CN103234986A - An intelligent electronic device, a QXAFS (quick X-ray absorption fine structure) system and a data acquisition and motor control method - Google Patents
An intelligent electronic device, a QXAFS (quick X-ray absorption fine structure) system and a data acquisition and motor control method Download PDFInfo
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Abstract
The application discloses an intelligent electronic device, a QXAFS (quick X-ray absorption fine structure) system and a data acquisition and motor control method. The intelligent electronic device replaces a stepper motor controller and a scaler in a conventional XAFS (X-ray absorption fine structure) experimental system; and by employing a programmable device as a core component, the electronic device realizes analog acquisition via a multi-channel ADC acquisition circuit combining with a current amplifier in the quick XAFS system, or realizes integral form data acquisition by using the counting function of a programmable device combining a V / F converter on the quick XAFS system. The programmable device controls the stepper motor through reading a control curve configured in a RAM, while performs data acquisition in a control segment allowing the data acquisition, thus achieving a high-speed synchronization of the stepper motor and the data acquisition, and through sampling data in the stationary or slow control segment of the control curve, preventing energy movement in the process of data acquisition, and obtaining a best solution in the contradiction between a spectrum sweep speed and the energy movement.
Description
Technical field
The application relates to modern structure of matter analytical approach-synchrotron radiation experimental technique, particularly relate to a kind of rapid X-ray that is exclusively used in and absorb fine structure (Quick X-ray Absorption Fine Structure, QXAFS) Shi Yan intellectronics equipment, data acquisition and method for controlling stepping motor during XAFS experimental system and the quick XAFS that uses this intellectronics equipment to implement test fast.
Background technology
Modern XAFS experimental system is based on the instrument of the large-scale structure of matter analysis and research of Synchrotron Radiation, its ultimate principle is the sample that utilizes the monoenergetic x-ray bombardment to be studied, in specific X ray energy range, progressively change the energy of monoenergetic X ray, realize energy scan, survey the intensity of sample front and back X ray simultaneously, thereby obtain sample at the absorption line of specific energy range, analyze the micromechanism information that this absorption line then can obtain sample.The XAFS experimental technique is widely used in the research in multidisciplinary fields such as physics, chemistry, catalysis, material, environment, biology, is one of most widely used analytical approach in the many experimental techniques of synchrotron radiation.
Fig. 1 has schematically shown a kind of structured flowchart of conventional XAFS experimental system.In Fig. 1, synchrotron radiation X-ray incides on the double-crystal monochromator 101, double-crystal monochromator 101 is with the synchrotron radiation X-ray monochromatization, for example, the homogeneous X-ray that has only wavelength to satisfy cloth loudspeaker lattice (Bragg) relation obtains reflection, when rotating the incident angle of double-crystal monochromator 101 change X ray, the outgoing light wavelength changes thereupon, thereby the adjustable X ray of monoenergetic that can realize the XAFS requirement of experiment is done energy (wavelength) scanning.Monoenergetic X ray and sample effect from double-crystal monochromator 101 outgoing.
The ionization chamber X-ray detector 103(while detection criterion sample that the monoenergetic X ray enters after being positioned at sample preceding ionization chamber X-ray detector 103, sample and being positioned at sample can also have the 3rd ionization chamber X-ray detector).Before and after ionization chamber X-ray detector 103 measure respectively with sample effect before X ray intensity and with sample effect after the intensity of X ray, namely can obtain the XAFS spectrum.
The weak current signal feed-in current amplifier 105 of detector 103 outputs of ionization chamber.The current signal amplification that the X ray intensity that current amplifier 105 will produce with the X-ray detector of sample front and back is directly proportional also converts analog voltage signal to.The number of current amplifier can be at least two.The analog voltage signal that current amplifier 105 obtains is corresponding with the intensity of monoenergetic X ray, can obtain the intensity of X ray based on the output valve of current amplifier 105.The duty of current amplifier 105 can (General Purpose interface Bus GPIB) arranges by general purpose interface bus by computing machine.
Voltage/frequency (V/F) converter 106 will convert pulse duration frequency signal to from the analog voltage signal of current amplifier 15 outputs, and the pulse duration frequency signal of 107 pairs of V/F converters of scaler, 106 outputs is counted, and count value is transferred to computing machine 108.By the count value of scaler 107, can obtain with sample effect before and after the intensity of X ray.
Shaft-position encoder 109 reads the current angle of double-crystal monochromator 101, and shows and be transferred to computing machine 108 by display 110.Computing machine 108 transmits control signal to linear motor driver 112, controls rolling the angle and throwing the angle of double-crystal monochromator 101.Linear motor driver 112 is connected with computing machine 108, can realize manual control.
In addition, can be connected by gpib bus between current amplifier 105 and controllor for step-by-step motor 114 and computing machine and the current amplifier 105, carry out various required communications, can be connected by RS232 between computing machine 108 and controllor for step-by-step motor 114, linear motor driver 112 and the display 110.
When adopting the system of Fig. 1 to adopt spectrum at a slow speed, once adopt the spectrum process and constituted by control and the data acquisition of a plurality of energy points.For each energy point, all be earlier to produce the monoenergetic X ray by the stepper motor stepping, wait stepper motor stop motion, X ray energy stabilization after, begin image data again.The advantage of this method is: when data acquisition, the X ray energy is stable, the signal to noise ratio (S/N ratio) height of measurement result.
Quick XAFS(QXAFS) mode is the development to conventional XAFS experimental technique, can provide to have time-resolved structural information, thereby be the important experimental technique of material, chemistry, catalytic field research chemical reaction mechanism, phase transformation and dynamic process.The QXAFS method is based on the synchrotron radiation X AFS experimental system of routine, substitute the conventional pattern of energy scan step by step (step by step mode) with Continuous Energy scan pattern (continuing mode), bring up to spectrum of second-time with adopting spectrum speed from spectrum of about 10 minutes magnitudes of conventional XAFS experiment.
But adopting the raising of spectrum speed, is cost to sacrifice the quality of data.From the spectroscopy angle, the quality of data of original spectrum comprises two aspects, XAFS concussion information and statistical noise in the spectrum.XAFS concussion distortion causes the distortion of neighbour's structural information, statistical noise then to be superimposed on XAFS concussion waveform, makes it lose break-up value.More the QXAFS embodiment of delivering is at present paid attention to adopt the raising of spectrum speed and has been ignored image data method for quality and measure.In fact, the QXAFS method can not be pursued merely fast, and the purpose of QXAFS is exactly to reach balance optimizing between the two adopting spectrum speed and the quality of data.
