CN106290484A - A kind of corncob moisture measurement apparatus and corncob moisture measuring method - Google Patents
A kind of corncob moisture measurement apparatus and corncob moisture measuring method Download PDFInfo
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- CN106290484A CN106290484A CN201610629168.8A CN201610629168A CN106290484A CN 106290484 A CN106290484 A CN 106290484A CN 201610629168 A CN201610629168 A CN 201610629168A CN 106290484 A CN106290484 A CN 106290484A
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- 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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
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Abstract
The present invention provides a kind of corncob moisture measurement apparatus and method, and measuring circuit includes high-frequency signal oscillation source, transmission line, measurement electrode, first and second detecting circuit and computing circuit；High-frequency signal oscillation source, transmission line and measurement electrode connect successively, and one end of first and second detecting circuit is connected to transmission line two ends, the concatenation operation circuit input respectively of the first and second detecting circuit other end；Measure electrode and contact the output impedance that the moisture output according to corncob is corresponding with corncob surface, and producing reflected signal when receiving the high_frequency sine wave signal and transmission line impedance and measurement electrode output impedance mismatch that high-frequency signal oscillation source produces and transmit, forward and reverse signal produces moving standing wave on the transmission line；The magnitude of voltage that the AC signal at two detecting circuit detection transmission line two ends obtains this signal corresponding after being converted into direct current signal passes to computing circuit；Computing circuit calculates pressure difference output according to magnitude of voltage.The present invention can realize quick, lossless, accurately measure.
Description
Technical field
The present invention relates to agricultural technology field, particularly relate to a kind of corncob moisture measurement apparatus and corncob moisture
Content measuring method.
Background technology
Moisture is the important character parameter needing during corn breeding to obtain.
At present early threshing is all taked in the measurement of corn moisture by corn breeding mechanism, then carries out the mode of moisture measurement, should
The mode of kind i.e. cannot ensure to obtain the ageing of corn moisture value, can not realize again corn moisture in bulk measurement.Currently there is research
Person uses contact pin type probe measurement corn kernel moisture to achieve corncob moisture measurement to a certain extent, but accuracy of measurement is inclined
Low, bigger problem is to destroy corn kernel integrity, it is impossible to realize the nondestructive measurement of corncob moisture, it is difficult to educate at Semen Maydis
It is widely used in kind.
Accordingly, it is desirable to provide a kind of corncob moisture measurement apparatus that can solve the problems referred to above and measuring method.
Summary of the invention
The present invention provides a kind of corncob moisture measurement apparatus and corncob moisture measuring method, in the present invention
Export impedance variation by described measurement electrode after directly being contacted with tested corncob surface to calculate and corncob moisture
Relevant magnitude of voltage, obtains corncob moisture by described magnitude of voltage analysis, and accuracy rate is high, and without destroying Corn Seeds
Grain integrity, it is achieved that corncob moisture quick, lossless, accurately measure.
First aspect, the present invention provides a kind of corncob moisture measurement apparatus, and described corncob moisture is measured
The measuring circuit of device includes: high-frequency signal oscillation source, transmission line, measurement electrode, the first detecting circuit, the second detecting circuit and
Computing circuit；Described high-frequency signal oscillation source, described transmission line and described measurement electrode are sequentially connected with, described first detecting circuit
One end and one end of described second detecting circuit be connected to the first end and second end of described transmission line, described first inspection
The other end of wave circuit and the other end of described second detecting circuit connect two inputs of described computing circuit respectively, described
The outfan of computing circuit is as the voltage signal output end of described corncob moisture measurement apparatus；
Described measurement electrode contacts with corncob surface, exports corresponding output resistance for the moisture according to corncob
Anti-, and receiving the high_frequency sine wave signal that described high-frequency signal oscillation source produces and transmits, and the transmission of described transmission line
Line impedence and measure electrode output impedance mismatch time produce high frequency reflected signal, described high frequency reflected signal and described high frequency
Sine wave signal produces moving standing wave on described transmission line；
Described high-frequency signal oscillation source, is used for producing high_frequency sine wave signal, and is passed through by described high_frequency sine wave signal
Described transmission line is to described measurement electrode；
Described first detecting circuit, for detecting the AC signal of the moving standing wave of the first end of described transmission line, by described
The AC signal of the moving standing wave of the first end of transmission line is converted into direct current signal, obtains the first voltage that described direct current signal is corresponding
Value, and described first magnitude of voltage is transferred to described computing circuit；
Described second detecting circuit, for detecting the AC signal of the moving standing wave of the second end of described transmission line, by described
The AC signal of the moving standing wave of the second end of transmission line is converted into direct current signal, obtains the second voltage that described direct current signal is corresponding
Value, and described second magnitude of voltage is transferred to described computing circuit；
Described computing circuit, for according to described first magnitude of voltage and described second magnitude of voltage, calculates described transmission line two
The pressure difference of moving standing wave of end also exports.
