CN109632832A - A kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method - Google Patents
A kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method Download PDFInfo
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- CN109632832A CN109632832A CN201910063588.8A CN201910063588A CN109632832A CN 109632832 A CN109632832 A CN 109632832A CN 201910063588 A CN201910063588 A CN 201910063588A CN 109632832 A CN109632832 A CN 109632832A
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- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/04—Investigating moisture content
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Abstract
The invention discloses a kind of cereal moisture percentage measuring devices based on frequency sweep microwave penetration method, including Microwave emission end, microwave receiving end, antenna hoistable platform and control unit；Microwave emission end and microwave receiving end are slidably arranged in the lower half-space and upper half-space of antenna hoistable platform respectively；Control unit completes being automatically aligned to for microwave antenna according to the signal of laser alignment sensor and the decaying deviation mobile microwave antenna of microwave signal；Combine antenna far field condition, measurement of water ratio result are representative and reduce the three conditions determinations of spatial microwave transmission loss and adjust to optimal measurement distance and antenna distance；Replace the signal of single-frequency as the measuring signal of moisture percentage measuring apparatus using the microwave sweep signal of optimization, grain moisture information is more comprehensively obtained while inhibiting multipath reflection to influence, the model trained using machine learning algorithm carries out the high-acruracy survey of quick nondestructive to the moisture content of cereal.
Description
Technical field
The present invention relates to grain quality detections, survey more particularly, to a kind of cereal moisture percentage based on frequency sweep microwave penetration method
Device is measured, the measurement of cereal moisture percentage quick nondestructive is primarily adapted for use in, device is inhibiting multipath reflection shadow using microwave sweep signal
Grain moisture information is more comprehensively obtained while sound, is the key device for improving cereal moisture percentage measuring system precision.
Technical background
Moisture content is a key property of cereal, there is very big influence to its physics, chemical property.Cereal it is aqueous
Rate influences the various aspects such as its harvest, storage, transport, processing, the key index that even more certain grain qualities are judged.Microwave detection
As a kind of emerging cereal moisture percentage detection method contactless non-destructive testing may be implemented, space wave therein is saturating in method
Penetrating method allows microwave to penetrate cereal to be measured with spatial radiation patterns, not only can detecte cereal appearance water, can also detect paddy
Object internal moisture, moisture content testing result representativeness is good, therefore to be applied to cereal more and more aqueous for spatial microwave wave transmission beam method
In rate detection system.
Space wave transmission beam method needs two microwave antennas to be mounted on the two sides up and down of tested material, and an antenna emits micro-
Wave, in addition a reception microwave, microwave radiation penetrate cereal to be measured into measurement space, and receiving antenna receives transmission microwave
Signal obtains the moisture content of tested cereal according to parameters such as the decaying of microwave signal, phase shifts.In microwave free space measurement process
The interference of multipath reflection is had, multipath reflection is one of the main source of decaying and phase-shift measurement error, and existing scholar proposes to adopt
It can inhibit the influence of multipath reflection with microwave sweep signal.CN 200920033543.8 proposes a kind of according to microwave attenuation
The device that amount variation measures moisture content of fabric, which has only used the microwave of single-frequency, and is calculating microwave
There is no reflection signal is considered when decaying, cause the pad value calculated bigger than Trueattenuation value.CN201710017788.0 is proposed
A kind of multi-frequency microwave moisture content detection system, using the swept-frequency signal of 300MHz~2.4GHz, but the detection system is directed to
Be liquid, be not suitable for cereal.It is aqueous that CN200910085533.3 proposes a kind of dual-source dual-probe orthogonal wave measurement that declines
Rate device is used for coal measurement of water ratio, it is contemplated that the characteristic of lower frequency microwave signals and high-frequency microwave signal, using 2.4GHz and
The microwave of two kinds of frequencies of 9.4GHz uses two sets of antennas, and measuring device is complex, and does not have equally when calculating microwave attenuation
There is consideration reflection signal, causes the pad value calculated bigger than Trueattenuation value.The current cereal based on microwave penetration method is aqueous
In rate measuring device, application and few, use of the microwave sweep signal in the moisture percentage measuring apparatus based on microwave penetration method
Swept-frequency signal can not only inhibit the influence of multipath reflection, but also can more comprehensively obtain the moisture information of cereal, in addition,
Alignment in the current cereal moisture percentage measuring device based on microwave penetration method between microwave transmitting and receiving antenna is usually with simple
Measuring tool combination eye-observation complete, the alignment precision between microwave transmitting and receiving antenna is poor, two antenna beam main lobes be overlapped
Spend it is not high, microwave signal transmission is imperfect, and transmitting antenna to tested material measurement apart from and microwave transmitting and receiving antenna it
Between distance setting all more arbitrarily, influence cereal moisture percentage and more accurately measure, therefore, need a kind of there is microwave to receive
Hair antenna is automatically aligned to, and measurement distance, antenna distance are automatically and reasonably arranged, and inhibits multipath reflection to influence using swept-frequency signal
The cereal moisture percentage measuring device of grain moisture information is more comprehensively obtained simultaneously.
Summary of the invention
It is more the purpose of the present invention is being directed to current the problems in the cereal moisture percentage measuring device based on microwave penetration method
The interference to microwave attenuation and phase-shift measurement is reflected again；Alignment between microwave transmitting and receiving antenna is usually with simple measuring tool
It is completed in conjunction with eye-observation, the alignment precision between microwave transmitting and receiving antenna is poor, and two antenna beam main lobe registrations are not high, microwave
Signal transmission is imperfect；Transmitting antenna is arranged all to the distance between the measurement distance of tested material and microwave transmitting and receiving antenna
More arbitrarily, influence cereal moisture percentage and more accurately measure, provide it is a kind of there is microwave transmitting and receiving antenna to be automatically aligned to, measurement away from
Automatically and reasonably it is arranged from, antenna distance, inhibits multipath reflection more comprehensively to obtain paddy while influence using swept-frequency signal
The cereal moisture percentage measuring device based on frequency sweep microwave penetration method of object moisture information.
The technical solution adopted for solving the technical problem of the present invention is:
A kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method, including Microwave emission end, microwave receiving end,
Antenna hoistable platform and control unit；Microwave emission end is slidably arranged in the lower half-space of antenna hoistable platform, is gone up and down by antenna
The movement of platform offer Z-direction；Microwave receiving end is slidably arranged in the upper half-space of antenna hoistable platform, is gone up and down by antenna flat
The movement of platform offer Z-direction；Microwave emission end, microwave receiving end and antenna hoistable platform are controlled by control unit, microwave
Transmitting terminal is used to emit microwave signal and adjusts the position of microwave transmitting antenna in the xy plane, and microwave receiving end is micro- for receiving
The position of wave signal and adjusting microwave antenna in the xy plane, antenna hoistable platform is for adjusting Microwave emission end and microwave
Receiving end makes device work in optimal detecting distance in the position of Z-direction, and control unit is according to Microwave emission end and microwave
The signal of receiving end feedback calculates the decaying A and phase shift phi of microwave signal, and input control unit measures cereal moisture percentage.
