CN106643514A - Low-cost and high-accuracy plant height measuring system based on infrared photosensitive tube array - Google Patents
Low-cost and high-accuracy plant height measuring system based on infrared photosensitive tube array Download PDFInfo
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- CN106643514A CN106643514A CN201610818476.5A CN201610818476A CN106643514A CN 106643514 A CN106643514 A CN 106643514A CN 201610818476 A CN201610818476 A CN 201610818476A CN 106643514 A CN106643514 A CN 106643514A
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- plant height
- sensor
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- pipe
- measuring system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
The invention discloses a low-cost and high-accuracy plant height measuring system based on an infrared photosensitive tube array. The system is composed of a controller, a sensor height adjustment device, an external extended interface, a tube sensor array, a memory, a peripheral interface, a communication interface, and a power supply. The plant height information is acquired by a tube sensor array. Through the function modules, the plant height is accurately and quickly monitored online. The plant height measuring system of the invention has such advantages as high degree of intelligence, low cost, strong anti-interference ability and simple structure, and can be used to measure the plant heights of low and high plants online and in real time.
Description
Technical field
The present invention relates to it is a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array, belong to intelligence
Change agricultural mechanical field.
Background technology
Crop growing state information is to obtain the information such as crop alimentary situation, moisture, disease pest and weed, physiology and according to plant growth
Situation carries out the basis of scientific management and foundation to crop.At present, the facilities horticulture cultivation gross area of China is in the first in the world,
But the science and technology and overall development level of China's industrialized agriculture are low, the agricultural such as facilities horticulture environment conditioning level and Holland developed country
Compare that gap is larger, seriously hinder the high-efficient development of industrialized agriculture.Distinct issues be current Main Basiss greenhouse because
Son carries out greenhouse flower, does not account for the situation of plant growth and being actually needed for plant growth, does not accomplish precisely pipe
Reason, causes crop yield not high, and operation energy consumption is bigger than normal.According to the requirement of " high-quality, efficient, energy-conservation, low-carbon (LC), safety ", need to solve
Truly need to carry out water-fertilizer-pesticide dynamic control and integrated management according to plant growth.Plant height is that the key of crop growing state information refers to
One of mark, therefore, the plant height information for obtaining crop is very important link in the automatic management of farmland, is to realize that agricultural is modern
One of key technology of change.
Although the manually measurement degree of accuracy of plant height is high, time-consuming, laborious, the need of modern agricultural development can not be met
Will.In the prior art, some scholars utilize the reality of ultrasonic sensor, laser range sensor and machine vision to plant height
When monitoring carried out studying and achieving certain achievement.Paper 1《Performance evaluation of multiple
ground based sensors mounted on a commercial wild blueberry harvester to
sense plant height,fruit yield and topographic features in real-time》
(2013) ultrasonic sensor is installed to commercial open country blueberry by Computers and Electronics in Agriculture
The measurement of plant height is studied on cropper, is as a result shown:The voltage output of ultrasonic sensor and the manual survey of plant height
Value is significantly correlated;Paper 2《Plant height estimation using two sensing systems》(ASAE
Annual international meeting, 2012) merge three-dimensional machine vision and supersonic sensing, and corn plant height is carried out
Research, yet with sensitiveness to environmental disturbances (such as edaphic condition, intensity of illumination, canopy shape and color), limits
Application of the machine vision in production practices.The master that ultrasonic sensor and laser range sensor face in plant height measurement
Want a difficult problem to be that sensor is difficult to be directed at the stem portion of crop, cause certainty of measurement low.Paper 3《Terrestrial laser
scanning for plant height measurement and biomass estimation of maize》(J].The
International Archives of the Photogrammetry,Remote Sensing and Spatial
Information Sciences, 2011) are carried out using near-earth laser scanner technique to milpa plant height and biological quality
Measurement;Paper 4《Multi-temporal crop surface models derived from terrestrial laser
scanning for accurate plant height measurement and biomass estimation of
barley》(Proceedings of the Workshop on UAV-basaed Remote Sensing Methods for
MonitoringGeographische Arbeiten, 2014) with paper 5《Multitemporal
crop surface models:accurate plant height measurement and biomass estimation
with terrestrial laser scanning in paddy rice》(Journal of Applied Remote
Sensing, 2014) is studied barley and Plant Height of Rice respectively, and it is still not high enough that certainty of measurement reaches Centimeter Level, in addition this
The high three-dimensional laser scanner Riegl VZ-1000 of price are employed in two researchs, causes plant height monitoring system price high.
