unit 1, by the I/O port PD2_ALARM (PD2) of central processing unit 1 The /O port PD1_LED (PD1) is connected to the light alarm display LED. After setting the alarm upper limit frequency, in the real-time measurement process, as the counting frequency exceeds the alarm upper limit frequency, it will automatically send out different frequency alarm sounds and alarm indications. , intuitive perception of counting pulse frequency.

The connection between the central processing unit 1 and the power supply and distribution management unit 8 is shown in Figure 2, and the power supply output that does not work is closed through the power management port PE5_PW (PE5), so as to save power and prolong the power supply time of the battery; through PD4_DATA, PD5_CLK, PB4_LDAC and PB5_LOAD (PD4, PD5, PB4, PB5) control the voltage output of D/A, thereby controlling the output of the high-voltage module; collect the battery voltage through the analog-to-digital conversion port AD1_POWER (PF1 pin), manage the charging process of the battery and display it on the LCD screen Indicates the current remaining power on the display, and prompts the user to charge when the power is lower than 10%. The single-chip microcomputer management of power saving and battery charging is realized, and the design reflects very good humanization.

Fig. 3 is a schematic circuit diagram of the signal input processing unit of the present invention. The signal input processing unit 2 mainly includes a programmable gain amplifier 201 (that is, U2, the model is LTC6915), a discrimination circuit 202 (that is, U3, U4, U5, the model is LM211), a pulse shaping circuit 203 (that is, U9, U11, the model is 74121 ), anti-coincidence circuit 204 (i.e. U10 and U12A, models are 7474 and 74LSOO), gating circuit 205 (i.e. U12B, U12C, U12D, models are 74LSOO) and threshold adjustment circuit 206 (i.e. U7 and U6, models are TLC5620 and OP747). The signal from the probe 9 is connected to the signal input processing unit 2 through a 50Ω cable, such as the IN access point in Figure 3, the present invention can simultaneously perform pulse counting and amplitude analysis on α and β rays, because the energy of α rays is relatively Large, its output voltage amplitude is 4-10v, can be directly connected to the discrimination circuit U3, U4, U5 to discriminate the pulse output of alpha ray; while the output amplitude of beta ray is only 200-300mv, in order to improve the resolution of discrimination circuit 202 , the amplitude of the β-ray needs to be amplified, and the amplitude output of the β-ray of different probes is different. In order to obtain a more suitable amplitude of the β-ray, the present invention uses a programmable gain amplifier 201, such as U2 in Figure 3, through the central The control of D0, D1, D2 and D3 (PB0, PB1, PB2 and PB3) by processor unit 1 can realize different gains in 14 levels from 0 to 4096 times. For details, please refer to the data sheet of LTC6915. The central processing unit 1 (i.e. U1, model ATMEGA128) can automatically adjust the gain amplification factor by performing D/A sampling on the output of the programmable gain amplifier U2; 1. Control the digital-to-analog conversion chip TLC5620 as shown in Fig. 3 as the output of U7 to realize the automatic adjustment of the discrimination threshold. Since the photomultiplier tube adopts positive high voltage, the output signal of probe 9 is negative, and the output of U7 is carried out through OP747 (U6). Negative amplification, so that the output voltage is between 0 and -10V; since the signal input is an irregular signal, the signal output after screening is an irregular pulse signal. In order to further improve the counting accuracy of the central processing unit 1, the 74121 (i.e. U9, U11) constitute the pulse shaping circuit 203, by adjusting the values of C1, R1 and C2, R2, the pulse width of the shaped alpha and beta rays can be adjusted; the effective pulse output of the beta rays is that the signal is between the upper and lower thresholds , using 7474 (U10) and 74LSOO (U12A) to form an anti-coincidence circuit 204 to match the screening results of the upper and lower thresholds to obtain a pulse signal output; in order to accurately realize the synchronization of counting and time, 74LSOO (U12B, U12C, U12D) is used as The gate control circuit 205 controls the pulse output of α and β by PE7_T1_GATE and PD7_T0_GATE signals of the central processing unit, and finally the pulses of α and β are connected to the counter of the central processing unit 1 through PE6_T1 and PD6_T0 for pulse counting.

