CN105548282A - Water content measuring instrument for grain - Google Patents
Water content measuring instrument for grain Download PDFInfo
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- CN105548282A CN105548282A CN201510901044.6A CN201510901044A CN105548282A CN 105548282 A CN105548282 A CN 105548282A CN 201510901044 A CN201510901044 A CN 201510901044A CN 105548282 A CN105548282 A CN 105548282A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
Abstract
The invention provides a water content measuring instrument for grain. The water content detector comprises a capacitance sensor and a temperature detector for detecting dielectric constant and temperature of grain, respectively, a control module for receiving measurement results from the capacitance sensor and the temperature detector and calculating the water content of grain particles, an input and display module, and a power-supply module for supplying power to the detector. The capacitance sensor includes a measurement container for containing to-be-detected grain particles and a measuring board, a front side of which is opposite to a bottom board of the container and is externally attached to the bottom board, and which is used for recognizing dielectric constant of the grain particles in the container. The front side of the measuring board is provided with an annular emission electrode and a reception electrode surrounding the emission electrode; a gap is formed between the emission electrode and the reception electrode; and a measurement electric field is generated between the two electrodes from the emission electrode to the reception electrode. The measuring instrument can detect water contents of grain having different water contents and has a high detection precision.
Description
Technical field
The present invention relates to grain processing instrument field, specifically, the present invention relates to the grain ' s moisture teller based on plane capacitance.
Background technology
The moisture of grain evaluates the important indicator of grain quality, therefore, grain measurement of moisture content to the purchase of grain, transport, storage, processing trade all tool be of great significance.Moisture is too high, and grain vital movement can be impelled vigorous, easily causes grain to generate heat, goes mouldy, infested and other Biochemical changes, affects finished product of grain output.And grain moisture content is too low, then decreases grain weight, affect grain quality, decrease total price that grain is final.
Existing grain measurement of moisture content method mainly contains Oven Method, electric-resistivity method, capacitance method, Near-Infrared Absorption Method, microwave method etc.
The detection of grain moisture take Oven Method as standard, and widespread use is that (4g pulverizes sample to ISO712, oven drying 130 DEG C in the world, 2h), this method is measured accurately, but sense cycle is long, and need to carry out fragmentation to cereal, cause waste to a certain extent.
Electric-resistivity method is the difference utilizing Measurement for Grain Moisture Content, the principle that its conductance is different, indirectly reflects its moisture by the change detecting cereal resistance value.But this method needs to carry out fragmentation to tested grain, causes waste to a certain extent.
Capacitance method, Near-Infrared Absorption Method and microwave method all belong to nondestructiving detecting means, but Near-Infrared Absorption Method is subject to the impact of the shape of tested material, size, density, and can not measure the moisture of internal batch.Microwave method is by the shape of tested material, the impact of density, and price is higher, is difficult to promote its application.And capacitance method is the specific inductive capacity being far longer than other compositions in grain according to the specific inductive capacity of moisture, the change of moisture certainly will cause the principle of electric capacitance change, by measuring the moisture of cereal capacitance indirect calculation grain.Compare mutually, the advantages such as the instrument of capacitance measurement has structure simply, cheap, easy to operate, apply relatively wide.
At present, domestic and international condenser type moisture detector, primarily of inside and outside two cylindrical brass (or stainless steel) coaxial electrodes composition, calculates the water percentage of grain by detecting two interelectrode electric capacity, cereal temperature and grain weight.But in this kind of capacitance detecting mode, capacitor plate directly contacts with tested material, if material water ratio is higher, the insulativity between capacitor plate can be caused to decline, reduce the measuring accuracy of surveying instrument under high-moisture.In addition, need operating personnel often artificially to make zero calibration to LOAD CELLS, operate comparatively loaded down with trivial details inconvenience.
Therefore, industry is badly in need of at a kind of grain ' s moisture teller can measuring grain moisture content under the sight of various water percentage, to improve accuracy of detection.
Summary of the invention
Object of the present invention aims to provide a kind of grain ' s moisture teller that can detect grain moisture content under various water percentage sight, to improve the precision of grain measurement of moisture content under low cost, prerequisite easy and simple to handle.