In sum, have to plant height real-time monitoring that price is high, the defect that certainty of measurement is low, antijamming capability is weak at present, in the urgent need to
Research and develop the strong plant height real time monitoring of low cost, high accuracy, anti-interference (especially ambient lighting) ability and device to make up.
Paper 6《3YDX-3 types tobacco topping sprout-inhibiting machine is designed》(EI, 2010) in disclose one kind and be based on
The photosensitive tobacco plant height detecting system to pipe, the system using 16 pairs it is photosensitive pipe is measured to tobacco plant height, 16 pairs are photosensitive
Distance is arranged on to pipe on two opposite brackets of 200mm, 8 transmitting tubes and 8 reception pipes to be installed on each support, according to
Transmitting tube and reception pipe staggered pattern are installed, i.e., transmitting tube-reception pipe --- transmitting tube ... reception pipe mode is arranged,
On same support, the distance of adjacent two pairs of pipes is 20mm, relevant position is installed on one of support transmitting tube and another
The reception pipe installed on the identical height of support is corresponding, and the weak point of the system is:Due to installing adjacent two pairs on same support
The distance of pipe is 20mm, causes Measurement Resolution to be 20mm, and certainty of measurement is relatively low.Paper 7《Intelligent tobacco topping sprout-inhibiting machine is controlled
System》Disclosed in tobacco height measuring system, using by 15 integrate receive and transmission unrestrained emission-type infrared electro
Sensor, 15 sensors are fixedly mounted on a vertical rack into row " one " word and arrange, but due between adjacent sensors
Distance be only 20mm, however it remains the low defect of the certainty of measurement of paper 6, additionally, due to sensor exist a larger reflection
Angle, causing the reflected signal of a sensor may be received by other sensors, so as to cause the increase of plant height measure error.
The content of the invention
It is an object of the invention to provide plant that the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array is based on,
To realize quick, online, real-time acquisition plant height information, improve intelligent, reduces cost improves precision, the anti-external environment of lifting
Interference performance, increases the scope of application, makes easy for installation.
In order to solve above technical problem, the present invention is using the infrared photosensitive array to pipe composition of the 151 pairs of correlations to strain
Height is detected that concrete technical scheme is as follows:
It is a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array, including:Controller motherboard
(4), sensor height adjusting means (5), external expansion interface (6), to tube sensor array (7), memory (8), communication connect
Mouth (9), Peripheral Interface (10) and power supply (11);Characterized by further comprising:Power supply (11), memory (8), communication interface (9),
Peripheral Interface (10) is joined directly together with controller motherboard (4);To tube sensor array (7) by external expansion interface (6)
It is connected with controller motherboard (4);One end of sensor height adjusting means (5) is mechanically connected with tube sensor array (7), separately
One end is electrically connected with controller (25).
It is described infrared photosensitive by 151 pairs of correlations being welded on circuit board A and circuit board B to tube sensor array (7)
Pipe is constituted;The photosensitive pairing by transmitting tube (1) and reception pipe (2) to pipe forms;Two pieces of circuit board sizes size phase
Together, the reception pipe (2) of crop (3) both sides, the transmitting tube (1) on circuit board A and circuit board B relevant positions is arranged on when using
One is mounted opposite and keeps straight line;10 row are respectively welded on circuit board A and circuit board B to tube sensor, adjacent two
Sensor spacing is 15mm, and first row is provided with 16 sensors, and the spacing per two neighboring sensor is 20mm, and 16 pass
The effective range of sensor is 300mm;From the beginning of the 2nd row, each column sensor mounting location 2mm lower than previous column successively, same row
The distance between two sensorses are 20mm;Each column or adjacent two sensor are according to transmitting tube-reception pipe-transmitting tube-connect
The order of closed tube ... is staggered installation of.