Summarize, when adopting spectrum fast based on system shown in Figure 1, there are the following problems:
(1) controllor for step-by-step motor and data collector (for example current amplifier among Fig. 1 105, V/F converter 106 and scaler 107 etc.) are separate devices, there is not sync cap between them, can only be undertaken synchronously by computer software, be subject to the communication speed of computing machine and peripheral hardware, the internal work mechanism of peripheral hardware etc., can't realize therefore having limited the spectrum speed of adopting fast synchronously.
(2) in order to realize quick scanning, adopt continuous mode in the QXAFS experimentation, i.e. image data when stepper motor moves, then in the data acquisition time t of single energy point, must have energy move Δ E(can quantitative changeization), this has just caused data distortion, and the result causes XAFS concussion distortion.
(3) when an energy point carried out data acquisition, the statistical error of its data was expressed as formula one:
Wherein N is the data acquisition amount of this energy point, and I is signal intensity, and t is the data acquisition time of this point.Adopt the QXAFS method to shorten and adopt the spectrum time, t must reduce, and then statistical error must increase.
(4) different data acquisition circuit scheme, for example analog digital conversion (ADC) sampling plan (being to adopt current amplifier 105 to obtain mode with X ray intensity corresponding voltage value among Fig. 1) or integration scheme (being to adopt the combination of V/F converter 106+ scaler 107 to obtain method with the corresponding count value of the intensity of X ray among Fig. 1), its efficient difference, the N value of namely gathering in identical time t is different.Thereby setting up rational data acquisition hardware is the importance of optimizing the QXAFS method.
(5) detection system life period constant for example rise time of the reaction velocity of ionization chamber detector 103, current amplifier 105 etc., all can influence XAFS concussion structure, causes XAFS concussion wave form distortion to cause the distortion of neighbour's structural information.As seen, improving detection system hardware, also is the importance of optimizing the QXAFS method.
(6) the inaccurate spectrum that will cause of phase place of losing step and stepping and sampling in the QXAFS experiment energy scan process also causes XAFS concussion wave form distortion to cause the distortion of neighbour's structural information in the distortion of energy axes.
(7) in addition, be to optimize the QXAFS method, whole Hardware Design is the compressed signal time overhead handling and transmit to greatest extent, to improve the spectrum speed of adopting to greatest extent.
Summary of the invention
One or more in addressing the above problem, the application provides the intellectronics equipment of a kind of QXAFS of being exclusively used in experiment, XAFS experimental system and use data acquisition and method for controlling stepping motor in the quick XAFS experiment that this intellectronics equipment implements fast, uses this intellectronics equipment to replace controllor for step-by-step motor and scaler in the conventional XAFS experimental system.
The application discloses a kind of intellectronics equipment that is exclusively used in quick XAFS experiment, comprising: in hyperchannel analog to digital conversion Acquisition Circuit and the multichannel buffer circuit one of at least, programming device, first buffer circuit and communication interface circuit:
Described hyperchannel analog to digital conversion Acquisition Circuit is used for and will converts digital signal to from the analog voltage signal of at least two current amplifiers, and the current signal amplification that the X ray intensity that described at least two current amplifiers are used for producing with the X-ray detector of quick XAFS experiment and sample front and back be directly proportional also converts analog voltage signal to;
The multichannel buffer circuit is used for realizing from the pulse duration frequency signal of electric voltage/frequency converter and the electric isolation between the described programming device that described electric voltage/frequency converter is used for converting the analog voltage signal of described at least two current amplifiers to pulse duration frequency signal;
Programming device is connected with described multichannel buffer circuit with described hyperchannel analog to digital conversion Acquisition Circuit, be used for receiving the signal of described hyperchannel analog to digital conversion Acquisition Circuit output, pulse duration frequency signal to described electric voltage/frequency converter input is counted, and store the signal of described hyperchannel analog to digital conversion Acquisition Circuit output and the count value that the pulse duration frequency signal of described electric voltage/frequency converter input is counted into first in first out (First In First Out that described programming device carries, FIFO) in the data buffer, read for computing machine;
In the control curved configuration RAM that described programming device carries, be provided with the Stepping Motor Control curve in advance, the different control sections of stepper motor and the relation between the Stepping Motor Control pulsed frequency when described control curve definitions carries out data acquisition at the different-energy point, described different control sections comprise static control section, the at the uniform velocity control section after the deceleration or the at the uniform velocity control section after the acceleration and the acceleration control section of not carrying out data acquisition that allows data acquisition;
Described programming device is used for sending gating pulse to stepper motor driver and rotating with the control step motor by reading described Stepping Motor Control curve, and the at the uniform velocity control section in described static control section, after slowing down and accelerate after postpone the beginning data acquisition through default after at the uniform velocity control section begins;
Described first buffer circuit is connected with described programming device, is used for the electric isolation between the described programming device of realization and the described stepper motor driver;
Described communication interface circuit is connected with described programming device, is used for the communication between the described programming device of realization and the described computing machine.