Further, the Microwave emission end includes transmission antenna unit and transmitting antenna mobile platform；Transmitting antenna list
Member is mounted in transmitting antenna mobile platform, provides the movement of XY both direction by transmitting antenna mobile platform；Transmission antenna unit
Including microwave transmitting antenna, receiving end laser-correlation sensor and first sensor bracket, receiving end laser-correlation sensor is logical
It crosses the first sensor bracket of two autonomous Designs and microwave transmitting antenna is combined into an entirety, reflected microwave transmitting antenna
Position
Further, the transmitting antenna mobile platform includes transmitting terminal X direction guiding rail, transmitting terminal X to sliding block, transmitting terminal X
To frame, transmitting terminal X to electric pushrod, transmitting terminal Y-direction guide rail, transmitting terminal Y-direction sliding block, transmitting terminal Y-direction frame, transmitting terminal Y-direction
Electric pushrod and transmitting terminal ultrasonic distance-measuring sensor, transmitting antenna mobile platform from can spatially be divided into X layers of transmitting terminal and hair
Y layers of end is penetrated, transmitting terminal X direction guiding rail, transmitting terminal X are constituted to frame and transmitting terminal X to electric pushrod to sliding block, transmitting terminal X to be emitted
X layers of end, first sensor bracket is fixed on transmitting terminal X on sliding block, and transmitting terminal X is slidably socketed to sliding block in transmitting terminal guide X
On rail, transmitting terminal X direction guiding rail and transmitting terminal X are fixed on transmitting terminal X to frame to electric pushrod, and transmitting terminal X is to electric pushrod
Extension end drives transmission antenna unit to slide along transmitting terminal X direction guiding rail；
Transmitting terminal Y-direction guide rail, transmitting terminal Y-direction sliding block, transmitting terminal Y-direction frame and transmitting terminal Y-direction electric pushrod constitute transmitting
Y layers of end, transmitting terminal X is fixed on transmitting terminal Y-direction sliding block to frame, and transmitting terminal Y-direction sliding block is slidably socketed leads in transmitting terminal Y-direction
Rail, transmitting terminal Y-direction guide rail and transmitting terminal Y-direction electric pushrod are fixed on transmitting terminal Y-direction frame, transmitting terminal Y-direction electric pushrod
Extension end is fixedly connected with transmitting terminal X to frame, by the flexible realization transmission antenna unit of transmitting terminal Y-direction electric pushrod along hair
End Y-direction guide rail sliding is penetrated, transmitting terminal ultrasonic distance-measuring sensor is mounted on transmitting terminal Y-direction frame, for detecting Microwave emission
The detecting distance of its line-spacing cereal to be measured.
Further, the microwave receiving end includes receiving antenna unit and receiving antenna mobile platform；Receiving antenna list
Member is mounted in receiving antenna mobile platform, provides the movement of XY both direction by receiving antenna mobile platform；Receiving antenna unit
Including microwave antenna, transmitting terminal laser-correlation sensor and second sensor bracket, transmitting terminal laser-correlation sensor is logical
It crosses the second sensor bracket of two autonomous Designs and microwave antenna is combined into an entirety, represent microwave antenna
Position.
Further, the receiving antenna mobile platform includes receiving end X direction guiding rail, receiving end X to sliding block, receiving end X
To frame, receiving end X to electric pushrod, receiving end Y-direction guide rail, receiving end Y-direction sliding block, receiving end Y-direction frame, receiving end Y-direction
Electric pushrod and receiving end ultrasonic distance-measuring sensor, receiving antenna mobile platform receiving end X layers and connect from can spatially be divided into
Y layers of receiving end, receiving end X direction guiding rail, receiving end X are constituted to electric pushrod to frame and receiving end X and are received to sliding block, receiving end X
X layers of end, second sensor bracket is fixed on receiving end X on sliding block, and receiving end X is slidably socketed to sliding block in receiving end guide X
On rail, receiving end X direction guiding rail and receiving end X are fixed on receiving end X to frame to electric pushrod, and receiving end X is to electric pushrod
Extension end drives receiving antenna unit to slide along receiving end X direction guiding rail；
Receiving end Y-direction guide rail, receiving end Y-direction sliding block, receiving end Y-direction frame and receiving end Y-direction electric pushrod, which are constituted, to be received
Y layers of end, receiving end X is fixed on the Y-direction sliding block of receiving end to frame, and receiving end Y-direction sliding block is slidably socketed leads in receiving end Y-direction
Rail, receiving end Y-direction guide rail and receiving end Y-direction electric pushrod are fixed on the Y-direction frame of receiving end, receiving end Y-direction electric pushrod
Extension end is fixedly connected with receiving end X to frame, is connect by the flexible realization receiving antenna unit edge of receiving end Y-direction electric pushrod
The sliding of receiving end Y-direction guide rail, receiving end ultrasonic distance-measuring sensor is mounted on the Y-direction frame of receiving end, for detecting microwave receiving
The distance of its line-spacing cereal to be measured, receiving end ultrasonic distance-measuring sensor use phase homotype with transmitting terminal ultrasonic distance-measuring sensor
Number ultrasonic distance-measuring sensor.
Further, the antenna hoistable platform includes rack, Z-direction guide rail, Z-direction sliding block, transmitting terminal lifting push rod and connects
Receiving end goes up and down push rod；Z-direction guide rail is mounted on the inside of rack flash, and transmitting terminal lifting push rod is mounted on the top of rack, transmitting
The extension end of end lifting push rod is connect with transmitting antenna mobile platform, and Microwave emission end is driven to move up and down along Z-direction guide rail；It connects
Receiving end lifting push rod is mounted on the lower part of rack, and the extension end of receiving end lifting push rod is connect with receiving antenna mobile platform, band
Dynamic microwave receiving end is moved up and down along Z-direction guide rail, and the fixing end of transmitting terminal lifting push rod and receiving end lifting push rod is mounted on
The outside of rack flash Different Plane, mutually staggers.Rack is the basis of antenna hoistable platform, is by aluminium alloy extrusions and company
The space framework of fitting composition, length, width and height are having a size of 780*380*1250mm；Four Z-direction guide rails are mounted on the interior of rack flash
Side, two-by-two relatively, eight Z-direction sliding blocks thereon are matched with Microwave emission end and microwave receiving end respectively, allow Microwave emission
End and the elevating movement on guide rail of microwave receiving end；Measurement of the mould loft floor between Microwave emission end and microwave receiving end is empty
Between, be made of four blocks of side plates and one piece of lay out board, can place the sample to be tested of 500mm*500mm*120mm volume, surrounding with
The mould loft floor snap-gauge for being mounted on rack flash matches；Four transmitting terminal lifting push rods are mounted on the top of rack, fixing end
It is connected in the outside of rack flash, extension end is connected to the angle point of transmitting antenna mobile platform in Microwave emission end by pin,
Transmitting antenna mobile platform is driven to move downward along Z-direction guide rail when extension end is stretched out, Microwave emission end decline, when extension end retracts
Transmitting antenna mobile platform is driven to move upwards along Z-direction guide rail, Microwave emission end rises, the stroke of four transmitting terminal lifting push rods
Reach 500mm, meets the requirement of Microwave emission end elevating movement；Four receiving end lifting push rods are mounted on the lower part of rack,
Its fixing end is connected in the outside of rack flash, and extension end is connected to receiving antenna mobile platform in microwave receiving end by pin
Angle point, extension end stretch out when drive receiving antenna mobile platform moved upwards along Z-direction guide rail, microwave receiving end rise, stretch out
Receiving antenna mobile platform is driven to move downward along Z-direction guide rail when end retracts, microwave receiving end decline, four receiving end liftings push away
The stroke of bar reaches 500mm, meets the requirement of microwave receiving end elevating movement；To avoid transmitting terminal from going up and down push rod and receiving end
It goes up and down and is interfered between the movement of push rod, the fixing end of transmitting terminal lifting push rod and receiving end lifting push rod is mounted on rack height
The outside of side Different Plane, mutually staggers.
