CN1896728A - Ray analyzer and its use - Google Patents
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- CN1896728A CN1896728A CNA2005100145270A CN200510014527A CN1896728A CN 1896728 A CN1896728 A CN 1896728A CN A2005100145270 A CNA2005100145270 A CN A2005100145270A CN 200510014527 A CN200510014527 A CN 200510014527A CN 1896728 A CN1896728 A CN 1896728A
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Abstract
The portable ray analyzer and its usage relates to a instrument to analyze material by making use of ray and measuring secondary emission ,it is composed of ray generator , ray probe , secondary electronic instrument that incorporating high low pressure power source ,the spectrograph amplifier, the multi-pass analyzer and the communication interface to an integral whole, laptop, and software package, the ray generators includes the X ray generator and the gamma neutron generator, the ray probe includes the X ray probe and the gamma ray probe, they have the machinery inserting interface in identical form, the spectrograph amplifier and the multi-pass analyzer have special structure; the use method is: While the sample is required to analyze with the X ray, selecting the X ray generator and the X ray probe; While the sample is required to analyze with the gamma ray, selecting the gamma ray generator and the gamma ray probe. Originally, the ray energy of the portable ray analyzer ranges from X ray to gamma ray, analysis element is much, it is reliable and stable, the power dissipation is low, the usage is convenient.
Description
Technical field
The claimed technical scheme of the present invention relates to a kind of ray that utilizes, and comes the device of analysis of material by measuring Secondary Emission.
Background technology
Ray analyzer is referred to as portable energy spectrometer again, and purposes is widely arranged, and is made of five big technology modules usually, and they are: (1) is used to excite the X ray of material atom or its nuclear to produce source or neutron generation source; (2) X or gamma ray detector; (3) collection spectroscope amplifier, multichannel analyzer, thermoelectric-cooled power supply, it is the secondary electron instrument of one that data transmit control interface; (4) finish the notebook computer of functions such as data processing, analysis, demonstration, storage; (5) software package.Even to this day, ray analyzer both domestic and external all is a kind of fluorescence analyser of single ray.That is to say, or be the fluorescence analyser of X ray, or be gamma-ray energy depressive spectroscopy.Disclosed x-ray fluorescence analyzer is many, wherein Chinese patent has CN 2237241 " a kind of x-ray fluorescence analyzer ", CN 2145381 " uses the x-ray fluorescence analyzer of x-ray lens ", CN 86101103X " fluorescence analyser double compensation spare and method for making ", the newer U.S. and Jap.P. have US 6,122,344 " X-ray inspection system ", US 6,765,986 " X-rayfluorescence analyzer ", US 20040136500 " X-ray analyzer ", JP 2004-191122 " FLUORESCENCE X-RAY ANALYZER ", with JP 2004-138604 " FLUORESCENCE X-RAY ANALYZER ".Domestic known gamma-rays energy depressive spectroscopy has hundreds of HpGe gamma energy spectrometers of China's import in the early stage eighties in last century to the nineties, also has many homemade sodium iodide gamma energy spectrometers simultaneously; The pertinent literature of disclosed gamma-rays energy depressive spectroscopy is few, US 5,369,578 " Method and apparatus for using non-linear spectral fittingprocedures on gamma-ray spectral data " have disclosed a kind of method and instrument based on the gamma-ray spectroscopy data.Above-mentioned known ray analysis instrument not only all is a kind of analyser of single ray, very not convenient in the use, but also it is aging relatively to exist technology to constitute, wherein be no lack of and also adopt cooled with liquid nitrogen to keep work and 286,486 Analytical Data Process with Computer, power consumption is higher, function is less, and it is compact that project organization is owed, the shortcoming that reliability and stability are relatively poor.
Summary of the invention
Technical matters to be solved by this invention is: a kind of ray analyzer and using method thereof that integrates X-ray analyzer and gamma-rays energy depressive spectroscopy is provided, overcome use very convenient, power consumption is higher, function is less, project organization is owed compact, the relatively poor shortcoming of reliability and stability.