Disclosed herein as well is a kind of quick XAFS experimental system, comprising:
The synchrotron radiation X-ray source;
Double-crystal monochromator is with the X ray monochromatization of described synchrotron radiation X-ray source output, to obtain the required monoenergetic X ray of quick XAFS experiment;
Shaft-position encoder is for the angle of surveying described double-crystal monochromator;
Stepper motor is used for the described double-crystal monochromator of control and rotates;
Stepper motor driver electrically connects with described stepper motor, is used for driving described stepper motor and rotates;
At least two current amplifiers, the current signal amplification that the X ray intensity that is used for producing with the X-ray detector of quick XAFS experiment and sample front and back be directly proportional also converts analog voltage signal to;
Electric voltage/frequency converter is connected with described two current amplifiers at least, is used for converting the analog voltage signal of described at least two current amplifiers to pulse duration frequency signal;
Computing machine be used for to receive the angle of the described double-crystal monochromator that described shaft-position encoder detects; And
Intellectronics equipment comprises: in hyperchannel analog to digital conversion Acquisition Circuit and the multichannel buffer circuit one of at least, programming device, first buffer circuit and communication interface circuit:
Described hyperchannel analog to digital conversion Acquisition Circuit and described at least two current amplifiers electrically connect, and are used for and will convert digital signal to from the analog voltage signal of at least two current amplifiers;
The multichannel buffer circuit is disposed between described electric voltage/frequency converter and the described programming device, is used for realizing from the pulse duration frequency signal of described electric voltage/frequency converter and the electric isolation between the described programming device;
Programming device is connected with described multichannel buffer circuit with described hyperchannel analog to digital conversion Acquisition Circuit, be used for receiving the signal of described hyperchannel analog to digital conversion Acquisition Circuit output, pulse duration frequency signal to described electric voltage/frequency converter input is counted, and store in the first in first out data buffer that described programming device carries with the signal of described hyperchannel analog to digital conversion Acquisition Circuit output with to the count value that the pulse duration frequency signal of described at least two electric voltage/frequency converters input is counted, read for described computing machine;
In the control curved configuration RAM that described programming device carries, be provided with the Stepping Motor Control curve in advance, the different control sections of stepper motor and the relation between the Stepping Motor Control pulsed frequency when described control curve definitions carries out data acquisition at the different-energy point, described different control sections comprise static control section, the at the uniform velocity control section after the deceleration or the at the uniform velocity control section after the acceleration and the acceleration control section of not carrying out data acquisition that allows data acquisition;
Described programming device is used for sending gating pulse to described stepper motor driver and rotating with the control step motor by reading described Stepping Motor Control curve, and the at the uniform velocity control section in described static control section, after slowing down and accelerate after postpone the beginning data acquisition through default after at the uniform velocity control section begins;
Described first buffer circuit is connected with described programming device, is used for the electric isolation between the described programming device of realization and the described stepper motor driver;
Described communication interface circuit is connected with described programming device, is used for the communication between the described programming device of realization and the described computing machine.
Disclosed herein as well is data acquisition and method for controlling stepping motor in a kind of quick XAFS experiment of implementing by aforesaid quick XAFS experimental system, comprise the steps:
Receive the required whole operational factors of quick XAFS experiment by the human-computer interaction interface of installing in the computing machine, to be transferred to intellectronics equipment after the described operational factor format, described intellectronics equipment stores described operational factor among the configuration RAM relevant with the stepper motor playback with energy scan that programming device carries into, and by programming device generation control curve, described control profile memory is in the control curved configuration RAM that described programming device carries;
When beginning to adopt spectrum, the existing angle of described double-crystal monochromator surveyed by shaft-position encoder and show and be transferred to described computing machine by display, and described programming device reads the control curve among the described control curved configuration RAM, and send gating pulse to stepper motor driver, rotate with the control step motor, thereby realize homogeneous X-ray scanning;
And when carrying out the step motor control step, described programming device constantly checks the current time, static control section in current time and described control curved configuration RAM in the pre-configured step motor control curve, when the difference between the start time of the at the uniform velocity control section after the at the uniform velocity control section after the deceleration or the acceleration reaches default the delay, the beginning data acquisition, thereby will store in the first in first out data buffer that described programming device carries corresponding to the signal of the described hyperchannel analog to digital conversion Acquisition Circuit output of different-energy point and/or to the count value that the pulse duration frequency signal of described electric voltage/frequency converter input is counted, form primary data;
Adopting spectrum when finishing, again the angle of described double-crystal monochromator is being surveyed by shaft-position encoder and shown and be transferred to described computing machine by display;
After adopting the spectrum end, primary data in the described first in first out data buffer is sent to computing machine, by the computer coordinates primary data, and according to adopting the value of composing the shaft-position encoder of obtaining when beginning and finishing, revise the energy calibration in the described primary data, the formal quick XAFS experimental data file of final generation, and the human-computer interaction interface in described computing machine is installed shows the quick XAFS spectrum of gathering.
The intellectronics equipment replacement that the application provides controllor for step-by-step motor in the conventional XAFS experimental system and scaler (if this intellectronics equipment does not comprise the device for the integration sampling scheme, then this intellectronics equipment can also replace the V/F converter), carry out Stepping Motor Control and data acquisition synchronously by the control curve of programming device reading pre-stored in RAM, realized fast synchronously, and then overcome in the prior art because the problem of adopting the spectrum limited speed that can't cause synchronously fast.
And, in RAM, be provided with the Stepping Motor Control curve in advance, this control area comprises be used to the at the uniform velocity control section after the static control section of carrying out data acquisition, the acceleration or the at the uniform velocity control section after slowing down, that is to say, stepper motor adopts the velocity of wave motion operation, low speed or static in carry out data acquisition, and at the interval high-speed cruising of non-data acquisition.Adopt this fluctuation rotation mode, the energy in the time of can reducing or eliminating rapid data collection moves Δ E, can obtain best the solution in sweeping spectrum speed and both contradiction of Δ E.
To describe in further detail among the embodiment later and adopt the application's embodiment how to solve each problem of mentioning in the background technology.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the application, feature and advantage will be more obvious by following.
Description of drawings
Fig. 1 has schematically shown a kind of structured flowchart of conventional XAFS experimental system;
Fig. 2 schematically shows a kind of structured flowchart of the QXAFS experimental system of the embodiment of the present application;
Fig. 3 has schematically shown the structured flowchart of the intellectronics equipment that is exclusively used in the QXAFS experiment in the embodiment of the present application;
Fig. 4 shows the analog data acquisition of intellectronics equipment in the embodiment of the present application and the logic diagram of integrated form data acquisition;
Fig. 5 has schematically shown the firmware of programming device (firmware) block diagram in the embodiment of the present application;
Fig. 6 schematically shows pre-configured a kind of control curve in RAM;
Fig. 7 schematically shows pre-configured another kind control curve in RAM;
Fig. 8 schematically shows pre-configured another kind control curve in RAM;
Fig. 9 schematically shows a kind of default set-up mode that postpones in the curve of controlling;
Figure 10 schematically shows the stagewise configuration synoptic diagram among the RAM;
Figure 11 schematically shows among the RAM for the configuration schematic diagram of controlling curve;
Figure 12 has schematically shown the another kind of structured flowchart of QXAFS experimental system in the embodiment of the present application;
Figure 13 schematically shows the structural representation of the another kind of intellectronics equipment of the embodiment of the present application;
Figure 14 has schematically shown the K space Cu(copper that the system that adopts as shown in Figure 2 obtains) the K limit EXAFS of K limit EXAFS spectrum and the Cu of the standard of gathering from the conventional XAFS method of the online database issue of United States advanced synchrotron radiation light source (APS) the comparison effect between composing.
Embodiment
Fig. 2 schematically shows the structured flowchart of the QXAFS experimental system of the embodiment of the present application.Synchrotron radiation X-ray incides on the double-crystal monochromator 101, and the ionization chamber detector 103(after the monoenergetic X ray of double-crystal monochromator 101 monochromatizations enters ionization chamber detector 103, the sample before being positioned at sample and is positioned at sample detection criterion sample simultaneously can also have the 3rd ionization chamber X-ray detector).
