CN208443916U - A kind of data acquisition device - Google Patents
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- CN208443916U CN208443916U CN201821049814.4U CN201821049814U CN208443916U CN 208443916 U CN208443916 U CN 208443916U CN 201821049814 U CN201821049814 U CN 201821049814U CN 208443916 U CN208443916 U CN 208443916U
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Abstract
The utility model discloses a kind of data acquisition devices, it include: cabinet, the display interactive unit that case front panel is set, the computer that the communication interface of cabinet rear panel is set and is arranged in outside cabinet, cabinet inside is provided with N number of weak current signal amplification unit, N number of voltage to frequency convert unit and centralized control unit, display interactive unit includes N number of voltage display table and interaction subelement, wherein, there are one-to-one relationships between N number of weak current signal amplification unit, N number of voltage to frequency convert unit and N number of voltage display table；The output end of weak current signal amplification unit is separately connected corresponding voltage to frequency convert unit, corresponding voltage display table, and the output end of N number of voltage to frequency convert unit is connected with centralized control unit；Centralized control unit is connected with N number of weak current signal amplification unit respectively, is connected with subelement is interacted；Centralized control unit is connected to a computer by the communication interface.
Description
Technical field
The utility model relates to weak current detection technology field more particularly to a kind of data acquisition devices.
Background technique
Weak current measuring technology is widely used in X-ray detection field.In the application of weak current signal data acquisition, when
When measuring physical quantity has statistic fluctuation characteristic, it is accurate that weak current signal is generally obtained by the processing method of time integral
Measured value.
Inventor has found in the process of implementing the utility model, current general weak current signal data acquisition system
Basic framework is that signal output low current signal, the output voltage after low current amplifier amplifies are obtained by X-ray detector
Signal, then converted via voltage to frequency converter, host computer is inputted after the processing of multiple metering device.However, above-mentioned each group
It is expensive at being all partially discrete special instrument, and data collection system complexity of its composition is huge, operation and maintenance all need
Expend a large amount of cost.In addition, also being deposited when the amplification factor of low current amplifier and the light current flow stage of input mismatch
The measuring error the problem of.
Summary of the invention
The purpose of this utility model is to provide a kind of data acquisition devices, above-mentioned existing in the prior art to solve
The data of problem, especially synchrotron radiation X-ray absorption experiments system acquire.
The utility model is implemented by following technical solution:
The utility model provides a kind of data acquisition device, comprising: cabinet, the display that the case front panel is arranged in
Interactive unit, the communication interface that the cabinet rear panel is arranged in and the computer being arranged in outside the cabinet, feature exist
In:
The cabinet inside is provided with N number of weak current signal amplification unit, N number of voltage to frequency convert unit and center control
Unit, the display interactive unit include N number of voltage display table and interaction subelement, wherein N is the positive integer greater than 1, N number of
The weak current signal amplification unit, N number of voltage to frequency convert unit and N number of voltage, which are shown between table, to be existed one by one
Corresponding relationship；The output end of the weak current signal amplification unit is separately connected the corresponding voltage to frequency convert list
First, the corresponding voltage shows that table, the output end of N number of voltage to frequency convert unit control with the center single
Member is connected；The centralized control unit is connected with N number of weak current signal amplification unit respectively by internal bus, is led to
Internal signal line is crossed to be connected with the subelement that interacts；The centralized control unit passes through the communication interface and the meter
Calculation machine is connected.
Further, the interactive subelement includes switching push button and control model display lamp, and the switching push button includes
Control mode switch button and amplification factor switching push button.
Further, the centralized control unit is provided with monitoring modular, the output of N number of voltage to frequency convert unit
End is connected with the monitoring modular, and the monitoring modular is used to the data monitored being transmitted to the computer.
Further, the centralized control unit is provided with encoding setting module and coding output module, and the coding is set
Module is set to be connected with the output end of the output end of the control mode switch button and the amplification factor switching push button respectively,
The encoding setting module is connected with the input terminal of the control model display lamp and the coding output module respectively, described
The output end of coding output module is connected with N number of weak current signal amplification unit respectively.