The present invention solves this technical problem the technical scheme that is adopted: ray analyzer of the present invention is made of five big technology modules: (1) ray generator, (2) ray detector, (3) collection high-low voltage power source, spectroscope amplifier, multichannel analyzer and communication interface are the secondary electron instrument of one, hereinafter to be referred as the secondary electron instrument, (4) notebook computer, (5) software package, ray generator and ray detector are mechanical connections, ray detector is to be connected with signal wire with the secondary electron instrument, the secondary electron instrument is to be connected with communication cable with notebook computer, software package is directly installed in the notebook computer, wherein, ray generator comprises X-ray producer and γ neutron generator, ray detector comprises X-ray detector and gamma ray detector, and they all have identical shaped mechanical inserted mouth; Spectroscope amplifier is to connect following circuit module by lead to constitute: the baseline restoring circuit connects the buffering input stage circuit, the buffering input stage circuit connects phase inverter, phase inverter connects amplification grade circuit 1, amplification grade circuit 1 connects amplification grade circuit 2 and zero point respectively from equalizing network, amplification grade circuit 2 connects amplification grade circuit 3 and gain programmable controller respectively, amplification grade circuit 3 connects filtering circuit 1, filtering circuit 1 connects filtering circuit 2, filtering circuit 2 connects filtering circuit 3, filtering circuit 3 connects filtering circuit 2 and buffering output-stage circuit respectively, the buffering output-stage circuit connects filtering circuit 3 respectively, zero point is from equalizing network and pile-up rejection circuit, be connected respectively to amplifier stage 1 and buffering output-stage circuit from equalizing network zero point, and the pile-up rejection circuit connects the buffering output-stage circuit; Multichannel analyzer is connected and composed by following circuit module: linear gate connects pulse stretcher and A-D conversion control logic circuit respectively, the upper-level threshold discriminator connects A-D conversion control logic circuit and upper-level threshold able to programme respectively, following threshold discriminator connects A-D conversion control logic circuit and threshold down able to programme respectively, threshold down able to programme connects threshold discriminator and central processing unit down respectively, upper-level threshold able to programme connects upper-level threshold discriminator and central processing unit respectively, pulse stretcher connects linear gate respectively, A-D conversion control logic circuit and high-speed AD transform processor, A-D conversion control logic circuit connects linear gate respectively, the upper-level threshold discriminator, following threshold discriminator, pulse stretcher, pile up rejector circuit, high-speed AD transform processor and central processing unit, pile up rejector circuit and connect A-D conversion control logic circuit, central processing unit connects A-D conversion control logic circuit respectively, threshold down able to programme, upper-level threshold able to programme, working storage, dead time counter and USB communication interface, the high-speed AD transform processor connects pulse stretcher respectively, A-D conversion control logic circuit and working storage, working storage connects high-speed AD transform processor and central processing unit respectively, the dead time counter connects central processing unit, and the USB communication interface connects central processing unit.
Above-mentioned high-speed AD transform processor is a CPU who has 16 1MHz high-speed AD transducers, and central processing unit is that another clock frequency reaches 100MHz's and has the CPU of USB interface as its communication interface.
Electronic devices and components in above-mentioned each circuit module all adopt complete SMD electronic devices and components.
The above-mentioned AD conversion or the Chinese of the A-D conversion meaning are analog-to-digital conversion; The Chinese meaning of CPU is central processing unit.Below identical.
X-ray producer in the ray analyzer of the present invention and γ neutron generator, X-ray detector and gamma ray detector, high-low voltage power source, communication interface and notebook computer all are commercially available known components and parts, and software package adopts existing software program.
The using method of ray analyzer of the present invention is: when sample to be analyzed need carry out X-ray analysis, X-ray producer and X-ray detector are passed through mechanical inserted mouth mechanical inserted, again X-ray detector is connected with signal wire with the secondary electron instrument, the secondary electron instrument with in corresponding X-ray analysis mode software package is housed notebook computer be connected with communication cable, the X ray that produces when shining sample to be analyzed with X-ray producer is received by X-ray detector, and produce corresponding pulses of radiation signal, this signal is by the amplification of spectroscope amplifier, and gathered by multichannel analyzer, import in the notebook computer by communication cable at last, carried out data processing by X-ray analysis mode software, draw analysis result;
When sample to be analyzed need carry out the gamma-rays analysis, use γ neutron generator and gamma ray detector instead by mechanical inserted door mechanical inserted, again gamma ray detector is connected with signal wire with the secondary electron instrument, the secondary electron instrument with in corresponding gamma spectrum spectrum unscrambling software package is housed notebook computer be connected with communication cable, the gamma spectrum that produces when shining sample to be analyzed with the gamma-rays generator is received by gamma ray detector, and produce corresponding pulses of radiation signal, this signal is by the amplification of spectroscope amplifier, and gathered by multichannel analyzer, import in the notebook computer by communication cable at last, carried out data processing by gamma spectrum spectrum unscrambling software, draw analysis result.
