CN104483231B - A kind of moisture content detection check device - Google Patents
A kind of moisture content detection check device Download PDFInfo
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- CN104483231B CN104483231B CN201410812497.7A CN201410812497A CN104483231B CN 104483231 B CN104483231 B CN 104483231B CN 201410812497 A CN201410812497 A CN 201410812497A CN 104483231 B CN104483231 B CN 104483231B
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- potentiometer
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Abstract
A kind of moisture content detection check device, it is related to moisture content detection check device.It is inaccurate that the present invention solves the detection of existing apparatus moisture content, it is impossible to realizes the measurement for different tree species moisture content at different temperatures, and the problem of verified to the moisture content of different temperatures different water cut.The present invention's includes sensing part, data processing section and display screen, sensing part includes probe and temperature sensor, power supply, data processing section includes moisture content and detects circuit, temperature sensing circuit, A/D modular converters, CPLD chips, moisture content detection circuit includes the first test side, second test side, first triode, second triode, 3rd triode, FET, first potentiometer, second potentiometer, 3rd potentiometer, voltage-stablizer, first resistor, second resistance, 3rd resistor, first electrochemical capacitor, second electrochemical capacitor, first filter capacitor, second filter capacitor and operational amplifier.The present invention is simple in construction, and testing result is accurate.
Description
Technical field
The present invention relates to moisture content detection check device, and in particular to moisture content detection check device, belongs to timber
Detection technique field.
Background technology
At present, moisture content detects that most accurate detection method is contained humidity in over dry weight method i.e. wood sample
Gross mass and the mass ratio (weight method) of the absolutely dry sample of timber, due to being detected in drying of wood production process using weight method
Moisture content is very inconvenient, so using the electric-resistivity method (timber of detection different water cut in drying of wood production process
Volume resistance) moisture content is detected, and existing electric-resistivity method moisture content is detected, simply according to density timber
It is divided into several classes to measure, not to different tree species, accurate calibration is carried out under condition of different temperatures.Therefore, present invention design
This electric-resistivity method moisture content detection check device.
The content of the invention
It is inaccurate that the present invention solves the detection of existing apparatus moisture content, it is impossible to realizes for different tree species at different temperatures
The measurement of moisture content, and asking that the moisture content of different temperatures different water cut can not be verified and demarcated
Topic.
The technical scheme is that：A kind of moisture content detection check device, including power supply, sensing part, data
Process part and display screen, the sensing part include probe and temperature sensor, and data processing section is detected including moisture content
Circuit, temperature sensing circuit, A/D modular converters, CPLD chips, the moisture content detection circuit include the first test side, second
Test side, the first triode, the second triode, the 3rd triode, FET, the first potentiometer, the second potentiometer, the 3rd electricity
Position device, voltage-stablizer, first resistor, second resistance, 3rd resistor, the first electrochemical capacitor, the second electrochemical capacitor, the first filtered electrical
Appearance, the second filter capacitor and operational amplifier, the output end of power supply connect the colelctor electrode of the first triode, the collection of the first triode
Between electrode and emitter stage and first resistor and the first electrochemical capacitor are connected to, after second resistance and 3rd resistor series connection and the second electricity
Solution electric capacity is simultaneously connected between the emitter stage of the first triode and base stage, the base of the input of the voltage-stablizer and the first triode
Pole is connected, and the output end of voltage-stablizer is set up with the negative pole of the first electrochemical capacitor and is connected, and the control end of voltage-stablizer is connected to the second electricity
Between resistance and 3rd resistor, the emitter stage of the first triode connects one end of the first potentiometer, the one of the first filter capacitor respectively
End and the in-phase input end of operational amplifier, the sliding end of the first potentiometer connect with one end of the second potentiometer and sliding end respectively
Connect, the other end of the second potentiometer is set up with the source electrode of FET with the other end of the first filter capacitor and is connected, field-effect
The grid of pipe is connected after being sequentially connected the emitter stage of the base stage of the second triode and the 3rd triode with the second test side, and described
The base stage of the emitter stage of two triodes and the 3rd triode is set up and is connected, and the grid of FET passes through the second filter capacitor and the
Connection is set up in one test side, and first test side and the second test side are moisture content detection circuit input end, operational amplifier
Output end for moisture content detect circuit output end；
The probe connects the first test side and the second test side and is connected with moisture content detection circuit foundation respectively, and temperature is passed
Sensor cut-in temperature detects circuit, and the output end of moisture content detection circuit and the output end of temperature sensing circuit access A/D, A/
The output end of D modular converters is set up with CPLD chips and is connected, and the output end of CPLD chips is set up with display screen to be connected.