To achieve these goals, technical scheme of the present invention is:
A kind of grain ' s moisture teller, comprise the capacitive transducer for detecting grain specific inductive capacity, for detecting the temperature-detecting device of cereal temperature, for receiving the testing result of capacitive transducer and temperature-detecting device and calculating the control module of grain water percentage, for inputting external control instruction and the input of display control module result and display module to control module, and the power module of to power for this measuring instrument, it is relative with container floor with its front and be mounted on plate outer side and the measurement plate identified the specific inductive capacity of the grain in container that described capacitive transducer comprises measuring vessel for holding grain to be measured, described measurement plate comprises the dielectric-slab with positive and negative two end faces, the emitting electrode that this dielectric-slab front is provided with ring-type and the receiving electrode arranged around emitting electrode, gap is formed between described emitting electrode and receiving electrode, and in grain measurement of moisture content process, the measurement electric field that its electric field line turns back to receiving electrode after emitting electrode is produced between two electrodes.
Further, described capacitive transducer also comprises around described receiving electrode setting and the equal potential belt of ground connection.
Further, counterpoise grounding is formed in the gap between described emitting electrode and receiving electrode.
Further, described emitting electrode and receiving electrode are configured to two concentric elliptical rings.
Preferably, described circuit board is made up through double-sided copper-clad of the dielectric-slab for composition being FR-4 epoxy resin, and to cover copper thickness be 35 μm.
Preferably, the capacitance signal change-over circuit that described control module comprises single machine unit and is electrically connected with single machine unit, described capacitance signal change-over circuit is connected with emitting electrode and receiving electrode.
Preferably, described capacitance signal change-over circuit is connected with emitting electrode and receiving electrode by concentric cable, and the shielding layer grounding of described concentric cable.
Preferably, described input and display module are touch-screen.
Further, described control module also comprises the touch panel communication circuit be electrically connected with single machine unit electricity and touch-screen.
Preferably, the booster circuit that described power module comprises rechargeable battery, the electricity counting circuit be all connected with rechargeable battery and charging circuit and is connected with electricity counting circuit, described electricity counting circuit and charging circuit are also electrically connected with control module.
Preferably, described temperature-detecting device is digital temperature sensor, and described measuring vessel offers mounting hole, and this digital temperature sensor is placed in this mounting hole.
Preferably, described control module is after the result receiving capacitive transducer and temperature-detecting device, the average moisture content (mois) of grain is gone out: mois (N)=1.7598 × C+5.0624+ (T/10-18) × 0.3/12 based on following formulae discovery, wherein, C is the capacitance change of capacitive transducer, and T is grain temperature.
Compared to existing technology, the solution of the present invention has the following advantages:
Two electrodes due to capacitive transducer are located at the plate outer side of measuring vessel, directly do not contact with grain to be measured, thus the risk causing two interelectrode insulativities to decline when grain moisture content is too high can be avoided, can carry out water percentage detection to the grain of various moisture, and accuracy of detection is higher.
The aspect that the present invention adds and advantage will part provide in the following description, and these will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the theory diagram of grain ' s moisture teller of the present invention;
Fig. 2 is the stereographic map of the capacitive transducer in grain ' s moisture teller of the present invention;
Fig. 3 is the front schematic view of the measurement plate in the capacitive transducer shown in Fig. 2;
Fig. 4 is the reverse side schematic diagram measuring plate shown in Fig. 3;
Fig. 5 is the circuit theory diagrams of the grain ' s moisture teller described in Fig. 1;
Fig. 6 a-6C is that grain ' s moisture teller of the present invention is detecting in grain moisture content process, human-computer interaction interface shown on touch-screen;
The process flow diagram of the detection grain moisture content operation that Fig. 7 implements for the grain ' s moisture teller shown in Fig. 1.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Well-known, under certain condition, material ratio such as the specific inductive capacity of grain uniquely can be determined by its water percentage (MOIS), and the corresponding relation of specific inductive capacity and water percentage is also one to one, so when other condition does not change, capacitive transducer can be utilized to measure the specific inductive capacity of grain, then calculate the water percentage of grain according to the corresponding relation of specific inductive capacity and water percentage.The present invention carries out measurement of water ratio according to this principle to grain exactly.