Further, described control unit include embedded computer system, microcontroller, microwave signal generator, every
From device, variable attenuator, the first directional coupler, circulator, the second directional coupler, third directional coupler, phase discriminator,
One wave detector, second detector, third detector, A/D converter and temperature sensor；Embedded computer system passes through bus
It is connected to microcontroller, microcontroller is connected with microwave signal generator, microwave signal generator, isolator, variable attenuator
It is sequentially connected with the first directional coupler, the output end and coupled end of the first directional coupler, which are separately connected circulator and second, to be determined
To coupler, circulator is separately connected second detector and the microwave transmitting antenna, the output end of the second directional coupler and
Coupled end is separately connected first detector and phase discriminator, and the output end and coupled end of third directional coupler are separately connected third inspection
Wave device and phase discriminator, phase discriminator, first detector, second detector and third detector are connected to A/D converter, A/D conversion
Device and temperature sensor are connected to microcontroller；Microwave sweep signal when microwave signal generator generation device measures；Isolation
Device, variable attenuator, the first directional coupler, circulator, the second directional coupler and third directional coupler are to constitute microwave
The microwave device of access；The decaying of first detector, second detector and third detector measurement microwave signal, phase discriminator measurement
The phase shift of microwave signal.
Further, described control unit using amplitude certain, frequency consecutive variations in Measurement bandwidth microwave swept frequency
Measuring signal of the signal as device more comprehensively obtains grain moisture information while inhibiting multipath reflection to influence；It sweeps
The centre frequency f of frequency signal0It is determined with Measurement bandwidth BW by the type of cereal, and according to the characterisitic parameter of microwave antenna to frequency sweep
Signal optimization, removes bad frequency point, using the measuring signal that the swept-frequency signal after optimization is final as device.
The invention has the beneficial effects that: it uses microwave sweep signal as measuring signal, multipath reflection is inhibited to influence
While more comprehensively obtain grain moisture information, meanwhile, by antenna alignment, measurement distance and antenna distance be rationally arranged
Basis when as measurement of water ratio, guarantees microwave signal transmission integrality and microwave antenna is in sensitive position area
Between, improve the measurement accuracy of cereal moisture percentage.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is that the present invention is based on the axonometric schematic diagrams of the cereal moisture percentage measuring device of frequency sweep microwave penetration method；
Fig. 2 is the axonometric schematic diagram of transmission antenna unit of the present invention；
Fig. 3 is the axonometric schematic diagram of transmitting antenna mobile platform of the present invention；
Fig. 4 is the axonometric schematic diagram at Microwave emission end of the present invention；
Fig. 5 is the left view schematic diagram at Microwave emission end of the present invention；
Fig. 6 is the axonometric schematic diagram at microwave receiving end of the present invention；
Fig. 7 is the left view schematic diagram at microwave receiving end of the present invention；
Fig. 8 is the axonometric schematic diagram of inventive antenna hoistable platform；
Fig. 9 is the axonometric schematic diagram that Microwave emission end and microwave receiving end of the present invention are matched with antenna hoistable platform；
Figure 10 is mainly opened up the present invention is based on the structural block diagram of the cereal moisture percentage measuring device of frequency sweep microwave penetration method
Show the composition device of control unit；
In figure, Microwave emission end 1, microwave receiving end 2, antenna hoistable platform 3, control unit 4, transmission antenna unit 11,
Transmitting antenna mobile platform 12, microwave transmitting antenna 111, receiving end laser-correlation sensor 112, first support 113, transmitting terminal
X direction guiding rail 121, transmitting terminal X are led to sliding block 122, transmitting terminal X to frame 123, transmitting terminal X to electric pushrod 124, transmitting terminal Y-direction
Rail 125, transmitting terminal Y-direction sliding block 126, transmitting terminal Y-direction frame 127, transmitting terminal Y-direction electric pushrod 128, transmitting terminal ultrasonic distance measurement
Sensor 129, receiving antenna unit 21, receiving antenna mobile platform 22, microwave antenna 211, transmitting terminal laser-correlation pass
Sensor 212, second support 213, receiving end X direction guiding rail 221, receiving end X are to sliding block 222, receiving end X to frame 223, receiving end
X is electric to electric pushrod 224, receiving end Y-direction guide rail 225, receiving end Y-direction sliding block 226, receiving end Y-direction frame 227, receiving end Y-direction
Dynamic push rod 228, receiving end ultrasonic distance-measuring sensor 229, rack 31, Z-direction guide rail 32, Z-direction sliding block 33, mould loft floor 34, setting-out
It is decometer plate 35, transmitting terminal lifting push rod 36, receiving end lifting push rod 37, embedded computer system 401, microcontroller 402, micro-
Wave generator 403, isolator 404, variable attenuator 405, the first directional coupler 406, circulator 407, second orient
Coupler 408, third directional coupler 409, phase discriminator 410, first detector 411, second detector 412, third detector
413, A/D converter 414, temperature sensor 415.
Specific embodiment
Below in conjunction with attached drawing and example, the present invention is further described.
As shown in Figure 1, a kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method, including Microwave emission end 1,
Microwave receiving end 2, antenna hoistable platform 3 and control unit 4.Microwave emission end 1 is connected to antenna lifting by sliding block and guide rail
Platform 3 provides the movement of Z-direction by antenna hoistable platform 3 positioned at the lower half-space of antenna hoistable platform 3；Microwave receiving end
2 are connected to antenna hoistable platform 3 by sliding block and guide rail, positioned at the upper half-space of antenna hoistable platform 3, by antenna hoistable platform
3 provide the movement of Z-direction；As soon as foring a measurement space, tested material between Microwave emission end 1 and microwave receiving end 2
It is placed in this measurement space；Control unit 4 is located in the control cabinet of 3 side of antenna hoistable platform, is led respectively by general
Line and coaxial cable are connected to sensor, electric pushrod and microwave antenna in cereal moisture percentage measuring device.
As shown in Figure 2-5, Microwave emission end 1 includes transmission antenna unit 11 and transmitting antenna mobile platform 12, emits day
Line unit 11 is mounted on transmitting antenna mobile platform 12, provides the movement of XY both direction by transmitting antenna mobile platform 12.
Transmission antenna unit 11 includes microwave transmitting antenna 111, receiving end laser-correlation sensor 112 and first sensor bracket 113,
First sensor bracket 113 is fixed to the two sides of microwave transmitting antenna 111 by antenna flange, and two receiving end laser-correlations pass
Sensor 112 is respectively installed on two first sensor brackets 113, and microwave transmitting antenna 111 and receiving end laser-correlation sense
Device 112 has been combined into an entirety, and receiving end laser-correlation sensor 112 can reflect the position of microwave transmitting antenna 111.