Described external expansion interface (6) includes decoder (12), address latch (13) and parallel interface chip (14)
Composition, parallel interface chip (14) is connected by decoder (12) with address latch (13) with controller (25).
The Peripheral Interface (10) includes motor driver (20), stepper motor (21), display (18) and keyboard (19);
Display (18) and keyboard (19) are joined directly together respectively with controller (25), stepper motor (21) by motor driver (20) with
Controller (25) connects.
The communication interface (9) includes wireless sending module (15), wireless receiving module (16) and PC (17), wireless to send out
Module (15) is sent to be connected with controller (25), wireless receiving module (16) is connected with PC (17), PC (17) and controller
(25) being wirelessly transferred for data and control command is carried out by wireless sending module (15) and wireless receiving module (16) between.
The sensor height adjusting means (5) is by stepper motor (21), roller (22), motor driver (20), guide rail
Slide block mechanism (24), steel wire rope (23), support (26) and drag link (27) composition;Stepper motor (21) and roller (22) are by subtracting
Fast device is connected, and three is each attached on support (26), and one end of steel wire rope (23) is connected with roller (22), and the other end is connected
Drag link (27) to tube sensor array (7);The left and right two ends of drag link (27) are respectively with the two of guide rail slide block mechanism (24)
Slide block connects;The upper end of drag link (27) is connected with steel wire rope (23), lower end with tube sensor array (7) is connected.
The stepper motor (21) and motor driver (20) are respectively the long wind turbine Co., Ltd production in Changzhou
86BYGH450C-02 types stepper motor and CF20611D drivers.
Described wireless sending module (15) and wireless receiving module (16) is the life of Shenzhen Jie Xunyilian Science and Technology Ltd.s
The YL-100IL type radio receiving transmitting modules of product.
Described decoder (12) and address latch (13) is respectively 74LS138 decoders and 74LS373 address latches
Device.
The 8255A chips that described parallel interface chip (14) is produced for atmel corp.
Described display (18) is LCD12864 liquid crystal displays.
Described keyboard (19) is the matrix keyboard of the row of 4 row 4.
Described roller (22) is the stainless steel roller of a diameter of 40mm, is connected with one end of steel wire rope.
Controller AT89S52 (4) and respective peripheral circuit that described controller motherboard (4) is produced by atmel corp
Composition.
Described magnetic valve (7) from 6013 type direct-acting electromagnetic valve high-speed switch electromagnetic valves, connect shower nozzle, separately by one end
One termination corresponding spray boom area sprays flow sensor.
The 24C64 that described memory (8) is produced for atmel corp.
Described correlation is infrared photosensitive red for the FBCB30 type correlations of Shenzhen Photoelectric Co., Ltd. of Hang Seng production to pipe
It is outer photosensitive to pipe.
The present invention has beneficial effect.
(1) it is of the invention in the detection to plant height tube sensor to be detected to plant height using photosensitive, without utilizing
The measuring method of machine vision, ultrasonic sensor and laser range sensor, had both avoided machine vision method and had easily received environment
The impact of factor especially illumination, solves ultrasonic sensor and laser range sensor is difficult to be directed at plant stem portion again
The problem of extreme higher position, improves certainty of measurement and antijamming capability, reduces cost.And machine vision, supersonic sensing (2)
Device is compared with the measuring method of laser range sensor, the present invention use it is photosensitive tube sensor cost is substantially reduced, have
The advantage of low cost.
Description of the drawings
Fig. 1 is the hardware circuit schematic diagram of plant height measuring system of the present invention;
Fig. 2 a are the infrared photosensitive front view to pipe arrangement of the present invention;
Fig. 2 b are the infrared photosensitive A to pipe arrangement of the present invention to side view;
Fig. 3 is the controller architecture schematic diagram of plant height measuring system of the present invention;
Fig. 4 is plant height sensor height adjusting means schematic diagram of the present invention;
Fig. 5 is plant height Survey Software flow chart of the present invention;
Fig. 6 is plant height measuring system result of the test figure of the present invention.