The invention has the beneficial effects as follows: replace X-ray producer and γ neutron generator, X-ray detector and the gamma ray detector that uses at any time owing to adopted according to the test needs, the ray energy scope that ray analyzer therefore of the present invention is analyzed is from the X ray to the gamma-rays, the element of analyzing is many, wide application, easy to use.
Spectroscope amplifier in the ray analyzer of the present invention is the spectroscope amplifier of a new generation.In order to overcome the influence that baseline wander in the nuclear spectrum analysis, pulse signal are piled up, zero point drift degenerates to energy resolution, increased zero point in the spectroscope amplifier from equalizing network, pile-up rejection logical circuit and programmable control circuit.Owing to adopted the gain programmable controller, the pile-up rejection controller, zero point is from equalizing network, this spectroscope amplifier recovers except general baseline, utmost point zero-compensation, outside the shaping filter, also possessed gain programmable control, pile-up rejection control, the function of auto-zero, therefore overcome the influence that the pulse base drift causes in the nuclear spectrum analysis resolution degenerates, the influence that the resolution that the probe signal accumulation causes degenerates, the influence of signal noise, amplifier zero point drift is to the influence of power spectrum, coupling between the instrument component has satisfied the linear relationship requirement that nuclear spectrum is analyzed to the influence of signal.In addition, this spectroscope amplifier operation control is full-automatic, in the reliability and stability that improved instrument self greatly, brings great convenience to the user.
Multichannel analyzer in the ray analyzer of the present invention has adopted dual-cpu structure, be that the high-speed AD transform processor is a CPU who has 16 1MHz high-speed AD transducers, central processing unit be another clock frequency can reach 100MHz's and the USB interface that has as its communication interface CPU, also be equipped with linear gate, discriminator able to programme, dead time counter, pile up circuit modules such as rejector circuit and USB communication interface.Therefore, the multichannel pulse scope-analyzer that is made of the foregoing circuit module also has the digital spectrum-stabilizing function, and zero point, automatic calibration function fully manifested the resolving power of semiconductor detector.Compare with CN 85102585 disclosed single board computer type multichannel pulse analyzers, this multichannel analyzer processing speed is fast, and function is strong, and the integrated level height is low in energy consumption, and digital quantization level number (road number) is much larger than single card microcomputer; Compare with the computer multichannel analyzer that CN 200310100471.1 discloses based on USB (universal serial bus), this multichannel analyzer adopts the dual-cpu structure design, need not plug-in AD conversion chip, circuit module adopts complete SMD electronic devices and components, circuit structure is simplified greatly, and is low in energy consumption, multiple functional, the project organization compact and reasonable is more suitable for portable instrument and uses.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the composition module figure of ray analyzer of the present invention.
Fig. 2 is the forming circuit module map of the spectroscope amplifier in the ray analyzer of the present invention.
Fig. 3 is the forming circuit module map of the multichannel analyzer in the ray analyzer of the present invention.
Fig. 4 is that two CPU of the multichannel analyzer in the ray analyzer of the present invention constitute synoptic diagram.
Embodiment
In Fig. 1, form the secondary electron instrument of one by high-low voltage power source, spectroscope amplifier, multichannel analyzer and communication interface; X-ray producer or γ neutron generator and X-ray detector or gamma ray detector are respectively with mechanical socket mechanical connection, X-ray detector or gamma ray detector are connected with signal wire with above-mentioned secondary electron instrument, above-mentioned secondary electron instrument is connected with communication cable with notebook computer, control analysis software for calculation bag is directly installed in the notebook computer, high-low voltage power source also provides electric energy to X-ray producer or γ neutron generator, X-ray detector or gamma ray detector, constitutes ray analyzer of the present invention thus.