Preferably, described measurement electrode includes: the first electrode holder of annular, the first round loop electrode, the electricity of annular
Pole partition, the second electrode holder of annular and the second round loop electrode；
The end face of described first electrode holder is provided with the annular groove of the end face opening to described first electrode holder, institute
Stating in the annular groove that the first round loop electrode is arranged on described first electrode holder, the end face of described second electrode holder is provided with
To the annular groove of the end face opening of described second electrode holder, described second round loop electrode is arranged on described second electrode holder
In annular groove, described first electrode holder of described first round loop electrode is installed and the institute of described second round loop electrode is installed
Stating the opposed fastening of annular groove of the second electrode holder, described electrode spacers is arranged on described first electrode holder and described second electricity
Between the carrier of pole, described first round loop electrode and described second round loop electrode, described first electrode holder, the first annulus are opened in isolation
Electrode, electrode spacers, the second electrode holder and the second round loop electrode are arranged concentrically.
Preferably, the internal diameter of the external diameter of described first round loop electrode and the annular groove of described first electrode holder is equal, institute
The internal diameter stating the external diameter of the second round loop electrode and the annular groove of described second electrode holder is equal, the external diameter of described electrode spacers and
The external diameter of the external diameter of the annular groove of described first electrode holder and the annular groove of described second electrode holder is equal.
Preferably, described device also includes: matrix and fixture；
Described matrix is hollow-core construction, and the upper surface of described matrix is provided with the annulus of the upper surface opening to described matrix
Groove, described measurement electrode is fixed in the annular groove of described matrix by described fixture, and described fixture and described matrix are removable
Unload connection.
Preferably, described fixture and described matrix are threaded.
Preferably, the sidewall of the annular groove of described matrix offers for drawing described first round loop electrode and described
The fairlead of the lead-in wire of the second round loop electrode.
Preferably, described measuring circuit also includes: filter circuit, amplifying circuit and A/D change-over circuit；
Described computing circuit, described filter circuit, described amplifying circuit and described A/D change-over circuit are sequentially connected with, and are used for
It is converted into digital signal defeated after the pressure difference filtering of the moving standing wave at the described transmission line two ends exported by described computing circuit, amplification
Go out.
Preferably, described first detecting circuit includes: the first diode, the first electric capacity, the first resistance, the 3rd electric capacity and
Three resistance；
The anode of described first diode connects the first end of described transmission line, and the negative electrode of described first diode connects institute
Stating the first end of the first electric capacity, the first end of described 3rd electric capacity connects the first end of described 3rd resistance, described first resistance
It is connected between the first end of described first electric capacity and the first end of described 3rd electric capacity, the second end of described first electric capacity, institute
Stating the second end and the second end ground connection of described 3rd resistance of the 3rd electric capacity, the first end of described 3rd resistance connects described computing
The first input end of circuit；
Described second detecting circuit includes: the second diode, the second electric capacity, the second resistance, the 4th electric capacity and the 4th resistance；
The anode of described second diode connects the second end of described transmission line, and the negative electrode of described second diode connects institute
Stating the first end of the second electric capacity, the first end of described 4th electric capacity connects the first end of described 4th resistance, described second resistance
It is connected between the first end of described second electric capacity and the first end of described 4th electric capacity, the second end of described second electric capacity, institute
Stating the second end and the second end ground connection of described 4th resistance of the 4th electric capacity, the first end of described 4th resistance connects described computing
Second input of circuit.
Preferably, described computing circuit includes: the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and operation amplifier
Device；
Described 5th resistance and described 7th resistance are connected to form bleeder circuit, described 5th resistance and described 7th resistance
Junction point be connected to the first input end of described operational amplifier, described 6th resistance and described 8th resistance are connected to form point
Volt circuit, the junction point of described 6th resistance and described 8th resistance is connected to the second input of described operational amplifier, institute
State the voltage signal output end that outfan is described corncob moisture measurement apparatus of operational amplifier.