Further, the centralized control unit is additionally provided with N number of counting module, N number of data cache module and communication mould
Block, there are an a pair between N number of data cache module, N number of counting module and N number of voltage to frequency convert unit
It should be related to, the voltage to frequency convert unit connects the corresponding counting module, and the counting module connection is right with it
The data cache module answered, the data cache module is connected with the communication module, the communication module and institute
Communication interface is stated to be connected.
Further, the communication module is connected with the encoding setting module.
Further, the monitoring modular is connected with the communication module, and the data is made to pass through the communication module
It is transmitted to the computer.
Further, N number of weak current signal amplification unit and N number of voltage to frequency convert unit are fixed on described
The bottom plate of cabinet, the centralized control unit are perpendicularly fixed at the rear panel on the inside of the cabinet.
Further, the input terminal of the weak current signal amplification unit is connected with X-ray detector.
It, will be weak in the prior art by above technical scheme as it can be seen that data acquisition device provided by the embodiment of the utility model
Each discrete special equipment function is integrated in same cabinet in current signal data collection system, so that data acquisition device
Integrated level is high, maintenance is simple；Meanwhile data acquisition efficiency and dress are improved including multi-channel data acquisition channel in the device
Set speed, the reliability and stability of operation；In addition, the device can be amplified again simultaneously by display panel and computer
Several controls and monitors, and avoids the occurrence of the unmatched situation of light current flow stage of amplification factor and input.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is data acquisition device structural schematic diagram provided by the utility model embodiment；
Fig. 2 is data acquisition device concrete structure schematic diagram provided by the utility model embodiment；
Fig. 3 is the layout of data acquisition device provided by the utility model embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
The term used in the utility model embodiment and is not intended to merely for for the purpose of describing particular embodiments
Limit the utility model.The utility model embodiment and the "an" of singular used in the attached claims,
" described " and "the" are also intended to including most forms, unless the context clearly indicates other meaning.
The technical solution of the utility model embodiment is described in detail below.
Fig. 1, Fig. 2 are data acquisition device structural schematic diagram provided by the embodiment of the utility model.As shown in Figure 1 and Figure 2,
The data acquisition device includes: cabinet 1, the display interactive unit 10 that 1 front panel of cabinet is arranged in, is arranged behind cabinet 1
The communication interface 60 of plate and the computer 50 being arranged in outside cabinet 1.It is single that cabinet 1 is internally provided with N number of weak current signal amplification
Member 20, N number of voltage to frequency convert unit 30 and centralized control unit 40, display interactive unit 10 include that N number of voltage shows table 110
With interaction subelement 120, wherein N is the positive integer greater than 1, N number of weak current signal amplification unit 20, N number of voltage to frequency convert
There are one-to-one relationships between unit 30 and N number of voltage display table 110.Preferably, in practical applications, N can for 2 or
3。
The output end of weak current signal amplification unit 20 is separately connected corresponding voltage to frequency convert unit 30 and electricity
Pressure display table 110, the output end of the voltage to frequency convert unit 30 in N number of data acquisition channel with 40 phase of centralized control unit
Connection.
Centralized control unit 40 is amplified with the weak current signal in each data acquisition channel single respectively by internal bus
Member 20 is connected, and is connected by internal signal line with subelement 120 is interacted.Centralized control unit 40 passes through communication interface 60
It is connected with computer 50, communication interface 60 can be USB interface, be also possible to wireless interface, be made by communication interface 60
The data acquisition device can connect with computer 50 and be communicated.
Specifically, weak current signal amplification unit 20 is made of trans-impedance amplifier, gain amplifier and gain control circuit,
For amplifying low current signal, and it is converted into voltage signal, avoids the interference by spatial electromagnetic wave.Optionally,
The input terminal of weak current signal amplification unit 20 is connected with X-ray detector, accesses it and measures obtained weak current signal.?