Fig. 1 also shows, the X ray that produces when shining sample to be analyzed with X-ray producer is received the gamma spectrum that maybe produces by X-ray detector and is received by gamma ray detector when shining sample to be analyzed with the γ neutron generator, and produce corresponding pulses of radiation signal, this signal is by the amplification of spectroscope amplifier, and gathered by multichannel analyzer, import in the notebook computer by communication cable at last, select for use corresponding analysis software package to carry out data processing.
In Fig. 2, the baseline restoring circuit connects the buffering input stage circuit, the buffering input stage circuit connects phase inverter, phase inverter connects amplification grade circuit 1, amplification grade circuit 1 connects amplification grade circuit 2, amplification grade circuit 2 connects amplification grade circuit 3 and gain programmable controller respectively, amplification grade circuit 3 connects filtering circuit 1, filtering circuit 1 connects filtering circuit 2, filtering circuit 2 connects filtering circuit 3, and filtering circuit 3 connects the buffering output-stage circuit, and the buffering output-stage circuit connects zero point respectively from equalizing network and pile-up rejection circuit, be connected to amplifier stage 1 from equalizing network zero point, connects and composes spectroscope amplifier in the ray analyzer of the present invention with lead thus.
Fig. 2 also shows: treat that amplifying signal is input to the buffering input stage circuit, entering utmost point zero-compensation circuit through the baseline restoring circuit forms, millivolt level pulse signal after the shaping enters amplifying circuit 1 more step by step behind phase inverter, amplifying circuit 2 and amplifying circuit 3, enter filtering circuit 1 more step by step, filtering circuit 2 and filtering circuit 3, through forming low noise amplification pulse signal after three grades of amplifications and three grades of filtering, this pulse signal promptly becomes final amplifier output signal by follow-up collector collection through the impedance matching of buffering output-stage circuit again, the feedback signal that simultaneously final amplifier output signal produces the pile-up rejection signal and forms from equalizing network feedback back by zero point by the pile-up rejection logical circuit again.The feedback signal that the input signal of amplification grade circuit 1 and final amplifier output signal formed after the equalizing network feedback through zero point is coupled, and reaches zero point from steady function, and the enlargement factor of amplification grade circuit 2 is regulated by Programmable Logic Controller.
The basic functional principle of the amplifier in the ray analyzer of the present invention shown in Figure 2 is: the nuclear signal of prime amplifier output is imported into the buffering input stage circuit that is used for the amplifier of ionising radiation semiconductor detector of the present invention, the impedance of circuit is mated mutually before and after making, its sending-end impedance is big as far as possible, and the output terminal impedance is as far as possible little; The baseline restoring circuit that the buffering input stage circuit connects is given the electric capacity impulse electricity by the constant current source of two symmetries, makes capacitor discharge clean in the regular hour, eliminates the baseline superposition phenomenon, reaches the effect that recovers baseline; The pulsewidth and the shape of the utmost point zero-compensation circuit conditioning pulse signal that the buffering input stage circuit connects make pulse signal become triangular wave or high bass wave; The phase inverter that utmost point zero-compensation circuit connects becomes the undersuing of pre-amplification circuit output to be positive pulse signal, so that the amplification filtering of subsequent conditioning circuit; The amplification grade circuit 1 that phase inverter connects and the amplification grade circuit 2 and the amplification grade circuit 3 of follow-up connection, this three-stage amplifier amplify pulse signal makes it in analyzable amplitude range; The gain programmable controller of being introduced by control bus connects amplification grade circuit 2, controls the enlargement factor of amplification grade circuit by programming; The filtering circuit 1 that amplification grade circuit 3 connects and the filtering circuit 2 and the filtering circuit 3 of follow-up connection, these three grades of filtering circuits can effectively suppress high frequency noise and the low-frequency noise in the signal; Circuit impedance coupling before and after the buffering output-stage circuit that filtering circuit 3 connects makes; Buffering output-stage circuit zero point of being connected with amplification grade circuit 1 has constituted the negative feedback of amplification, filtering circuit from equalizing network, and it is opposite that its output variation tendency and amplifier stage are imported variation tendency, reaches and stablize the stability that amplifier stage is imported zero point; Because the randomness of nuclear signal, the interval time of two nuclear signal pulses is very short sometimes, can't separate with circuit, produce the phenomenon of two or more signal pile-up, this accumulation signal demand is rejected, and the pile-up rejection circuit that the buffering output-stage circuit connects produces the pile-up rejection refusal by the pile-up rejection logic, forbids that promptly the pileup pulse signal enters the ADC outside the present invention, the collection analysis that stops this accumulation signal, just the ADC zero passage among the figure.The Chinese meaning of ADC is the high speed analog-to-digital converter.
