CN207268757U - A kind of resonator axial electric field measuring device - Google Patents
A kind of resonator axial electric field measuring device Download PDFInfo
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- CN207268757U CN207268757U CN201721231057.8U CN201721231057U CN207268757U CN 207268757 U CN207268757 U CN 207268757U CN 201721231057 U CN201721231057 U CN 201721231057U CN 207268757 U CN207268757 U CN 207268757U
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Abstract
The utility model discloses a kind of resonator axial electric field measuring device, the device includes mechanical structure portion and measurement control section, mechanical structure portion includes main body frame, pulley, driving structure, draught line and perturbation body, measuring control section includes excitation module, environment monitoring module and analysis module, perturbation body is located on the draught line of vertical state, moved by pulley drive draught line, ensure that perturbation body moves on the center line of tested resonator, by encouraging module to launch pumping signal to tested resonator, and gather feedback signal when perturbation body is located at diverse location, obtain the resonant frequency of resonator when perturbation body is located at diverse location, the resonant frequency of resonator obtains the resonator electric field strength of current location under the resonant frequency of resonator and current environment when being located at diverse location according to perturbation body.The present apparatus improves electric field strength accuracy by ensureing the concentricity of perturbation body movement locus and tested resonator center line.
Description
Technical field
The utility model belongs to electron linear accelerator field, is measured more particularly, to a kind of resonator axial electric field
Device.
Background technology
Electron linear accelerator is applied not only to the basic scientific researches such as high-energy physics, also has in civil field and widely should
With.Medically, the clinac for having had different-energy in countries in the world at present is being run, and carrying out radiation to tumour controls
Treat.In industrial circle, electron linear accelerator can be used for industrial flaw detection and irradiation processing.In agriculture field, especially in food
Irradiation processing and breeding cultivation in terms of, electron linear accelerator is widely used.
Resonant cavity is the key component in linear accelerator, in resonant cavity internal excitation electricity after microwave power feed-in
, and then accelerate electronics.Therefore before fixing resonance cavity, the measurement to the resonant frequency of resonant cavity, and measure its axial direction
Electric field curve tool whether consistent with design of Simulation with resonant frequency is of great significance.Since cavity is a closing knot
Structure, can not directly measure its internal electric field axial intensity distribution.
Utility model content
For the disadvantages described above or Improvement requirement of the prior art, the utility model provides a kind of resonator axial electric field and surveys
Device and measuring method are measured, its object is to solve existing measuring device not ensureing the coaxial of measuring probe and resonator
Spend and cause the inaccurate technical problem of axial electric field measurement.
To achieve the above object, according to the one side of the utility model, there is provided a kind of resonator axial electric field measurement
Device, including：First pulley, second pulley, the 3rd pulley, the 4th pulley, draught line, main body frame, perturbation body, excited modes
Block, driving structure, environment monitoring module and analysis module；
Main body frame is equipped with upper beam and lower bottom base, and upper beam and lower bottom base are arranged in parallel, lower bottom base upper surface and upper horizontal stroke
Beam lower surface is equipped with guide rail, and driving structure is installed on lower bottom base, and first pulley is connected with driving structure, and second pulley is located at
On the upper rail of lower surface, the 3rd pulley and the 4th pulley are located on the guide rail on upper beam lower surface, and first pulley, the second cunning
Wheel, the 3rd pulley and the 4th pulley are generally aligned in the same plane；First pulley, second pulley, the 3rd pulley and the 4th pulley by
The draught line connection of annular；
The draught line placed vertically between second pulley and the 4th pulley is located on the center line of resonator to be measured, perturbation body
It is fixed on the draught line between second pulley and the 4th pulley, for changing resonator interior resonance frequency to be measured while not destroying
Field strength distribution in resonator to be measured；Driving structure is used to drive first pulley to rotate and then drives draught line movement, makes perturbation body
Moved along resonator center line, ensure the concentricity of perturbation body movement locus and resonator center line to be measured；
Excitation module is used to produce pumping signal and gathers the feedback signal that perturbation body is located at diverse location, and pumping signal is made
Make resonant on resonator to be measured；
Environment monitoring module is used for monitoring of environmental information；
Analysis module, its first input end is with encouraging the output terminal of module to be connected, its second input terminal and environmental monitoring mould
The output terminal connection of block, feedback signal and environmental information for being located at diverse location according to perturbation body are obtained in resonator to be measured
Axial field strength.