Fig. 1 to Fig. 7 collectively illustrate grain ' s moisture teller of the present invention 100 (hereinafter referred to as " and measuring instrument), for measuring the water percentage of grain to be measured.Described measuring instrument 100 comprise capacitive transducer 1 for identifying grain specific inductive capacity, for measure cereal temperature temperature-detecting device 2, receive and process the testing result of capacitive transducer 1 and temperature-detecting device 2 control module (non-label, lower with), for the outside steering order of control module input and receive and the input of display control module result and display module 4 and be the power module 5 that this measuring instrument 100 is powered.
Incorporated by reference to Fig. 2, the measurement plate 12 that described capacitive transducer 1 comprises the measuring vessel 11 for holding grain and fixes with this measuring vessel 11 in base plate (non-label, the lower same) outside of measuring vessel 11.
Preferably, described measuring vessel 11 by the tempered glass Guan Yuyi block diameter that one section of thickness is 5mm, length is 90mm, internal diameter is 80mm be 80mm, thickness is that the tempered glass disk of 5mm is bonded, this disk is bonded in the described base plate of one end as measuring vessel 11 of tempered glass pipe.
Incorporated by reference to Fig. 3 and Fig. 4, described measurement plate 12 comprise front-back two-sided all cover copper circuit board 120, be all formed at circuit board 120 front 1201 and emitting electrode 121 all in the form of a ring and receiving electrode 122.The dielectric-slab that described circuit board 120 is FR-4 epoxide resin material by composition is made through double-sided copper-clad, and the copper thickness that covers on the every face of this circuit board is 35 μm.There is between described emitting electrode 121 and receiving electrode 122 certain gap (non-label, lower same), and when grain moisture content detection, in the space between two electrodes 121,122, produce the measurement electric field that its electric field line returns receiving electrode 122 behind emitting electrode 121s.This measurement plate 12 mounts with measuring vessel 11 phase in the face of the base plate of measuring vessel 11 with its front 1201.
Preferably, described emitting electrode 121 and receiving electrode 122 are two elliptical rings arranged with one heart, with the place avoiding surface curvature large (such as sharply, the top of fines) because equipotential plane is intensive, electric field intensity increases severely and causes neighbouring air to be ionized and discharge, and then affects accuracy of detection.
When the specific inductive capacity above two electrodes 121,122 changes along with the increase of grain to be measured in measuring vessel 11, the electric capacity between two electrodes 121,122 also changes thereupon and sends corresponding electric signal in described control module.
Described temperature-detecting device 2 is digital temperature detection device 2, for identifying the temperature of grain in measuring vessel.Described measuring vessel 11 offers the mounting hole 111 (see Fig. 2) of holing-through survey container outboard sidewalls, the probe (not shown) of this digital temperature detection device 2 is placed in this mounting hole 111.
The signaling conversion circuit that described control module comprises single machine unit 3 and is electrically connected with single machine unit 3.This signaling conversion circuit comprises capacitance signal change-over circuit 10, amplifies with the capacitance signal exported capacitive transducer 1, and the simulating signal characterizing capacitance signal is converted to the first digital signal to receive for single machine unit 3 and to process.Described digital temperature detection device 2 is with the second digital signal output temperature testing result, and thus itself and single machine unit 3 are directly connected and can transmit correlated temperature data to single machine unit 3.
Described single machine unit 3 according to the first digital signal received and the second digital signal, the average moisture content (mois) based on following formulae discovery grain to be measured:
Mois (N)=1.7598 × C+5.0624+ (T/10-18) × 0.3/12, wherein, C is the capacitance change of capacitive transducer, and T is grain temperature.
Described input and display module 4, for selecting different operating for user, to input different steering orders to this measuring instrument 100, meanwhile, export and show the result of single machine unit 3 process.This input and display module 4 such as comprise keyboard and LCD display.
In the present invention, two electrodes 121,122 due to capacitive transducer 1 are located at the plate outer side of measuring vessel 11, directly do not contact with grain to be measured, thus the risk causing the insulativity between two electrodes 121,122 to decline when grain moisture content is too high can be avoided, can carry out water percentage detection to the grain of various moisture, and accuracy of detection is higher.
Further, described capacitive transducer 1 also comprises and arranging and the equal potential belt 123 of ground connection around described receiving electrode 122, to prevent the spilling measuring electric field.