In Fig. 3, linear gate connects pulse stretcher and A-D conversion control logic circuit respectively, the upper-level threshold discriminator connects A-D conversion control logic circuit and upper-level threshold able to programme respectively, following threshold discriminator connects A-D conversion control logic circuit and threshold down able to programme respectively, threshold down able to programme connects threshold discriminator and central processing unit down respectively, upper-level threshold able to programme connects upper-level threshold discriminator and central processing unit respectively, pulse stretcher connects linear gate respectively, A-D conversion control logic circuit and high-speed AD transform processor, A-D conversion control logic circuit connects linear gate respectively, the upper-level threshold discriminator, following threshold discriminator, pulse stretcher, pile up rejector circuit, high-speed AD transform processor and central processing unit, pile up rejector circuit and connect A-D conversion control logic circuit, central processing unit connects A-D conversion control logic circuit respectively, threshold down able to programme, upper-level threshold able to programme, working storage, dead time counter and USB communication interface, the high-speed AD transform processor connects pulse stretcher respectively, A-D conversion control logic circuit and working storage, working storage connects high-speed AD transform processor and central processing unit respectively, the dead time counter connects central processing unit, the USB communication interface connects central processing unit, connects and composes multichannel analyzer in the ray analyzer of the present invention with lead thus.
Fig. 3 shows that also the signal of exporting from spectroscope amplifier enters linear gate, and the pulse signal that wherein only meets analysis condition just allows to pass through; The pulse signal that meets analysis condition enters pulse stretcher by linear gate, and pulse stretcher keeps the peak value of pulse signal and produces peak signal to start the AD conversion, gathers for the high-speed AD transducer; Signal from spectroscope amplifier output enters the upper-level threshold discriminator simultaneously, whether surpasses the amplitude upper limit that needs analysis to judge pulse signal; Signal from spectroscope amplifier output enters down the threshold discriminator simultaneously, with the amplitude lower limit of judging that whether pulse signal is lower than needs analysis, suppresses noise signal, produces zero cross signal simultaneously; Upper-level threshold screens threshold value and following threshold examination threshold value is carried out programming Control by upper-level threshold able to programme and threshold down able to programme respectively; Pile up rejector circuit generation pile-up rejection signal and send into AD conversion control logic circuit, receive the accumulation signal of exporting from spectroscope amplifier to stop the high-speed AD transform processor, thus the influence that erasure signal is piled up; The high-speed AD transform processor is transformed into the digitizing pulse signal to the analog pulse signal from pulse stretcher, and carries out primary treatment; The working storage storage is from the data of high-speed AD transform processor; Central processing unit carries out data processing and communication is handled, control AD conversion and other circuit modules; Because the randomness of nuclear signal, the nuclear signal that produces in the AD conversion process will be lost, and is called the dead time during this period of time, when carrying out data correction by the dead time in the gatherer process under the dead time counter records; The AD conversion enabling signal of cut-offfing, control that AD conversion control logic circuit received and produced various steering logic signals, control linear gate produces, reaches control dead time counter start-stop; The final gamma-spectrometric data that forms of multichannel analyzer will pass to host computer and handle by the mode of communication, be provided with communication interface here for this reason.Hollow arrow indication circuit intermodule among Fig. 3 is to link to each other with winding displacement, and other then are to link to each other with general lead.
Two CPU of the multichannel analyzer in the ray analyzer of the present invention of Fig. 4 constitute synoptic diagram and show: the high-speed AD transform processor is CPU1, is the CPU that has the high-speed AD transducer of 16 1MHz, and it mainly is the primary treatment of carrying out AD conversion and data; Central processing unit is CPU2, is that clock frequency reaches 100MHz's and has the CPU of USB interface as its communication interface, and its major function is whole control, data processing and exchanges data.The high-speed AD transform processor all is connected with working storage with central processing unit.