Second aspect, the present invention also provides for a kind of corncob moisture measuring method, including:
Described measurement electrode contacts with corncob surface, exports corresponding output impedance according to the moisture of corncob,
And receiving the high_frequency sine wave signal that described high-frequency signal oscillation source produces and transmits, and the transmission line resistance of described transmission line
Anti-and produce high frequency reflected signal, described high frequency reflected signal and described high frequency sinusoidal when measuring the output impedance mismatch of electrode
Ripple signal produces moving standing wave on described transmission line；
Described high-frequency signal oscillation source produces high_frequency sine wave signal, and by described high_frequency sine wave signal by described biography
Defeated line is transferred to described measurement electrode；
Described first detecting circuit detects the AC signal of the moving standing wave of the first end of described transmission line, by described transmission line
The AC signal of moving standing wave of the first end be converted into direct current signal, obtain the first magnitude of voltage that described direct current signal is corresponding, and
Described first magnitude of voltage is transferred to described computing circuit；
Described second detecting circuit detects the AC signal of the moving standing wave of the second end of described transmission line, by described transmission line
The AC signal of moving standing wave of the second end be converted into direct current signal, obtain the second magnitude of voltage that described direct current signal is corresponding, and
Described second magnitude of voltage is transferred to described computing circuit；
Described computing circuit, according to described first magnitude of voltage and described second magnitude of voltage, calculates the row at described transmission line two ends
The pressure difference of standing wave also exports.
As shown from the above technical solution, heretofore described measurement electrode directly contacts with tested corncob surface, described
Measuring electrode output impedance variation and reflect that corn kernel moisture changes, the output of described corncob moisture measurement apparatus is with beautiful
Magnitude of voltage that rice fringe moisture is relevant (that is: the pressure difference of the moving standing wave at described transmission line two ends), by described magnitude of voltage i.e.
Can analyze and obtain corncob moisture, accuracy rate is high, and without destroying corn kernel integrity, it is achieved that corncob moisture
Quickly, lossless, accurately measure.
Accompanying drawing explanation
The principle frame of the measuring circuit of a kind of corncob moisture measurement apparatus that Fig. 1 provides for one embodiment of the invention
Figure；
The explosive view measuring electrode that Fig. 2 provides for one embodiment of the invention；
Fig. 3 is a kind of structural representation that corncob puts in corncob moisture measurement apparatus；
Fig. 4 is a kind of physical circuit figure of measuring circuit of the present invention；
The flow chart of a kind of corncob moisture measuring method that Fig. 5 provides for one embodiment of the invention；
Fig. 6 is that two kinds of corn varieties that the embodiment of the present invention obtains demarcate graph of a relation.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is described in further detail.Hereinafter implement
Example is used for illustrating the present invention, but is not limited to the scope of the present invention.
The principle frame of the measuring circuit of a kind of corncob moisture measurement apparatus that Fig. 1 provides for one embodiment of the invention
Figure.
A kind of corncob moisture measurement apparatus as shown in Figure 1, the survey of described corncob moisture measurement apparatus
Amount circuit includes: high-frequency signal oscillation source 101, transmission line 102, measurement electrode the 103, first detecting circuit the 104, second detection electricity
Road 105 and computing circuit 106；Described high-frequency signal oscillation source 101, described transmission line 102 and described measurement electrode 103 connect successively
Connecing, one end of described first detecting circuit 104 and one end of described second detecting circuit 105 are connected to described transmission line
First end of 102 and the second end, the other end of described first detecting circuit 104 and the other end of described second detecting circuit 105
Connecting two inputs of described computing circuit 106 respectively, the outfan of described computing circuit 106 is as described corncob moisture
The voltage signal output end of content measurement device；
Described measurement electrode 103 contacts with corncob surface, exports the defeated of correspondence for the moisture according to corncob
Go out impedance, and receive the high_frequency sine wave signal that described high-frequency signal oscillation source 101 produces and transmits, and described transmission line
The transmission line impedance of 102 and measure electrode 103 output impedance mismatch time produce high frequency reflected signal, described high frequency reflection letter
Number and described high_frequency sine wave signal on described transmission line 102, produce moving standing wave；
What deserves to be explained is, described measurement electrode 103 directly contacts with tested corncob surface, and described measurement electrode exports
Impedance variation reflects that corn kernel moisture changes.