In the present embodiment, the detection range of weak current signal amplification unit 20 can achieve 100pA-1mA, different magnitude of input light current
The corresponding different amplification factor of stream, so that the voltage signal of output is controlled in 0-10V, detectivity can achieve 1pA.
In addition, the integrated circuit of weak current signal amplification unit 20 can be placed in the shielding aluminum hull of pre-set dimension, with shielding space electricity
Magnetic wave interference, the size of aluminum hull size can be according to actually being set.
The voltage signal that weak current signal amplification unit 20 exports is transmitted to corresponding voltage to frequency convert unit 30
Input terminal.The input voltage is converted into corresponding frequency signal, the frequency signal of output by voltage to frequency convert unit 30
It is worth proportional to the voltage signal values of input.For example, when the voltage signal of input is 0~10V, the frequency signal of output is
0~5MHz, i.e. pulse frequency are proportional to voltage value.Voltage to frequency convert unit 30 can integrate the printed circuit in pre-set dimension
On plate, the size of circuit board size can be previously according to actually being set.
That is, the corresponding voltage to frequency convert unit 30 of each weak current signal amplification unit 20 constitutes list
Solely data acquisition channel, the corresponding voltage value of the collected weak current in the channel may be displayed on corresponding voltage display table all the way
On 110.The independent data acquisition channel in the road N is integrated in each data acquisition channel, in the present apparatus, to realize synchronization
The parallel acquisition of multichannel light current flow data.
Centralized control unit 40 is write using controlling chip field programmable gate array as core using VHDL language,
Its circuit can integrate on the printed circuit board of pre-set dimension.Centralized control unit 40 is logical for controlling each circuit-switched data acquisition
The coordinated operation in road, each functional unit, and communicated by communication interface and computer.In every circuit-switched data acquisition channel
Voltage to frequency convert unit 30 export frequency signal be transmitted to centralized control unit 40.
Since data acquisition device may be related to X-ray synchrotron radiation related experiment, for health of human body, can pass through
Computer 50 is remotely controlled.That is, the present apparatus can pass through computer 50 or the interaction any mode of subelement 120
Carry out the setting of the amplification factor of weak current amplifying unit 20.
Further, interaction subelement 120 includes switching push button 1210 and control model display lamp 1220, switching push button
1210 include control mode switch button and amplification factor switching push button, and the amplification factor switching push button can be 8 thumb wheels
Band switch is also possible to the switch that Qi Ta Eng can be realized amplification factor switching, and the utility model is it is not limited here.It is described
The output end of the output end of control mode switch button and the amplification factor switching push button respectively with 40 phase of centralized control unit
Connection, the input terminal of the control model display lamp 1220 are connected with centralized control unit 40.The control mode switch is pressed
Button is used to carry out the switching of control model, i.e. progress computer control (remote control) and interaction subelement control (manually controlling)
Switching, switching signal is transmitted to control model display lamp 1220 through centralized control unit 40, so that control model display lamp
1220 can show current control model.The amplification factor switching push button for carrying out Current amplifier times in a manual mode
Several switchings.
Two kinds of control models are specifically introduced below.
Specifically, experimenter can carry out the observation of voltage value by voltmeter 110.If it was found that the voltage one of voltmeter
Directly in 0.1V or so, illustrate the weak current relative to input, current amplification factor is too small, and amplification factor should suitably be turned up；Hair
The voltage of existing voltmeter illustrates the weak current relative to input always in 10V or so, and current amplification factor is excessive, should be appropriate
Turn down amplification factor.At this point, amplifying the setting of multiple using the amplification factor switching push button.Due to the times magnification
Number switching push button output end is connected with centralized control unit 40, can will be transmitted the control instruction of amplification factor by the connection
To centralized control unit 40, which is transmitted separately to connected to it every by centralized control unit 40 by internal bus
Weak current signal amplification unit 20 in a data acquisition channel, to complete under MANUAL CONTROL mode, weak current amplifying unit
The setting of 20 amplification factor.