Embodiment 1
In the embodiment shown in Figure 2, the baseline restoring circuit connects the buffering input stage, the buffering input stage connects phase inverter, phase inverter connects amplification grade circuit 1, amplification grade circuit 1 connects amplification grade circuit 2, amplification grade circuit 2 connects amplification grade circuit 3 and gain programmable controller respectively, amplification grade circuit 3 connects filtering circuit 1, filtering circuit 1 connects filtering circuit 2, filtering circuit 2 connects filtering circuit 3, and filtering circuit 3 connects the buffering output stage, and the buffering output stage connects zero point respectively from equalizing network and pile-up rejection circuit, be connected to amplifier stage 1 from equalizing network zero point, connects and composes spectroscope amplifier in the ray analyzer of the present invention with lead thus.
Electronic devices and components in above-mentioned each circuit module all adopt complete SMD electronic devices and components.
The key technical indexes that this spectroscope amplifier reached is: 1000 times of highest-gains have control able to programme; The output of positive polarity triangular wave, pulse width≤3 μ s; Long-time stability≤0.1%; Temperature drift≤0.02%; Input end noise level≤15 μ V; Nonlinear distortion≤± 0.1%.
Embodiment 2
In the embodiment shown in fig. 3, linear gate connects pulse stretcher and A-D conversion control logic circuit respectively, the upper-level threshold discriminator connects A-D conversion control logic circuit and upper-level threshold able to programme respectively, following threshold discriminator connects A-D conversion control logic circuit and threshold down able to programme respectively, threshold down able to programme connects threshold discriminator and central processing unit down respectively, upper-level threshold able to programme connects upper-level threshold discriminator and central processing unit respectively, pulse stretcher connects linear gate respectively, A-D conversion control logic circuit and high-speed AD transform processor, A-D conversion control logic circuit connects linear gate respectively, the upper-level threshold discriminator, following threshold discriminator, pulse stretcher, pile up rejector circuit, high-speed AD transform processor and central processing unit, pile up rejector circuit and connect A-D conversion control logic circuit, central processing unit connects A-D conversion control logic circuit respectively, threshold down able to programme, upper-level threshold able to programme, working storage, dead time counter and USB communication interface, the high-speed AD transform processor connects pulse stretcher respectively, A-D conversion control logic circuit and working storage, working storage connects high-speed AD transform processor and central processing unit respectively, the dead time counter connects central processing unit, the USB communication interface connects central processing unit, connects and composes multichannel analyzer in the ray analyzer of the present invention with lead thus.
In the embodiment shown in fig. 4, the high-speed AD transform processor is CPU1, and it has the high-speed AD transducer of 16 1MHz, and it mainly is the primary treatment of carrying out AD conversion and data; Central processing unit is CPU2, and it is that clock frequency reaches 100MHz's and has the central processing unit of USB interface as its communication interface, and its major function is whole control, data processing and exchanges data.The high-speed AD transform processor all is connected with working storage with central processing unit.
Electronic devices and components in above-mentioned each circuit module all adopt complete SMD electronic devices and components.
The performance index that this multichannel analyzer reached are: clock frequency 25MHz; Road, several 256 roads-8192, road is adjustable; Analyst coverage 50mv-5.0v; Integral nonlinearity≤± 0.05%; Differential nonlinearity≤± 0.6%; Low-power consumption≤0.5W; Communication speed＞1MHz.
Embodiment 3
In the embodiment shown in fig. 1, select for use with lower member: (1) domestic and international existing X-ray producer is with the γ neutron generator and make them that identical mechanical inserted mouth be arranged, (2) domestic and international existing thermoelectric-cooled Si-PIN X-ray detector is with thermoelectric-cooled CdTe gamma ray detector and make them that identical mechanical inserted mouth be arranged, (3) with embodiment 1 described spectroscope amplifier, embodiment 2 described multichannel analyzers, the special-purpose high-low voltage power source that cooperates thermoelectric-cooled semiconductor detector Design and Machining: prime amplifier power supply, the thermoelectric (al) cooler power supply, the semiconductor detector high-voltage power supply, spectrum amplifier and multichannel analyzer power supply, constitute the secondary electron instrument, (4) notebook computer and (5) X-ray analysis software package or gamma spectrum spectrum unscrambling software package with reliably commercially available at a high speed communication interface.Above-mentioned (1) is connected with mechanical socket with (2), and (2) are connected with signal wire with (3), and (3) are connected with communication cable with (4), and (5) are directly installed in (4), constitute ray analyzer thus.