The CPU unit 1 starts executing the main program after turning on the power. After the main program starts, first wake up the CPU and initialize the system, including interrupt initialization, powering on the device and reading in the setting parameters from the EEPROM of the central processing unit 1, and then call the LCD driver to display the main interface menu in Chinese characters. At the same time, check whether there is a connected U disk device on the USB interface, and if so, store the measurement results and measurement conditions in the EEPROM into the U disk, check whether there is a Bluetooth paired device, and if so, respond to the instruction of the Bluetooth paired device and execute The corresponding operation is to detect whether there is a host computer connection on the USB interface, and if so, respond to the host computer command and perform the corresponding operation, otherwise, move the current focus to the submenus at all levels through the received keyboard input key value, the submenu There are mainly parameter setting interface, measurement interface and probe initialization interface. After entering the probe initialization interface, receive the modification of the probe initialization parameters by the keyboard, including the setting of the high voltage output of the probe. You can manually adjust the amplification factor of the programmable gain amplifier 201. If you do not adjust the setting, the gain amplification factor will be automatically adjusted by the single-chip microcomputer, and then set the high voltage output , if you choose to save the set parameters, the gain magnification and high voltage parameters will be stored in the EEPROM of the microcontroller, otherwise the parameter setting process will be abandoned; after entering the parameter setting interface, you can set the parameters of the nuclear detection and counting device. The set parameters include the setting of the screening threshold voltage, the upper limit frequency of the alarm, the setting of the measurement condition and the setting of the time and date. The threshold setting includes the α threshold, the β low threshold and the β high threshold. The measurement conditions include the number of tests, measurement time, and counting times. When confirming the input is selected, these setting parameters will be stored in EEPROM, otherwise no processing will be done; after entering the measurement interface, first read each setting parameter, and load the measurement conditions, and load the parameters into each control module through the control port Go, the system supports two measurement modes, which are timing pulse counting measurement and fixed pulse number counting measurement. When the user starts the measurement, the LCD driver is called to display the remaining time of measurement and the number of pulses measured in real time. When the pulse counting frequency is greater than When the upper limit frequency is alarmed, an audible and visual alarm will be issued to detect whether the USB interface is connected to the host computer. If there is, the measurement result will be sent to the host computer. Otherwise, it will not be sent to detect whether there is a Bluetooth pairing device. The network sends to the paired device, otherwise it does not send, if the measurement time is up, the measurement result is stored in EEPROM, otherwise continue to call the LCD driver. The LCD screen will refresh and display the current counting results in real time, and will automatically stop the measurement and save the measurement results when it is judged that the measurement is over; otherwise, re-measure and refresh the display until the measurement is over. All will choose whether to exit after the operation of the above three interfaces is completed, if you choose No, you will re-enter the main interface, and start to receive the input operation of the keyboard. If you choose to exit, the central processing unit 1 will close the power supply of each unit module and Enter sleep mode and wait for the next wake-up CPU.

Claims (4)

1, based on the digital intelligent nuclear detection counting assembly of blue tooth radio network, it is characterized in that: mainly comprise central processor unit, signal input processing unit, liquid crystal display and unit keyboard interface, usb interface unit, bluetooth-communication unit, calendar time unit, acousto-optic warning unit and supply the distribution management unit; Central processor unit adopts chip microcontroller, control core as whole device, single-chip microcomputer is connected the signal processing of control signal input processing unit, and the pulse output signals of acquired signal input processing unit by its input/output port with the signal input processing unit;

Central processor unit is connected with liquid crystal display and unit keyboard interface, realizes the information interaction between nuclear detection counting assembly and the user;

Central processor unit is connected with usb interface unit, discerns master/slave mode of operation automatically, realizes depositing measurement result in USB flash disk equipment or communicating with host computer;

Central processor unit is connected with bluetooth-communication unit, realizes the remote-wireless monitoring of measurement result and measuring condition, realizes simultaneously carrying out networking with other nuclear detection counting assembly and the result being sent on the monitor terminal;

Central processor unit is connected with the calendar time unit, realizes the calendar time function of total system, for measurement result provides the time and date sign;

CPU (central processing unit) is connected with acousto-optic warning unit, realizes the automatic sound-light alarm function that real-time measurement count pulse is out-of-limit;

Central processor unit is connected with supplying the distribution management unit, realizes the Charge Management to lithium battery, cuts off the power supply of dead zone unit module simultaneously, improves the battery flying power.

