CN201181283Y - Portable high-speed multi-channel energy spectrometer - Google Patents
Portable high-speed multi-channel energy spectrometer Download PDFInfo
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- CN201181283Y CN201181283Y CNU2007201848719U CN200720184871U CN201181283Y CN 201181283 Y CN201181283 Y CN 201181283Y CN U2007201848719 U CNU2007201848719 U CN U2007201848719U CN 200720184871 U CN200720184871 U CN 200720184871U CN 201181283 Y CN201181283 Y CN 201181283Y
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Abstract
The utility model relates to a device for detecting elements by using rays, which is characterized in that the device is connected with a pulse shaping unit circuit through a pulse signal input terminal; the output terminal of the pulse shaping unit circuit is connected with a channel dividing unit circuit and a threshold detection unit circuit in parallel; the output terminal of the channel dividing unit circuit and the output terminal of the threshold detection unit circuit are respectively connected with a peak sampling and holding unit circuit; the output terminal of the peak sampling and holding unit circuit is connected with a singlechip; the singlechip is connected with a memory; and a communication unit is connected with the output interface of the singlechip. By adopting high-speed A/D conversion technique, pulse peak voltage detection and holding technique, high-speed linear gate circuit and an entire logic control system, the device can improve the integration nonlinear index to 0.025%, improve the maximal output frequency above 30 kHz, shorten the collection time, and enlarge the application range, and can achieve more convenient operation and easier data output and interaction with other application programs by using a software Chinese interface.
Description
Technical field
The utility model relates to a kind of element pick-up unit, relates to a kind of device that utilizes the ray detection element specifically.
Background technology
The nuclear detection technique is used more and more widely in fields such as industry, military affairs.Along with the development of nuclear detection technique, the spectral measurement technology has become the predominant methods of nuclear detection technique.The nuclear pulse that every kind of material produces under the radiation exposure of certain wavelength has certain rule, and the multiple tracks energy depressive spectroscopy is the energy spectrum analysis to various rays, and the amplitude of the nuclear pulse of various rays excite is quantized, and obtains examining the data of pulse with energy distribution.Analyzing gamma-spectrometric data can learn and contain certain element detection of drugs, explosive (as be used for) and various element in the measured object in the content of measured object (as the constituent analysis of industrial mineral matter, environmental protection tests etc.).
Present existing multi-channel analysis instrument core---quantization level (analog to digital conversion) unit adopts electric discharge to carry out the pulse amplitude quantification, switching time is long, and be aided with a large amount of counter device recording clocks and demarcate discharge time, it is low that these factors cause original multi-channel analysis spectrometer can survey the pulse digit rate, improve that can to survey the pulse digit rate very difficult.Domestic same quasi-instrument, one of its technical indicator " integral nonlinearity " is 0.1% only, the highest incoming frequency is no more than 10kHz according to test, and the external non-Chinese interface of its application software of same quasi-instrument is inconvenient to operate.
Summary of the invention
The utility model is at the defective of existing multi-channel energy spectrometer, proposes a kind of incoming frequency height, portable high-speed multi-channel energy spectrometer that integral nonlinearity is little.
The scheme that solves the problems of the technologies described above is, a kind of portable high-speed multi-channel energy spectrometer, it is characterized in that: this device is to connect the pulse shaping unit circuit by pulse signal input terminal, pulse shaping unit circuit output end even road element circuit in parallel and threshold detection unit circuit, even road element circuit output terminal is connected peak value sampling holding unit circuit respectively with the threshold detection unit circuit output end, peak value sampling holding unit circuit output end connects single-chip microcomputer, single-chip microcomputer connected storage; Communication unit is connected with the single-chip microcomputer output interface, and host computer and communication unit are connected to form; In the pulse shaping unit circuit, adopt operational amplifier IC01 (ad8011) and IC02 (ad8011) to constitute filtering circuit; In even road element circuit, adopt D/A converter to constitute even road circuit; In the threshold detection unit circuit, adopt D/A converter and comparer IC303 and follower to constitute; In peak value sampling holding unit circuit, adopt peak-seeking to keep module and logic module to constitute peak sampling hold circuit; Single-chip microcomputer adopts the C8051f021 chip; Storer is LS62LV1024, and communication unit adopts the RS232 module; Host computer is the industrial computer that is equipped with VC++ written application program software.