Wherein:1- transmitting tubes;2- reception pipes;3- crops;4- controller motherboards;5- sensor height adjusting meanss;6-
External expansion interface;7- is to tube sensor array;8- memories;9- communication interfaces;10- Peripheral Interfaces;11- power supplys;12- is decoded
Device;13- address latch;14- parallel interface chips;15- wireless sending modules;16- wireless receiving modules;17-PC machines;18-
Display;19- keyboards;20- motor drivers;21- stepper motors;22- rollers;23- steel wire ropes;24- guide rail slide blocks mechanism;
25- controllers;26- supports;27- drag links.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, technical scheme is described in further details.
As shown in figure 1, the present invention adopt based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array
Including:Controller motherboard 4, sensor height adjusting means 5, external expansion interface 6, to tube sensor array 7, memory 8,
Communication interface 9, Peripheral Interface 10 and power supply 11.Power supply 11, memory 8, communication interface 9, Peripheral Interface 10 and controller main frame
Plate 4 is joined directly together;Tube sensor array 7 is connected by external expansion interface 6 with controller motherboard 4;Sensor height is adjusted
The one end of regulating device 5 with tube sensor array 7 is mechanically connected, the other end is electrically connected with controller motherboard 25;
Described memory 8 is the 24C64 of atmel corp's production, for the storage to the plant height data for detecting.
As shown in Fig. 2 infrared photosensitive right by 151 pairs of correlations being welded on two pieces of circuit boards to tube sensor array 7
Pipe is constituted;It is photosensitive that pipe is formed by transmitting tube 1 and the pairing of reception pipe 2;Two pieces of circuit board size sizes are identical, are arranged on when using
The both sides of plant 3, the transmitting tube 1 on one of circuit board is relative one by one with the reception pipe 2 of other one piece of circuit board relevant position
Install and keep straight line;10 row are welded with each piece of circuit board to tube sensor, adjacent two sensors spacing is
15mm, first row is provided with 16 sensors, per two neighboring sensor spacing be 20mm, the effective range of 16 sensors
For 300mm;From the beginning of the 2nd row, each column sensor mounting location 2mm lower than previous column successively, between same row two sensorses
Distance is 20mm;Each column or adjacent two sensor according to transmitting tube-reception pipe-transmitting tube-reception pipe ... order
It is staggered installation of;
Correlation is infrared photosensitive infrared photosensitive for the FBCB30 type correlations of Shenzhen Photoelectric Co., Ltd. of Hang Seng production to pipe
To pipe.
As shown in figure 3, the controller AT89S52 4 that produced by atmel corp of controller motherboard and respective peripheral circuit
Composition;
Described external expansion interface 6 is constituted including decoder 12, address latch 13 and parallel interface chip 14, parallel
Interface chip 14 is connected by decoder 12 with address latch 13 with controller 25;
Described decoder 12 and address latch 13 is respectively 74LS138 decoders and 74LS373 address latch;
Described parallel interface chip 14 is the 8255A chips of atmel corp's production;
Described Peripheral Interface includes motor driver 20, stepper motor 21, display 18 and keyboard 19;The He of display 18
Keyboard 19 is joined directly together respectively with controller 25, and stepper motor 21 is connected by motor driver 20 with controller 25;
Described stepper motor 21 and motor driver 20 is respectively the long wind turbine Co., Ltd production in Changzhou
86BYGH450C-02 types stepper motor and CF20611D drivers, the two is used for the regulation to tube sensor array heights;
Described display 18 is LCD12864 liquid crystal displays;
Described keyboard 19 is the matrix keyboard of the row of 4 row 4;
Described communication interface includes wireless sending module 15, wireless receiving module 16 and PC 17, wireless sending module
15 are connected with controller 25, and wireless receiving module 16 is connected with PC 17, by wireless transmission between PC 17 and controller 25
Module 15 and wireless receiving module 16 carry out being wirelessly transferred for data and control command;
Described wireless sending module and wireless receiving module is the YL- that Shenzhen Jie Xunyilian Science and Technology Ltd.s produce
100IL type radio receiving transmitting modules.