Transmitting antenna mobile platform 12 includes transmitting terminal X direction guiding rail 121, transmitting terminal X to sliding block 122, transmitting terminal X to frame
123, transmitting terminal X to electric pushrod 124, transmitting terminal Y-direction guide rail 125, transmitting terminal Y-direction sliding block 126, transmitting terminal Y-direction frame 127,
Transmitting terminal Y-direction electric pushrod 128 and transmitting terminal ultrasonic distance-measuring sensor 129, transmitting antenna mobile platform 12 is from spatially may be used
It is divided into X layers and transmitting terminal Y layers of transmitting terminal, the distance between two layers is 43mm.
Transmitting terminal X direction guiding rail 121, transmitting terminal X are to sliding block 122, transmitting terminal X to frame 123 and transmitting terminal X to electric pushrod
124 constitute transmitting terminal X layers, and first sensor bracket 113 is fixed on transmitting terminal X on sliding block 122, and transmitting terminal X is sliding to sliding block 122
Dynamic to be socketed on transmitting terminal X direction guiding rail 121, transmitting terminal X direction guiding rail 121 and transmitting terminal X are fixed on transmitting terminal to electric pushrod 124
For X to frame 123, transmitting terminal X is sliding along transmitting terminal X direction guiding rail 121 to the extension end of electric pushrod 124 driving transmission antenna unit 11
It is dynamic；
Transmitting terminal Y-direction guide rail 125, transmitting terminal Y-direction sliding block 126, transmitting terminal Y-direction frame 127 and transmitting terminal Y-direction electric pushrod
128 constitute transmitting terminal Y layers, and transmitting terminal X is fixed on transmitting terminal Y-direction sliding block 126 to frame 123, and transmitting terminal Y-direction sliding block 126 is sliding
Dynamic to be socketed in transmitting terminal Y-direction guide rail 125, transmitting terminal Y-direction guide rail 125 and transmitting terminal Y-direction electric pushrod 128 are fixed on transmitting terminal Y
To on frame 127, the extension end of transmitting terminal Y-direction electric pushrod 128 is fixedly connected with transmitting terminal X to frame 123, passes through transmitting terminal
The flexible realization transmission antenna unit 11 of Y-direction electric pushrod 128 is slided along transmitting terminal Y-direction guide rail 125.
Transmission antenna unit 11 mounted thereto is allowed to move in a 2D plane by transmitting antenna mobile platform 12
It is dynamic, antenna alignment can be convenient for the horizontal position of flexibly adjustment transmission antenna unit 11.
As shown in fig. 6-7, microwave receiving end 2 includes receiving antenna unit 21 and receiving antenna mobile platform 22, receives day
Line unit 21 is mounted on receiving antenna mobile platform 22, provides the movement of XY both direction by receiving antenna mobile platform 22.
Receiving antenna unit 21 includes microwave antenna 211, transmitting terminal laser-correlation sensor 212 and second sensor bracket 213,
Second sensor bracket 213 is fixed to the two sides of microwave antenna 211 by antenna flange, and two transmitting terminal laser-correlations pass
Sensor 212 is respectively installed on the second sensor bracket 213 of 211 two sides of microwave antenna, microwave antenna 211 and hair
It penetrates end laser-correlation sensor 212 and has been combined into an entirety, transmitting terminal laser-correlation sensor 212 can reflect microwave receiving
The position of antenna 211.
The receiving antenna mobile platform 22 include receiving end X direction guiding rail 221, receiving end X to sliding block 222, receiving end X to
Frame 223, receiving end X are to electric pushrod 224, receiving end Y-direction guide rail 225, receiving end Y-direction sliding block 226, receiving end Y-direction frame
227, receiving end Y-direction electric pushrod 228 and receiving end ultrasonic distance-measuring sensor 229, receiving antenna mobile platform 22 is from space
On can be divided into receiving end X layers and receiving end Y layers, the distance between two layers is 43mm.
Receiving end X direction guiding rail 221, receiving end X are to sliding block 222, receiving end X to frame 223 and receiving end X to electric pushrod
224 constitute receiving end X layers, and second sensor bracket 213 is fixed on receiving end X on sliding block 222, and receiving end X is sliding to sliding block 222
Dynamic to be socketed on receiving end X direction guiding rail 221, receiving end X direction guiding rail 221 and receiving end X are fixed on receiving end to electric pushrod 224
For X to frame 223, receiving end X is sliding along receiving end X direction guiding rail 221 to the extension end of electric pushrod 224 driving receiving antenna unit 21
It is dynamic；
Receiving end Y-direction guide rail 225, receiving end Y-direction sliding block 226, receiving end Y-direction frame 227 and receiving end Y-direction electric pushrod
228 constitute receiving end Y layers, and receiving end X is fixed on receiving end Y-direction sliding block 226 to frame 223, and receiving end Y-direction sliding block 226 is sliding
Dynamic to be socketed in receiving end Y-direction guide rail 225, receiving end Y-direction guide rail 225 and receiving end Y-direction electric pushrod 228 are fixed on receiving end Y
To on frame 227, the extension end of receiving end Y-direction electric pushrod 228 is fixedly connected with receiving end X to frame 223, passes through receiving end
The flexible realization receiving antenna unit 21 of Y-direction electric pushrod 228 is slided along receiving end Y-direction guide rail 225.
Receiving antenna unit 21 is allowed to move in a 2D plane by receiving antenna mobile platform 22, it can be flexible
The horizontal position for adjusting receiving antenna unit 21, is convenient for antenna alignment.
As shown in figure 8, antenna hoistable platform 3 includes rack 31, Z-direction guide rail 32, Z-direction sliding block 33, mould loft floor 34, mould loft floor
Snap-gauge 35, transmitting terminal lifting push rod 36 and receiving end go up and down push rod 37.Rack 31 is the basis of antenna hoistable platform 3, be by
The space framework of aluminium alloy extrusions and connector composition, length, width and height are having a size of 780*380*1250mm；Four Z-direction guide rails 32 are installed
In the inside of 31 flash of rack, two-by-two relatively, eight Z-direction sliding blocks 33 thereon respectively with Microwave emission end 1 and microwave receiving end 2
It matches, allows the elevating movement on Z-direction guide rail 32 of Microwave emission end 1 and microwave receiving end 2；Mould loft floor 34 is located at Microwave emission
Measurement space between end 1 and microwave receiving end 2, is made of four blocks of side plates and one piece of lay out board, can place 500mm*500mm*
The sample to be tested of 120mm volume, surrounding are matched with the mould loft floor snap-gauge 35 for being mounted on 31 flash of rack；Four transmitting terminal liters
Drop push rod 36 is mounted on the top of rack 31, and fixing end is connected in the outside of 31 flash of rack, and extension end is connected by pin
The angle point of transmitting antenna mobile platform 12 into Microwave emission end 1 drives transmitting antenna mobile platform 12 along Z when extension end is stretched out
Direction guiding rail 32 moves downward, and Microwave emission end 1 declines, and drives transmitting antenna mobile platform 12 along Z-direction guide rail when extension end retracts
32 move upwards, and Microwave emission end 1 rises, and the stroke of four transmitting terminal lifting push rods 36 reaches 500mm, meet Microwave emission
Hold the requirement of 1 elevating movement；Four receiving end lifting push rods 37 are mounted on the lower part of rack 31, and fixing end is connected in rack 31
The outside of flash, extension end are connected to the angle point of receiving antenna mobile platform 22 in microwave receiving end 2 by pin, and extension end is stretched
Receiving antenna mobile platform 22 is driven to move upwards along Z-direction guide rail 32 when out, microwave receiving end 2 rises, band when extension end retracts
Dynamic receiving antenna mobile platform 22 is moved downward along Z-direction guide rail 32, and microwave receiving end 2 declines, and four receiving ends go up and down push rod 37
Stroke reach 500mm, meet the requirement of 2 elevating movement of microwave receiving end；To avoid transmitting terminal from going up and down push rod 36 and receiving
It is interfered between the movement of end lifting push rod 37, transmitting terminal goes up and down the fixing end installation of push rod 36 and receiving end lifting push rod 37
In the outside of 31 flash Different Plane of rack, mutually stagger.