The 3rd potentiometer is provided between second test side and the emitter stage of the 3rd triode, the 3rd potentiometer
One end and the second test side are set up and be connecteds, the emitter stage foundation of the other end and sliding end of the 3rd potentiometer with the 3rd triode
Connection, the current value of the second test side of effective control, the current value of stabilizing circuit prevents current fluctuation from causing signal to disturb.
The temperature sensing circuit includes the first incoming end, the second incoming end, the first constant-current source, the second constant-current source, the 3rd
Electrochemical capacitor, the 4th electrochemical capacitor, the first amplifier and the second amplifier, the input of first constant-current source and the second constant-current source
End sets up with power input be connected respectively, the output end of the first constant-current source successively with the second incoming end, the 3rd electrochemical capacitor
Set up and be connected with the inverting input of the first amplifier after the negative pole connection of negative pole and the 4th electrochemical capacitor, the second constant-current source it is defeated
Go out end be connected successively with the positive pole of the second incoming end, the positive pole of the 3rd electrochemical capacitor and the 4th electrochemical capacitor after with the first amplifier
In-phase input end set up connection, the in-phase input end of the amplifier of output end second of the first amplifier sets up connection, described the
One incoming end and the input that the second incoming end is temperature sensing circuit, the output end of the second amplifier is temperature sensing circuit
Output end, for detecting different timber moisture content at different temperatures, makes the electric current in circuit constant, by signal by constant-current source
Dual amplification is carried out after the 3rd electrochemical capacitor and the 4th electrochemical capacitor in parallel are filtered, makes the data measured more accurate
Really.
Set up and connected by the 4th potentiometer between first amplifier and the second amplifier, the 4th potentiometer
The output end of one end and the first amplifier is set up and be connected, the other end ground connection of the 4th potentiometer, the sliding end of the 4th potentiometer and
The in-phase input end of second amplifier sets up connection, by the numerical value for adjusting the 4th potentiometer, it is ensured that the working condition of circuit.
First constant-current source includes the 3rd amplifier, the 4th resistance and the 5th resistance, the power output end and the 3rd
The in-phase input end of amplifier sets up connection, the 4th resistance be attempted by the 3rd amplifier in-phase input end and output end it
Between, the 5th resistance is attempted by between the inverting input of the 3rd amplifier and output end, and circuit structure is simple, low in energy consumption, precision
Height, working stability.
Second constant-current source includes the 4th amplifier, the 6th resistance and the 7th resistance, the power output end and the 4th
The in-phase input end of amplifier sets up connection, the 6th resistance be attempted by the 4th amplifier in-phase input end and output end it
Between, the 7th resistance is attempted by between the inverting input of the 4th amplifier and output end, the second constant-current source and the first constant-current source knot
Structure is identical, makes circuit symmetry good, and working stability is convenient for changing replacement.
The 5th potentiometer, the one of the 5th potentiometer P5 are provided between the output end of first incoming end and the second constant-current source
End is set up with the first incoming end and is connected, and the 5th potentiometer P5 other end is set up with the output end of the second constant-current source and is connected, and the 5th
Potentiometer P5 sliding end is set up with the 6th resistance R6 one end and is connected, electricity between the second constant-current source of regulation and the first incoming end
Resistance, plays good partial pressure effect.
Moisture content detection check method, including two pieces of timber models are taken, utilize weight method experiment, second by first piece
Block is measured using moisture content detection check device, and step is as follows：
Step one, second piece of timber model is accessed into detection means using probe, the output after detecting circuit through moisture content
Terminal voltage signal, voltage signal is input in A/D modular converters, and converted output signal, which enters, carries out data in CPLD chips
Handle and deliver to display screen；
Step 2: second piece of timber model cut-in temperature is detected into circuit using temperature sensor, temperature sensing circuit
Output voltage signal carries out data processing and delivers to display through in A/D modular converters, converted signal enters in CPLD chips
Screen；
Step 3: access verifies resistance between moisture content detects the input of circuit, regulation verifies the resistance value of resistance,
Make the data that it shows on a display screen after calibration equipment identical with the data in step one；
Step 4: access verifies resistance between the input of temperature sensing circuit, the resistance value of regulation verification resistance makes
Its data shown on a display screen after calibration equipment is identical with the data in step 2；
Step 5: by the water cut value input validation device for the tested timber model tested by weight method and being shown
Show, and all data of the step one into step 4 are preserved.