Survey the composition of glass with X ray: with X-ray producer and thermoelectric-cooled Si-PIN X-ray detector mechanical inserted, again thermoelectric-cooled Si-PIN X-ray detector is connected with signal wire with above-mentioned secondary electron instrument, the secondary electron instrument with in corresponding X-ray analysis mode software package is housed notebook computer be connected with communication cable; The fluorescent X-ray that produces when shining tested glass with X-ray producer is received by thermoelectric-cooled Si-PIN X-ray detector, and produce corresponding pulses of radiation signal, this signal is by the amplification of spectroscope amplifier, and gathered by multichannel analyzer, import in the notebook computer by communication cable at last, carried out data processing by X-ray analysis mode software, draw analysis result.
With the radioactivity radium in the gamma-ray detection building materials or/and thorium: use γ neutron generator and thermoelectric-cooled CdTe gamma ray detector mechanical inserted instead, again thermoelectric-cooled CdTe gamma ray detector is connected with signal wire with above-mentioned secondary electron instrument, the secondary electron instrument with in corresponding gamma spectrum spectrum unscrambling software package is housed notebook computer be connected with communication cable; The gamma spectrum that produces when shining tested building materials with the gamma-rays generator is received by thermoelectric-cooled CdTe gamma ray detector, and produce corresponding pulses of radiation signal, this signal is by the amplification of spectroscope amplifier, and gathered by multichannel analyzer, import in the notebook computer by communication cable at last, carried out data processing by gamma spectrum spectrum unscrambling software, draw analysis result.
The performance of this ray analyzer is: energy spectrometer wide ranges, but Analysis of X ray and gamma-rays, small-sized, portable, low-power consumption, cumulative volume 20 * 30 * 30cm
3, carry out automatically when total power consumption is used less than 20W, field condition adjusting at temperature compensation and zero point, purposes is wide, uses easy to operate.
The key technical indexes of this ray analyzer is: can analyze above 40 to the 60 kinds of elements of sodium, the instrumental analysis precision is error＜0.2% of error＜0.5% of light element, the above element of middle weight, the undulatory property of instrument long-term work≤0.2%.
Claims (4)
1. ray analyzer, constitute by five big technology modules: (1) ray generator, (2) ray detector, (3) collection high-low voltage power source, spectroscope amplifier, multichannel analyzer and communication interface are the secondary electron instrument of one, hereinafter to be referred as the secondary electron instrument, (4) notebook computer, (5) software package, ray generator and ray detector are mechanical connections, ray detector is to be connected with signal wire with the secondary electron instrument, the secondary electron instrument is to be connected with communication cable with notebook computer, software package is directly installed in the notebook computer, it is characterized in that: wherein, ray generator comprises X-ray producer and γ neutron generator, ray detector comprises X-ray detector and gamma ray detector, and they all have identical shaped mechanical inserted mouth; Spectroscope amplifier is to connect following circuit module by lead to constitute: the baseline restoring circuit connects the buffering input stage circuit, the buffering input stage circuit connects phase inverter, phase inverter connects amplification grade circuit 1, amplification grade circuit 1 connects amplification grade circuit 2 and zero point respectively from equalizing network, amplification grade circuit 2 connects amplification grade circuit 3 and gain programmable controller respectively, amplification grade circuit 3 connects filtering circuit 1, filtering circuit 1 connects filtering circuit 2, filtering circuit 2 connects filtering circuit 3, filtering circuit 3 connects filtering circuit 2 and buffering output-stage circuit respectively, the buffering output-stage circuit connects filtering circuit 3 respectively, zero point is from equalizing network and pile-up rejection circuit, be connected respectively to amplifier stage 1 and buffering output-stage circuit from equalizing network zero point, and the pile-up rejection circuit connects the buffering output-stage circuit; Multichannel analyzer is connected and composed by following circuit module: linear gate connects pulse stretcher and A-D conversion control logic circuit respectively, the upper-level threshold discriminator connects A-D conversion control logic circuit and upper-level threshold able to programme respectively, following threshold discriminator connects A-D conversion control logic circuit and threshold down able to programme respectively, threshold down able to programme connects threshold discriminator and central processing unit down respectively, upper-level threshold able to programme connects upper-level threshold discriminator and central processing unit respectively, pulse stretcher connects linear gate respectively, A-D conversion control logic circuit and high-speed AD transform processor, A-D conversion control logic circuit connects linear gate respectively, the upper-level threshold discriminator, following threshold discriminator, pulse stretcher, pile up rejector circuit, high-speed AD transform processor and central processing unit, pile up rejector circuit and connect A-D conversion control logic circuit, central processing unit connects A-D conversion control logic circuit respectively, threshold down able to programme, upper-level threshold able to programme, working storage, dead time counter and USB communication interface, the high-speed AD transform processor connects pulse stretcher respectively, A-D conversion control logic circuit and working storage, working storage connects high-speed AD transform processor and central processing unit respectively, the dead time counter connects central processing unit, and the USB communication interface connects central processing unit.