As shown in figure 9, illustrating the connection type and phase at Microwave emission end 1 and microwave receiving end 2 with antenna hoistable platform 3
To position, as soon as foring a measurement space between Microwave emission end 1 and microwave receiving end 2, tested material is placed on this survey
In quantity space, Microwave emission end 1 is connected to antenna hoistable platform 3 by Z-direction sliding block 33 and Z-direction guide rail 32, is located at antenna and goes up and down
The lower half-space of platform 3, sample to be tested of 111 bore of microwave transmitting antenna facing towards top；Microwave receiving end 2 is sliding by Z-direction
Block 33 and Z-direction guide rail 32 are connected to antenna hoistable platform 3, positioned at the upper half-space of antenna hoistable platform 3, microwave antenna
Sample to be tested of 211 bores facing towards lower section；Four transmitting terminal lifting push rods 36 are mounted on the top of rack 31, and fixing end is solid
It is connected in the outside of 31 flash of rack, extension end is connected to the angle of transmitting antenna mobile platform 12 in Microwave emission end 1 by pin
Point drives 1 elevating movement of transmitting terminal；Four receiving end lifting push rods 37 are mounted on the lower part of rack 31, and fixing end is connected in
The outside of 31 flash of rack, extension end are connected to the angle point of receiving antenna mobile platform 22 in microwave receiving end 2, band by pin
Dynamic 2 elevating movement of microwave receiving end；Push rod 36 is gone up and down by transmitting terminal and receiving end goes up and down the adjustable Microwave emission of push rod 37
Antenna 111 arrives the detecting distance and the distance between microwave transmitting antenna 111 and microwave antenna 211 of tested material.
As shown in Figure 10, described control unit 4 includes embedded computer system 401, microcontroller 402, microwave signal
Generator 403, isolator 404, variable attenuator 405, the first directional coupler 406, circulator 407, the second directional coupler
408, third directional coupler 409, phase discriminator 410, first detector 411, second detector 412, third detector 413, A/D
Converter 414 and temperature sensor 415；Embedded computer system 401 is connected to microcontroller 402, microcontroller by bus
Device 402 is connected with microwave signal generator 403, microwave signal generator 403, isolator 404, variable attenuator 405 and first
Directional coupler 406 is sequentially connected, and the output end and coupled end of the first directional coupler 406 are separately connected circulator 407 and
Two directional couplers 408, circulator 407 are separately connected second detector 412 and the microwave transmitting antenna 111, the second orientation
The output end and coupled end of coupler 408 are separately connected first detector 411 and phase discriminator 410, third directional coupler 409
Output end and coupled end are separately connected third detector 413 and phase discriminator 410, and phase discriminator 410, first detector 411, second are examined
Wave device 412 and third detector 413 are connected to A/D converter 414, and A/D converter 414 and temperature sensor 415 are connected to micro-
Controller 402；Microwave sweep signal when 403 generation device of microwave signal generator measures；Isolator 404, variable attenuator
405, the first directional coupler 406, circulator 407, the second directional coupler 408 and third directional coupler 409 are that composition is micro-
The microwave device of wave access；First detector 411, second detector 412 and third detector 413 measure declining for microwave signal
Subtract, phase discriminator 410 measures the phase shift of microwave signal.Embedded computer system can use WaveShare company AM3358 type
Number product, but not limited to this；Microcontroller can use the product of ST company Nucleo model, but not limited to this；Microwave letter
Number generator can use the product of DS INSTRUMENTS company SG24000H model, but not limited to this.
The course of work of the invention:
1) antenna is automatically aligned to；Before measuring moisture content, need to complete the alignment between microwave sending and receiving antenna, to protect
The main lobe for demonstrate,proving two antenna beams is overlapped, and that realizes microwave signal stablizes transmission.
(1.1) the preliminary alignment of microwave antenna:
Microcontroller 402 controls the horizontal position that transmitting antenna mobile platform 12 adjusts microwave transmitting antenna 111, makes microwave
Transmitting antenna 111 is in the underface of mould loft floor 34, and two receiving end laser-correlation sensors 112 pass through two first respectively
Frame 113 is fixed to the two sides of microwave transmitting antenna 111, and receiving end laser-correlation sensor 112 can reflect microwave transmitting antenna
111 position；Two transmitting terminal laser-correlation sensors 212 are fixed to microwave receiving day by two second supports 213 respectively
The two sides of line 211, transmitting terminal laser-correlation sensor 212 can represent the position of microwave antenna 211；Transmitting terminal laser pair
It penetrates sensor 212 and emits low power laser signal to 112 direction of receiving end laser-correlation sensor, if receiving end laser-correlation
Sensor 112 can smoothly receive the low power laser signal of the transmitting of transmitting terminal laser-correlation sensor 212, receiving end laser pair
Any signal of microcontroller 402 would not be fed back to by penetrating sensor 112；If receiving end laser-correlation sensor 112 receives not
The low power laser signal emitted to transmitting terminal laser-correlation sensor 212, receiving end laser-correlation sensor 112 will be feedbacked to
402 1 low level signals of microcontroller, microcontroller 402 control and receive the constantly adjustment microwave receiving day of antenna mobile platform 22
Any signal is no longer fed back up to receiving end laser-correlation sensor 112 in the horizontal position of line 211, just completes microwave day at this time
The preliminary alignment of line；
(1.2) final alignment of microwave antenna:
Embedded computer system 401 sends commands to microcontroller 402, and microcontroller 402 controls microwave signal
It is P1 microwave signal that device 403, which generates initial power, and microwave signal is radiate by microwave transmitting antenna 111, then is connect by microwave
It receives antenna 211 to receive, is received back the microwave signal transmission come to third detector 413, third detector 413, which is measured, to be received back
Microwave signal power P 2 and the value is uploaded to microcontroller 402, microcontroller 402 calculates micro- according to the value of P1 and P2
Decaying A1 of the wave signal after microwave transmitting antenna 111 and microwave antenna 211, microcontroller 402 is by fries (Friis)
The theoretical value A2 of microwave signature attenuation is calculated in transmission formula, and microcontroller 402, which calculates microwave according to the value of A1 and A2, to be believed
Number decaying deviation D, if decaying deviation D is more than 3dB, microcontroller controls and receives the fine tuning microwave receiving of antenna mobile platform 22
The horizontal position of antenna 211, until decaying, deviation D is lower than 3dB, just completes the final alignment of microwave antenna at this time.
