CN203705367U - Multichannel impulse amplitude analyzer of channel type security inspection machine - Google Patents

Abstract

The utility model discloses a multichannel impulse amplitude analyzer of a of channel type security inspection machine. An LM 318 operational amplification chip is used for amplifying a signal, an OUT port of the LM 318 operational amplification chip inputs the signal to a VINA port of an AD9220ARS chip which converts an analog signal into a digital signal and sends the digital signal to a FPGA (field programmable gate array) chip, and the FPGA chip collects the digital signal to an FIFO in the FPGA chip and is communicated with a STM32F207 processor; and the STM32F207 processor sends an impulse signal to the FPGA chip at regular time, and the FPGA chip receives the impulse signal and transmits all data collected in the schedule time to the STM32F207 processor through a parallel bus. According to the multichannel impulse amplitude analyzer, a high-speed 12-bit AD sampling chip AD9220ARS and an advanced ARMCotex-M3 core processor are adopted, so that the actual inspection speed of the security inspection machine is greatly increased, and rapid inspection is realized.

Description

Channel-type screening machine multichannel pulse scope-analyzer

Technical field

The utility model relates to liquid safety check instrument field, specifically a kind of channel-type screening machine multichannel pulse scope-analyzer.

Background technology

Channel-type screening machine is a kind of rays safety detection apparatus of novel high-tech content, it increases state-of-the-art LS liquid detecting function on the basis of traditional DR function, LS liquid detecting function is to develop based on compton backscattering principle, multiple tracks arteries and veins amplitude analyzer is its core component, and its performance has directly determined the measuring accuracy of screening machine.

Refer to Fig. 1, the theory diagram of existing multichannel pulse scope-analyzer.The principle of multichannel pulse scope-analyzer is to utilize A/D conversion that measured pulse height scope is divided into 2 ⁿindividual amplitude interval, thus analog pulse signal is changed into the digital quantity corresponding with its amplitude, be referred to as " location, road ".In storage space, open up a data field, in this data field, have 2 ⁿindividual counter, location, the corresponding Yi Ge road of each counter.Controller is often received location, Yi Ge road, and counter corresponding to location, controller Bian Jianggai road adds 1, through accumulation after a while, has obtained the distributed data of input pulse amplitude, i.e. spectral line data.The number at the amplitude interval of mentioning is here exactly the road number of multichannel pulse scope-analyzer, and it is determined by n value.

According to the principle of above-mentioned multichannel pulse scope-analyzer, can show that the specific works that multichannel pulse scope-analyzer will do is that the simulating signal of forward path output is carried out to analog to digital conversion on the one hand, and its transformation result is processed, stored and shows.Pulse signal is when by discriminator circuit and control circuit, and discriminator circuit provides the peak information of crossing of pulse, and starts A/D conversion.A/D change-over circuit pulse signals peak amplitude carries out analog to digital conversion, and transformation result is stored on sheet in Flash, carries out corresponding data processing by microcontroller.Multichannel pulse scope-analyzer is made up of discriminator circuit, control circuit, sampling hold circuit, analog to digital conversion circuit, ARM embedded system.Its control core is ARM embedded system, and its basic function is exactly the amplitude differential count by input pulse.The pulse height scope that multichannel pulse scope-analyzer can be analyzed is divided into multiple amplitudes interval, and the number at amplitude interval is exactly the road number of pulse height analyzer, and it is wide that the width at amplitude interval is exactly pulse height analyzer road.Road number is more, and it is meticulousr that amplitude distribution is analyzed, and the corresponding minimizing of counting in each road needs the time of measuring to lengthen, and hardware circuit, along with complexity, therefore, should blindly not pursued number yet.Conventionally, requiring should have 5-10 road within the scope of the half width at amplitude peak, and for the multi-channel energy spectrometer that adopts NaI detector, because its energy resolution is poor, 128 Dao Zhi 256 roads just can meet measures requirement.For semiconductor detector, need 1024-8196 road.

In addition, can can find out on spectrogram (Fig. 2) from different liquids is scattered, the crest location of energy (sample voltage value) is basically identical, but other materials that are not scattered may be introduced the voltage sample value that energy is very high (energy spectrogram right side), and background and other article also may be introduced the voltage sample value that energy is low simultaneously.By sampling channel being set to maximal value (passage co-domain) and the minimum value (territory under passage) of the sampled voltage of AD sample circuit, but the effectively material of other we the insensitive again impact analysis precision of elimination except liquid, through a large amount of research and practices, can realize so best fluid separation applications degree, be also industry leading liquid detecting technology at present.When sampling, the magnitude of voltage under an AD sample circuit sampling channel co-domain and passage between territory, and the number only carrying out in region carries out integration and voltage is not weighted to integration, LS host computer reads the i.e. integrated value for this reason of end product that detecting plate sends up.The key of LS host computer is territory and passage co-domain under passage, for example, by the cumulative number of magnitude of voltage in (100ms) in a period of time being dropped under passage between territory and passage co-domain, can effectively distinguish different liquid.