Further, in the gap between described emitting electrode 121 and receiving electrode 122, form counterpoise grounding 124, to reduce the edge effect between two electrodes 121,122.
Generally speaking, in order to ensure the accuracy of detection of water percentage, preventing from measuring the excessive and two interelectrode edge effects of electric field, other local ground on circuit board outside two electrodes, to build ground equal potential belt, getting rid of earth magnetism and other external interference.
Incorporated by reference to Fig. 4, further, two electrodes 121,122 are connected by concentric cable (not shown) with capacitance signal change-over circuit 10, and the screen layer of described concentric cable (being also the outer conductor of concentric cable) ground connection, with the stray capacitance eliminating between two contact conductors 1211,1221 and between lead-in wire cable.
Various forms of existing grain ' s moisture teller realizes man-machine interactive operation mainly through button and charactron, and Consumer's Experience is not good, and needs to carry out skills training specially to operating personnel and can be competent at testing.
In order to solve the problem, improve the experience of user, described input and display module 4 are touch-screen 4, with the input command of handled easily personnel and reading numerical values operation.For this reason, described signaling conversion circuit also comprises touch panel communication circuit, this touch panel communication circuit is electrically connected with touch-screen 4 and single machine unit 3 respectively, can receive and the 3rd digital signal processed the steering order inputted by touch-screen 4 to be converted to single machine unit 3.
By contrast, use touch-screen 4 greatly can improve Consumer's Experience, user can input corresponding steering order according to the text prompt on display screen by the virtual push button on touch-screen 4, can to complete measuring grain moisture content operation without the need to carrying out employee skill training.
As mentioned before, described power module 5 is powered for this measuring instrument 100.The booster circuit 53 that described power module 5 comprises rechargeable battery such as lithium battery 50, the electricity counting circuit 51 be all connected with lithium battery 50 and charging circuit 52, is connected with electricity counting circuit 51, and the mu balanced circuit 54 be connected with booster circuit 53.
Described electricity counting circuit 51 and charging circuit 52 are also electrically connected with single machine unit 3, to carry out electricity calculating by electricity counting circuit 51 pairs of lithium batteries 50 under the control of single machine unit 3, and to drive described charging circuit 52 to access external power source via a power interface 55 be that lithium battery 50 charges.
The voltage that described lithium battery 50 exports processes through electricity counting circuit 51 and powers to touch-screen 4 after being boosted by booster circuit 53; Voltage after boosting provides operating voltage for single machine unit 3, signaling conversion circuit and digital temperature sensing device 2 again after mu balanced circuit 54 adjusts.
Because the power module 5 in measuring instrument 100 of the present invention is made up of lithium battery 50, charging circuit 52 and other match circuits, this measuring instrument 100 in use no longer needs the moment to keep being connected with outside civil power, makes this measuring instrument 100 have portable characteristic.
Be the circuit theory diagrams of the preferred implementation of measuring instrument of the present invention see Fig. 5, Fig. 5.The concrete formation of this measuring instrument circuit is described with regard to this circuit diagram below.
The crystal oscillating circuit 31 that described single machine unit 3 comprises single-chip microcomputer 30 further and drives single-chip microcomputer 30 to work.Described single-chip microcomputer 30 adopts model to be STC12LE5620AD (20SOP) single-chip microcomputer, crystal oscillating circuit 31 is the active crystal oscillator of 22.1184M, and the driving power of crystal oscillating circuit 31 and single-chip microcomputer 30 by efficient linear voltage stabilizer AMS1117-3.3 hereinafter described provide (this voltage stabilizer AMS1117-3.3 and peripheral circuit thereof form described in mu balanced circuit 54,5V input voltage is adjusted to 3.3 volts).
Described capacitance signal change-over circuit 10 comprises high precision, fully integrated AD7745 chip and peripheral circuit thereof, and 1 pin of AD7745 chip is connected with P1.2 mouth with the P1.1 mouth of STC12LE5620AD respectively with 16 pin, carries out IIC communication; The lead-in wire 1211,1221 of two electrodes 121,122 is connected with 8 pin (i.e. CIN1 (+)) with 3 pin (i.e. EXCA) of AD7745 chip respectively.Mention above, contact conductor 1211,1221 is connected to reduce stray capacitance with between capacitance signal change-over circuit 10 with the concentric cable of shielding layer grounding, therefore, 3 pin of AD7745 are connected with the lead-in wire of two electrodes with the concentric cable of 8 pin by shielding layer grounding, are less than 1pF to make stray capacitance.