2) optimize swept-frequency signal；Embedded computer system 401 is arranged cereal moisture percentage according to the type of cereal to be measured and surveys
Measure the center measurement frequency f of device0With measurement frequency bandwidth BW, initial microwave sweep signal MSS, embedded computer are determined
System 401 sends commands to microcontroller 402, and the control microwave signal generator 403 of microcontroller 402 issues initial microwave and sweeps
Frequency signal MSS, microwave sweep signal MSS reach the first directional coupler 406 by isolator 404 and variable attenuator 405,
In all the way signal by the second directional coupler 408 reach first detector 411, another way signal by circulator 407 arrival
Second detector 412, first detector 411 and second detector 412 measure the input microwave signal power P of antenna respectivelyin
With reflected microwave signal power Pr, and by PinAnd PrValue be uploaded to microcontroller 402, microcontroller 402 calculates each measurement frequency
The reflection coefficient Γ and standing-wave ratio ρ of the lower microwave transmitting antenna 111 of point, the corresponding larger reflection coefficient Γ of the removal of microcontroller 402 and
The measurement frequency point of standing-wave ratio ρ, the microwave sweep signal MSS ' optimized.
3) measurement distance and antenna distance are adjusted；Obtain the area that measurement frequency has been determined that after microwave sweep signal MSS '
Between, combine antenna far field condition, measurement of water ratio result are representative and reduce these three conditions of spatial microwave transmission loss,
Determine microwave transmitting antenna 111 between the measurement distance and microwave transmitting antenna 111 and microwave antenna 211 of cereal to be measured
Distance.
(3.1) the microwave signal access of communication apparatus:
Embedded computer system 401 sends commands to microcontroller 402, and microcontroller 402 controls microwave signal
Device 403 generates microwave sweep signal MSS '；Microwave sweep signal MSS ' reaches the by isolator 404 and variable attenuator 405
One directional coupler 406, wherein signal is as incidence wave signal by the second directional coupler 408 arrival first detector all the way
411 and phase discriminator 410；Another way signal successively passes through circulator 407, microwave transmitting antenna 111, microwave as transmitted wave signal
Receiving antenna 211 and third directional coupler 409 reach third detector 413 and phase discriminator 410；From microwave transmitting antenna 111
The part signal of return reaches second detector 412 by circulator 407 as reflection wave signal；By first detector 411,
The response signal that two wave detectors 412, third detector 413 and phase discriminator 410 generate passes through A/D converter 414 and microcontroller
After 402 processing, it is uploaded to embedded computer system 401, the connection of finishing device microwave signal access；
(3.2) the minimum value d of detecting distance is determined according to far field conditionmin:
The radiated far field area of antenna be antenna actual use region, the amplitude of this region midfield with leave at a distance from antenna
Be inversely proportional, and the angle distribution (i.e. antenna radiation pattern) of field with leave it is unrelated at a distance from antenna, the main lobe of antenna radiation pattern, minor lobe and
Zero point has all been formed.The far field condition of antenna are as follows:
D is the full-size of 111 physics bore of microwave transmitting antenna in formula, and λ is the operation wavelength of microwave, and r is tested pair
The distance of image distance microwave transmitting antenna 111；The minimum value d of far field condition requirement detecting distancemin=rmin=2D2/λ；It is embedded
Computer system 401 calculates the operation wavelength λ of microwave according to the working frequency f of current microwave, then determines detection by far field condition
The minimum value d of distancemin, record dminValue and be transferred to microcontroller 402；
(3.3) the maximum value d of detecting distance is determined by moisture content testing result representative of conditionsmax:
In view of the representativeness of moisture content testing result, most of tested material is included in microwave radiation area
Guarantee the representativeness of moisture content testing result；Microwave beam width is determining under certain frequency, wide according to half power points wave beam
The width of degree and material to be measured calculates the detecting distance so that when all materials to be measured are included in the swept area of microwave,
Calculation formula are as follows:
W is the width of material to be measured in formula, and HPBW is half power points beam angle, and d is microwave transmitting antenna 111 to be measured
The detecting distance of material；Continue to increase detecting distance, microwave can be applied to non-material to be measured and introduce noise, and can aggravate micro-
Wave leakage, so can determine the maximum value d of detecting distance by formula (2)max；Embedded computer system 401 inquires built-in parameter
Table obtains the half power points beam angle HPBW of microwave transmitting antenna 111 under current microwave operational frequencies, calculates further according to formula (2)
The maximum value d of detecting distancemax, record dmaxValue and be transferred to microcontroller 402；
(3.4) by reduction spatial microwave transmission loss Step wise approximation (dmin,dmax) in optimal detection distance dbest:
The calculating of spatial microwave transmission loss needs to use fries (Friis) transmission formula in antenna theory, specifically
Formula is as follows:
P in formulaRIt is the output power of microwave antenna 211, PTIt is the input power of microwave transmitting antenna 111, GTIt is micro-
The gain of wave transmitting antenna 111, GRIt is the gain of microwave antenna 211, R represents transmission range i.e. twice of detecting distance,
The detecting distance d that microcontroller 402 is measured according to transmitting terminal ultrasonic distance-measuring sensor 129, control transmitting terminal go up and down push rod 36
The vertical position at de-regulation Microwave emission end 1, until detecting distance reaches its maximum value dmax；Microcontroller 402 is turned by A/D
Parallel operation 408 reads first detector 411 and the measurement result of second detector 412 calculates PT, read third detector 413
Measurement result calculates PR, then by PTAnd PRCalculate spatial microwave transmission loss；Friis transmission formula is pointed out, transmission distance is reduced
From the effective ways for being reduction spatial microwave transmission loss；Microcontroller 402 controls transmitting terminal lifting push rod 36 and retracts, and drives micro-
Wave transmitting terminal 1 rises, and reduces detecting distance by stepping of 1cm, and transmission range can reduce therewith reduces spatial microwave transmission loss,
Current detection is calculated apart from lower spatial microwave transmission loss and its change rate by the above process；This process is repeated until microwave
Space transmission loss change rate is less than 1%, it is believed that detecting distance at this time is optimal detection distance dbest；If working as detecting distance
It is decreased to dminWhen, PRReduce variation with detecting distance and is still not less than 1%, then the d determined Antenna Far Field conditionminAs
Optimal detection distance dbest.It should be noted that microcontroller 402 can adjust microwave hair simultaneously in detecting distance adjustment process
The position for penetrating end 1 and microwave receiving end 2 makes the two be arranged symmetrically in the two sides up and down of material to be measured.