Preferably, multiple threaded holes are equipped with the lower bottom base of main body frame, for adjusting the position of driving structure so that
First pulley, second pulley, the 3rd pulley and the 4th pulley are generally aligned in the same plane.
Preferably, resonator axial electric field measuring device further includes tensioning wheel, is installed in driving structure；Leading in a ring
Lead is placed on tensioning wheel, and tensioning wheel is used to improve the frictional force between draught line and each pulley.
Preferably, analysis module includes：
Parameter conversion unit, its input terminal is connected as the output terminal of analysis module, for according under standard vacuum state
Resonant frequency and environmental information obtain resonant frequency under current environment；And
Electric Field Numerical acquiring unit, its first input end are connected with the output terminal of parameter conversion unit, its second input terminal
As the second input terminal of analysis module, obtained for resonant frequency under the feedback signal according to diverse location and current environment humorous
Shake the axial field strength of chamber diverse location.
Preferably, perturbation body is conductive material.
In general, by the contemplated above technical scheme of the utility model compared with prior art, can obtain down
Row beneficial effect：
1st, in device provided by the utility model, by positioned at the draught line of second pulley and the placement of the 4th pulley center vertical
As measurement line, perturbation body is located in section traction, is rotated by motorized driver pulley and drives draught line to move, and ensures perturbation body
The concentricity of moving displacement and tested resonator center line is high, and measurement result is more accurate.
2nd, the device is equipped with guide rail, pulley position easy to remove, while pulley is directly mounted on section bar, both ensures
Structure it is compact with simple, and cause adjustable pulley between position it is more convenient.
3rd, the device is equipped with tensioning wheel to compress draught line at motor transmission, increases the friction of draught line and pulley room
Power, when motor rotates band movable pulley, is not susceptible to skid, ensures the accuracy of measurement.
4th, measuring system is using industrial computer and remote controlled Network Analyzer, stepper motor and environmental monitoring collection
Into module combination, it can be achieved that all automatic measurement, and measurement process quick and stable.
Brief description of the drawings
Fig. 1 is the structure diagram of resonator axial electric field measuring device provided by the utility model；
Fig. 2 is the fundamental diagram of resonator axial electric field measuring device provided by the utility model；
Fig. 3 is the measuring method flow chart provided by the utility model based on resonator axial electric field measuring device；
Wherein：1 is main body frame；2 be guide rail；3 be resonator supporting item；4 be stepper motor；5 be the first fixed pulley；6
For the second fixed pulley；7 be tensioning wheel；8 be resonator to be measured；9 be Network Analyzer；10 be perturbation body；11 be excitation probe；12
For the 3rd pulley；13 be the 4th pulley.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining
The utility model, is not used to limit the utility model.In addition, institute in each embodiment of the utility model disclosed below
As long as the technical characteristic being related to does not form conflict and is mutually combined each other.
Fig. 1 is the structure diagram of resonator axial electric field measuring device provided by the utility model, which is divided into machine
In two sub-sections, mechanical structure portion includes main body frame 1 for tool structure division and measurement control unit, and main body frame 1 is used to provide
Installation support, main body frame 1 include lower bottom base, left support frame, right support frame and upper beam, and driving structure includes stepper motor 4
And motor supports, motor supports are installed on lower bottom base, stepper motor 4 is installed in motor supports, and first pulley 5 is pacified
On output shaft loaded on stepper motor, stepper motor 4 is used to drive first pulley 5 to rotate, support base installation motor supports
Place, is equipped with several screw holes, is so the position of regulation motor supporting item for convenience so that the pulley on motor shaft also may be used
With lateral adjustments, this is done to ensure first pulley 5, second pulley 6, the 3rd pulley 12 and the 4th pulley 13 positioned at same
Plane.Tensioning wheel is installed on motor supports, and can left and right adjusting to adjust the pressure size to line.Upper beam passes through three
Angle support is fixed on the left and right sidesing supporting frame placed vertically, and the position of adjustable A-frame is to adjust the height of upper beam.It is humorous
The chamber that shakes is placed on the supporting item of cavity.One section of guide rail 2 is fixed on lower bottom base at the same time, second pulley 6 is installed on guide rail 2, the
Two pulleys 6 can move on guide rail, 6 position of adjustment second pulley, convenient that different size of cavity is measured.Upper beam
Lower section is equipped with guide rail, and the 3rd pulley 12 and the 4th pulley 13 are respectively positioned on the guide rail of upper beam, the 3rd pulley 12 and the 4th pulley
13 can set guide rail to move below upper beam.Left support frame, right support frame and upper beam were in the present embodiment
2011 aluminium alloy extrusions, sliding block is installed in the groove of aluminium alloy extrusions, and the 3rd pulley 12 and the 4th pulley 13 are fixed on sliding block
On can both realize that the 3rd pulley and the 4th pulley moved.