The signal of being received by the pulsed signal device passes to pulse shaping unit, shaped pulse signal is sent into even unit, road, the peak-seeking that signal behind the even road is sent into the peak value sampling holding unit keeps module, the while shaped pulse signal enters the peak value sampling holding unit through threshold detection unit logic module, the output signal of peak value sampling holding unit is sent into the A/D converting unit of single-chip microcomputer, the even unit, road of the even road control of single-chip microcomputer I/O pin control, the logic module of the logic control I/O pin control peak value sampling holding unit of single-chip microcomputer, single-chip microcomputer and communication unit intercommunication, communication unit is connected with host computer by cable.
The beneficial effects of the utility model: the utility model is owing to adopt high-speed a/d converter technique, peak impulse voltage to detect and maintenance technology, high speed line style gate circuit and complete machine logic control system on circuit, make its integral nonlinearity index can reach 0.025%, the highest output frequency is greater than 30kHz, shortened acquisition time, but and expanded application scope, the more convenient operation of application software Chinese interface, data output is easier to be mutual with other application program.
Description of drawings
Fig. 1 is the utility model circuit block diagram
Fig. 2 is a pulse shaping circuit block diagram among Fig. 1
Fig. 3 is an even road circuit block diagram among Fig. 1
Fig. 4 is a threshold detection circuit block diagram among Fig. 1
Fig. 5 is a peak sampling hold circuit block diagram among Fig. 1
Embodiment:
Portable quick multi-channel energy spectrometer circuit block diagram specifies its principle and structure below in conjunction with synoptic diagram as shown in Figure 1.
The probe pulse signal output end connects the input end of pulse shaping unit 1 circuit, and the pulse signal that receives is input to pulse shaping unit 1.
Shaping pulse: on the time of occurrence of nuclear pulse is at random, even two pulse close proximity, and amplitude might be superimposed.On the other hand, nuclear pulse self contains high high fdrequency component, and it is carried out that peak value detects and sampling keeps being difficulty.Therefore need be with high fdrequency component and low frequency component filtering.In pulse shaping unit 1 circuit, adopt IC01 (ad8011) and IC02 (ad8011) operational amplifier to constitute filtering circuit, as shown in Figure 2.
Whole peak fractionated gain: G
Zf=V
Out1/ V
In=2.5
V
In---the input nucleus pulse amplitude
V
Out1---whole peak part output signal amplitude
Even road: approach type A/D device integral linearity is good gradually, and differential linearity can not satisfy the requirement (as differential linearity 1%) that nuclear spectrum is analyzed, and is embodied in wide inhomogeneously, and the former pulse that should count a certain road counts adjacent location, road and causes adjacent twice counting inaccurate.Corresponding way is that the data that A/D converts deduct the voltage of stack again, utilize good characteristics of integral linearity and statistical law that differential linearity is improved like this with the different voltage of each nuclear superimposed pulses, even road method that Here it is.Even road voltage is provided by D/A converter, by totalizer (ad845) superposition in the nuclear pulse of shaping.In even unit, road 2 circuit, adopt D/A converter to constitute even road circuit, as shown in Figure 3.
Threshold test: mix in the nuclear pulse lower or higher signal of some amplitudes and the lower undesired signal of some amplitudes.These are provided with upper-level threshold, threshold detection down to analyzing useless or being unfavorable for the necessary filtering of the spurious signal of analyzing in circuit, be lower than the specified signal amplitude and do not analyze with the pulse that is higher than the specified signal amplitude.Threshold test is made up of two comparers, threshold value is exported by the D/A device, amplitude can be also can adjusting in application according to analyzing needs of fixing, threshold detection circuit figure adopts D/A converter and comparer ad790 (IC303) and lf156 follower to constitute in threshold detection unit 3 circuit as shown in Figure 4.