4) cereal moisture percentage is measured
(4.1) it loads cereal to be measured and measures cereal thickness h:
It loads the preceding receiving end ultrasonic distance-measuring sensor 229 of cereal to be measured and measures microwave receiving end 2 to mould loft floor 34
Distance h1And microcontroller 402 is uploaded, cereal to be measured is entirely placed on the mould loft floor 34 in measurement space, is loaded to be measured
Receiving end ultrasonic distance-measuring sensor 229 measures the distance h that cereal surface to be measured is arrived at microwave receiving end 2 after cereal2And it uploads
Microcontroller 402, microcontroller 402 is by h1With h2Difference obtain cereal thickness h and upload embedded computer system 401；
(4.2) emit microwave sweep signal MSS '
Embedded computer system 401 sends commands to microcontroller 402, and microcontroller 402 controls microwave signal
Device 403 generates microwave sweep signal MSS '；Microwave sweep signal MSS ' reaches the by isolator 404 and variable attenuator 405
One directional coupler 406, wherein signal is as reference signal by the second directional coupler 408 arrival first detector all the way
411 and phase discriminator 410；Another way signal is radiated measurement space by circulator 407 and microwave transmitting antenna 111, across putting
Cereal to be measured and cereal to be measured in sample platform 34 interact, and carry the transmission microwave signal of grain moisture information to be measured by micro-
Wave receiving antenna 211 and third directional coupler 409 reach third detector 413 and phase discriminator 410；From microwave transmitting antenna
111 part signals returned reach second detector 412 by circulator 407 as reflection wave signal；By first detector
411, the response signal that second detector 412, third detector 413 and phase discriminator 410 generate is uploaded by A/D converter 414
To microcontroller 402；
(4.3) the decaying A and phase shift phi of microwave sweep signal MSS ' are measured
First detector 411, second detector 412 and third detector 413 measure the microwave signal function of input respectively
Rate Pin, reflected microwave signal power PrWith transmission microwave signal power Pt, and it is uploaded to microcontroller 402, microcontroller 402
The decaying A of signal under each frequency point of microwave sweep signal MSS ' is calculated according to formula (4):
Microcontroller 402 considers the influence of reflected microwave signal when calculating microwave attenuation A, does not consider reflected microwave signal
Pad value when influence is bigger than true microwave attenuation A, causes the cereal moisture percentage of measurement bigger than normal.Input microwave signal and thoroughly
Microwave signal transmission is penetrated to phase discriminator 410, phase discriminator 410 carries out phase bit comparison to two microwave signals, obtains the phase shift of microwave
Φ:
Wherein VIAnd VQIt is the voltage signal of the reflection two microwave signal phases difference of phase discriminator (410) output；VIAnd VQPass through
A/D converter 414 is uploaded to microcontroller 402, and microcontroller 402 calculates the phase shift phi of microwave according to formula (5).Microcontroller
The decaying A of the microwave sweep signal MSS ' measured and phase shift phi are uploaded to embedded computer system 401 by 402；
(4.4) cereal moisture percentage to be measured is calculated
A large amount of calibration experiment is carried out for different types of cereal to be measured, obtains cereal to be measured under different water cut,
Decaying A and phase shift phi, the measurement data of environment temperature T and cereal thickness h of the microwave sweep signal MSS ' after cereal to be measured,
By the decaying A and phase shift phi and environment temperature T and cereal thickness h constitutive characteristic under each measurement frequency point of microwave sweep signal MSS '
Matrix utilizes machine learning algorithm training on the data set that eigenmatrix and label are constituted using cereal moisture percentage as label
Cereal moisture percentage prediction model, it is micro- by the configuration of trained cereal moisture percentage prediction model in embedded computer system 401
Controller 402 is thick by decaying A and phase shift phi, the environment temperature T and cereal under each measurement frequency point of microwave sweep signal MSS '
The measurement data of degree h is uploaded to embedded computer system 401, and embedded computer system 401 calls built-in cereal aqueous
Rate prediction model calculates the moisture content of current cereal to be measured.
Claims (8)
1. a kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method, it is characterised in that: including Microwave emission end
(1), microwave receiving end (2), antenna hoistable platform (3) and control unit (4) etc.；Microwave emission end (1) is slidably arranged in antenna
The lower half-space of hoistable platform (3) provides the movement of Z-direction by antenna hoistable platform (3)；Microwave receiving end (2) sliding is set
The upper half-space in antenna hoistable platform (3) is set, provides the movement of Z-direction by antenna hoistable platform (3)；Microwave emission end
(1), microwave receiving end (2) and antenna hoistable platform (3) are controlled by control unit (4), and Microwave emission end (1) is micro- for emitting
The position of wave signal and adjusting microwave transmitting antenna in the xy plane, microwave receiving end (2) are used for receive microwave signal and adjusting
The position of microwave antenna in the xy plane, antenna hoistable platform (3) is for adjusting Microwave emission end (1) and microwave receiving end
(2) make device work in optimal detecting distance in the position of Z-direction, control unit (4) is according to Microwave emission end (1) and micro-
The signal of wave receiving end (2) feedback calculates the decaying A and phase shift phi of microwave signal, and it is aqueous that input control unit (4) measures cereal
Rate.
2. a kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method according to claim 1, feature exist
In the Microwave emission end (1) includes transmission antenna unit (11) and transmitting antenna mobile platform (12)；Transmission antenna unit
(11) transmitting antenna mobile platform (12) are mounted in, provide the movement of XY both direction by transmitting antenna mobile platform (12)；Institute
Stating transmission antenna unit (11) includes microwave transmitting antenna (111), receiving end laser-correlation sensor (112) and first sensor
Bracket (113), receiving end laser-correlation sensor (112) pass through first sensor bracket (113) and microwave transmitting antenna (111)
It is combined into an entirety, the position of reflected microwave transmitting antenna (111).
3. a kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method according to claim 2, feature exist
In, the transmitting antenna mobile platform (12) include transmitting terminal X direction guiding rail (121), transmitting terminal X to sliding block (122), transmitting terminal X
To frame (123), transmitting terminal X to electric pushrod (124), transmitting terminal Y-direction guide rail (125), transmitting terminal Y-direction sliding block (126), emit
Y-direction frame (127), transmitting terminal Y-direction electric pushrod (128) and transmitting terminal ultrasonic distance-measuring sensor (129) are held, transmitting antenna moves
Moving platform (12) is from can spatially be divided into X layers of transmitting terminal and transmitting terminal Y layers, and transmitting terminal X direction guiding rail (121), transmitting terminal X are to sliding block
(122), transmitting terminal X constitutes transmitting terminal X layers to frame (123) and transmitting terminal X to electric pushrod (124), first sensor bracket
(113) transmitting terminal X is fixed on on sliding block (122), and transmitting terminal X is slidably socketed to sliding block (122) in transmitting terminal X direction guiding rail
(121) on, transmitting terminal X direction guiding rail (121) and transmitting terminal X are fixed on transmitting terminal X to frame (123), hair to electric pushrod (124)
It penetrates end X and is slided to the extension end of electric pushrod (124) driving transmission antenna unit (11) along transmitting terminal X direction guiding rail (121)；
Transmitting terminal Y-direction guide rail (125), transmitting terminal Y-direction sliding block (126), transmitting terminal Y-direction frame (127) and transmitting terminal Y-direction is electronic pushes away
Bar (128) constitutes transmitting terminal Y layers, and transmitting terminal X is fixed on transmitting terminal Y-direction sliding block (126) to frame (123), and transmitting terminal Y-direction is sliding
Block (126) is slidably socketed in transmitting terminal Y-direction guide rail (125), transmitting terminal Y-direction guide rail (125) and transmitting terminal Y-direction electric pushrod
(128) it is fixed on transmitting terminal Y-direction frame (127), the extension end of transmitting terminal Y-direction electric pushrod (128) and transmitting terminal X are to frame
(123) it is fixedly connected, by the flexible realization transmission antenna unit (11) of transmitting terminal Y-direction electric pushrod (128) along transmitting terminal Y-direction
Guide rail (125) sliding, transmitting terminal ultrasonic distance-measuring sensor (129) is mounted on transmitting terminal Y-direction frame (127), for detecting
The detecting distance of microwave transmitting antenna (111) away from cereal to be measured.