Described high-frequency signal oscillation source 101, is used for producing high_frequency sine wave signal, and is led to by described high_frequency sine wave signal
Cross described transmission line 102 and be transferred to described measurement electrode 103；
Described first detecting circuit 104, for detecting the AC signal of the moving standing wave of the first end of described transmission line 102,
The AC signal of the moving standing wave of the first end of described transmission line 102 is converted into direct current signal, obtains described direct current signal corresponding
The first magnitude of voltage, and described first magnitude of voltage is transferred to described computing circuit 106；
Described second detecting circuit 105, for detecting the AC signal of the moving standing wave of the second end of described transmission line 102,
The AC signal of the moving standing wave of the second end of described transmission line 102 is converted into direct current signal, obtains described direct current signal corresponding
The second magnitude of voltage, and described second magnitude of voltage is transferred to described computing circuit 106；
Described computing circuit 106, for according to described first magnitude of voltage and described second magnitude of voltage, calculates described transmission line
The pressure difference of the moving standing wave at 102 two ends also exports.
What deserves to be explained is, the pressure difference of the moving standing wave at transmission line two ends is the moving standing wave amplitude voltage at transmission line two ends
Difference.
Measuring electrode 103 described in the embodiment of the present invention directly to contact with tested corncob surface, described measurement electrode is defeated
Going out impedance variation and reflect that corn kernel moisture changes, the output of described corncob moisture measurement apparatus contains with corncob moisture
Magnitude of voltage that amount is relevant (that is: the pressure difference of the moving standing wave at described transmission line 102 two ends), can be analyzed by described magnitude of voltage
To corncob moisture, accuracy rate is high, and without destroying corn kernel integrity, it is achieved that corncob moisture quick,
Lossless, accurately measure.
What deserves to be explained is, corncob moisture can be by demarcating really with measuring circuit output voltage values corresponding relation
Fixed.
As in figure 2 it is shown, as a kind of preferred embodiment, described measurement electrode 103 includes: the first electrode holder of annular
202, the first round loop electrode 203, the electrode spacers 204 of annular, the second electrode holder of annular and the second round loop electrode；
The end face of described first electrode holder 202 is provided with the circle of the end face opening to described first electrode holder 202
Annular groove, described first round loop electrode 203 is arranged in the annular groove of described first electrode holder 202, described second electrode holder
End face be provided with the annular groove of the end face opening to described second electrode holder, described second round loop electrode is arranged on described
In the annular groove of the second electrode holder, described first electrode holder 202 of described first round loop electrode 203 is installed and is provided with
The opposed fastening of annular groove of described second electrode holder of described second round loop electrode, described electrode spacers 204 is arranged on described
Between first electrode holder 202 and described second electrode holder, described first round loop electrode 203 and described second annulus are opened in isolation
Electrode, described first electrode holder the 202, first round loop electrode 203, electrode spacers the 204, second electrode holder and the second annulus electricity
Pole is arranged concentrically.Described second electrode holder and the second round loop electrode combine and form upper measurement electrode 205.
What deserves to be explained is, electrode spacers 204 is used for avoiding measuring electric pole short circuit up and down and regulation fathoms.Described
Measure electrode up and down and refer mainly to the first round loop electrode 203 and the second round loop electrode.
Use the embodiment of the present invention, corncob to be measured can be inserted in annular and measure in electrode 103, it is achieved measure electrode
103 directly contact with tested the stable of corncob surface.
In order to make round loop electrode and good the fixing of electrode holder, as a kind of preferred embodiment, described first annulus electricity
The internal diameter of the external diameter of pole 203 and the annular groove of described first electrode holder 202 is equal, the external diameter of described second round loop electrode and institute
The internal diameter of the annular groove stating the second electrode holder is equal, in order to make the annular groove of measurement electrode and matrix 201 stably coordinate, described
The external diameter of electrode spacers 204 and the external diameter of the annular groove of described first electrode holder 202 and the circle of described second electrode holder
The external diameter of annular groove is equal.Other in addition to the first round loop electrode 203 and the second round loop electrode measuring electrode 103 so formed
Parts such as are at the gauge structure, and when being placed in the annular groove of matrix 201, structure comparison is stable.
In order to support and fix described measurement electrode 103, as a kind of preferred embodiment, described device also includes: matrix
201 and fixture 206；
Described matrix 201 is hollow-core construction, and the upper surface of described matrix 201 is provided with the upper surface to described matrix 201
The annular groove of opening, described measurement electrode 103 is fixed in the annular groove of described matrix 201 by described fixture 206, described solid
Locking member 206 and described matrix 201 removably connect.For ease of realizing and easy installation and removal, described fixture 206 and institute
State matrix 201 and can use threaded.