Even unit, road 2 circuit output ends are connected peak value sampling holding unit 4 circuit respectively with threshold detection unit 3 circuit output ends, peak value sampling holding unit 4 circuit output ends connect single-chip microcomputer 5 (MCU), peak sampling hold circuit adopts operational amplifier A D783 and peripheral circuit, and circuit diagram as shown in Figure 5.
Peak value sampling is made up of two parts: first is that peak-seeking keeps module to receive even road output signal, triggers logical block at the signal peak.The second portion logical block judges whether keep this signal according to threshold signal and MCU output signal, then keep module to send the hold signal to peak-seeking as keeping this signal, and notice MCU begins the A/D conversion.
Single-chip microcomputer 5 adopts the Cygnal C8051f021 of company chips, and inner integrated 12bit A/D and 12bitD/A provide a large amount of digital peripherals resources.C8051f021 adopts the instruction pipeline structure, and speed can reach 25MIPS.The ADC switching rate can reach 100ksps in the sheet, can shorten switching time greatly, improves the peak count rate of instrument.Owing to fix the switching time of approach type A/D gradually, thereby the distortion that pulse height distributes significantly reduces.This chip is also being born logic control, data processing, data storage, communication, even road voltage output function.
Data-carrier store connects single-chip microcomputer 5, and data-carrier store is static memory LS621V1024.Data after the pulse amplitude conversion deposit data-carrier store in by single-chip microcomputer 5, and single-chip microcomputer 5 was uploaded to upper computer software from the data-carrier store reading of data when host computer 7 needed to extract data.
File management part is mainly finished work such as storage to data, printing.After data acquisition is finished, click [preservation], the user just can arbitrarily call the data of preserving, and is convenient to comparative analysis.Printing can be printed raw data, data processed result, spectral line etc., can generate written report, is convenient to research, discusses.
Spectral line is handled and mainly to be comprised automatic peak-seeking, level and smooth, the spectrum of demanding perfection tale, ask peak net area, energy calibration, asks peak valley energy resolution etc. when.These functions can help the user to carry out multielement analysis well, determine element classification, characteristic of elements etc.
Automatic peak-seeking: search out correct spectrum peak, and reject ghost peak effectively, analysis is very significant for elemental composition.The peak-seeking process is as follows:
When wanting peak-seeking left and right sides cursor is moved on to by the and arranged on left and right sides in peak-seeking zone, click [peak-seeking] button then and get final product.In the left side at interface [peak-seeking result], just can see needed various parameter, comprise peak position, halfwidth, resolution, peak-to valley ratio etc." peak position " can see the location, road and the road counting at place, peak by downward arrow mark." halfwidth " is the width at half place of peak height; " resolution " is the ratio of halfwidth and location, road; " peak-to valley ratio " is the ratio of the adjacent trough count value of crest count value.
The emphasis district is calculated: the result of calculation in emphasis district is helpful for the concrete data analysis of key area, and computation process is as follows:
Left and right sides cursor is moved on to the left and right sides of region of interest, click [emphasis] then, the zone that reddens is selected emphasis district.Emphasis district result of calculation is presented at the right side, interface.The result comprises that " summation " reaches " net area "." summation " is start channel and the counting summation that finishes all data points between the road; " net area " after for summation deduction background counting and.
Energy calibration: can find out the energy value at different peaks after energy demarcated very intuitively, be highly significant for multielement analysis, and concrete calibration process is as follows:
Should be with the measurement of putting together of two sources when needing energy calibration, the road counting of measurement should be enough big, and preferably the peak count value is greater than 10000.Before demarcation, should be set to level and smooth demonstration by spectral line,, after this can click [energy] button, [energy value is set] dialog box occur, and provide several corresponding Feng Dao location automatically by smoothly removing false peak; Can in the right side window of location, road, import corresponding energy value, click [OK] and can finish energy calibration.Energy unit can be that keV also can be MeV.Finish in the energy calibration postpeak result and can increase the energy calibration value.