4. a kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method according to claim 2, feature exist
In the microwave receiving end (2) includes receiving antenna unit (21) and receiving antenna mobile platform (22)；Receiving antenna unit
(21) receiving antenna mobile platform (22) are mounted in, provide the movement of XY both direction by receiving antenna mobile platform (22)；Institute
Stating receiving antenna unit (21) includes microwave antenna (211), transmitting terminal laser-correlation sensor (212) and second sensor
Bracket (213), transmitting terminal laser-correlation sensor (212) pass through second sensor bracket (213) and microwave antenna (211)
It is combined into an entirety, represents the position of microwave antenna (211).
5. a kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method according to claim 4, feature exist
In, the receiving antenna mobile platform (22) include receiving end X direction guiding rail (221), receiving end X to sliding block (222), receiving end X
To frame (223), receiving end X to electric pushrod (224), receiving end Y-direction guide rail (225), receiving end Y-direction sliding block (226), receive
Y-direction frame (227), receiving end Y-direction electric pushrod (228) and receiving end ultrasonic distance-measuring sensor (229) are held, receiving antenna moves
Moving platform (22) is from can spatially be divided into receiving end X layers and receiving end Y layers, and receiving end X direction guiding rail (221), receiving end X are to sliding block
(222), receiving end X constitutes receiving end X layers to frame (223) and receiving end X to electric pushrod (224), second sensor bracket
(213) receiving end X is fixed on on sliding block (222), and receiving end X is slidably socketed to sliding block (222) in receiving end X direction guiding rail
(221) on, receiving end X direction guiding rail (221) and receiving end X are fixed on receiving end X to frame (223) to electric pushrod (224), connect
Receiving end X is slided to the extension end of electric pushrod (224) driving receiving antenna unit (21) along receiving end X direction guiding rail (221)；
Receiving end Y-direction guide rail (225), receiving end Y-direction sliding block (226), receiving end Y-direction frame (227) and receiving end Y-direction is electronic pushes away
Bar (228) constitutes receiving end Y layers, and receiving end X is fixed on receiving end Y-direction sliding block (226) to frame (223), and receiving end Y-direction is sliding
Block (226) is slidably socketed in receiving end Y-direction guide rail (225), receiving end Y-direction guide rail (225) and receiving end Y-direction electric pushrod
(228) it is fixed on receiving end Y-direction frame (227), the extension end of receiving end Y-direction electric pushrod (228) and receiving end X are to frame
(223) it is fixedly connected, by the flexible realization receiving antenna unit (21) of receiving end Y-direction electric pushrod (228) along receiving end Y-direction
Guide rail (225) sliding, receiving end ultrasonic distance-measuring sensor (229) is mounted on receiving end Y-direction frame (227), for detecting
The distance of microwave antenna (211) away from cereal to be measured.
6. a kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method according to claim 1, feature exist
In, the antenna hoistable platform 3 include rack (31), Z-direction guide rail (32), Z-direction sliding block (33), transmitting terminal lifting push rod (34) and
Receiving end goes up and down push rod (35)；Z-direction guide rail (32) is mounted on the inside of rack (31) flash, and transmitting terminal goes up and down push rod (34) installation
On the top of rack (31), the extension end of transmitting terminal lifting push rod (34) is connect with transmitting antenna mobile platform (12), is driven micro-
Wave transmitting terminal (1) is moved up and down along Z-direction guide rail (32)；Receiving end lifting push rod (35) is mounted on the lower part of rack (31), connects
The extension end of receiving end lifting push rod (35) is connect with receiving antenna mobile platform (22), drives microwave receiving end (2) along Z-direction guide rail
(32) it moves up and down, the fixing end of transmitting terminal lifting push rod (34) and receiving end lifting push rod (35) is mounted on rack (31) height
The outside of side Different Plane, mutually staggers.
7. a kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method according to claim 1, feature exist
In: described control unit (4) includes embedded computer system (401), microcontroller (402), microwave signal generator
(403), isolator (404), variable attenuator (405), the first directional coupler (406), circulator (407), the second orientation coupling
Clutch (408), third directional coupler (409), phase discriminator (410), first detector (411), second detector (412),
Three wave detectors (413), A/D converter (414) and temperature sensor (415)；Embedded computer system (401) is connected by bus
It being connected to microcontroller (402), microcontroller (402) is connected with microwave signal generator (403), microwave signal generator (403),
Isolator (404), variable attenuator (405) and the first directional coupler (406) are sequentially connected, the first directional coupler (406)
Output end and coupled end be separately connected circulator (407) and the second directional coupler (408), circulator (407) is separately connected
Second detector (412) and the microwave transmitting antenna (111), the output end and coupled end point of the second directional coupler (408)
Not Lian Jie first detector (411) and phase discriminator (410), the output end and coupled end of third directional coupler (409) connect respectively
Connect third detector (413) and phase discriminator (410), phase discriminator (410), first detector (411), second detector (412) and
Third detector (413) is connected to A/D converter (414), and A/D converter (414) and temperature sensor (415) are connected to micro-control
Device (402) processed；Microwave sweep signal when microwave signal generator (403) generation device measures；Isolator (404) can be changed and decline
Subtract device (405), the first directional coupler (406), circulator (407), the second directional coupler (408) and third directional coupler
It (409) is the microwave device for constituting microwave access；First detector (411), second detector (412) and third detector
(413) decaying of microwave signal is measured, phase discriminator (410) measures the phase shift of microwave signal.
8. the cereal moisture percentage measuring device according to claim 1 based on frequency sweep microwave penetration method, it is characterised in that: institute
It states control unit (4) and uses the survey that amplitude is certain, microwave sweep signals of frequency consecutive variations in Measurement bandwidth are as device
Signal is measured, grain moisture information is more comprehensively obtained while inhibiting multipath reflection to influence；The centre frequency of swept-frequency signal
f0It is determined with Measurement bandwidth BW by the type of cereal, and swept-frequency signal is optimized according to the characterisitic parameter of microwave antenna, removal is not
Good frequency point, using the measuring signal that the swept-frequency signal after optimization is final as device.
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| JP7381142B2 (en) | 2020-06-15 | 2023-11-15 | 浙江大学 | Secondary frequency selection method and device for microwave sweep data |
| CN112097815A (en) * | 2020-08-21 | 2020-12-18 | 电子科技大学 | Scattering matrix parameter detection system for microwave sensing |
| CN112985546A (en) * | 2021-02-20 | 2021-06-18 | 重庆四联测控技术有限公司 | Automatic testing arrangement of level switch |
| CN114636394A (en) * | 2022-03-14 | 2022-06-17 | 苏州西热节能环保技术有限公司 | Online monitoring method for deformation risk of hyperbolic cooling tower and special system thereof |
| CN114636394B (en) * | 2022-03-14 | 2023-11-10 | 苏州西热节能环保技术有限公司 | Hyperbolic cooling tower deformation risk online monitoring method and special system thereof |
| WO2023221423A1 (en) * | 2022-05-20 | 2023-11-23 | 上海兰宝传感科技股份有限公司 | Microwave-based test device |
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