The current angle of double-crystal monochromator 101 can be surveyed and shown and be transferred to computing machine 108 by display 110 by shaft-position encoder 109.
The rolling the angle, throw the angle and driven by linear motor driver 112 of double-crystal monochromator 101, linear motor driver 112 is connected with computing machine 108, can realize manual control.
At least two current amplifiers of weak current signal feed-in 105 of ionization chamber detector output, the duty of current amplifier can be arranged by gpib bus by computing machine 108.
The spectrum data of adopting after data acquisition finishes transfer to computing machine 108 by intellectronics equipment 200.
Comparison diagram 2 and Fig. 1 as can be seen, the QXAFS experimental system of the embodiment of the present application is with the difference part of conventional XAFS experimental system: replaced controllor for step-by-step motor 114 and scaler 107 in the conventional XAFS experimental system with intellectronics equipment 200.
Fig. 3 has schematically shown the structured flowchart of the intellectronics equipment 200 that is exclusively used in the QXAFS experiment in the embodiment of the present application.
This intellectronics equipment 200 comprises: hyperchannel analog to digital conversion (ADC) Acquisition Circuit 201, multichannel buffer circuit 202, programming device 203, first buffer circuit 204 and communication interface circuit 205.
Hyperchannel ADC Acquisition Circuit 201 is used for and will converts digital signal to from the analog voltage signal of at least two current amplifiers.The current signal amplification that the X ray intensity that at least two current amplifiers (for example, the current amplifier among Fig. 1 105) are used for producing with the X-ray detector of quick XAFS experiment and sample front and back be directly proportional also converts analog voltage signal to.
Fig. 4 shows the analog data acquisition of intellectronics equipment in the embodiment of the present application and the logic diagram of integrated form data acquisition.Hyperchannel ADC Acquisition Circuit 201 converts the analog voltage signal of current amplifier 105 to digital signal, programming device 203 in the data fifo buffer, is equivalent to the signal storage of hyperchannel ADC Acquisition Circuit 201 input to carry out data acquisition with the ADC form.Programming device 203 utilizes the counting module of self that the pulse duration frequency signal of V/F converter 106 inputs is counted, and count value is stored in the data fifo buffer, be equivalent to replace the function of scaler in the conventional XAFS system, and realized carrying out data acquisition with integrated form.These two kinds of data acquisition paths walk abreast, and do not disturb mutually.
Fig. 5 has schematically shown the firmware block diagram of programming device in the embodiment of the present application.For example, programming device is field programmable gate array (FPGA), and the logic of this FPGA mainly can be made of 3 configuration RAM, some register (not shown)s, 4 logic function modules and 6 data fifo buffers etc.The signal that all italics mark among the figure can be by the register setting; The signal that all boldface types mark can be read by register.Can carry out communication by the ECS interface between each logic function module, RAM, the FIFO.
Energy scan process and playback process are fully by 3 configuration RAM definition.
(1) control curved configuration RAM: the Stepping Motor Control curve comprises acceleration curve and deceleration curve etc., and acceleration curve and deceleration curve can be regarded two opposite processes as, and employed pulse train is identical, when just accelerating, pulsed frequency increases progressively, and during deceleration, pulsed frequency is successively decreased.Therefore, acceleration and deceleration curves is used same RAM configuration.
(2) energy scan configuration RAM: the operational process of this RAM definition energy scan control module.
(3) playback control module operation configuration RAM: the operational process of this RAM definition stepper motor playback.
Register can be divided into two classes: control register and status register are respectively applied to control and the supervision of intellectronics equipment.Such as, by the step motor control register, can send energy scan operation request.
4 logic function modules realize the collection of Stepping Motor Control and data.
(1) energy scan control module
The energy scan control module can be visited energy scan configuration RAM and control curved configuration RAM, configuration according to two RAM, finish the acceleration and deceleration control to stepper motor, and send the data acquisition request at low speed or quiescent phase, thereby finish the process of energy scan.
The energy scan control module can start by write control register.
(2) playback control module
The playback control module can be visited playback control module operation configuration RAM and control curved configuration RAM, according to the configuration of two RAM, finishes the acceleration and deceleration control to stepper motor, makes stepper motor get back to reference position.
The playback control module can start by write control register.
(3) stepper motor pulse modulation module
The effect of stepper motor pulse modulation module comprises: stretched pulse signal, control step motor drive direction signal, to the stepper motor pulse count signal, detect the stepper motor step-by-step counting and whether exceed restriction etc.
When the stepper motor pulse modulation module detects stepper motor step-by-step counting overrun error; can stop the operation of stepper motor; shield; that is to say; if energy scan control module or playback control module are moved when detecting overrun error, operational process can be stopped immediately so.
(4) data acquisition module
The data acquisition request that data acquisition module received energy scan control module is sent, and can adopt according to number and postpone and number is adopted width and carried out data acquisition.After data acquisition was finished, collection result deposited in for data cached data fifo buffer, got for computing machine is machine-readable.This data acquisition module has counting module, can count for the pulse duration frequency signal that the V/F converter sends.
Above-mentioned 4 modules, each has basic error detection function, and all error messages can be inquired about by register.
6 data fifo buffers are used for the result of data cached collection, respectively corresponding 3 aanalogvoltage acquisition channels and 3 V/F step-by-step counting passages.
In the control curved configuration RAM that programming device carries, be provided with the Stepping Motor Control curve in advance.The different control sections of stepper motor and the relation between the Stepping Motor Control pulsed frequency when this control curve definitions carries out data acquisition at the different-energy point.These different control sections comprise static control section, the at the uniform velocity control section after the deceleration or the at the uniform velocity control section after the acceleration and the acceleration control section of not carrying out data acquisition that allows data acquisition.
Fig. 6 schematically shows pre-configured a kind of control curve in RAM.In this control curve, horizontal ordinate t represents the working time of stepper motor, and ordinate fs represents the Stepping Motor Control pulsed frequency.The speed of stepper motor and gating pulse frequency dependence, when stepper motor accelerates, the gating pulse frequency increments; When stepper motor slowed down, the gating pulse frequency was successively decreased.
The corresponding different control sections of single energy point (i.e. a monoenergetic energy point that obtains by double-crystal monochromator, for example first energy point) comprise the at the uniform velocity control section after the deceleration that allows data acquisition and the acceleration control section of not carrying out data acquisition.