Moving cursor/spectral line display mode: the display mode of design move mode of cursor and spectral line is mainly used to user-friendly and better observes spectral line, and operating process is as follows:
Move left cursor to specifying the location, road, need specify place, location, road a mouse click left button, can click tools hurdle [left side mark] button if will accurately move, a dialog box can appear, and location, the road number of importing appointment below [location, road] of this dialog box in the window gets final product.Move right cursor to specifying the location, road, need specify place, location, road a mouse click right button, can click tools hurdle [right mark] button if will accurately move, a dialog box can appear, and location, the road number of importing appointment below [location, road] of this dialog box in the window gets final product.Adopt the division of the very convenient key area of this cursor move mode.
Spectral line has three kinds of display modes: segmentation demonstration, Y-axis are amplified, Y-axis is dwindled, spectrum shows entirely.
[segmentation demonstration]: can observe in whole window with 512 roads is each section spectral line of unit.Be convenient to primary part observation spectral line section interested.
[Y-axis amplification]: whenever by once amplifying 20%.
[Y-axis is dwindled]: whenever by first-stage reduction 20%.
[full spectrum shows]: show entire curve.
Claims (5)
1 one kinds of portable high-speed multi-channel energy spectrometers, it is characterized in that: this device is to connect the pulse shaping unit circuit by pulse signal input terminal, pulse shaping unit circuit output end even road element circuit in parallel and threshold detection unit circuit, even road element circuit output terminal is connected peak value sampling holding unit circuit respectively with the threshold detection unit circuit output end, peak value sampling holding unit circuit output end connects single-chip microcomputer, single-chip microcomputer connected storage; Communication unit is connected with the single-chip microcomputer output interface, and host computer and communication unit are connected to form.
2 according to claim 1 portable high-speed multi-channel energy spectrometer, it is characterized in that: adopt operational amplifier IC01 and IC02 to constitute filtering circuit in the said pulse shaping unit circuit.
3 according to claim 1 portable high-speed multi-channel energy spectrometer, it is characterized in that: adopt D/A converter to constitute even road circuit in the said even road element circuit.
4 according to claim 1 portable high-speed multi-channel energy spectrometer, it is characterized in that: adopt D/A converter in the said threshold detection unit circuit and compare the IC303 follower to constitute.
5 according to claim 1 portable high-speed multi-channel energy spectrometer, it is characterized in that: adopt peak-seeking to keep module and logic module to constitute peak sampling hold circuit in the said peak value sampling holding unit circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201848719U CN201181283Y (en) | 2007-12-18 | 2007-12-18 | Portable high-speed multi-channel energy spectrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201848719U CN201181283Y (en) | 2007-12-18 | 2007-12-18 | Portable high-speed multi-channel energy spectrometer |
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| Publication Number | Publication Date |
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| CN201181283Y true CN201181283Y (en) | 2009-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007201848719U Expired - Fee Related CN201181283Y (en) | 2007-12-18 | 2007-12-18 | Portable high-speed multi-channel energy spectrometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155679A (en) * | 2014-08-28 | 2014-11-19 | 东华理工大学 | Multi-channel energy spectrum analysis meter based on ADS1605 |
| CN112817028A (en) * | 2020-12-29 | 2021-05-18 | 上海工物高技术产业发展有限公司 | Multichannel analyzer zero clearing method, device and system and storage medium |
-
2007
- 2007-12-18 CN CNU2007201848719U patent/CN201181283Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155679A (en) * | 2014-08-28 | 2014-11-19 | 东华理工大学 | Multi-channel energy spectrum analysis meter based on ADS1605 |
| CN112817028A (en) * | 2020-12-29 | 2021-05-18 | 上海工物高技术产业发展有限公司 | Multichannel analyzer zero clearing method, device and system and storage medium |
| CN112817028B (en) * | 2020-12-29 | 2024-02-13 | 上海工物高技术产业发展有限公司 | Multichannel analyzer resetting method, multichannel analyzer resetting device, multichannel analyzer resetting system and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090114 Termination date: 20121218 |