First pulley 5, second pulley 6, the 3rd pulley 12 are connected with the 4th pulley 13 by draught line in a ring, can be with
Mobile first pulley 5, second pulley 6, the 3rd pulley 12 and the 4th pulley 13 is convenient for measuring various sizes of resonator, and protects
Demonstrate,prove the draught line between 6 the 4th pulleys 13 of second pulley and keep vertical.Between 6 and the 4th pulley 13 of second pulley
The draught line placed vertically is located on resonant cavity supporting item 3 by the center line of resonator 8 to be measured, resonator 8, perturbation body 10
It is fixed on the draught line between 6 and the 4th pulley 13 of second pulley, so that perturbation body 10 is located in resonator 8 to be measured
On heart line, stepper motor 4 drives first pulley 5 to rotate and then drives draught line to move, and makes perturbation body 10 along resonator 8 to be measured
Center line moves, and ensures 10 movement locus of perturbation body and the concentricity of 8 center line of resonator to be measured, perturbation body 10 is conduction material
Material, can change 8 interior resonance frequency of resonator to be measured while not change field strength distribution in resonator 8 to be measured.In order to further
Increase the frictional force between four pulleys of draught line, be equipped with tensioning wheel 7 between 5 and the 3rd pulley 12 of first pulley, pass through step
Stepper motor rotational angle can accurately obtain positional information of the perturbation body 10 in resonator 8 to be measured, so as to accurately be treated
The axial upper field intensity information of resonator 8 is surveyed, while tensioning wheel 7 can make the vertical line degree of draught line smaller.
Measuring control section includes excitation module, environment monitoring module and analysis module, and excitation module includes network point
Analyzer 9 and excitation probe 11, Network Analyzer 9 produce the pumping signal of fixed frequency, and excitation probe 11 is through coaxial line and network
9 output terminal of analyzer connects, and pumping signal is transferred to resonator by excitation probe, and pumping signal is acted on resonator 8 to be measured
Make 8 resonance of resonator to be measured, Network Analyzer 9 gathers the feedback signal that perturbation body 10 is located at diverse location, feedback signal at the same time
The first input end of analysis module is delivered to, environment monitoring module is defeated by the second of its monitoring of environmental information conveyance to analysis module
Enter end, the resonant frequency of resonator under standard vacuum is switched to work as front ring by parameter conversion unit according to environmental information in analysis module
The resonant frequency of resonator under border, i.e., obtain current warm and humid according to the resonant frequency of resonator under ambient temperature and humidity and standard vacuum
The resonant frequency of perturbation body 10 it is not put under degree, Electric Field Numerical acquiring unit is exported according to parameter conversion unit in analysis module
The feedback signal of the current location of the resonant frequency of resonator and excitation module output obtains the field of current location under current environment
Strong signal.
The electric field measurement of intra resonant cavity uses the pattern of point-to-point measurement, and measurement strategies are to utilize to encourage module to produce fixation
The pumping signal of frequency, with a probe through cavity coupling aperture feed-in resonant cavity.Resonant cavity axial centre is provided with an aperture, wears
Saturating cavity both ends.It is to have perturbation body 10 to be wrapped on the draught line on pulley, since the presence of perturbation body 10 causes cavity resonant
Frequency changes, and is located at feedback signal under diverse location by encouraging module to gather perturbation body 10, is extracted from feedback signal
The resonant frequency of resonator when perturbation body 10 is located at diverse location, according to temperature, the humidity detected using environment monitoring module
And the resonant frequency under standard vacuum state obtains the resonant frequency of resonator under current environment, according to by excited modes
The difference of the resonant frequency of resonator obtains electric-field strength at this under resonant frequency and current environment that block measures at diverse location
Degree.After draught line is tightened, rotate to drive by stepper motor and be fixed on pulley on its axis and rotate, due to rubbing for line and pulley
Wiping power drives remaining fixed pulley to rotate, and the distance that motor shaft rotates is approximately equal to the distance of line movement, and the perturbation body 10 on line is along chamber
Body central axial direction is moved point by point, completes the measurement of electric field strength on chamber central axis.