The acceleration control section of not carrying out data acquisition comes down to a High-speed Control section, in this control section stepper motor is accelerated, and makes that stepper motor accelerates to turn to required angle, and then obtains required monoenergetic X ray.
At the uniform velocity control section and deceleration control section after after through the acceleration control section, can acceleration being arranged.At the uniform velocity control section after after the deceleration control section, entering deceleration.At the uniform velocity control section after this deceleration is a low speed control section, carries out data acquisition in control section, and the energy that can reduce the monoenergetic X ray moves, and adopts the spectrum quality thereby improve.
As seen, come the control step motor by control curve shown in Figure 6, can so that stepper motor circulation do accelerate operation, travel at the uniform speed (high-speed cruising) after accelerating, travel at the uniform speed (slow running) after running slowly, slowing down, realized " fluctuation formula " operation control of stepper motor.
One of key point in the solution that the problem that the application exists at prior art proposes is exactly to allow stepping motor " fluctuation formula " operation, namely allow stepping motor quick rotation in the stage of not carrying out data acquisition, and allow the stepping motor slowly run in the stage of carrying out data acquisition.Like this, can allow stepping motor quick rotation to the desired position on the one hand, reach purpose fast, when carrying out data acquisition, allow the stepping motor with slow running on the other hand, the energy that reduces the monoenergetic X ray moves, and improves the signal to noise ratio (S/N ratio) of system, guarantees to adopt the spectrum quality.
Fig. 7 schematically shows pre-configured another kind control curve in RAM.In this control curve, horizontal ordinate t represents the working time of stepper motor, and ordinate fs represents the Stepping Motor Control pulsed frequency.
Among Fig. 7, the different control sections of single energy point correspondence comprise the static control section that allows data acquisition and the acceleration control section of not carrying out data acquisition.
The acceleration control section of not carrying out data acquisition comes down to a High-speed Control section, in this control section stepper motor is accelerated, and makes that stepper motor accelerates to turn to required angle, and then obtains required monoenergetic X ray.
At the uniform velocity control section and deceleration control section after after through the acceleration control section, can acceleration being arranged.After the deceleration control section, enter static control section.Carry out data acquisition in static control section, the energy that can reduce the monoenergetic X ray moves, and adopts the spectrum quality thereby improve.
As seen, come the control step motor by control curve shown in Figure 7, can so that stepper motor circulation do accelerate operation, travel at the uniform speed (high-speed cruising) after accelerating, run slowly, static, realized " fluctuation formula " operation control of stepper motor.
In Fig. 6 and control curve shown in Figure 7, the process of quick start-stop control and traditional XAFS experimental system are similar, but owing to allow data acquisition in low speed control section or static control section, thereby make the quick start-stop of stepper motor process can with the process high level of synchronization of data acquisition, therefore, compare with traditional XAFS experimental system, the application's embodiment can adopt under the prerequisite of composing quality in assurance and finish data acquisition with less time.
Fig. 8 schematically shows pre-configured another kind control curve in RAM.In this control curve, horizontal ordinate t represents the working time of stepper motor, and ordinate fs represents the Stepping Motor Control pulsed frequency.
The different control sections of single energy point correspondence comprise the at the uniform velocity control section after the acceleration that allows data acquisition and the acceleration control section of not carrying out data acquisition.
In the curve shown in Figure 8, in the process of stepper motor high-speed cruising, finish data acquisition.Adopt this control curve to come the control step motor, because stepper motor runs up in the data acquisition, thereby, the energy of monoenergetic X ray moves big slightly, yet, owing to the at the uniform velocity control section after acceleration allows to carry out data acquisition, thereby realized the high-speed synchronous of step motor control and data acquisition, thereby, compare with the XAFS experimental system of routine and still to have advantage fast.
At Fig. 6 in control curve shown in Figure 8, can arrange between the valid data acquisition zone of each energy point correspondence, that is to say in the at the uniform velocity control section after static control section, the deceleration or after the beginnings such as at the uniform velocity control section after accelerating to begin data acquisition through default delay.For example, Fig. 9 schematically shows a kind of default set-up mode that postpones in the curve of controlling.In Fig. 9, through after the default delay Td, begin to carry out data acquisition after the at the uniform velocity control section after deceleration (the being low speed segment) beginning.The time that continues between the valid data acquisition zone is Ts.
In the application's embodiment, segmentation control is adopted in the control of stepper motor and data acquisition.Once adopt the spectrum process and comprise a plurality of control sections.This control section can have polytype, for example arrive shown in the control curve of Fig. 8 as Fig. 6, can comprise the one-step control section, accelerate control section, at the uniform velocity control section, deceleration control section, static control section etc., be used for respectively that the control step motor moves a step, stepper motor accelerates, stepper motor travels at the uniform speed, stepper motor slows down, stepper motor transfixion etc.The RAM storage of once adopting control curved configuration RAM that a plurality of control sections that the spectrum process comprises can carry by programming device or can directly be visited by programming device.Figure 10 schematically shows the stagewise configuration synoptic diagram among the RAM.Disposed among this control curved configuration RAM control section 1, control section 2 ... control section N, each control section all can dispose the time T s that continues between effective data collection zone and the default delay Td that begins data acquisition.
In fact the acceleration and deceleration process of stepper motor can be finished by sending the step motor control pulse signal at interval according to a series of predetermined times.The control curved configuration RAM that this a series of time interval can be carried by programming device or can be by the directly RAM storage of visit of programming device.Figure 11 schematically shows among the RAM for the configuration schematic diagram of controlling curve.In this RAM, disposed the recurrence interval of each pulsed frequency correspondence.The inverse in the time interval that these are a series of is the frequency of a series of control waves that will produce.During acceleration, it is big that the frequency of this series of pulses becomes, and during deceleration, the frequency of pulse diminishes.
The time interval of a series of pulses of acceleration and moderating process is calculated in advance by computing machine or programming device, and writes among the control curved configuration RAM.Utilize the time interval of storing among the control curved configuration RAM also can decelerate to stationary state to stepper motor from highest running speed stepper motor from the static highest running speed that accelerates to stepper motor.Certainly, can realize that also any one speed is to acceleration or the moderating process of another one speed.
Accelerate control section and can be all or part of of the acceleration curve preserved among the control curved configuration RAM, specifically can be determined by the starting velocity of accelerating the control section appointment and end speed.Starting velocity and end speed have determined commencing speed and the end speed of accelerator.