The present invention has the following effects that compared with prior art：The moisture content of the present invention detects the voltage-stablizer and first of circuit
Triode constitutes voltage-stabilized power supply, and the first triode is effectively reduced the fluctuation of voltage, while second resistance 3rd resistor and the
The connection of two electrochemical capacitors serves good protective effect, prevents voltage excessive suddenly, is circuit with stable voltage, detection
Signal amplifies detection signal after the 3rd triode and the second triode, and amplified signal is carried out after just filtering by filter capacitor
Further signal amplification is carried out by FET, while the circuit of front stage is mutually matched, the second potentiometer and the first filtering
Electric capacity is in parallel, can filter out the noise signal in signal, and the present invention can detect the input signal of Larger Dynamic scope, detect numerical value
It is more accurate, the measurement for different tree species moisture content at different temperatures is realized, and to different temperatures different water cut
The moisture content of rate is verified, using the inventive method, and the present invention can detect that different tree species contain in different temperatures difference
Timber measurement resistance under the conditions of water rate, and the moisture content of different temperatures different water cut is demarcated；The present invention is also
Existing device for testing moisture content of wood can be verified, be demarcated.
Brief description of the drawings
Fig. 1 is the overall structure block diagram of the present invention；
Fig. 2 is moisture content detection circuit diagram；
Fig. 3 is temperature sensing circuit figure；
Fig. 4 moisture content detection check method flow diagrams.
Wherein E1, the first test side, E2, the second test side, E3, the first incoming end, E4, the second incoming end, C1, the first electricity
Solve electric capacity, C2, the second electrochemical capacitor, C3, the first filter capacitor, C4, the second filter capacitor, C5, the 3rd electrochemical capacitor, C6, the
Four electrochemical capacitors, D, voltage-stablizer, F, operational amplifier, F1, the first amplifier, F2, the second amplifier, F3, the 3rd amplifier,
F4, the 4th amplifier, P1, the first potentiometer, P2, the second potentiometer, P3, the 3rd potentiometer, P4, the 4th potentiometer, P5, the 5th
Potentiometer, R1, first resistor, R2, second resistance, R3,3rd resistor, R4, the 4th resistance, R5, the 5th resistance, R6, the 6th electricity
Resistance, R7, the 7th resistance, T1, the first triode, the triodes of T2 second, T3, the 3rd triode, T4, FET.
Embodiment
The embodiment of the present invention is described with reference to the drawings：The moisture content detection check device bag of present embodiment
Power supply, sensing part, data processing section and display screen are included, the sensing part is included at probe and temperature sensor, data
Reason part includes moisture content detection circuit, temperature sensing circuit, A/D modular converters, CPLD chips, and the moisture content detects circuit
Including the first test side E1, the second test side E2, the first triode T1, the second triode T2, the 3rd triode T3, FET
T4, the first potentiometer P1, the second potentiometer P2, the 3rd potentiometer P3, voltage-stablizer D, first resistor R1, second resistance R2, the 3rd
Resistance R3, the first electrochemical capacitor C1, the second electrochemical capacitor C2, the first filter capacitor C3, the second filter capacitor C4 and operation amplifier
Device F, the output end of power supply connects the first triode T1 colelctor electrode, between the first triode T1 colelctor electrode and emitter stage and connects
There are first resistor R1 and the first electrochemical capacitor C1, with the second electrochemical capacitor C2 after second resistance R2 and 3rd resistor the R3 series connection
And be connected between the first triode T1 emitter stage and base stage, the input of the voltage-stablizer D and the first triode T1 base
Pole is connected, and voltage-stablizer D output end and the first electrochemical capacitor C1 negative pole foundation are connected, and voltage-stablizer D control end is connected to the
Between two resistance R2 and 3rd resistor R3, the first triode T1 emitter stage connects the first potentiometer P1 one end, first respectively
Filter capacitor C3 one end and operational amplifier F in-phase input end, the first potentiometer P1 sliding end respectively with the second current potential
Device P2 one end and sliding end connection, the second potentiometer P2 other end and the first filter capacitor C3 other end are and field-effect
Pipe T4 source electrode sets up connection, and FET T4 grid is sequentially connected the second triode T2 base stage and the 3rd triode T3
It is connected after emitter stage with the second test side E2, the emitter stage of the second triode T2 and the 3rd triode T3 base stage are set up and connected
Connect, FET T4 grid is set up by the second filter capacitor C4 with the first test side E1 to be connected, the first test side E1
It is that moisture content detects circuit input end with the second test side E2, operational amplifier F output end detects the defeated of circuit for moisture content
Go out end；
The probe connects the first test side E1 and the second test side E2, temperature sensor cut-in temperature detection electricity respectively
Road, the output end of moisture content detection circuit and the output end of temperature sensing circuit access A/D modular converters, A/D modular converters
Output end and CPLD chips set up and be connected, the output end of CPLD chips is connected with display screen foundation.