(the most integrated for the ease of measuring the connection of electrode 103 and integrated circuit (integrated circuit of described measuring circuit)
It is outer that circuit is arranged on matrix 201), the sidewall of the annular groove of described matrix 201 offers for drawing described first annulus
The fairlead 207 of the lead-in wire of electrode 203 and described second round loop electrode.Fig. 3 gives corncob and puts into above-mentioned corncob water
Dividing a kind of structural representation in content measurement device, wherein, corncob 100 is placed on measurement electrode, matrix and fixture group
In the measurement body 200 become, integrated circuit 300 is arranged on the outer wall measuring body 200, and by fairlead 207 and measurement electrode
Connect.
Refer again to Fig. 1, in order to the signal of output is filtered, is amplified and converted to accessible digital signal, as
A kind of preferred embodiment, described measuring circuit also includes: filter circuit 107, amplifying circuit 108 and A/D change-over circuit 109；
Described computing circuit 106, described filter circuit 107, described amplifying circuit 108 and described A/D change-over circuit 109 depend on
Secondary connection, the pressure difference filtering of moving standing wave at described transmission line 102 two ends for described computing circuit 106 is exported, amplification
After be converted into digital signal output.
Fig. 4 discloses a kind of physical circuit figure of measuring circuit of the present invention, the first detecting circuit 104 as shown in Figure 4
With the physical circuit of the second detecting circuit 105 it is: described first detecting circuit 104 includes: the first diode D1, the first electric capacity
C1, the first resistance R1, the 3rd electric capacity C3 and the 3rd resistance R3；
The anode of described first diode D1 connects the first end of described transmission line 102, the moon of described first diode D1
Pole connects first end of described first electric capacity C1, and first end of described 3rd electric capacity C3 connects the first of described 3rd resistance R3
End, described first resistance R1 is connected between the first end and first end of described 3rd electric capacity C3 of described first electric capacity C1, institute
State second end of the first electric capacity C1, second end of described 3rd electric capacity C3 and the second end ground connection of described 3rd resistance R3, described
First end of the 3rd resistance R3 connects the first input end of described computing circuit 106；
Described second detecting circuit 105 includes: the second diode D2, the second electric capacity C2, the second resistance R2, the 4th electric capacity C4
With the 4th resistance R4；
The anode of described second diode D2 connects the second end of described transmission line 102, the moon of described second diode D2
Pole connects first end of described second electric capacity C2, and first end of described 4th electric capacity C4 connects the first of described 4th resistance R4
End, described second resistance R2 is connected between the first end and first end of described 4th electric capacity C4 of described second electric capacity C2, institute
State second end of the second electric capacity C2, second end of described 4th electric capacity C4 and the second end ground connection of described 4th resistance R4, described
First end of the 4th resistance R4 connects the second input of described computing circuit 106.
The physical circuit of computing circuit 106 as shown in Figure 4 is, described computing circuit 106 includes: the 5th resistance R5,
Six resistance R6, the 7th resistance R7, the 8th resistance R8 and the first operational amplifier A 1；
Described 5th resistance R5 and described 7th resistance R7 is connected to form bleeder circuit, described 5th resistance R5 and described
The junction point of seven resistance R7 is connected to the first input end of described first operational amplifier A 1, described 6th resistance R6 and described
Eight resistance R8 are connected to form bleeder circuit, and the junction point of described 6th resistance R6 and described 8th resistance R8 is connected to described first
Second input of operational amplifier A 1, the outfan of described first operational amplifier A 1 is that described corncob moisture is measured
The voltage signal output end of device.
High-frequency signal oscillation source 101 in Fig. 4 uses active crystal oscillator OSC to produce high_frequency sine wave signal.
The physical circuit of filter circuit 107 as shown in Figure 4 is: filter circuit 107 includes the first inductance L1 and the 5th electricity
The first end holding C5, described first inductance L1 connects the outfan of described computing circuit 106, second end of described first inductance L1
Connecting first end of described 5th electric capacity C5, second end of described 5th electric capacity C5 connects the 7th electricity in described computing circuit 106
One end of resistance R7 ground connection.