Described touch-screen 4 adopts model to be DMT48270C043_02W, 4.3 cun of 16 look touch-screens.The RxD pin of touch-screen is connected with P3.1 mouth with the P3.0 mouth of STC12LE5620AD chip respectively with TxD pin, carries out standard serial port communication, and communication mode is 38400bps, no parity check, position of rest 1.
Described digital temperature sensing device 2 adopts DS18b20 chip to carry out temperature signal collection, and its supply voltage is 3.3V.This DS18b20 chip is connected with the P3.5 mouth of STC12LE5620AD chip by data line.
In described power module 5, lithium battery 50 adopts the lithium polymer battery of 4500mAh, the charging circuit 52 of lithium battery is linear charging block, it is made up of LTC4054-4.2 chip and peripheral circuit thereof, 4th pin of LTC4054 chip meets external AC-DC adapter (5V through power interface 55,900mA) DC output end, 3rd pin of LTC4054 chip connects lithium battery 50 positive pole, the 5th of LTC4054 chip is connected 1.65k resistance (precision 1%) between pin with ground, the 1st pin of LTC4054 chip connects the P1.3 mouth of STC12LE5620AD, the electricity counting circuit 51 of lithium battery 50 is made up of DS2764 chip and peripheral circuit thereof, 10th pin of DS2764 chip, 14th pin and the 7th pin respectively with the P3.2 mouth of STC12LE5620AD, P3.3 mouth is connected with P3.4 mouth, 8th pin of DS2764 chip is the electric capacity of 0.1uF with being connected a capacitance between the 9th pin, the 4th of DS2764 chip, 5, 6, 11, 12, 13 pin connect lithium battery 50 negative pole, 15th pin of DS2764 chip connects lithium battery 50 negative pole, 16th pin of DS2764 chip is connected a 1k resistance with the positive interpolar of lithium battery 50, 1st pin of DS2764 chip is connected IRF9530 field effect transistor with the 3rd pin each via 1k resistance, 2nd pin of DS2764 chip connects user side positive polarity (i.e. STC12LE5620AD chip, AD7745 chip, the positive pole of DS18b20 chip etc., lower same), booster circuit 53 is made up of LTC3426 chip and peripheral circuit thereof, 6th pin of LTC3426 chip is connected user side positive polarity with the 2nd pin, 6th pin of LTC3426 chip with the 1st pin between be connected a 2.2uH chip inductor, 2nd pin ground connection of LTC3426 chip, the 1st of LTC3426 chip is connected a Xiao Jite diode (ONSemiconductorMBRA210LT2) between pin with pin.
See Fig. 6 a-6c, Fig. 6 a-6c be measuring instrument 100 of the present invention work time, human-computer interaction interface shown on touch-screen 4.Interface 6a is welcome page, shows, automatically jump to interface 6b after measuring instrument initialization completes when measuring instrument powers on; Interface 6b is for preparing test interface, word in interface comprises by this interface the information of module display, comprise: temperature shakiness, removing, dump energy, water cut value, grain temperature value and pendulous frequency, this interface is also provided with " test " and " on average " two touch key-presss; Interface 6c is for calculating interface, and the module shown in the 6c of interface is consistent with 6b, and also has " calculating " and " on average " two touch key-presss.