The 3rd potentiometer P3, the 3rd electricity are provided between the emitter stage of the second test side E2 and the 3rd triode T3
Position device P3 one end is connected with the second test side E2 foundation, the 3rd potentiometer the P3 other end and sliding end with the 3rd triode
T3 emitter stage sets up connection.
The temperature sensing circuit include the first incoming end E3, the second incoming end E4, the first constant-current source, the second constant-current source,
3rd electrochemical capacitor C5, the 4th electrochemical capacitor C6, the first amplifier F1 and the second amplifier F2, first constant-current source and second
The input of constant-current source is set up with power input be connected respectively, the output end of the first constant-current source successively with the second incoming end E4,
Inverting input after the negative pole connection of 3rd electrochemical capacitor C5 negative pole and the 4th electrochemical capacitor C6 with the first amplifier F1 is built
Vertical connection, the output end of the second constant-current source is electric with the first incoming end E3, the 3rd electrochemical capacitor C5 positive pole and the 4th electrolysis successively
Set up and be connected with the first amplifier F1 in-phase input end after the positive pole connection for holding C6, the first amplifier F1 output end second is put
Big device F2 in-phase input end sets up connection, the first incoming end E3 and the input that the second incoming end E4 is temperature sensing circuit
End, the second amplifier F2 output end is the output end of temperature sensing circuit.
Set up and connected by the 4th potentiometer P4 between the first amplifier F1 and the second amplifier F2, the 4th electricity
Position device P4 one end is set up with the first amplifier F1 output end and is connected, the 4th potentiometer P4 other end ground connection, the 4th current potential
Device P4 sliding end is set up with the second amplifier F2 in-phase input end and is connected.
First constant-current source includes the 3rd amplifier F3, the 4th resistance R4 and the 5th resistance R5, the power output end
Set up and be connected with the 3rd amplifier F3 in-phase input end, the 4th resistance R4 is attempted by the 3rd amplifier F3 homophase input
Between end and output end, the 5th resistance R5 is attempted by between the 3rd amplifier F3 inverting input and output end.
Second constant-current source includes the 4th amplifier F4, the 6th resistance R6 and the 7th resistance R7, the power output end
Set up and be connected with the 4th amplifier F4 in-phase input end, the 6th resistance R6 is attempted by the 4th amplifier F4 homophase input
Between end and output end, the 7th resistance R7 is attempted by between the 4th amplifier F4 inverting input and output end.
The 5th potentiometer P5, the 5th potentiometer P5 are provided between the output end of the first incoming end E3 and the second constant-current source
One end and the first incoming end set up and be connected, the 5th potentiometer P5 other end is connected with the output end foundation of the second constant-current source,
5th potentiometer P5 sliding end is set up with the 6th resistance R6 one end and is connected.
Two pieces of timber models are taken, by first piece using weight method experiment, second piece utilizes moisture content detection check dress
Put and measure, step is as follows：
Step one, second piece of timber model is accessed into detection means using probe, the output after detecting circuit through moisture content
Terminal voltage signal, voltage signal is input in A/D modular converters, and converted output signal, which enters, carries out data in CPLD chips
Handle and deliver to display screen；
Step 2: second piece of timber model cut-in temperature is detected into circuit using temperature sensor, temperature sensing circuit
Output voltage signal carries out data processing and delivers to display through in A/D modular converters, converted signal enters in CPLD chips
Screen；
Step 3: access verifies resistance between moisture content detects the input of circuit, regulation verifies the resistance value of resistance,
Make the data that it shows on a display screen after calibration equipment identical with the data in step one；
Step 4: access verifies resistance between the input of temperature sensing circuit, the resistance value of regulation verification resistance makes
Its data shown on a display screen after calibration equipment is identical with the data in step 2；
Step 5: by the water cut value input validation device for the tested timber model tested by weight method and being shown
Show, and all data of the step one into step 4 are preserved.