The physical circuit of amplifying circuit 108 as shown in Figure 4 is: amplifying circuit 108 includes the 9th resistance R9, the tenth resistance
R10 and the second operational amplifier A 2, second end (namely first end of the 5th electric capacity C5) of described first inductance L1 connects described
The first input end of the second operational amplifier A 2, described 9th resistance R9 and the tenth resistance R10 connect formation bleeder circuit and connect
Second input of described second operational amplifier A 2, the outfan of described second operational amplifier A 2 is as amplifying circuit 108
Outfan, connect the input of described A/D change-over circuit 109, A/D change-over circuit 109 can use STC15W4K16S4 chip,
Use the internal A/D of STC15W4K16S4 to change pressure difference, and exported the voltage being converted to by the serial ports of STC15W4K16S4
Value.
In order to clearly show that the impedance of the active crystal oscillator as high-frequency signal oscillation source 101, the impedance of defeated line and survey in Fig. 4
The impedance of amount electrode 103, represents the resistance of the impedance of active crystal oscillator, transmission line respectively with resistance Z0, the first resistance Z1 and resistance ZL
Resisting and measure the impedance of electrode 103, the line residing for the first resistance Z1 represents transmission line 102.
The flow chart of a kind of corncob moisture measuring method that Fig. 5 provides for one embodiment of the invention.
A kind of corncob moisture measuring method as shown in Figure 5, including:
S501, described measurement electrode contact with corncob surface, export corresponding output according to the moisture of corncob
Impedance, and receiving the high_frequency sine wave signal that described high-frequency signal oscillation source produces and transmits, and the biography of described transmission line
Defeated line impedence and measure electrode output impedance mismatch time produce high frequency reflected signal, described high frequency reflected signal and described height
Frequency sine-wave signal produces moving standing wave on described transmission line；
S502, described high-frequency signal oscillation source produce high_frequency sine wave signal, and are passed through by described high_frequency sine wave signal
Described transmission line is to described measurement electrode；
S503, described first detecting circuit detect the AC signal of the moving standing wave of the first end of described transmission line, by described
The AC signal of the moving standing wave of the first end of transmission line is converted into direct current signal, obtains the first voltage that described direct current signal is corresponding
Value, and described first magnitude of voltage is transferred to described computing circuit；
S504, described second detecting circuit detect the AC signal of the moving standing wave of the second end of described transmission line, by described
The AC signal of the moving standing wave of the second end of transmission line is converted into direct current signal, obtains the second voltage that described direct current signal is corresponding
Value, and described second magnitude of voltage is transferred to described computing circuit；
S505, described computing circuit, according to described first magnitude of voltage and described second magnitude of voltage, calculate described transmission line two
The pressure difference of moving standing wave of end also exports.
Measure electrode described in the embodiment of the present invention directly to contact with tested corncob surface, the output resistance of described measurement electrode
Resistance reflects that corn kernel moisture changes, the output of described corncob moisture measurement apparatus and corncob moisture phase
The magnitude of voltage (that is: the pressure difference of the moving standing wave at described transmission line two ends) closed, can be analyzed by described magnitude of voltage and obtain Semen Maydis
Fringe moisture, accuracy rate is high, and without destroying corn kernel integrity, it is achieved that corncob moisture quick, lossless, accurate
Really measure.
The magnitude of voltage of above-mentioned high frequency reflected signalExpression formula be
Wherein, Z (θ) is the resistance value of the output impedance of measuring electrode relevant to corncob moisture,For high frequency
The magnitude of voltage of sine wave signal；
The expression formula of the magnitude of voltage V (1) of the moving standing wave that step S501 produces is:
Wherein,For the magnitude of voltage of high_frequency sine wave signal, l is along transmission line distance and position；β is phase constant；Г is
Reflection coefficient；
The expression formula of pressure difference Δ V (θ) of the moving standing wave at the transmission line two ends in step S505 is:
Δ V (θ)=| V (a) |max-|V(b)|max
Wherein, | V (a) | max, | V (b) | max are respectively the first detecting circuit, the direct current letter of the second detecting circuit output
Number, it is ideally the amplitude of sine wave signal, the most described first magnitude of voltage and the second magnitude of voltage；Described pressure difference (Δ V
(θ)) determined by demarcation with corncob moisture value (W) corresponding relation, select a series of gradient moisture value between 10%-40%
Corncob, obtains exporting pressure difference (Δ V (θ)) with measurement apparatus measurement, chooses surveyed corncob seed and is no less than 90, uses
Standard oven drying method is dried, and obtains measured corn moisture as actual moisture value (W), by curve matching acquisition calibration formula:
W=A* Δ V (θ)2+B*ΔV(θ)+C
Wherein, W is the moisture value of corncob,
Δ V (θ) is the pressure difference measured and export,
A, B, C are calibration coefficient；
Fig. 6 is that two kinds of corn varieties that the embodiment of the present invention obtains demarcate graph of a relation, the demarcation ginseng that corn variety one obtains
Number is A:.-1.908E-05, and B:5.837E-03, C:-8.431E-02, the calibrating parameters that corn variety two obtains is A:-
2.149E-05, B:6.140E-03, C:-7.345E-02.