The deceleration control section is similar with the acceleration control section, only is used for realizing the process of one section deceleration conversely.
Accelerate and deceleration curve can be calculated according to the structure of parameter such as the moment of torsion of stepper motor, rotating speed and gearing and load by computing machine and provides, and write among the RAM that programming device carries.
In order to make that operation and the data acquisition of stepper motor can be synchronous, in the acceleration control section of control step motor operating state, at the uniform velocity control section, deceleration control section and static control section can allow the log-on data collection.Certainly these control sections also can the forbidden data collection, specifically can be determined by the definition of control section.Preferably, monoenergetic X ray energy excursion is bigger when data acquisition occurring, can at the uniform velocity control section and static control section after deceleration allow the log-on data collection.And accelerating the collection of control section forbidden data.
For the control section of having opened data acquisition function, can define between the execution zero-time of control section and the zero-time of data acquisition one time delay Td, as shown in Figure 9.
Intellectronics equipment shown in Figure 3 comprises hyperchannel ADC Acquisition Circuit 201 and can count by programming device 203 paired pulses frequency signals, thereby can carry out adc data sampling and these two kinds of data sampling modes of integration sampling.Certainly, this equipment also can possess a kind of in ADC sampling and these two kinds of sample modes of integration sampling.Figure 12 has schematically shown the another kind of structured flowchart of QXAFS experimental system in the embodiment of the present application.This structure is compared with structure shown in Figure 2, has saved the V/F converter, namely is equivalent to intellectronics equipment 200 and has replaced controllor for step-by-step motor, scaler and V/F converter in the conventional XAFS system.Correspondingly, in intellectronics equipment 200, can not comprise the hyperchannel buffer circuit.Structure shown in Figure 12 only can realize the ADC sample mode.
, intellectronics equipment 200 paired pulses frequency signals do not comprise hyperchannel ADC Acquisition Circuit 201 if counting, then can not dispense the V/F converter in the system shown in Figure 2, namely be equivalent to intellectronics equipment and replaced controllor for step-by-step motor and scaler in the conventional XAFS system.
The course of work of the application's QXAFS experimental system is described to Figure 12 below in conjunction with Fig. 2.
Before beginning QXAFS experiment, relevant overhead control program is installed (for example in the computing machine, this overhead control program can realize by Labview), whole operational factors of spectrum are adopted in the human-computer interaction interface input of user by the overhead control program, and format is passed to intellectronics equipment under the back.This intellectronics equipment with operational factor be stored in the configuration RAM(relevant with the stepper motor playback with energy scan that this programming device carries for example energy scan configuration RAM and the playback among Fig. 5 move RAM) in, and by programming device generation control curve, this control profile memory is in the control curved configuration RAM that programming device carries.
Carrying out to carry out prescan before the QXAFS experiment, allow the size of user at K space observation white noise, by the noise size of observing the K space and the lasting time of factor specified data collections such as statistical error that allows in conjunction with light intensity, sample state and analysis data, be the size of the Ts among Fig. 9, and the size of determined Ts is input to intellectronics equipment.This intellectronics equipment can form based on the size of the Ts of user input and adopt spectrum planning, i.e. a plurality of control curves of stepper motor.
When beginning to adopt spectrum, the existing angle of double-crystal monochromator surveyed by shaft-position encoder and show and be transferred to computing machine by display, and programming device reads the control curve among the control curved configuration RAM, and send gating pulse to stepper motor driver, rotate with the control step motor, thereby realize homogeneous X-ray scanning.
And when carrying out the step motor control step, programming device constantly checks the current time, in current time and the static control section of controlling in the step motor control curve pre-configured among the curved configuration RAM, when the difference between the start time of the at the uniform velocity control section after the at the uniform velocity control section after the deceleration or the acceleration reaches default the delay, the beginning data acquisition, thereby will store in the first in first out data buffer that programming device carries corresponding to the signal of the hyperchannel analog to digital conversion Acquisition Circuit of different-energy point output and/or to the count value that the pulse duration frequency signal of electric voltage/frequency converter input is counted, form primary data.
Adopting spectrum when finishing, again the angle of double-crystal monochromator is being surveyed by shaft-position encoder and shown and be transferred to computing machine by display.
After adopting the spectrum end, primary data in the data fifo buffer is sent to computing machine, by the computer coordinates primary data, and according to adopting the value of composing the shaft-position encoder of obtaining when beginning and finishing, revise the energy calibration in the primary data, the formal quick XAFS experimental data file of final generation, and the human-computer interaction interface of installing in computing machine shows the quick XAFS spectrum of gathering.
It is noted that especially among the application's the embodiment that above-mentioned step motor control step and data acquisition step are carried out simultaneously, by the intellectronics equipment based on programming device, can realize between these two steps fast synchronously.
In the application's embodiment, the ADC port number that hyperchannel ADC Acquisition Circuit comprises can be no less than 2 passages, and analog to digital conversion is gathered figure place can be not less than 10.The multichannel buffer circuit can be optics buffer circuit or magnetic buffer circuit.Figure 13 schematically shows the structural representation of the another kind of intellectronics equipment of the embodiment of the present application.In this equipment, hyperchannel ADC Acquisition Circuit 201 comprises three ADC acquisition channel 201a, and multiplex optical buffer circuit 202 comprises three road optics buffer circuit 202a.
In each embodiment of the application, the communication interface circuit that is connected with programming device can be USB interface, network interface, serial ports, wave point etc.Multichannel buffer circuit and first buffer circuit can be optics buffer circuit or magnetic buffer circuit.Programming device can be a kind of in field programmable gate array (FPGA), microprocessor (MPU), microcontroller (MCU) and the digital signal processor (DSP).
Intellectronics equipment, QXAFS experimental system and corresponding data acquisition that what adopts the embodiment of the present application to provide and method for controlling stepping motor are provided below just can solve problem (1) that prior art that preamble mentions exists to (7).
1, in the intellectronics equipment that the application provides, the counting of pulse duration frequency signal is realized by programming device, and no longer realized by discrete scaler, Stepping Motor Control is realized by programming device, and no longer realized by discrete controllor for step-by-step motor, that is to say, the intellectronics equipment replacement that the application provides controllor for step-by-step motor and the scaler in the conventional XAFS experimental system.Like this, carry out Stepping Motor Control and data acquisition synchronously by the control curve of programming device reading pre-stored in RAM, solid line fast synchronously, and then overcome in the prior art because the problem (1) of adopting the spectrum limited speed that can't cause synchronously fast.