As shown in figure 4, sensor height adjusting means is by stepper motor 21, roller 22, motor driver 20, guide rail slide block
Mechanism 24, steel wire rope 23, support 26 and drag link 27 are constituted;Stepper motor 21 is connected with roller 22 by decelerator, San Zhejun
It is fixed on support 26, the one end of steel wire rope 23 is connected with roller 22, the other end is connected to the fixed horizontal drawing to tube sensor array 7
Bar 27;The left and right two ends of drag link 27 are connected respectively with two slide blocks of guide rail slide block mechanism 24, and upper end is connected with steel wire rope 23, under
Hold and tube sensor array 7 is connected;
Described roller 22 is the stainless steel roller of a diameter of 40mm, is fixed on support 26, connects with one end of steel wire rope
Connect;
Fig. 5 is plant height Survey Software flow chart:Sample signal collection is carried out first, is calculated according to the sample signal of collection and is worked as
Front relative altitude hi, by hiRelative altitude h of last time collectioni-1It is compared, if hi>hi-1, then plant height H=hi, otherwise H=
hi-1.Finally judge hiWhether it is 0, if 0, then terminate, otherwise come back for the collection of next round sample signal.
Fig. 6 is shown between the actual measured value of plant height and predicted value has good linear relationship, it is demonstrated experimentally that this
The measurement absolute error of bright involved plant height measuring system is ± 4mm.
The course of work of the present invention is as follows:Invention system is articulated in into tractor or mobile platform, by sensor height
Adjusting means 5 adjusts the height and position to tube sensor array 7, makes plant peak the 300mm's to tube sensor array 7
Measured with adapting to the plant height to differing heights plant in sensitive range, start tractor or mobile platform so that plant height measurement system
System is advanced along plant row under tractor or mobile platform effect with certain speed, while opening controller motherboard 4 is with one
The fixed sampling period gathers plant height information and carries out plant height calculating, and the plant height of acquisition shows on display 18 or be stored in storage
In device 8, the data message for storing in the memory 8 is sent out plant height data by wireless sending module 15 and wireless receiving module 16
It is sent to PC 17 to treat further analysis and record, so as to realize real-time, quick, online, the accurate measurement to plant height.
It is last it should be noted that above example is only unrestricted to illustrate technical scheme, with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified and equivalent, and without deviating from the spirit and scope of technical solution of the present invention, it all should cover at this
In bright right.
Claims (10)
1. a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array, including:Controller motherboard
(4), sensor height adjusting means (5), external expansion interface (6), to tube sensor array (7), memory (8), communication connect
Mouth (9), Peripheral Interface (10) and power supply (11);Characterized by further comprising:Power supply (11), memory (8), communication interface (9),
Peripheral Interface (10) is joined directly together with controller motherboard (4);To tube sensor array (7) by external expansion interface (6)
It is connected with controller motherboard (4);One end of sensor height adjusting means (5) is mechanically connected with tube sensor array (7), separately
One end is electrically connected with controller (25).
2. according to claim 1 a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array,
It is characterized in that:It is described to tube sensor array (7) by 151 pairs of correlation infrared lights being welded on circuit board A and circuit board B
It is quick that pipe is constituted;The photosensitive pairing by transmitting tube (1) and reception pipe (2) to pipe forms;Two pieces of circuit board size sizes
It is identical, the reception pipe (2) of crop (3) both sides, the transmitting tube (1) on circuit board A and circuit board B relevant positions is arranged on when using
Straight line is mounted opposite and kept one by one;10 row are respectively welded on circuit board A and circuit board B to tube sensor, it is adjacent
Two sensor spacing are 15mm, and first row is provided with 16 sensors, and the spacing per two neighboring sensor is 20mm, 16
The effective range of sensor is 300mm;From the beginning of the 2nd row, each column sensor mounting location 2mm lower than previous column successively is same
The distance between row two sensorses are 20mm;Each column or adjacent two sensor according to transmitting tube-reception pipe-transmitting tube-
The order of reception pipe ... is staggered installation of.