Utility model content

The purpose of this utility model is to provide a kind of channel-type screening machine multichannel pulse scope-analyzer of energy fast detecting.

For achieving the above object, the utility model provides following technical scheme:

A kind of channel-type screening machine multichannel pulse scope-analyzer, comprises the signal processing circuit, A/D convertor circuit, FPGA Acquisition Circuit and the ARM transmission circuit that connect successively, described signal processing circuit adopts LM318 operation amplifier chip, described A/D convertor circuit adopts AD9220ARS chip to carry out mould/number conversion, described FPGA Acquisition Circuit adopts fpga chip, described ARM transmission circuit adopts STM32F207 processor as ARM type selecting, through LM318 operation amplifier chip, signal is amplified, be input to the VINA port of AD9220ARS chip by the OUT port of LM318 operation amplifier chip, AD9220ARS chip is converted into digital signal simulating signal, and send into fpga chip, described fpga chip by digital signal acquiring in the FIFO of fpga chip inside, and with STM32F207 processor communicates, STM32F207 processor timing to fpga chip transmitted signal, fpga chip receives pulse signal, and send all data that collect in the stipulated time to STM32F207 processor by parallel bus.

As further program of the utility model: described STM32F207 processor is provided with one, a STM32F207 processor connects two fpga chips, a fpga chip connects four AD9220ARS chips, and each AD9220ARS chip connects a Nal detector by a LM318 operation amplifier chip.

As further program of the utility model: described STM32F207 processor receives data, and add and be transmitted to Data Identification head host computer by upper machine communication circuit and process.

As further program of the utility model: described upper machine communication circuit adopts New type of S P3232 communication chip.

Compared with prior art, the beneficial effects of the utility model are: the utility model adopts 12 high-speed AD sampling A/D chip AD9220ARS chips and advanced ARM Cotex-M3 core processor, thereby greatly improve the actual detection speed of liquid safety check instrument, realize fast detecting.

Accompanying drawing explanation

Fig. 1 is the theory diagram of existing multichannel pulse scope-analyzer;

Fig. 2 is the energy spectrogram after different liquids is scattered;

Fig. 3 is the circuit diagram of signal processing circuit in channel-type screening machine multichannel pulse scope-analyzer;

Fig. 4 is the circuit diagram of A/D convertor circuit in channel-type screening machine multichannel pulse scope-analyzer;

Fig. 5 is the circuit diagram of FPGA Acquisition Circuit in channel-type screening machine multichannel pulse scope-analyzer;

Fig. 6 is the circuit diagram of ARM transmission circuit in channel-type screening machine multichannel pulse scope-analyzer;

Fig. 7 is the circuit diagram of upper machine communication circuit in channel-type screening machine multichannel pulse scope-analyzer;

Fig. 8 is the connecting circuit figure of channel-type screening machine multichannel pulse scope-analyzer chips.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.

A kind of channel-type screening machine multichannel pulse scope-analyzer, comprises the signal processing circuit, A/D convertor circuit, FPGA Acquisition Circuit, ARM transmission circuit and the upper machine communication circuit that connect successively.ARM transmission circuit transfers data to host computer by upper machine communication circuit, and host computer is to data analysis and report to the police and process, and is incorporated into and waits work in DR.

Refer to Fig. 3, described signal processing circuit adopts LM318 operation amplifier chip, for the receiving front-end signal of sending of popping one's head in, and signal is filtered make an uproar, the work such as amplification; The signal that probe is brought is given A/D convertor circuit and is carried out mould/number conversion after signal is processed.

Refer to Fig. 4, described A/D convertor circuit adopts AD9220ARS chip to carry out mould/number conversion.AD9220ARS is 12 high-speed module converters of a function admirable of ADI company, and switching rate can be up to 10MSPS, has single-ended and difference analogue input mode, and sampling hold circuit is contained in inside, can select internal reference source and external reference source.

Refer to Fig. 5, data acquisition after the A/D convertor circuit conversion of described FPGA Acquisition Circuit Jiang Si road is in inner FIFO, and communicate with ARM transmission circuit, require that according to the command word of ARM transmission circuit the data in FIFO are sent to ARM transmission circuit by parallel bus and process.Native system adopts the High Performance FPGA of altera corp to design, and has effectively ensured performance and the stability of system.This system maximum can support two fpga chips to work simultaneously, and every fpga chip is supported the probe input of 4 passages.

Concrete grammar is: by fpga chip internal structure register group, operation related algorithm completes the statistics (energy spectrum analysis) of peak value of pulse, determines lower threshold value in pulse, packs (frame by frame) to the pulse number in upper lower threshold value and to data.By the flexible set-up register group of customer requirement size, can arrange several groups or more go up lower threshold value to multichannel pulse scope-analyzer.In order to guarantee the accuracy of card threshold, must reduce the intermediate link of original signal transmission as far as possible, and adopt the amplifier that high-precision linear degree is good.Finally, ARM transmission circuit will read the result of every fpga chip by system beat.

