CN102621572A - Radioactive pulse amplitude digital discriminator - Google Patents
Radioactive pulse amplitude digital discriminator Download PDFInfo
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- CN102621572A CN102621572A CN2012100954487A CN201210095448A CN102621572A CN 102621572 A CN102621572 A CN 102621572A CN 2012100954487 A CN2012100954487 A CN 2012100954487A CN 201210095448 A CN201210095448 A CN 201210095448A CN 102621572 A CN102621572 A CN 102621572A
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Abstract
The invention discloses a radioactive pulse amplitude digital discriminator. The radioactive pulse amplitude digital discriminator comprises a signal follower module, a high-speed analog/digital (AD) converter, a field-programmable gate array (FPGA) data acquisition and processing molding module and the like, wherein the signal follower module realizes high-speed acquisition of signals by using a high-speed linear amplifier, and is connected with the high-speed AD converter; the high-speed converter finishes high-speed digital quantization of pulse signals and then inputs the signals to the FPGA data acquisition and processing molding module; and the FPGA data acquisition and processing molding module finishes front edge and back edge identification of radioactive pulses, caching of pulse data, processing and molding of the pulse data, and the molded pulses can be output to a scaler or a counter for counting and scaling, and also can be transmitted to a singlechip system to finish pulse counting to ensure that a computer can detect and display the pulses. The radioactive pulse amplitude digital discriminator solves the problems of superimposition and calibration of the radioactive pulses during high-count-rate measurement.
Description
Technical field
The present invention relates to a kind of radioactivity pulse height numeral discriminator.
Background technology
In the radioactivity survey system, the number of radioactivity pulse is directly proportional with the radioactivity of measuring samples, and the radioactivity pulse is discerned by discriminator and integer output usually.General discriminator is relatively simple for structure, is realized by comparer usually, to discriminator a discrimination threshold is set, and signal amplitude is just exported the pulse after the integer greater than discrimination threshold, less than just not output of discrimination threshold.In the measuring system of multiwire proportional counter; Because the power spectrum of β sample is continuous; Its pulse front edge is steeper, and the back edge of pulse is dragged very longly, and the amplitude of radioactivity pulse is a continuous distribution in such measuring system; Under the situation of high count rate, be easy to generate the stack of pulse, especially greater than 10
4During the high count rate radioactivity survey of CPS, the radioactivity superimposed pulses must be proofreaied and correct screening and the influence of count results begins to manifest.Present bearing calibration uses The software adopted nonlinear fitting mode to realize mostly; The subject matter of this method is the situation that pulse-losing under little situation of several recurrent intervals, can occur; And be two situation in the big pulse situation of high-amplitude next possibly appearance a pulse recognition, the wrong failure that will directly cause count results mistake and measurement is screened in pulse.
Summary of the invention
The objective of the invention is to design a kind of radioactivity pulse height numeral discriminator; Changing traditional discriminator adopts comparer to accomplish the simple way that the back depended software is proofreaied and correct of gathering; Start with from two aspects of hardware and software; The radioactivity superimposed pulses is distinguished, solved the deficiency of above-mentioned classic method.
The technical solution adopted for the present invention to solve the technical problems is: a kind of radioactivity pulse height numeral discriminator is provided, it is characterized in that: comprise ingredients such as signal follower module, high-speed A/D converter, FPGA data acquisition and processing (DAP) forming module; Comprise also that in addition data acquisition, pulse recognition and overlap-add procedure software can distinguish and proofread and correct the stack of radioactivity pulse in the high count rate radioactivity survey.
According to radioactivity pulse height numeral discriminator provided by the invention, it is characterized in that: said signal follower module adopts the high-speed linear amplifier to realize the high speed acquisition to signal, and is connected to high-speed A/D converter; After the high-speed figure of said high-speed A/D converter completion pulse signals quantizes signal is inputed to FPGA data acquisition and processing (DAP) forming module.
According to radioactivity pulse height numeral discriminator provided by the invention; It is characterized in that: said FPGA data acquisition and processing (DAP) forming module is accomplished the forward position of radioactivity pulse and is handled shaping work with the back along identification, buffer memory pulse data, pulse data; Pulse after the moulding may be output to scaler or counter is used for counting and calibration; Also can send SCM system to and accomplish step-by-step counting, supply COMPUTER DETECTION and demonstration.
According to radioactivity pulse height numeral discriminator provided by the invention, it is characterized in that: comprise data acquisition, pulse recognition and overlap-add procedure software, comprise following function:
1, data acquisition software is divided into two kinds of mode of operations:
A, real-time mode collection: FPGA receive that the acquisition controlling signal then begins image data, and the full predetermined data number of collection is then gathered and stopped;
B, mode of operation collection: FPGA judge according to the transformation result of AD converter, when a pulse front edge arrives, begin to gather, and when pulse back edge arrives, stop to gather;
2, pulse recognition and overlap-add procedure software carry out digital filtering with the data that collect earlier, remove big jumping point, then waveform are asked first order derivative, carry out pulse decomposition and overlap-add procedure according to the size of first order derivative; The data that satisfy rated condition can be identified as a pulse, pulse of output on the output port of FPGA.