2, digital intelligent nuclear detection counting assembly based on blue tooth radio network according to claim 1, it is characterized in that: described signal input processing unit is by programmable gain amplifier, discriminator circuit, pulse former, anticoincidence circuit, threshold adjustment circuit and gating circuit are formed, described programmable gain amplifier carries out self-adaptation to the input signal from probe and amplifies, amplified analog signal will be gathered port and be sampled by the A/D of single-chip microcomputer, the enlargement factor that single-chip microcomputer is regulated programmable amplifier according to the sampled value self-adaptation, final programmable gain amplifier is amplified to suitable amplitude with input signal; Signal process discriminator circuit after the amplification obtains the high-low level signal of Transistor-Transistor Logic level, adjusts the threshold value comparative voltage that circuit is accurately regulated discriminator circuit by the single-chip microcomputer passing threshold; The Transistor-Transistor Logic level signal shaping that pulse former obtains discriminator circuit is the pulse signal that single-chip microcomputer can be counted; Anticoincidence circuit meets the signal that discriminator circuit obtains, if signal amplitude is between the discrimination threshold voltage, then forms pulse output signals; Signal output after the anticoincidence is connected to an input end of gating circuit, another input end of gating circuit is by Single-chip Controlling, if single-chip microcomputer allows gating circuit output, then the counter port that the pulse signal after the anticoincidence is delivered to single-chip microcomputer by gating circuit is counted, finish and appraise and decide the mark tally function, otherwise forbid that the pulse signal after the anticoincidence enters the counter port of single-chip microcomputer.

3, the digital intelligent nuclear detection counting assembly based on blue tooth radio network according to claim 2, it is characterized in that: described threshold adjustment circuit is accurately controlled by single-chip microcomputer, realization is to the adjusting of the threshold value comparative voltage of discriminator circuit, the difference of upper and lower discrimination threshold voltage is wide voltage, by serving as to change at interval continuously upper and lower discrimination threshold voltage to measure with the wide voltage in road, record the pulse height distribution profile of input signal, finish the pulse amplitude analysis function.

4, the digital intelligent nuclear detection counting assembly based on blue tooth radio network according to claim 1, it is characterized in that: described central processor unit is carried out following steps after energized:

A, call the liquid crystal display driver, show main interface menu with hanzi form, detect simultaneously whether the USB flash disk of connection equipment is arranged on the USB interface, if have then measurement result among the EEPROM and measuring condition are deposited in the USB flash disk, whether have Bluetooth pairing equipment exist, whether if the instruction that then responds Bluetooth pairing equipment is arranged and carry out corresponding operation, detecting has host computer to connect on the USB interface if detecting, then respond the host computer instruction and carry out corresponding operation if having, otherwise carry out b;

B, the input of reception keyboard then jump to the c execution if select parameter that the interface is set, and as if selecting probe initialization interface then to carry out d, if e is then carried out at selection measurement interface, carry out a otherwise return;

C, display parameter are provided with the interface, receive keyboard to the modification of parameter is set, and comprise discrimination threshold threshold voltage and measuring condition, deposit EEPROM in if select preservation that parameter then will be set after setting completed, and carry out a, forward a to otherwise abandon the parameter storage;

D, demonstration probe initialization interface, receive the modification of keyboard to the probe initiation parameter, comprise the setting of probe high pressure output, if select manually to be provided with the enlargement factor of programmable gain amplifier, the enlargement factor of programmable amplifier then also must be set, deposit EEPROM in if select preservation that parameter then will be set after setting completed, and carry out a, forward a to otherwise abandon the parameter storage;

The interface is measured in e, demonstration, read the initialization that is stored among the EEPROM parameter is set, and be loaded on the corresponding hardware circuit, comprise the setting of the manual enlargement factor of discrimination threshold threshold voltage, measuring condition, the output of probe high pressure and programmable gain amplifier, if programmable amplifier is an auto state, signal after then being amplified by single chip computer measurement carries out self-adaptation and regulates enlargement factor, and the parameter loaded is carried out f;

F, the input of reception keyboard, if selecting to begin to measure then carries out g, selection is withdrawed from and is carried out a, otherwise re-executes f;

G, call the liquid crystal drive program, show the pulse number of measuring excess time and measurement in real time, when the real-time pulse count frequency will send sound and light alarm during greater than the high alarm setting frequency, whether have host computer connect, if having then measurement result is sent to host computer if detecting USB interface, otherwise do not send, whether have Bluetooth pairing equipment exist, if having then measurement result is sent on the paired device by blueteeth network, otherwise do not send if detecting, if Measuring Time is to then carrying out h, otherwise continue execution g;

H, measurement result is deposited among the EEPROM, carry out a.

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