Refer to Fig. 6, described ARM transmission circuit adopts the STM32F207 processor of ST company of STMicw Electronics as ARM type selecting.STM32F207 processor is the ARM Cortex-M3 kernel that requires the Embedded Application of high-performance, low cost, low-power consumption and design based on aiming at.STM32F207 processor selected in system can reach the processing power of 150DMIPS when with 120MHz high-speed cruising, and has up to flash memory on the sheet of 1M byte and the embedded SRAM up to 128K byte.In practical application, the customer parameter that can demarcate when dispatching from the factory is saved in the ROM that ARM carries, and has avoided like this domestic consumer to revise in use the possibility that parameter causes system disorders.

In native system, comprise a STM32F207 processor, the control of STM32F207 processor is also managed all fpga chips, and the reading out data from fpga chip of timing.Data after reading, can send to host computer to process by the form of serial ports.

Concrete grammar is: the time interval (for example 100ms) arranging according to user, STM32F207 processor timing to fpga chip transmitted signal, fpga chip is receiving after pulse signal, to send all data that collect in 100ms to STM32F207 processor by parallel bus, STM32F207 processor receives after data, add Data Identification head (for example channel number and time), be directly transmitted to host computer and process.

Refer to Fig. 7, described upper machine communication circuit adopts New type of S P3232 communication chip, reduces system power dissipation, increases stable signal transmission.Described SP3232 communication chip provides bridge with communicating by letter of host computer for STM32F207 processor.

Workflow of the present utility model is: the CBS signal that You Si road Nal detector detects amplifies signal through LM318 operation amplifier chip respectively, be input to the VINA port of AD9220ARS chip by the OUT port of LM318 operation amplifier chip, AD9220ARS chip is converted into digital signal simulating signal, and send into fpga chip, data acquisition after the AD9220ARS chip conversion of described fpga chip Jiang Si road is in the FIFO of fpga chip inside, and with STM32F207 processor communicates, STM32F207 processor timing to fpga chip transmitted signal, fpga chip receives pulse signal, and send all data that collect in the stipulated time to STM32F207 processor by parallel bus, STM32F207 processor receives data, and add Data Identification head, being transmitted to host computer by SP3232 communication chip processes.

As shown in Figure 8: this new patent is 8 passage MCA, and system mainly comprises 8 road discharge circuits, 8 road A/D convertor circuits, two PGFA chip disposal systems, each PGFA system is processed 4 road AD transforming numericals, and the result of two PGFA processing transfers to host computer by ARM.Specific works workflow: the simulating signal of detector collection is amplified and inputed to 12 AD conversion chip AD9220ARS after processing and carry out mould/number conversion and become 12 position digital signals by amplifier LM318, send into FPGA and carry out digital processing, the result that fpga chip selects EPM1207T144C5N. FPGA to process is given ARM(STM32F207VC), ARM plays intermediate axle beam effect, the result that two FPGA are processed is integrated, by RS232 (SP3232EEY) communication modes and upper machine communication.

To those skilled in the art, obviously the utility model is not limited to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present utility model or essential characteristic, can realize the utility model with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than above-mentioned explanation, is therefore intended to all changes that drop in the implication and the scope that are equal to important document of claim to include in the utility model.Any Reference numeral in claim should be considered as limiting related claim.

In addition, be to be understood that, although this instructions is described according to embodiment, but be not that each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should make instructions as a whole, and the technical scheme in each embodiment also can, through appropriately combined, form other embodiments that it will be appreciated by those skilled in the art that.

Claims (4)

1. a channel-type screening machine multichannel pulse scope-analyzer, is characterized in that, comprises the signal processing circuit, A/D convertor circuit, FPGA Acquisition Circuit and the ARM transmission circuit that connect successively, described signal processing circuit adopts LM318 operation amplifier chip, described A/D convertor circuit adopts AD9220ARS chip to carry out mould/number conversion, described FPGA Acquisition Circuit adopts fpga chip, described ARM transmission circuit adopts STM32F207 processor as ARM type selecting, through LM318 operation amplifier chip, signal is amplified, be input to the VINA port of AD9220ARS chip by the OUT port of LM318 operation amplifier chip, AD9220ARS chip is converted into digital signal simulating signal, and send into fpga chip, described fpga chip by digital signal acquiring in the FIFO of fpga chip inside, and with STM32F207 processor communicates, STM32F207 processor timing to fpga chip transmitted signal, fpga chip receives pulse signal, and send all data that collect in the stipulated time to STM32F207 processor by parallel bus.

2. channel-type screening machine multichannel pulse scope-analyzer according to claim 1, it is characterized in that, described STM32F207 processor is provided with one, a STM32F207 processor connects two fpga chips, a fpga chip connects four AD9220ARS chips, and each AD9220ARS chip connects a Nal detector by a LM318 operation amplifier chip.

3. channel-type screening machine multichannel pulse scope-analyzer according to claim 1 and 2, is characterized in that, described STM32F207 processor receives data, and adds and be transmitted to Data Identification head host computer by upper machine communication circuit and process.

4. channel-type screening machine multichannel pulse scope-analyzer according to claim 3, is characterized in that, described upper machine communication circuit adopts New type of S P3232 communication chip.