CN203705369U - Multi-channel pulse amplitude analyzer of liquid security detection instrument - Google Patents
Multi-channel pulse amplitude analyzer of liquid security detection instrument Download PDFInfo
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- CN203705369U CN203705369U CN201420095655.7U CN201420095655U CN203705369U CN 203705369 U CN203705369 U CN 203705369U CN 201420095655 U CN201420095655 U CN 201420095655U CN 203705369 U CN203705369 U CN 203705369U
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Abstract
The utility model discloses a multi-channel pulse amplitude analyzer of a liquid security detection instrument. The analyzer comprises an AD (analog to digital) sampling circuit, a signal amplification and transmission circuit and an ARM (advanced RISC machines) embedded system, wherein the AD sampling circuit adopts an AD9220 chip; the signal amplification and transmission circuit comprises an LM318 operational amplification chip and a channel selection chip MAX4518; the ARM embedded system adopts an STM32103FVCT6 processor as an ARM model; signals are amplified and sent to a NO1 port or a NO2 port of the channel selection chip MAX4518 by the LM318 operational amplification chip and output to a VINA port of the AD9220 chip by a COM port of the channel selection chip MAX4518, the AD9220 chip converts analog signals into digital signals and sends the digital signals to PD0 to PD11 ports of the STM32103FVCT6 processor. According to the analyzer, the 12-bit high-speed AD sampling chip AD9220 and an advanced ARMCotex-M3 kernel processor are adopted, so that the actual detection speed of the liquid security detection instrument is increased greatly, and rapid detection is realized.
Description
Technical field
The utility model relates to liquid safety check instrument field, specifically a kind of liquid safety check instrument multichannel pulse scope-analyzer.
Background technology
Liquid safety check instrument is the high-tech based on compton backscattering principle, the safety check instrument of Non-Destructive Testing.Multichannel pulse scope-analyzer is the core component of liquid safety check instrument, and its performance has directly determined the measuring accuracy of liquid safety check instrument; Because safety check industry is to having strict demand on the detection speed of liquid safety check instrument now, therefore, the operating rate that improves multichannel pulse scope-analyzer is the core place of improving liquid safety check instrument detection speed.
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 liquid safety check instrument multichannel pulse scope-analyzer of energy fast detecting.
For achieving the above object, the utility model provides following technical scheme:
A kind of liquid safety check instrument multichannel pulse scope-analyzer, comprises AD sample circuit, signal amplification and transmission circuit and ARM embedded system; Described AD sample circuit adopts AD9220 chip; Described signal amplifies and transmission circuit comprises LM318 operation amplifier chip and channel selecting chip MAX4518; Described ARM embedded system adopts STM32103FVCT6 processor as ARM type selecting; Through LM318 operation amplifier chip, signal is amplified, and send into NO1 port or the NO2 port of channel selecting chip MAX4518, exported to the VINA port of AD9220 chip by the com port of channel selecting chip MAX4518, AD9220 chip is converted into digital signal simulating signal, and sends into the PD0-PD11 mouth of STM32103FVCT6 processor.
As further program of the utility model: adopt MAX3232CSE communication chip as upper machine communication circuit between described ARM embedded system and host computer, by STM32103FVCT6 processor, digital signal is carried out to operational analysis, and the result data of operational analysis the UART1TX port by MAX3232CSE communication chip and UART1RX port transmission in host computer.
Compared with prior art, the beneficial effects of the utility model are: the utility model adopts 12 high-speed AD sampling A/D chip AD9220 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 AD sample circuit in liquid safety check instrument multichannel pulse scope-analyzer;
Fig. 4 is that in liquid safety check instrument multichannel pulse scope-analyzer, signal amplifies and the circuit diagram of transmission circuit;
Fig. 5 is the circuit diagram of ARM embedded system in liquid safety check instrument multichannel pulse scope-analyzer;
Fig. 6 is the circuit diagram of upper machine communication circuit in liquid safety check instrument multichannel pulse scope-analyzer;
Fig. 7 is the connecting circuit figure of liquid safety check instrument 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 liquid safety check instrument multichannel pulse scope-analyzer, comprises AD sample circuit, signal amplification and transmission circuit, ARM embedded system and upper machine communication circuit.
Refer to Fig. 3, described AD sample circuit adopts AD9220 chip, AD9220 chip is 12 high-speed module converters of a function admirable of ADI company, switching rate can be up to 10MSPS, there is single-ended and difference analogue input mode, sampling hold circuit is contained in inside, can select internal reference source and external reference source.
The key property of AD9220 chip has:
(1) sampling rate flexibly: 1.5/3.0/10.0 MSPS sampling rate;
(2) low-power consumption: 59mW, 200mW, 250mW is single-phase+5V power supply;
(3) integral non-linear error: 0.5 LSB(least significant bit (LSB) LSB-least significant bit);
(4) differential nonlinearity error: 0.3 LSB; Input reference noise: 0.09 LSB;
(5) integrality: have sampling and hold amplifier and reference voltage on sheet;
(6) signal and noise and distortion ratio: 70 dB;
(7) Spurious Free Dynamic Range: 80 dB;
(8) straight binary output data
(9) 28 pin SOIC(compact package integrated circuit) and 28 pin SSOP(dwindle outline packages).
Current hardware design, the ADC sampling rate of use is 5Mbps.