3. according to claim 1 a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array,
It is characterized in that:Described external expansion interface (6) includes decoder (12), address latch (13) and parallel interface chip
(14) constitute, parallel interface chip (14) is connected by decoder (12) with address latch (13) with controller (25).
4. according to claim 1 a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array,
It is characterized in that:The Peripheral Interface (10) includes motor driver (20), stepper motor (21), display (18) and keyboard
(19);Display (18) and keyboard (19) are joined directly together respectively with controller (25), and stepper motor (21) is by motor driver
(20) it is connected with controller (25).
5. according to claim 1 a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array,
It is characterized in that:The communication interface (9) includes wireless sending module (15), wireless receiving module (16) and PC (17), nothing
Line sending module (15) is connected with controller (25), and wireless receiving module (16) is connected with PC (17), PC (17) and control
Being wirelessly transferred for data and control command is carried out by wireless sending module (15) and wireless receiving module (16) between device (25).
6. according to claim 1 a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array,
It is characterized in that:The sensor height adjusting means (5) by stepper motor (21), roller (22), motor driver (20), lead
Rail slide block mechanism (24), steel wire rope (23), support (26) and drag link (27) composition;Stepper motor (21) and roller (22) pass through
Decelerator is connected, and three is each attached on support (26), and one end of steel wire rope (23) is connected with roller (22), and other end connection is solid
The fixed drag link (27) to tube sensor array (7);The left and right two ends of drag link (27) respectively with guide rail slide block mechanism (24)
Two slide blocks connect;The upper end of drag link (27) is connected with steel wire rope (23), lower end with tube sensor array (7) is connected.
7. a kind of based on the infrared photosensitive low-cost and high-precision plant height measurement system to pipe array according to claim 1 and 3
System, it is characterised in that:Described decoder (12) and address latch (13) is respectively 74LS138 decoders and 74LS373 ground
Location latch.
8. a kind of based on the infrared photosensitive low-cost and high-precision plant height measurement system to pipe array according to claim 1 or 4
System, it is characterised in that:Described keyboard (19) is the matrix keyboard of the row of 4 row 4.
9. according to claim 1 a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array,
It is characterized in that:Described roller (22) is the stainless steel roller of a diameter of 40mm, is connected with one end of steel wire rope.
10. according to claim 1 a kind of based on the infrared photosensitive low-cost and high-precision plant height measuring system to pipe array,
It is characterized in that:Described magnetic valve (7) from 6013 type direct-acting electromagnetic valve high-speed switch electromagnetic valves, connect and spray by one end
Head, another termination corresponding spray boom area sprays flow sensor.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107727138A (en) * | 2017-09-25 | 2018-02-23 | 淮安生物工程高等职业学校 | Home farm's environmental monitoring system |
CN108981589A (en) * | 2018-06-05 | 2018-12-11 | 东南大学 | A kind of device and method for measuring cup open height |
CN108981588A (en) * | 2018-06-05 | 2018-12-11 | 东南大学 | A kind of measuring device and measuring method of rim of a cup height |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107727138A (en) * | 2017-09-25 | 2018-02-23 | 淮安生物工程高等职业学校 | Home farm's environmental monitoring system |
CN108981589A (en) * | 2018-06-05 | 2018-12-11 | 东南大学 | A kind of device and method for measuring cup open height |
CN108981588A (en) * | 2018-06-05 | 2018-12-11 | 东南大学 | A kind of measuring device and measuring method of rim of a cup height |
CN108981589B (en) * | 2018-06-05 | 2021-04-27 | 东南大学 | Device and method for measuring cup rim height |
CN108981588B (en) * | 2018-06-05 | 2021-04-27 | 东南大学 | Cup opening height measuring device and measuring method |
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