Due to the voltage to frequency convert unit 30 in N number of data acquisition channel output end with centralized control unit 40,
I.e. centralized control unit 40 can monitor the frequency values of the output of voltage to frequency convert unit 30 in real time, and the frequency values are transmitted to
It is shown on computer.Optionally, centralized control unit 40 is provided with monitoring modular 460, N number of voltage to frequency convert unit 30
Output end be connected with monitoring modular 460, the frequency that monitoring modular 460 is used to export voltage to frequency convert unit 30 into
Row monitoring, and the frequency data monitored are transmitted to computer 50.
Since pulse frequency is proportional to voltage value, experimenter can determine that current amplification factor is by the frequency values
No and input light current flow stage matches.For example, can use computer 50 when mismatching and amplify setting for multiple
It is fixed.The control instruction of amplification factor is transmitted to centralized control unit 40 by communication interface 60 by computer 50, and center control is single
The control instruction is transmitted separately to the letter of the weak current in each data acquisition channel connected to it by internal bus by member 40
Number amplifying unit 20, to complete under remote control mode, the setting of the amplification factor of weak current amplifying unit 20.
Further, in synchrotron radiation experiment, the signal of measurement is generally not fixed value, is with time real-time change
's.Therefore it needs the frequency exported to voltage to frequency convert unit 30 to integrate, determining frequency values is obtained by integral.Cause
This, centralized control unit 40 is provided with N number of counting module 410, N number of counting module 410 and the voltage in N number of data acquisition channel
There are one-to-one relationships between frequency translation unit 30.It on this basis, include that weak current is believed in every circuit-switched data acquisition channel
Number amplifying unit 20 and corresponding voltage to frequency convert unit 30, counting module 410.In every circuit-switched data acquisition channel
The pulse duration frequency signal that voltage signal converting unit 30 exports, which is transmitted in counting module 410 corresponding thereto, to be integrated,
The time (i.e. how many a pulses are once integrated) of integral can be set by experimenter by computer 50.
To sum up, low current amplifier 20, voltage to frequency converter 30, counting module 410 constitute complete data all the way
Acquisition channel.In data acquisition, every circuit-switched data acquisition channel obtains weak current by X-ray detector and exports faint electricity
Signal is flowed, the output voltage signal after the amplification conversion of low current amplifier 20, then be converted to via voltage to frequency converter 30
Frequency signal carries out Integral Processing to the frequency signal finally by counting module 410, obtains each channel X in setting time
The integrated value of transmitted intensity, the integrated value more accurately represent X-ray intensity, obtain determining frequency signal value, and pass through
The frequency signal value is transmitted to computer 50 by communication interface 60, carries out processing analysis to the frequency signal on computer 50,
Realize the demand of weak current multichannel data parallel acquisition.In addition, in every circuit-switched data acquisition channel, low current amplifier 20 export
Voltage signal can be directly displayed in display interactive unit 10 on corresponding voltage display table, every circuit-switched data acquisition is logical
In road, frequency signal that voltage to frequency convert unit 30 exports by monitoring modular 460, can directly display on computers,
Data are observed in real time convenient for user.
Further, centralized control unit 40 is additionally provided with N number of data cache module 420 and communication module 430, N number of number
According to there are one-to-one relationships between cache module 420 and N number of counting module 410.That is, in each data acquisition channel
It can also include data cache module 420.Each counting module 410 connects corresponding data cache module 420, is accumulated
The frequency count for the determination handled well is divided to be stored in the data cache module 420.The connection of communication module 430 is arranged in cabinet
Communication interface 60 outside 1, when centralized control unit 40 is connect by communication interface 60 with computer 50, communication module 430
The frequency signal data in the cache module 420 of each data channel are transferred, computer 50 is transmitted to by communication interface 60.