Claims (3)
1. a kind of moisture content detection check device, including power supply, sensing part, data processing section and display screen, it is special
Levy and be：The sensing part includes probe and temperature sensor, and data processing section includes moisture content detection circuit, temperature inspection
Slowdown monitoring circuit, A/D modular converters, CPLD chips, the moisture content detection circuit include the first test side (E1), the second test side
(E2), the first triode (T1), the second triode (T2), the 3rd triode (T3), FET (T4), the first potentiometer
(P1), the second potentiometer (P2), the 3rd potentiometer (P3), voltage-stablizer (D), first resistor (R1), second resistance (R2), the 3rd electricity
Hinder (R3), the first electrochemical capacitor (C1), the second electrochemical capacitor (C2), the first filter capacitor (C3), the second filter capacitor (C4) and
Operational amplifier (F), the output end of power supply connects the colelctor electrode of the first triode (T1), the colelctor electrode of the first triode (T1) with
Between emitter stage and it is connected to first resistor (R1) and the first electrochemical capacitor (C1), the second resistance (R2) and 3rd resistor (R3)
With the second electrochemical capacitor (C2) and being connected between the emitter stage of the first triode (T1) and base stage, the voltage-stablizer after series connection
(D) input is connected with the base stage of the first triode (T1), the output end of voltage-stablizer (D) and bearing for the first electrochemical capacitor (C1)
Connection is set up in pole, and the control end of voltage-stablizer (D) is connected between second resistance (R2) and 3rd resistor (R3), the first triode
(T1) emitter stage connects the first potentiometer (P1) one end, one end of the first filter capacitor (C3) and operational amplifier respectively
(F) in-phase input end, the sliding end of the first potentiometer (P1) is connected with one end of the second potentiometer (P2) and sliding end respectively,
The other end of second potentiometer (P2) and the other end of the first filter capacitor (C3) are set up with the source electrode of FET (T4) to be connected
Connect, the grid of FET (T4) be sequentially connected after the emitter stage of the base stage of the second triode (T2) and the 3rd triode (T3) with
Second test side (E2) is connected, and the emitter stage of second triode (T2) is set up with the base stage of the 3rd triode (T3) and is connected,
The grid of FET (T4) is set up with the first test side (E1) by the second filter capacitor (C4) and is connected, first test side
(E1) and the second test side (E2) is that moisture content detects circuit input end, the output end of operational amplifier (F) is moisture content detection
The output end of circuit；
The probe connects the first test side (E1) and the second test side (E2), temperature sensor cut-in temperature detection electricity respectively
Road, the output end of moisture content detection circuit and the output end of temperature sensing circuit access A/D modular converters, A/D modular converters
Output end and CPLD chips set up and be connected, the output end of CPLD chips is connected with display screen foundation；
The temperature sensing circuit include the first incoming end (E3), the second incoming end (E4), the first constant-current source, the second constant-current source,
3rd electrochemical capacitor (C5), the 4th electrochemical capacitor (C6), the first amplifier (F1) and the second amplifier (F2), first constant current
The input of source and the second constant-current source is set up with power input be connected respectively, and the output end of the first constant-current source connects with second successively
Enter after end (E4), the negative pole connection of the negative pole of the 3rd electrochemical capacitor (C5) and the 4th electrochemical capacitor (C6) with the first amplifier (F1)
Inverting input set up connection, the output end of the second constant-current source successively with the first incoming end (E3), the 3rd electrochemical capacitor (C5)
Positive pole and the 4th electrochemical capacitor (C6) positive pole connection after set up and be connected with the in-phase input end of the first amplifier (F1), first
The in-phase input end of the amplifier of output end second (F2) of amplifier (F1) sets up connection, first incoming end (E3) and second
Incoming end (E4) is the input of temperature sensing circuit, and the output end of the second amplifier (F2) is the output of temperature sensing circuit
End；
Second constant-current source includes the 4th amplifier (F4), the 6th resistance (R6) and the 7th resistance (R7), the power supply output
Hold to set up with the in-phase input end of the 4th amplifier (F4) and be connected, the 6th resistance (R6) is attempted by the 4th amplifier (F4)
Between in-phase input end and output end, the 7th resistance (R7) be attempted by the 4th amplifier (F4) inverting input and output end it
Between；
The 5th potentiometer (P5), the 5th potentiometer are provided between first incoming end (E3) and the output end of the second constant-current source
(P5) one end is set up with the first incoming end and is connected, and the other end of the 5th potentiometer (P5) and the output end of the second constant-current source are set up
Connection, the sliding end of the 5th potentiometer (P5) is set up with one end of the 6th resistance (R6) and is connected.