Refer to Fig. 4, described signal amplifies and transmission circuit comprises LM318 operation amplifier chip and channel selecting chip MAX4518.Described LM318 operation amplifier chip be a kind of high precision, at a high speed, high gain operational, through specially designed amplifier, for the application program in high pressure Slew Rate and high bandwidth.With many broad band amplifiers, LM318 operation amplifier chip is unity gain stable, because it has internal circuit frequency compensation.But the compensation that external module can be added, to reach optimum performance.While use in anti-phase application, feedforward compensation.LM318 operation amplifier chip comprises A/D converter, quick point, and oscillator, active filter, sampling and holding circuit, universal amplifier, is characterized in:
(1) unity gain stable (internal frequency compensation);
(2) the typical input offset voltage of 4mV;
(3) the typical input offset current of 30nA;
(4) input bias current is 250nA(maximal value);
(5) 15MHz bandwidth (small-signal);
(6) 50V/ μ s slew rate (assurance);
(7) operating voltage be ± 5V is to ± 20V;
(8) input and output overload protection;
(9) identical pin assignment is general-purpose operation amplifier.
Refer to Fig. 5, described ARM embedded system adopts the STM32103FVCT6 processor of ST company of STMicw Electronics as ARM type selecting.STM32103FVCT6 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, and is characterized in:
(1) chip model: STM32103FVCT6;
(2) figure place: 32bit;
(3) I/O number: 80;
(4) program storage size: 256 KB;
(5) memory span, RAM:32KB
(6) processor speed: 72MHz;
(7) oscillator type: outside, inside;
(8) timer number: 8;
(9) peripheral devices: ADC, DAC, DMA, PWM, Timer;
(10) embedded interface type: CAN, I2C, SPI, UART;
(11) PWM port number: 16;
(12) encapsulated type: LQFP
(13) interface: CAN, I2C, SPI, USART, USB;
(14) interface type: 3 x USART, 2 x UART, 3 x SPI, (2 x I2S), 2 x I2C, USB, CAN, SDIO;
(15) analog to digital converter input number: 3.
Refer to Fig. 6, described upper machine communication circuit adopt common MAX3232CSE communication chip as ARM embedded system the bridge that is connected with host computer, MAX3232CSE communication chip finds broad application at communication field with its stable transmission performance.
As Fig. 7, after the simulating signal that NaI detector gathers is amplified by amplifier LM318, select chip MAX4518 to export 12 ultra high speed A/D conversion chip AD9220 to through multiple signals (this novel practical patent can be tested 4 road signals), after converting simulating signal to 12 position digital signals, pass to the processing of ARM chip, the ARM chip that this novel practical patent is chosen is that STM32F103VCT6. communication chip is selected MAX3232CSE, it can both-way communication, facilitates ARM and host computer to realize bidirectional communication function.
Workflow of the present utility model is: the CBS signal being detected by Nal detector amplifies signal through LM318 operation amplifier chip, and send into NO1 port or the NO2 port of channel selecting chip MAX4518, exported to the VINA port of AD9220 chip by the com port of channel selecting chip MAX4518, AD9220 chip is converted into digital signal simulating signal, and send into the PD0-PD11 mouth of STM32103FVCT6 processor, by STM32103FVCT6 processor, digital signal is carried out to operational analysis, and the result data of operational analysis the UART1TX port by MAX3232CSE communication chip and UART1RX port transmission in host computer.
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 (2)
1. a liquid safety check instrument multichannel pulse scope-analyzer, is characterized in that, comprises AD sample circuit, signal amplification and transmission circuit and ARM embedded system, and described AD sample circuit adopts AD9220 chip; Described signal amplifies and transmission circuit comprises LM318 operation amplifier chip and channel selecting chip MAX4518; Described ARM embedded system adopts STM32103FVCT6 processor as ARM type selecting; Through LM318 operation amplifier chip, signal is amplified, and send into NO1 port or the NO2 port of channel selecting chip MAX4518, exported to the VINA port of AD9220 chip by the com port of channel selecting chip MAX4518, AD9220 chip is converted into digital signal simulating signal, and sends into the PD0-PD11 mouth of STM32103FVCT6 processor.
2. liquid safety check instrument multichannel pulse scope-analyzer according to claim 1, it is characterized in that, between described ARM embedded system and host computer, adopt MAX3232CSE communication chip as upper machine communication circuit, by STM32103FVCT6 processor, digital signal is carried out to operational analysis, and the result data of operational analysis the UART1TX port by MAX3232CSE communication chip and UART1RX port transmission in host computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420095655.7U CN203705369U (en) | 2014-03-04 | 2014-03-04 | Multi-channel pulse amplitude analyzer of liquid security detection instrument |
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| CN201420095655.7U CN203705369U (en) | 2014-03-04 | 2014-03-04 | Multi-channel pulse amplitude analyzer of liquid security detection instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375162A (en) * | 2014-10-24 | 2015-02-25 | 苏州德鲁森自动化系统有限公司 | Multi-channel pulse amplitude analyzer for loaded signal conditioning circuit |
| CN104391318A (en) * | 2014-10-24 | 2015-03-04 | 苏州德鲁森自动化系统有限公司 | Pulse amplitude analyzer for realizing differential clock based on iron core inductor |
| CN104502381A (en) * | 2015-01-06 | 2015-04-08 | 安徽中福光电科技有限公司 | 6331 method for solving practicability problem of channel type X ray machine |
-
2014
- 2014-03-04 CN CN201420095655.7U patent/CN203705369U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375162A (en) * | 2014-10-24 | 2015-02-25 | 苏州德鲁森自动化系统有限公司 | Multi-channel pulse amplitude analyzer for loaded signal conditioning circuit |
| CN104391318A (en) * | 2014-10-24 | 2015-03-04 | 苏州德鲁森自动化系统有限公司 | Pulse amplitude analyzer for realizing differential clock based on iron core inductor |
| CN104502381A (en) * | 2015-01-06 | 2015-04-08 | 安徽中福光电科技有限公司 | 6331 method for solving practicability problem of channel type X ray machine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20170304 |