Further, centralized control unit 40 is additionally provided with encoding setting module 440 and coding output module 450, coding
The output end phase with the output end of the control mode switch button, the amplification factor switching push button respectively of setup module 440
Connection, encoding setting module 440 are connected with the input terminal of control model display lamp 1220 and coding output module 450 respectively,
Encoding output unit 450 is connected with the weak current signal amplification unit 20 in each data acquisition channel respectively.
Specifically, when carrying out manual mode and remote control mode switching by the control mode switch button, switching letter
Number encoded setup module 440 is transmitted to control model display lamp 1220, and control model display lamp 1220 is shown and is worked as
Preceding control model.
Specifically, 8 systems can be encoded using 3 tunnels to amplify the setting of multiple.Experimenter passes through the amplification
Multiple switching push button amplifies the setting operation of multiple, and encoding setting module 440 generates corresponding in response to the setting operation
8 system, 3 road coding, every kind of 3 roads coding correspond to an amplification factor, that is, share the amplification factor of 8 gears.Encoding setting mould
For block 440 by the 3 tunnel coding transmission to coding output module 450, encoded output module 450 is sent to every number connected to it
According to the weak current signal amplification unit 20 in acquisition channel, to complete the setting of amplification factor.
When experimenter amplifies the setting operation of multiple by computer 50, which passes through communication interface
60, communication module 430 is transmitted to encoding setting module 440, encoding setting module 440 in response to the setting operation, generates and corresponds to
8 system, 3 road coding, every kind of 3 road coding corresponds to an amplification factor, that is, shares the amplification factor of 8 gears.Encoding setting
By the 3 tunnel coding transmission to coding output module 450, encoded output module 450 is sent to connected to it each module 440
Weak current signal amplification unit 20 in data acquisition channel, to complete the setting of amplification factor.
Optionally, communication module 430 is connected with encoding setting module 440.Manual mode is carried out when passing through computer 50
When with remote control mode switching, switching signal is transmitted in the communication module 430 of centralized control unit 40 through communication interface 60, then is led to
It crosses encoding setting module 440 and is transmitted to control model display lamp 1220, control model display lamp 1220 is shown currently
Control model.
Optionally, monitoring modular 460 is connected with communication module 430, and frequency signal is made to pass through communication module 430 and communication
Interface 60 transports to computer 50.
It will be understood by those skilled in the art that the connection between the modules in centralized control unit 40 is empty
Quasi- connection.
Fig. 3 is the layout of data acquisition device provided by the embodiment of the utility model, as shown in figure 3, N number of weak current is believed
Number amplifying unit 20 and N number of voltage to frequency convert unit 30 are fixed on the bottom plate of cabinet 1, and centralized control unit 40 is perpendicularly fixed at
The rear panel of 1 inside of cabinet, N number of voltage display table 110 and interaction subelement 120 are fixed on the front panel in 1 outside of cabinet, communication
Interface 60 is fixed on the rear panel in 1 outside of cabinet.Entire cabinet configuration design is simple and compact for structure, is convenient for operating.
Data acquisition device provided by the embodiment of the utility model, will weak current signal data acquisition system in the prior art
In each discrete special equipment function be integrated in same cabinet so that the integrated level of data acquisition device is high, maintenance is simple；Together
When, include multi-channel data acquisition channel in the device, improve the speed of data acquisition efficiency and device operation, reliability and
Stability；In addition, the device can amplify controling and monitoring for multiple simultaneously by display panel and computer, avoid out
The unmatched situation of light current flow stage of existing amplification factor and input.It is communicated, is realized by Peripheral Interface and computer
Data acquire full-range full automation.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the embodiment of the present application, rather than it is limited
System；Although the application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: its
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equal
Replacement；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution various embodiments of the utility model technical side
The spirit and scope of case.
Orientation or positional relationship shown in the drawings is merely for convenience of description the invention and simplifies description, rather than
The device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot
It is interpreted as the limitation to the invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as
Indication or suggestion relative importance or the quantity for implicitly indicating indicated technical characteristic." first ", " are defined as a result,
Two " etc. feature can explicitly or implicitly include one or more of the features.In the description of the invention, remove
Non- to be otherwise noted, the meaning of " plurality " is two or more.