Fig. 2 be resonator axial electric field measuring device embodiment provided by the utility model fundamental diagram, four cunnings
Wheel makes to be generally aligned in the same plane, and perturbation body is located on the traction line segment of vertical state, by adjusting perturbation body upper and lower ends
Pulley position can ensure the concentricity of draught line and resonator center line, and vertical cavity of placing can be measured.By four
A pulley is installed on by main body frame, being unlikely to deform made of 2011 aluminium alloy plates.Excitation module is in measurement control section
Network Analyzer and excitation probe, Network Analyzer produce the pumping signal of fixed frequency, and excitation probe is through coaxial line and network
Analyzer output terminal connects, and pumping signal is transferred to resonator and gathers feedback signal by excitation probe.Network Analyzer will be anti-
Feedback signal is delivered to industrial computer.Environment monitoring module includes temp probe and moisture probe, detects the temperature of current environment
Humidity, industrial personal computer receive the data of monitoring, under the conditions of carrying out resonator microwave parameters to the standard vacuum under conditions present
The conversion of microwave parameters.By computer installation Network Analyzer operating parameter, environmental monitoring data and measurement of correlation number are read
According to, while the movement of stepper motor is controlled, realize high-precision positioning.
The logic of measurement control section operation is that industrial computer will by friendly man-machine interface record electric field measurement
The measurement strategies asked, are then moved by computer-controlled stepper motor, position of the distance that stepper motor rotates as perturbation body
Confidence breath feeds back to computer, realizes high-precision positioning, and simultaneous computer control Network Analyzer realizes the excitation to cavity
With measurement, by the post processing of internal processes, computer have recorded position signal electric field corresponding with this of perturbation body at the same time
Value, so as to complete the electric field measurement of whole cavity axial direction.
Fig. 3 is the flow of the measuring method provided by the utility model based on above-mentioned resonator axial electric field measuring device
Figure, method include the following steps：
S1 excitations module persistently produces pumping signal, and pumping signal, which is acted in resonator to be measured, makes generation in resonator humorous
Shake；
S2 driving structures driving first pulley 5, which rotates unit angle, walks perturbation body Moving Unit in resonator to be measured
It is long；
The feedback signal that pumping signal returns after S3 collection perturbation body Moving Unit step-lengths, and according to resonator standard vacuum
Resonant frequency and environmental signal obtain resonant frequency under resonator current environment under state；
S4 obtains current location axial field according to resonant frequency under resonator current environment and the feedback signal of current location
By force；
S5 judges whether perturbation body movement step number is more than the mobile step number of setting, if so, the then axial field strength of output cavity
Distributed data, otherwise, return to step S2.
Wherein, mobile step number is set to be determined according to cavity length and perturbation body one step.Perturbation body unit movement step
It is long related with stepper motor rotation unit angle and pulley radius.In order to further improve measurement accuracy, treat that the movement of perturbation body stops
The anti-feedback signal returned of pumping signal is gathered after only, reduces influence of the vibrations to resonant frequency.
As in resonator axial electric field measuring method embodiment provided by the utility model, worked as according to equation below
Resonant frequency under preceding environment：
Wherein, frFor the resonant frequency of resonator under current environment, f0For the resonant frequency of resonator under vacuum, εrTo work as
Relative dielectric constant under preceding environment, Δ fTIt is that test temperature is different from caused frequency change during cavity operating temperature.
Current location axial direction field strength is obtained according to equation below：
Wherein, the resonant frequency of resonator, f when f is located at current location for perturbation bodyrFor under current environment resonator it is humorous
Vibration frequency, the power of W pumping signals, Δ ε are the dielectric constant of perturbation body and the difference of dielectric constant of air, and V' is perturbation body body
Product.
Measuring method provided by the utility model, since perturbation body is located on the draught line of vertical state, passes through cunning
Wheel drive draught line moves, and can ensure that perturbation body moves on the center line of tested resonator.By encouraging module to tested
Resonator launches pumping signal, and gathers feedback signal when perturbation body is located at diverse location, obtains perturbation body and is located at diverse location
When resonator resonant frequency.Resonator under the resonant frequency of resonator and current environment when being located at diverse location according to perturbation body
Resonant frequency obtain current location resonator electric field strength.The present apparatus is by ensureing perturbation body movement locus and tested resonance
The concentricity of chamber center line, improves electric field strength accuracy.