Fig. 7 is the process flow diagram using measuring instrument of the present invention to carry out grain moisture content detection.First, instrument powers on, display interface 6a on touch-screen, and carrying out system initialization: 1. single-chip microcomputer 30 is sent " AA00CC33C33C " to touch-screen 4 by serial ports, if touch-screen 4 returns " AA00 ' OK_V*.* ' P1P2P3Pic_IDCC33C33C ", (OK_V*.* is touch-screen software version number, P1 is display screen configuration mode, P2 is serial port baud rate, P3 is touch-screen configuration mode, Pic_ID is current display picture number) then touch-screen initialization success, if single-chip microcomputer 30 does not receive response, then touch-screen 4 initialization failure; 2. single-chip microcomputer sends 0xA00x0A0xF90x80 by iic bus to AD7745, the working method arranging AD7745 is continuously, floating ground, inner mean filter number of times are 100 times, if send successfully, AD7745 initialization success, on the contrary then AD7745 initialization failure; 3. single-chip microcomputer is by the temperature data of DALLAS unibus inquiry DS18B20 collection, if temperature value is in 0 ~ 60 DEG C, and DS18B20 initialization success, otherwise DS18B20 initialization failure.If initialization is success all, system wait 3s, touch-screen 4 switches to page 6b.Then user empties capacitive transducer, if electric capacity is greater than 1pF in capacitive transducer, system shows " removing " above screen, and user must guarantee that capacitive transducer is clean before measuring, otherwise can affect final measuring accuracy.If the electric capacity in capacitive transducer is less than 1pF, then show that sensor is cleaned out, " test " button on user's point touching screen page 6b, the unloaded electric capacity C0 of system log (SYSLOG) lower sensor, touch-screen switches to page 6c.User evenly fills tested grain in the measuring vessel 11 of capacitive transducer 1, if the change per second of grain temperature is more than 1 DEG C, system shows above screen " temperature is unstable ", because grain electric capacity increases along with the rising of grain temperature, therefore user must wait for that DS18B20 detects accurate grain temperature, otherwise can affect measuring accuracy.If the change per second of grain temperature is less than 1 DEG C, then show that DS18B20 has detected accurate grain temperature, " calculating " button on user's point touching screen page 6c, the fully loaded electric capacity C1 of system log (SYSLOG) lower sensor and current grain temperature T, the electric capacity C=C1-C0 of tested grain, the water percentage mois (N) of current tested grain is calculated, pendulous frequency N=N+1 according to formula mois (N)=1.7598 × C+5.0624+ (T/10-18) × 0.3/12 demarcated.After measuring several times, " on average " button on user's point touching screen page 6b or page 6c, according to company
calculate average moisture content, pendulous frequency N=0.
In sum, in grain ' s moisture teller 100 of the present invention, because two electrodes of capacitive transducer 1 directly do not contact with grain, the water percentage of the grain of various moisture can be detected.Meanwhile, owing to adopting touch-screen 4 to be used as input and display device, Consumer's Experience is higher.In addition, owing to using the power module 5 comprising lithium battery and charging circuit thereof, this measuring instrument 100 also has portable feature.
The above is only some embodiments of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1. a grain ' s moisture teller, comprise the capacitive transducer for detecting grain specific inductive capacity, for detecting the temperature-detecting device of cereal temperature, for receiving the testing result of capacitive transducer and temperature-detecting device and calculating the control module of grain water percentage, for inputting external control instruction and the input of display control module result and display module to control module, and the power module of to power for this measuring instrument, it is characterized in that, it is relative with container floor with its front and be mounted on plate outer side and the measurement plate identified the specific inductive capacity of the grain in container that described capacitive transducer comprises measuring vessel for holding grain to be measured, described measurement plate comprises the circuit board with positive and negative two end faces, the emitting electrode that this circuit board front is provided with ring-type and the receiving electrode arranged around emitting electrode, gap is formed between described emitting electrode and receiving electrode, and in grain measurement of moisture content process, the measurement electric field that its electric field line turns back to receiving electrode after emitting electrode is produced between two electrodes.
2. grain ' s moisture teller according to claim 1, is characterized in that, described capacitive transducer also comprises around described receiving electrode setting and the equal potential belt of ground connection.
3. grain ' s moisture teller according to claim 1, is characterized in that, forms counterpoise grounding in the gap between described emitting electrode and receiving electrode.
4. the grain ' s moisture teller according to any one of claims 1 to 3, is characterized in that, described emitting electrode and receiving electrode are configured to two concentric elliptical rings.
5. the grain ' s moisture teller according to any one of claims 1 to 3, is characterized in that, described circuit board is made up through double-sided copper-clad of the dielectric-slab for composition being FR-4 epoxy resin, and to cover copper thickness be 35 μm.