One of ordinary skill in the art will appreciate that: various embodiments above only in order to technical scheme to be described, and
Non-to its restriction；Although the present invention being described in detail with reference to foregoing embodiments, those of ordinary skill in the art
It is understood that the technical scheme described in foregoing embodiments still can be modified by it, or to wherein part or
All technical characteristic carries out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from this
Bright claim limited range.
Claims (10)
1. a corncob moisture measurement apparatus, it is characterised in that the measurement of described corncob moisture measurement apparatus
Circuit includes: high-frequency signal oscillation source, transmission line, measurement electrode, the first detecting circuit, the second detecting circuit and computing circuit；
Described high-frequency signal oscillation source, described transmission line and described measurement electrode are sequentially connected with, one end of described first detecting circuit and
One end of described second detecting circuit is connected to the first end and second end of described transmission line, described first detecting circuit
The other end of the other end and described second detecting circuit connects two inputs of described computing circuit, described computing circuit respectively
Outfan as the voltage signal output end of described corncob moisture measurement apparatus；
Described measurement electrode contacts with corncob surface, exports corresponding output impedance for the moisture according to corncob,
And receiving the high_frequency sine wave signal that described high-frequency signal oscillation source produces and transmits, and the transmission line resistance of described transmission line
Anti-and produce high frequency reflected signal, described high frequency reflected signal and described high frequency sinusoidal when measuring the output impedance mismatch of electrode
Ripple signal produces moving standing wave on described transmission line；
Described high-frequency signal oscillation source, is used for producing high_frequency sine wave signal, and by described high_frequency sine wave signal by described
Transmission line is to described measurement electrode；
Described first detecting circuit, for detecting the AC signal of the moving standing wave of the first end of described transmission line, by described transmission
The AC signal of the moving standing wave of the first end of line is converted into direct current signal, obtains the first magnitude of voltage that described direct current signal is corresponding,
And described first magnitude of voltage is transferred to described computing circuit；
Described second detecting circuit, for detecting the AC signal of the moving standing wave of the second end of described transmission line, by described transmission
The AC signal of the moving standing wave of the second end of line is converted into direct current signal, obtains the second magnitude of voltage that described direct current signal is corresponding,
And described second magnitude of voltage is transferred to described computing circuit；
Described computing circuit, for according to described first magnitude of voltage and described second magnitude of voltage, calculates described transmission line two ends
The pressure difference of moving standing wave also exports.
Device the most according to claim 1, it is characterised in that described measurement electrode includes: the first electrode of annular carries
Body, the first round loop electrode, the electrode spacers of annular, the second electrode holder of annular and the second round loop electrode；
The end face of described first electrode holder is provided with the annular groove of the end face opening to described first electrode holder, and described
One round loop electrode is arranged in the annular groove of described first electrode holder, and the end face of described second electrode holder is provided with to institute
Stating the annular groove of the end face opening of the second electrode holder, described second round loop electrode is arranged on the annulus of described second electrode holder
In groove, described first electrode holder of described first round loop electrode is installed and is provided with described the of described second round loop electrode
The opposed fastening of annular groove of two electrode holders, described electrode spacers is arranged on described first electrode holder and described second electrode carries
Between body, described first round loop electrode and described second round loop electrode, described first electrode holder, the first annulus electricity are opened in isolation
Pole, electrode spacers, the second electrode holder and the second round loop electrode are arranged concentrically.
Device the most according to claim 2, it is characterised in that the external diameter of described first round loop electrode and described first electrode
The internal diameter of the annular groove of carrier is equal, the external diameter of described second round loop electrode and the internal diameter of the annular groove of described second electrode holder
Equal, the external diameter of described electrode spacers and the external diameter of the annular groove of described first electrode holder and described second electrode holder
The external diameter of annular groove is equal.
Device the most according to claim 2, it is characterised in that described device also includes: matrix and fixture；
Described matrix is hollow-core construction, and the upper surface of described matrix is provided with the annular groove of the upper surface opening to described matrix,
Described measurement electrode is fixed in the annular groove of described matrix by described fixture, and described fixture and described matrix detachably connect
Connect.