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification for being made where within the spirit and principles of the present invention, equivalent substitution and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (5)
- A kind of 1. resonator axial electric field measuring device, it is characterised in that including：First pulley (5), second pulley (6), the 3rd pulley (12), the 4th pulley (13), draught line, main body frame (1), perturbation Body (10), excitation module, driving structure (4), environment monitoring module and analysis module；The main body frame (1) is equipped with upper beam and lower bottom base, and the upper beam and the lower bottom base are arranged in parallel, the bottom Seat upper surface and the upper beam lower surface are equipped with guide rail, and the driving structure (4) is installed on the lower bottom base, and described the One pulley (5) is connected with driving structure, and the second pulley (6) is located on the upper rail of lower surface, the 3rd pulley (12) and 4th pulley (13) is located on the guide rail on upper beam lower surface, and the first pulley (5), the second pulley (6), 3rd pulley (12) and the 4th pulley (13) are generally aligned in the same plane；The first pulley (5), second pulley (6), Three pulleys (12) are connected with the 4th pulley (13) by draught line in a ring；The draught line placed vertically between the second pulley (6) and the 4th pulley (13) is located at the center of resonator to be measured On line, the perturbation body (10) is fixed on the draught line between the second pulley (6) and the 4th pulley (13), is changed Resonator interior resonance frequency to be measured does not destroy field strength distribution in resonator to be measured at the same time；Driving structure (4) driving first is slided Wheel (5) rotates and then drives the draught line to move, and the perturbation body (10) is moved along resonator center line, described in guarantee The concentricity of perturbation body (10) movement locus and resonator center line to be measured；The excitation module produces pumping signal and gathers the feedback signal that the perturbation body is located at diverse location, the excitation letter Number acting on resonator to be measured makes resonant；The environment monitoring module monitoring of environmental information；The analysis module, its first input end are connected with the output terminal of the excitation module, its second input terminal and the ring The output terminal connection of border monitoring modular, is located at the feedback signal of diverse location according to perturbation body and environmental information obtains resonance to be measured Intracavitary axial direction field strength.
- 2. resonator axial electric field measuring device as claimed in claim 1, it is characterised in that in the main body frame (1) Lower bottom base is equipped with multiple threaded holes, adjusts the position of driving structure, ensures the first pulley (5), the second pulley (6), the 3rd pulley (12) and the 4th pulley (13) are generally aligned in the same plane.
- 3. resonator axial electric field measuring device as claimed in claim 1 or 2, it is characterised in that resonator axial electric field is surveyed Amount device further includes tensioning wheel (7), it is installed in driving structure；Draught line in a ring is placed on the tensioning wheel, tensioning Wheel improves the frictional force between draught line and each pulley.
- 4. resonator axial electric field measuring device as claimed in claim 1 or 2, it is characterised in that the analysis module includes：Parameter conversion unit, its input terminal is connected as the output terminal of analysis module, according to resonant frequency under standard vacuum state Resonant frequency under current environment is obtained with the environmental information；AndElectric Field Numerical acquiring unit, its first input end are connected with the output terminal of parameter conversion unit, its second input terminal conduct Second input terminal of analysis module, obtains humorous according to resonant frequency under the feedback signal of the diverse location and the current environment Shake the axial field strength of chamber diverse location.
- 5. resonator axial electric field measuring device as claimed in claim 1 or 2, it is characterised in that the perturbation body (10) is Conductive material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721231057.8U CN207268757U (en) | 2017-09-21 | 2017-09-21 | A kind of resonator axial electric field measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721231057.8U CN207268757U (en) | 2017-09-21 | 2017-09-21 | A kind of resonator axial electric field measuring device |
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| CN207268757U true CN207268757U (en) | 2018-04-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589313A (en) * | 2017-09-21 | 2018-01-16 | 华中科技大学 | A kind of resonator axial electric field measurement apparatus and measuring method |
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2017
- 2017-09-21 CN CN201721231057.8U patent/CN207268757U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589313A (en) * | 2017-09-21 | 2018-01-16 | 华中科技大学 | A kind of resonator axial electric field measurement apparatus and measuring method |
| CN107589313B (en) * | 2017-09-21 | 2023-08-04 | 华中科技大学 | Resonant cavity axial electric field measuring device and measuring method |
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