The invention has the beneficial effects as follows: adopted high speed signal follower module and high-speed A/D converter; Behind signals collecting and digital quantization; Utilize the corresponding software of FPGA combination of hardware to do digital processing; Solve the differentiation and the calibration problem of overlapping radioactivity pulse signal, made digit pulse amplitude discriminator measurement result present linearity.On data acquisition scheme, adopt and gather in real time and two kinds of patterns of work collection, can select working method flexibly according to the actual needs of measuring.On moulding pulse output interface, adopted two kinds of output channels, can directly supply scaler or rolling counters forward, also can with the SCM system two-way communication, be sent to computer terminal to the moulding pulse information and show and use.
Description of drawings
Fig. 1 is the catenation principle figure of radioactivity pulse height numeral discriminator provided by the invention.
Fig. 2 is a data acquisition software process flow diagram provided by the invention.
Fig. 3 is pulse recognition provided by the invention and overlap-add procedure software flow pattern.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is carried out detailed description:
Fig. 1 is the catenation principle figure of radioactivity pulse height numeral discriminator provided by the present invention, it is characterized in that comprising ingredients such as signal follower module, high-speed A/D converter, FPGA data acquisition and processing (DAP) forming module; Comprise also that in addition data acquisition, pulse recognition and overlap-add procedure software can distinguish and proofread and correct the stack of radioactivity pulse in the high count rate radioactivity survey.
Said signal follower module has been used the high-speed linear amplifier, has low-power consumption high bandwidth and low noise double operational and can accomplish the requirement of high-speed A/D converter to signal; The high-speed figure that said high-speed A/D converter can be accomplished pulse signal quantizes; Used high-speed A/D converter is to have 12 high-speed A/D converters that maximum can reach 65MHz sampling rate, low-power consumption; Its sampling rate can have third gear to select, and can realize 20MSPS, 40MSPS and three kinds of speed samplings of 60MSPS.It is fixed that the principle of its selection can be come according to the width of radioactivity pulse, when the radioactivity pulse width is big, can select the sampling rate of 20MSPS to measure, and when radioactivity pulse width hour, can select the sampling rate of 60MSPS to measure; After the radioactivity pulse signal quantizes through high-speed ADC; Be temporary among the RAM in the FPGA with numeral; FPGA data acquisition that the present invention adopted and processing forming module; Its core processor has advantages such as single-chip, low-power consumption, high reliability, can accomplish the rising edge of radioactivity pulse and handle shaping work with the back along identification, buffer memory pulse data, pulse data.The software based on FPGA that the present invention comprises has comprised data acquisition, pulse recognition and overlap-add procedure function.
Fig. 2 is a data acquisition software process flow diagram of the present invention, when the real-time mode acquired signal, when FPGA receives the acquisition controlling signal, just begins to gather, and accomplishes pulse collection after the full predetermined data number of collection, and starts overlap-add procedure and data distributing program; When the mode of operation acquired signal; To judge according to the transformation result of ADC; At first to when pulse arrives, begin image data and preserve, judge that the method that effective impulse arrives is whether to judge the forward position range value of pulse greater than the discrimination threshold of stipulating, if less than discrimination threshold then represent that the signal that collects is a noise; Arrive if represent the forward position of effective impulse greater than discrimination threshold, begin sampling and record; When detecting pulse back edge, pulse back edge and discrimination threshold are compared, if greater than discrimination threshold; Indicating impulse does not finish as yet; Continue to read the data of AD converter output,, accomplish the data acquisition of a pulse if arrive less than the back edge of discrimination threshold indicating impulse; Stop sampling and record, the function of starting impulse identification simultaneously and overlap-add procedure module.
Fig. 3 is pulse recognition of the present invention and overlap-add procedure software flow pattern; FPGA carries out 2 ~ 3 digital filtering with the pulse data that collects earlier; Remove big jumping point, number of pulses is according to asking first order derivative, if the first order derivative pulse width is less than Rack then; Think that then the gained pulse signal is a noise signal, refuses record; If the first order derivative pulse width greater than Rack, is then carried out the judgement of first order derivative zero passage detection number.When first order derivative zero passage number was 1, expression gained pulse signal was the pulse signal that does not have stack, can be identified as a pulse, pulse of output on the output port of FPGA, and preserve the data after handling.When first order derivative zero passage number is not 1, calculate the width of two adjacent first order derivative zero crossings, if greater than Rack; Then carry out the differentiating and processing of superposed signal; Then be identified as a pulse less than Rack, pulse of output on the output port of FPGA, and preserve the data after handling.