In the description of the invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State concrete meaning of the term in the invention.
Claims (9)
1. a kind of data acquisition device, comprising: cabinet, is arranged in institute the display interactive unit that the case front panel is arranged in
State the communication interface of cabinet rear panel and the computer being arranged in outside the cabinet, it is characterised in that:
It is single that the cabinet inside is provided with N number of weak current signal amplification unit, N number of voltage to frequency convert unit and center control
Member, the display interactive unit include N number of voltage display table and interaction subelement, wherein N is the positive integer greater than 1, N number of institute
It states a pair of there are one between weak current signal amplification unit, N number of voltage to frequency convert unit and N number of voltage display table
The relationship answered；
The output end of the weak current signal amplification unit is separately connected the corresponding voltage to frequency convert unit and its
The corresponding voltage shows that table, the output end of N number of voltage to frequency convert unit are connected with the centralized control unit
It connects；
The centralized control unit is connected with N number of weak current signal amplification unit respectively by internal bus, by interior
Portion's signal link is connected with the subelement that interacts；
The centralized control unit is connected by the communication interface with the computer.
2. the apparatus according to claim 1, which is characterized in that the interactive subelement includes switching push button and control model
Display lamp, the switching push button include control mode switch button and amplification factor switching push button, and the control mode switch is pressed
The output end of the output end of button and the amplification factor switching push button is connected with the centralized control unit respectively, the control
The input terminal of mode display lamp is connected with the centralized control unit.
3. the apparatus of claim 2, which is characterized in that the centralized control unit is provided with monitoring modular, N number of institute
The output end for stating voltage to frequency convert unit is connected with the monitoring modular, and the monitoring modular is used for the number that will be monitored
According to being transmitted to the computer.
4. device according to claim 3, which is characterized in that the centralized control unit be provided with encoding setting module and
Encode output module, the encoding setting module respectively with the output end and the amplification factor of the control mode switch button
The output end of switching push button is connected, the encoding setting module respectively with the input terminal of the control model display lamp and described
Coding output module is connected, and the coding output module is connected with N number of weak current signal amplification unit respectively.
5. device according to claim 4, which is characterized in that the centralized control unit be additionally provided with N number of counting module,
N number of data cache module and communication module, N number of data cache module, N number of counting module and N number of voltage frequency
There are one-to-one relationship between rate converting unit, the voltage to frequency convert unit connects the corresponding count module
Block, the counting module connect the corresponding data cache module, the data cache module and the communication mould
Block is connected, and the communication module is connected with the communication interface.
6. device according to claim 5, which is characterized in that the communication module is connected with the encoding setting module
It connects.
7. device according to claim 5, which is characterized in that the monitoring modular is connected with the communication module, makes
The data are transmitted to the computer by the communication module.
8. the apparatus according to claim 1, which is characterized in that N number of weak current signal amplification unit and N number of electricity
Pressure frequency translation unit is fixed on the bottom plate of the cabinet, after the centralized control unit is perpendicularly fixed on the inside of the cabinet
Panel.
9. the apparatus according to claim 1, which is characterized in that the input terminal of the weak current signal amplification unit is penetrated with X
Line detector is connected.
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|---|---|---|---|
| CN201821049814.4U CN208443916U (en) | 2018-06-29 | 2018-06-29 | A kind of data acquisition device |
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| CN201821049814.4U CN208443916U (en) | 2018-06-29 | 2018-06-29 | A kind of data acquisition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872698A (en) * | 2018-06-29 | 2018-11-23 | 天津敬慎坊科技有限公司 | A kind of data collection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108872698A (en) * | 2018-06-29 | 2018-11-23 | 天津敬慎坊科技有限公司 | A kind of data collection system |
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Granted publication date: 20190129 |