Device the most according to claim 4, it is characterised in that described fixture and described matrix are threaded.
Device the most according to claim 4, it is characterised in that offer on the sidewall of the annular groove of described matrix for
Draw the fairlead of the lead-in wire of described first round loop electrode and described second round loop electrode.
Device the most according to claim 1, it is characterised in that described measuring circuit also includes: filter circuit, amplifying circuit
With A/D change-over circuit；
Described computing circuit, described filter circuit, described amplifying circuit and described A/D change-over circuit are sequentially connected with, for by institute
It is converted into digital signal output after stating the pressure difference filtering of the moving standing wave at the described transmission line two ends of computing circuit output, amplification.
8. according to the device according to any one of claim 1-7, it is characterised in that described first detecting circuit includes: first
Diode, the first electric capacity, the first resistance, the 3rd electric capacity and the 3rd resistance；
The anode of described first diode connects the first end of described transmission line, and the negative electrode of described first diode connects described the
First end of one electric capacity, the first end of described 3rd electric capacity connects the first end of described 3rd resistance, and described first resistance connects
Between first end and the first end of described 3rd electric capacity of described first electric capacity, the second end of described first electric capacity, described
Second end of three electric capacity and the second end ground connection of described 3rd resistance, the first end of described 3rd resistance connects described computing circuit
First input end；
Described second detecting circuit includes: the second diode, the second electric capacity, the second resistance, the 4th electric capacity and the 4th resistance；
The anode of described second diode connects the second end of described transmission line, and the negative electrode of described second diode connects described the
First end of two electric capacity, the first end of described 4th electric capacity connects the first end of described 4th resistance, and described second resistance connects
Between first end and the first end of described 4th electric capacity of described second electric capacity, the second end of described second electric capacity, described
Second end of four electric capacity and the second end ground connection of described 4th resistance, the first end of described 4th resistance connects described computing circuit
The second input.
9. according to the device according to any one of claim 1-7, it is characterised in that described computing circuit includes: the 5th resistance,
6th resistance, the 7th resistance, the 8th resistance and operational amplifier；
Described 5th resistance and described 7th resistance are connected to form bleeder circuit, described 5th resistance and the company of described 7th resistance
Contact is connected to the first input end of described operational amplifier, and described 6th resistance and described 8th resistance are connected to form dividing potential drop electricity
Road, the junction point of described 6th resistance and described 8th resistance is connected to the second input of described operational amplifier, described fortune
Calculate the voltage signal output end that outfan is described corncob moisture measurement apparatus of amplifier.
10. a corncob moisture based on the corncob moisture measurement apparatus according to any one of claim 1-9 contains
Measuring method, it is characterised in that including:
Described measurement electrode contacts with corncob surface, according to the output impedance that the moisture output of corncob is corresponding, and
Receive the high_frequency sine wave signal that described high-frequency signal oscillation source produces and transmits, and the transmission line impedance of described transmission line and
High frequency reflected signal, described high frequency reflected signal and described high_frequency sine wave letter is produced when measuring the output impedance mismatch of electrode
Produce moving standing wave number on described transmission line；
Described high-frequency signal oscillation source produces high_frequency sine wave signal, and by described high_frequency sine wave signal by described transmission line
It is transferred to described measurement electrode；
Described first detecting circuit detects the AC signal of moving standing wave of the first end of described transmission line, by the of described transmission line
The AC signal of the moving standing wave of one end is converted into direct current signal, obtains the first magnitude of voltage that described direct current signal is corresponding, and by institute
State the first magnitude of voltage and be transferred to described computing circuit；
Described second detecting circuit detects the AC signal of moving standing wave of the second end of described transmission line, by the of described transmission line
The AC signal of the moving standing wave of two ends is converted into direct current signal, obtains the second magnitude of voltage that described direct current signal is corresponding, and by institute
State the second magnitude of voltage and be transferred to described computing circuit；
Described computing circuit, according to described first magnitude of voltage and described second magnitude of voltage, calculates the moving standing wave at described transmission line two ends
Pressure difference and export.
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| CN107621484A (en) * | 2017-08-31 | 2018-01-23 | 苏州麦喆思科电子有限公司 | A kind of hand-held sugar measuring instrument |
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| CN113533439A (en) * | 2021-06-25 | 2021-10-22 | 中国农业大学 | Electrical impedance imaging method and system for corn ear moisture distribution and electronic equipment |
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