The present invention has following characteristics:
1, on hardware designs, adopted high-speed linear amplifier, high-speed A/D converter, compare with traditional discriminator, can accomplish the radioactivity pulse data of high count rate and gather requirement.
2, on the core component of discriminator, adopt control and its processing core of FPGA as discriminator, accomplish the forward position of radioactivity pulse and handle shaping work along identification, buffer memory pulse data, pulse data with the back.
3, on the output interface of moulding pulse; Two kinds of interface modes are provided; A kind of is directly to export scaler or counter to be used for counting and calibration, and another kind of mode provides the communication interface function with SCM system, can the moulding pulse data be transferred to SCM system and accomplish step-by-step counting; By SCM system and compunication, be implemented in the detection and the demonstration of computer terminal.
4, on performance, overcome the identification difficult problem of general discriminator superimposed pulses under high count rate, improved recognition correct rate, guaranteed radioactivity survey result's accuracy.
Claims (4)
1. radioactivity pulse height numeral discriminator; Can in the high count rate radioactivity survey, distinguish and proofread and correct, it is characterized in that: comprise ingredients such as signal follower module, high-speed A/D converter, FPGA data acquisition and processing (DAP) forming module the stack of radioactivity pulse; Also comprise data acquisition, pulse recognition and overlap-add procedure software in addition.
2. radioactivity pulse height numeral discriminator according to claim 1, it is characterized in that: said signal follower module adopts the high-speed linear amplifier to realize the high speed acquisition to signal, and is connected to high-speed A/D converter; After the high-speed figure of said high-speed A/D converter completion pulse signals quantizes signal is inputed to FPGA data acquisition and processing (DAP) forming module.
3. radioactivity pulse height numeral discriminator according to claim 1; It is characterized in that: said FPGA data acquisition and processing (DAP) forming module is accomplished the forward position of radioactivity pulse and is handled shaping work with the back along identification, buffer memory pulse data, pulse data; Pulse after the moulding may be output to scaler or counter is used for counting and calibration; Also can send SCM system to and accomplish step-by-step counting, supply COMPUTER DETECTION and demonstration.
4. radioactivity pulse height numeral discriminator according to claim 1 is characterized in that: comprise data acquisition, pulse recognition and overlap-add procedure software, comprise following function:
(1) data acquisition software is divided into two kinds of mode of operations:
A, real-time mode collection: FPGA receive that the acquisition controlling signal then begins image data, and the full predetermined data number of collection is then gathered and stopped;
B, mode of operation collection: FPGA judge according to the transformation result of AD converter, when a pulse front edge arrives, begin to gather, and when pulse back edge arrives, stop to gather;
(2) pulse recognition and overlap-add procedure software carry out digital filtering with the data that collect earlier, remove big jumping point, then waveform are asked first order derivative, carry out pulse decomposition and overlap-add procedure according to the size of first order derivative; The data that satisfy rated condition can be identified as a pulse, pulse of output on the output port of FPGA.
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| CN2012100954487A CN102621572A (en) | 2012-04-01 | 2012-04-01 | Radioactive pulse amplitude digital discriminator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103713310A (en) * | 2014-01-02 | 2014-04-09 | 四川新先达测控技术有限公司 | Nuclear pulse signal high speed digital separation method and system and digital spectrometer |
| CN110988495A (en) * | 2019-12-12 | 2020-04-10 | 江苏科技大学 | High-speed pulse signal amplitude measuring method |
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| CN101034120A (en) * | 2007-03-09 | 2007-09-12 | 中国科学院上海光学精密机械研究所 | Pulse shape measuring device and measuring method thereof |
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2012
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| US6903344B2 (en) * | 2003-03-25 | 2005-06-07 | Cti Pet Systems, Inc. | Baseline correction in PET utilizing continuous sampling ADCs to compensate for DC and count rate errors |
| CN1979220A (en) * | 2005-12-01 | 2007-06-13 | 中国科学院高能物理研究所 | High-speed parallel multi-path multi-path-data system for mulclear spectroscope and nuclear electronics |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713310A (en) * | 2014-01-02 | 2014-04-09 | 四川新先达测控技术有限公司 | Nuclear pulse signal high speed digital separation method and system and digital spectrometer |
| CN103713310B (en) * | 2014-01-02 | 2015-12-02 | 四川新先达测控技术有限公司 | A kind of core pulse signal high-speed figure separation method, system and Digital Spectrometer |
| CN110988495A (en) * | 2019-12-12 | 2020-04-10 | 江苏科技大学 | High-speed pulse signal amplitude measuring method |
| CN110988495B (en) * | 2019-12-12 | 2021-12-14 | 江苏科技大学 | High-speed pulse signal amplitude measuring method |
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Application publication date: 20120801 |