2. ray analyzer according to claim 1, it is characterized in that: high-speed AD transform processor wherein is a CPU who has 16 1MHz high-speed AD transducers, and central processing unit is that another clock frequency reaches 100MHz and has the CPU of USB interface as its communication interface.
3. ray analyzer according to claim 1 is characterized in that: the electronic devices and components in each circuit module all adopt complete SMD electronic devices and components.
4. the using method of the described ray analyzer of claim 1, sample to be analyzed it is characterized in that: when need carry out X-ray analysis, X-ray producer and X-ray detector are passed through mechanical inserted mouth mechanical inserted, again X-ray detector is connected with signal wire with the secondary electron instrument, the secondary electron instrument with in corresponding X-ray analysis mode software package is housed notebook computer be connected with communication cable, the X ray that produces when shining sample to be analyzed with X-ray producer is received by X-ray detector, and produce corresponding pulses of radiation signal, this signal is by the amplification of spectroscope amplifier, and gathered by multichannel analyzer, import in the notebook computer by communication cable at last, carried out data processing by X-ray analysis mode software, draw analysis result;
When sample to be analyzed need carry out the gamma-rays analysis, use γ neutron generator and gamma ray detector instead by mechanical inserted mouth mechanical inserted, again gamma ray detector is connected with signal wire with the secondary electron instrument, the secondary electron instrument with in corresponding gamma spectrum spectrum unscrambling software package is housed notebook computer be connected with communication cable, the gamma spectrum that produces when shining sample to be analyzed with the gamma-rays generator is received by gamma ray detector, and produce corresponding pulses of radiation signal, this signal is by the amplification of spectroscope amplifier, and gathered by multichannel analyzer, import in the notebook computer by communication cable at last, carried out data processing by gamma spectrum spectrum unscrambling software, draw analysis result.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419288B (en) * | 2008-11-24 | 2011-11-16 | 北京航空航天大学 | Digital intelligent nuclear detecting and counting device based on bluetooth wireless networks |
| CN101101269B (en) * | 2006-06-22 | 2012-02-29 | 精工电子纳米科技有限公司 | Energy dispersion type radiation detecting system and method of measuring content of object element |
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| CN101101269B (en) * | 2006-06-22 | 2012-02-29 | 精工电子纳米科技有限公司 | Energy dispersion type radiation detecting system and method of measuring content of object element |
| CN101419288B (en) * | 2008-11-24 | 2011-11-16 | 北京航空航天大学 | Digital intelligent nuclear detecting and counting device based on bluetooth wireless networks |
| CN101561507B (en) * | 2009-05-21 | 2012-07-04 | 清华大学 | Ray energy detection method for ray detector |
| CN103364821A (en) * | 2012-03-29 | 2013-10-23 | 杭州核安科技有限公司 | Method for dynamically detecting radioactive source and monitoring system thereof |
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| CN104615111A (en) * | 2015-01-09 | 2015-05-13 | 深圳市西凡谨顿科技有限公司 | Adjustable amplification factor type analogue multi-channel acquiring amplifying device and system |
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