2, in the application's embodiment, in RAM, be provided with the Stepping Motor Control curve in advance, this control curve comprises be used to the static control section of carrying out data acquisition or the at the uniform velocity control section after slowing down, that is to say, stepper motor adopts the velocity of wave motion operation, low speed or static in carry out data acquisition, and at the interval high-speed cruising of non-data acquisition.Adopt this fluctuation rotation mode, the energy in the time of can reducing or eliminating rapid data collection moves Δ E, can obtain best solution in sweeping spectrum speed and both contradiction of Δ E, thereby has solved the problem (2) that influences QXAFS quality of data factor.
3, reach the setting of relevant analytical procedure by main frame prescan program, at the beginning of beginning to adopt spectrum, pass through prescan, allow the size of user at K space observation white noise, by the noise size in observation K space and in conjunction with light intensity, sample state and the lasting time of factor specified data collections such as statistical error of analyzing the data permission, determined fast at the minimal sampling time t(that guarantees each energy point under the prerequisite of the quality of data namely, the duration T s of the data acquisition among Fig. 7), and then optimized and adopted spectrum speed, solved the problem (3) that influences QXAFS quality of data factor.
4, an embodiment according to the application, in intellectronics equipment, can realize data acquisition with the ADC sampling plan by hyperchannel ADC Acquisition Circuit, and can count by the integration scheme by programming device paired pulses frequency signal and realize data acquisition, that is to say, this intellectronics equipment provides two kinds of data acquisition modes, thereby, for further comparing the quality of different data acquisition circuit arrangement, for adopting different improvement detector system hardware that dirigibility is provided under the different experimental conditions, the problem (4) and (5) that influence QXAFS quality of data factor have been solved.
5, the application's intellectronics equipment is realized Stepping Motor Control and data acquisition based on programming device, have high execution and timing accuracy, the phase place of stepping and sampling is accurate in having guaranteed to scan, and has solved the problem (6) that influences QXAFS quality of data factor.
6, the intelligent terminal electron that provides of the application is learned equipment centralized procurement sample, stepper drive in one, overcome the time overhead of many equipment rooms signal transmission in the conventional XAFS system, conversion, main frame computing, improve entire system to greatest extent and adopted spectrum speed, solved the problem (7) that influences QXAFS quality of data factor.
Figure 14 has schematically shown the K space Cu(copper that the system that adopts as shown in Figure 2 obtains) the K limit expansion XAFS(extend X-ray Absorption Fine Structure of K limit EXAFS spectrum and the Cu of the standard of gathering from the conventional XAFS method of the online database issue of United States advanced synchrotron radiation light source (APS), EXAFS) the comparison effect between the spectrum, sample is 5 microns standard Copper Foil.Solid black lines is represented the K limit EXAFS spectrum of the Cu of standard among Figure 14, and the grey solid line is represented the K limit EXAFS spectrum of the Cu that the system by as shown in Figure 2 obtains.Found out that by these two curve ratio two spectrums are coincide finely at 12K with interior, only are 15 seconds and adopt the spectrum time, show that the QXAFS system that uses the application can have higher adopting and compose quality and the very fast spectrum speed of adopting in the K space.
Need to prove, the QXAFS experimental system that the application provides is not limited to shaft-position encoder, display, linear motor driver among Fig. 2 etc. and establishes structure, those skilled in the art can design other structure, the application's the intellectronics equipment that focuses on and the assembly that is associated with this intellectronics equipment.
Though described the application with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from invention because the application can specifically implement in a variety of forms, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and should be in the spirit and scope that the claim of enclosing limits explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (10)
1. intellectronics equipment that is exclusively used in quick XAFS experiment comprises: in hyperchannel analog to digital conversion Acquisition Circuit and the multichannel buffer circuit one of at least, programming device, first buffer circuit and communication interface circuit:
Described hyperchannel analog to digital conversion Acquisition Circuit is used for and will converts digital signal to from the analog voltage signal of at least two current amplifiers, and the current signal amplification that the X ray intensity that described at least two current amplifiers are used for producing with the X-ray detector of quick XAFS experiment and sample front and back be directly proportional also converts analog voltage signal to;
The multichannel buffer circuit is used for realizing from the pulse duration frequency signal of electric voltage/frequency converter and the electric isolation between the described programming device that described electric voltage/frequency converter is used for converting the analog voltage signal of described at least two current amplifiers to pulse duration frequency signal;
Programming device is connected with described multichannel buffer circuit with described hyperchannel analog to digital conversion Acquisition Circuit, be used for receiving the signal of described hyperchannel analog to digital conversion Acquisition Circuit output, pulse duration frequency signal to described electric voltage/frequency converter input is counted, and store in the first in first out data buffer that described programming device carries with the signal of described hyperchannel analog to digital conversion Acquisition Circuit output with to the count value that the pulse duration frequency signal of described electric voltage/frequency converter input is counted, read for computing machine;
In the control curved configuration RAM that described programming device carries, be provided with the Stepping Motor Control curve in advance, the different control sections of stepper motor and the relation between the Stepping Motor Control pulsed frequency when described control curve definitions carries out data acquisition at the different-energy point, described different control sections comprise static control section, the at the uniform velocity control section after the deceleration or the at the uniform velocity control section after the acceleration and the acceleration control section of not carrying out data acquisition that allows data acquisition;
Described programming device is used for sending gating pulse to stepper motor driver and rotating with the control step motor by reading described Stepping Motor Control curve, and the at the uniform velocity control section in described static control section, after slowing down and accelerate after postpone the beginning data acquisition through default after at the uniform velocity control section begins;
Described first buffer circuit is connected with described programming device, is used for the electric isolation between the described programming device of realization and the described stepper motor driver;
Described communication interface circuit is connected with described programming device, is used for the communication between the described programming device of realization and the described computing machine.
2. intellectronics equipment according to claim 1, wherein, described programming device is a kind of in field programmable gate array, microprocessor, microcontroller and the digital signal processor.
3. intellectronics equipment according to claim 1, wherein, the different control sections of single energy point correspondence comprise the static control section that allows data acquisition and the acceleration control section of not carrying out data acquisition.
4. intellectronics equipment according to claim 1, wherein, the different control sections of single energy point correspondence comprise the at the uniform velocity control section after the deceleration that allows data acquisition and the acceleration control section of not carrying out data acquisition.
5. intellectronics equipment according to claim 1, wherein, the analog to digital conversion port number that described hyperchannel analog to digital conversion Acquisition Circuit comprises is no less than 2 passages, and analog to digital conversion is gathered figure place and is not less than 10.