6. grain ' s moisture teller according to claim 1, is characterized in that, the capacitance signal change-over circuit that described control module comprises single machine unit and is electrically connected with single machine unit, and described capacitance signal change-over circuit is connected with emitting electrode and receiving electrode.
7. grain ' s moisture teller according to claim 6, is characterized in that, described capacitance signal change-over circuit is connected with emitting electrode and receiving electrode by concentric cable, and the shielding layer grounding of described concentric cable.
8. grain ' s moisture teller according to claim 1, is characterized in that, described input and display module are touch-screen.
9. grain ' s moisture teller according to claim 8, it is characterized in that, described control module comprises single machine unit and the capacitance signal change-over circuit be all electrically connected with this single machine unit and touch panel communication circuit, described capacitance signal change-over circuit is connected with emitting electrode and receiving electrode, and described touch panel communication circuit is connected with touch-screen.
10. grain ' s moisture teller according to claim 1, it is characterized in that, the booster circuit that described power module comprises rechargeable battery, the electricity counting circuit be all connected with rechargeable battery and charging circuit and is connected with electricity counting circuit, described electricity counting circuit and charging circuit are also electrically connected with control module.
11. grain ' s moisture tellers according to claim 1, is characterized in that, described temperature-detecting device is digital temperature sensor, and described measuring vessel offers mounting hole, and this digital temperature sensor is placed in this mounting hole.
12. grain ' s moisture tellers according to claim 1, is characterized in that, described control module, after the result receiving capacitive transducer and temperature-detecting device, goes out the average moisture content (mois) of grain based on following formulae discovery:
Mois (N)=1.7598 × C+5.0624+ (T/10-18) × 0.3/12, wherein, C is the capacitance change of capacitive transducer, and T is grain temperature.
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| CN201510901044.6A CN105548282A (en) | 2015-12-08 | 2015-12-08 | Water content measuring instrument for grain |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106442650A (en) * | 2016-10-16 | 2017-02-22 | 陈畅 | Cereal moisture detection system |
| CN106980332A (en) * | 2017-05-23 | 2017-07-25 | 安徽博微长安电子有限公司 | A kind of detection method of grain storage state |
| CN109540980A (en) * | 2018-12-18 | 2019-03-29 | 华侨大学 | A kind of measurement of water ratio sensing device based on capacitor edge effect |
| CN109682869A (en) * | 2018-11-28 | 2019-04-26 | 安徽机电职业技术学院 | A kind of grain's moisture teller |
| CN109900587A (en) * | 2019-03-09 | 2019-06-18 | 徐立杰 | A kind of device of the measurement heat-sensitive materials water content with multiple measurement positions |
| CN111189891A (en) * | 2020-01-10 | 2020-05-22 | 漳州英特捷自动化科技有限公司 | Radio frequency wave moisture measurement method and radio frequency wave moisture meter |
| CN113092546A (en) * | 2021-05-24 | 2021-07-09 | 天津大学 | Crude oil water content measurement capacitance sensor probe based on active shielding structure |
| CN113311030A (en) * | 2020-02-26 | 2021-08-27 | 上海凡宜科技电子有限公司 | Moisture sensing module |
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| CN109540980B (en) * | 2018-12-18 | 2024-02-23 | 华侨大学 | Water content measurement sensing device based on capacitance edge effect |
| CN109900587A (en) * | 2019-03-09 | 2019-06-18 | 徐立杰 | A kind of device of the measurement heat-sensitive materials water content with multiple measurement positions |
| CN111189891A (en) * | 2020-01-10 | 2020-05-22 | 漳州英特捷自动化科技有限公司 | Radio frequency wave moisture measurement method and radio frequency wave moisture meter |
| CN111189891B (en) * | 2020-01-10 | 2023-06-27 | 漳州英特捷自动化科技有限公司 | Radio frequency wave moisture measuring method and radio frequency wave moisture meter |
| CN113311030A (en) * | 2020-02-26 | 2021-08-27 | 上海凡宜科技电子有限公司 | Moisture sensing module |
| CN113311030B (en) * | 2020-02-26 | 2022-12-06 | 上海凡宜科技电子有限公司 | Moisture sensing module |
| CN113092546A (en) * | 2021-05-24 | 2021-07-09 | 天津大学 | Crude oil water content measurement capacitance sensor probe based on active shielding structure |
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