2. a kind of moisture content detection check device according to claim 1, it is characterised in that：Second test side
(E2) between the emitter stage of the 3rd triode (T3) be provided with the 3rd potentiometer (P3), one end of the 3rd potentiometer (P3) with
Connection, the transmitting of the other end and sliding end of the 3rd potentiometer (P3) with the 3rd triode (T3) are set up in second test side (E2)
Connection is set up in pole.
3. a kind of moisture content detection check device according to claim 2, it is characterised in that：First amplifier
(F1) between the second amplifier (F2) by the 4th potentiometer (P4) set up be connected, one end of the 4th potentiometer (P4) and
The output end of first amplifier (F1) sets up connection, the other end ground connection of the 4th potentiometer (P4), the cunning of the 4th potentiometer (P4)
Moved end is set up with the in-phase input end of the second amplifier (F2) and is connected.
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| CN201410812497.7A CN104483231B (en) | 2014-12-24 | 2014-12-24 | A kind of moisture content detection check device |
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| CN201410812497.7A CN104483231B (en) | 2014-12-24 | 2014-12-24 | A kind of moisture content detection check device |
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| CN104483231B true CN104483231B (en) | 2017-08-11 |
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| CN107014867A (en) * | 2017-04-17 | 2017-08-04 | 张家港市检验检测中心 | The method of resistance calibration moisture content measuring instrument indicating value |
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| US4652811A (en) * | 1983-05-03 | 1987-03-24 | K.I.T. (Medidot) Ltd. | Method for measuring liquid content in a porous medium such as soil |
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| CN2347167Y (en) * | 1998-11-04 | 1999-11-03 | 中国科学院广州能源研究所 | Wood water content rate measurer |
| CN2347166Y (en) * | 1998-11-11 | 1999-11-03 | 中国科学院大连化学物理研究所 | Calabash strip water content measurer |
| CN201653954U (en) * | 2009-11-25 | 2010-11-24 | 东北林业大学 | Lumber drying process parameter automatic detection device |
| CN203561601U (en) * | 2013-09-07 | 2014-04-23 | 昆明理工大学 | Easy electronic moisture content tester |
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| CN204302143U (en) * | 2014-12-24 | 2015-04-29 | 黑龙江省木材科学研究所 | A kind of moisture content detection check device |
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2014
- 2014-12-24 CN CN201410812497.7A patent/CN104483231B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4652811A (en) * | 1983-05-03 | 1987-03-24 | K.I.T. (Medidot) Ltd. | Method for measuring liquid content in a porous medium such as soil |
| CN2111528U (en) * | 1992-01-29 | 1992-07-29 | 戴立权 | On-line inteligence measuring instrument for grain moisture content |
| CN2347167Y (en) * | 1998-11-04 | 1999-11-03 | 中国科学院广州能源研究所 | Wood water content rate measurer |
| CN2347166Y (en) * | 1998-11-11 | 1999-11-03 | 中国科学院大连化学物理研究所 | Calabash strip water content measurer |
| CN201653954U (en) * | 2009-11-25 | 2010-11-24 | 东北林业大学 | Lumber drying process parameter automatic detection device |
| CN203561601U (en) * | 2013-09-07 | 2014-04-23 | 昆明理工大学 | Easy electronic moisture content tester |
| CN203894186U (en) * | 2014-06-05 | 2014-10-22 | 北京昆仑中大工控技术发展有限公司 | Two-wire system water sensor circuit |
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| CN104483231A (en) | 2015-04-01 |
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