6. intellectronics equipment according to claim 1, wherein, described multichannel buffer circuit is optics buffer circuit or magnetic buffer circuit.
7. quick XAFS experimental system comprises:
The synchrotron radiation X-ray source;
Double-crystal monochromator is with the X ray monochromatization of described synchrotron radiation X-ray source output, to obtain the required monoenergetic X ray of quick XAFS experiment;
Shaft-position encoder is for the angle of surveying described double-crystal monochromator;
Stepper motor is used for the described double-crystal monochromator of control and rotates;
Stepper motor driver electrically connects with described stepper motor, is used for driving described stepper motor and rotates;
At least two current amplifiers, the current signal amplification that the X ray intensity that produces for the X-ray detector with quick XAFS experiment and sample front and back is directly proportional also converts analog voltage signal to;
Electric voltage/frequency converter is connected with described two current amplifiers at least, is used for converting the analog voltage signal of described at least two current amplifiers to pulse duration frequency signal;
Computing machine be used for to receive the angle of the described double-crystal monochromator that described shaft-position encoder detects; And
Intellectronics equipment comprises: in hyperchannel analog to digital conversion Acquisition Circuit and the multichannel buffer circuit one of at least, programming device, first buffer circuit and communication interface circuit:
Described hyperchannel analog to digital conversion Acquisition Circuit and described at least two current amplifiers electrically connect, and are used for and will convert digital signal to from the analog voltage signal of at least two current amplifiers;
The multichannel buffer circuit is disposed between described electric voltage/frequency converter and the described programming device, is used for realizing from the pulse duration frequency signal of described electric voltage/frequency converter and the electric isolation between the described programming device;
Programming device is connected with described multichannel buffer circuit with described hyperchannel analog to digital conversion Acquisition Circuit, be used for receiving the signal of described hyperchannel analog to digital conversion Acquisition Circuit output, pulse duration frequency signal to described electric voltage/frequency converter input is counted, and store in the first in first out data buffer that described programming device carries with the signal of described hyperchannel analog to digital conversion Acquisition Circuit output with to the count value that the pulse duration frequency signal of described at least two electric voltage/frequency converters input is counted, read for described computing machine;
In the control curved configuration RAM that described programming device carries, be provided with the Stepping Motor Control curve in advance, the different control sections of stepper motor and the relation between the Stepping Motor Control pulsed frequency when described control curve definitions carries out data acquisition at the different-energy point, described different control sections comprise static control section, the at the uniform velocity control section after the deceleration or the at the uniform velocity control section after the acceleration and the acceleration control section of not carrying out data acquisition that allows data acquisition;
Described programming device is used for sending gating pulse to described stepper motor driver and rotating with the control step motor by reading described Stepping Motor Control curve, and the at the uniform velocity control section in described static control section, after slowing down and accelerate after postpone the beginning data acquisition through default after at the uniform velocity control section begins;
Described first buffer circuit is connected with described programming device, is used for the electric isolation between the described programming device of realization and the described stepper motor driver;
Described communication interface circuit is connected with described programming device, is used for the communication between the described programming device of realization and the described computing machine.
8. system according to claim 7, wherein, described programming device is a kind of in field programmable gate array, microprocessor, microcontroller and the digital signal processor.
9. data acquisition and method for controlling stepping motor during a quick XAFS who implements by claim 7 or 8 described quick XAFS experimental systems tests comprise the steps:
Receive the required whole operational factors of quick XAFS experiment by the human-computer interaction interface of installing in the computing machine, to be transferred to intellectronics equipment after the described operational factor format, described intellectronics equipment stores described operational factor among the configuration RAM relevant with the stepper motor playback with energy scan that programming device carries into, and by programming device generation control curve, described control profile memory is in the control curved configuration RAM that described programming device carries;
When beginning to adopt spectrum, the existing angle of described double-crystal monochromator surveyed by shaft-position encoder and show and be transferred to described computing machine by display, and described programming device reads the control curve among the described control curved configuration RAM, and send gating pulse to stepper motor driver, rotate with the control step motor, thereby realize homogeneous X-ray scanning;
And when carrying out the step motor control step, described programming device constantly checks the current time, static control section in current time and described control curved configuration RAM in the pre-configured step motor control curve, when the difference between the start time of the at the uniform velocity control section after the at the uniform velocity control section after the deceleration or the acceleration reaches default the delay, the beginning data acquisition, thereby will store in the first in first out data buffer that described programming device carries corresponding to the signal of the described hyperchannel analog to digital conversion Acquisition Circuit output of different-energy point and/or to the count value that the pulse duration frequency signal of described electric voltage/frequency converter input is counted, form primary data;
Adopting spectrum when finishing, again the angle of described double-crystal monochromator is being surveyed by shaft-position encoder and shown and be transferred to described computing machine by display;
After adopting the spectrum end, primary data in the described first in first out data buffer is sent to computing machine, by the computer coordinates primary data, and according to adopting the value of composing the shaft-position encoder of obtaining when beginning and finishing, revise the energy calibration in the described primary data, the formal quick XAFS experimental data file of final generation, and the human-computer interaction interface of installing in described computing machine shows the quick XAFS spectrum of gathering.
10. method according to claim 9, wherein, the different control sections of single energy point correspondence comprise the static control section that allows data acquisition and the acceleration control section of not carrying out data acquisition; Perhaps
The different control sections of single energy point correspondence comprise the at the uniform velocity control section after the deceleration that allows data acquisition and the acceleration control section of not carrying out data acquisition.
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| CN112763432A (en) * | 2020-12-25 | 2021-05-07 | 中国科学院上海高等研究院 | Control method for automatically collecting absorption spectrum experimental data |
| CN113281361A (en) * | 2021-05-12 | 2021-08-20 | 中国科学院高能物理研究所 | Quick scanning XAFS system |
| CN113376189A (en) * | 2021-05-12 | 2021-09-10 | 中国科学院高能物理研究所 | QXAFS electronics equipment |
| CN113281361B (en) * | 2021-05-12 | 2022-12-02 | 中国科学院高能物理研究所 | Quick scanning XAFS system |
| CN117647745A (en) * | 2023-12-01 | 2024-03-05 | 青岛艾诺仪器有限公司 | Battery micro-short circuit data acquisition method based on annular buffer |
| CN117647745B (en) * | 2023-12-01 | 2024-05-07 | 青岛艾诺仪器有限公司 | Battery micro-short circuit data acquisition method based on annular buffer |
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