CN2390203Y - Electromagnetic wave soil moisture content quick analyser - Google Patents
Electromagnetic wave soil moisture content quick analyser Download PDFInfo
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- CN2390203Y CN2390203Y CN 99243334 CN99243334U CN2390203Y CN 2390203 Y CN2390203 Y CN 2390203Y CN 99243334 CN99243334 CN 99243334 CN 99243334 U CN99243334 U CN 99243334U CN 2390203 Y CN2390203 Y CN 2390203Y
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- sheet angle
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Abstract
The utility model relates to an electromagnetic wave soil moisture content quick analyzer. According to the principle of dielectric physics, the complex dielectric constant of the soil is not only relevant to the volume and the chemical constituent of the soil, but also is relevant to the conductivity and the volume distribution uniform degree of the soil. Therefore, when the conductivity and the complex dielectric constant of three frequencies of the soil are measured, the moisture percentage of the soil can be obtained. The control circuit of the utility model comprises a power circuit, a switching circuit, an oscillating circuit, a frequency and pressure converter, an amplifier set, a converter, a CPU system, a liquid crystal display, and a probe head. The utility model has the advantages of being simple and convenient, automatic, quick, etc. existing in a TDR instrument, and also has high measuring precision and low cost, reaching the moisture of positive and negative three.
Description
The utility model relates to survey instrument, definite a kind of electromagnetic wave soil moisture tacheometer of saying so.
At present time-domain reflectomer (TDR) is a kind of novel soil moisture tester device, and it has easy to use, and finding speed is very fast, "dead" and be applicable to long-term location observation, automatically, advantage such as continuous monitoring; But the accuracy rate for not soil surveying of the same race differs greatly, and positive and negatively reaches 6.2 moisture, only is applicable at the low thick matter of conductivity, light soil and uses, and is not suitable for organic soil and heavy clay, and this instrument fetch long price, is difficult to promote.The novelty search of just present soil water measuring instrument is found more accurate and advanced instrument again.
Goal of the invention of the present utility model is to provide a kind of measuring accuracy height, applied widely, electromagnetic wave soil moisture tacheometer that cost is low.
The technical solution of the utility model is achieved in that the structure of electromagnetic wave soil moisture tacheometer comprises housing, LCD, button, switch, tripod, probe, circuit board; Control circuit comprises on its circuit board: power circuit, on-off circuit, oscillatory circuit, frequency are pressed transducer f/v, amplifier group, converter A/D, cpu system, LCD, probe; Power circuit is made up of three three end blocks 12,13,14, the negative pole of power supply links to each other with the sheet angle 1 of three end blocks 12,13, the positive pole of power supply links with the sheet angle 2 of three end blocks 12 and the sheet angle 2 of three end blocks 14 respectively, node a ' is as the output port of voltage V1, the sheet angle 2 of the sheet angle 3 of three end blocks 12 and three end blocks 13 and three end blocks 14 links and ground connection, the sheet angle 3 of three end blocks 13 is as the output port b ' of voltage V2, and the sheet angle 2 of three end blocks 14 is as the output port c ' of voltage V3; Oscillatory circuit is by oscillator MC1648, coil L, varactor D1, D2, capacitor C 1, C2, analog switch CC4051 forms, the sheet angle 1 of oscillator MC1648,14 link with port c ', the varactor D1 of coil L and negative pole butt joint, receive after the D2 parallel connection on the sheet angle 12 and 10 of oscillator MC1648, the sheet angle 12 of oscillator 1648,10 also respectively by varactor D1, D2 and probe J1 and J2 link, the sheet angle 3 of analog switch CC4051 links with the negative pole that docks varactor D1 and D2, resistance R 1, R2 and the R3 end ground connection that is together in series, and sheet angle 6 with analog switch CC4051,7,8,13 link, the sheet angle 16 of another termination analog switch CC4051 and link with port c ', resistance R 1 is connected on the sheet angle 4 of analog switch CC4051 with the contact of R2, and resistance R 2 is associated on the sheet angle 2 of analog switch CC4051 with the contact of R3.The sheet angle 3 of oscillator MC1648 presses the signal input part of transducer f/v to join with frequency, and on-off circuit comprises: analog switch CC4066, resistance R
oWith capacitor C
o, the sheet angle 14 and 1 of analog switch CC4066 meets port c ', and sheet angle 2 meets probe J1, and sheet angle 3 connects probe J2, resistance R
oWith capacitor C
oThe end points ground connection that is together in parallel, the sheet angle 4 of another end points and analog switch CC4066 joins.The amplifier group is by two direct current amplifier β
1, β
2Form direct current amplifier β
1Input end with frequently press the output terminal of transducer f/v to join, and its output terminal inserts in modulus converter A/D, direct current amplifier β
2Input end and the sheet angle 4 of analog switch CC4066 join, output terminal inserts in the modulus converter A/D.Eight sheet angles of its output port 1/0 of cpu system connect three control strip angles of analog-digital conversion a/d respectively, connect the sheet angle 13 and 5 of analog switch CC4066, connect the sheet angle 9,10,11 of analog switch CC4051, the port one of CPU/0 also has two sheet angles to meet port c ' by K switch 1, K2 respectively, and the port one of CPU/0 also meets LCD P.
The utility model is according to the dielectric physics principle, and not only when the chemical analysis of soil is relevant with their volume for the complex permittivity of soil, but also relevant with their conductivity and volume distributed median degree of uniformity.Therefore measure the conductivity of soil, measure the complex permittivity of three frequencies of soil, can draw the water percentage of soil.
At first survey the soil complex permittivity, after the instrument energising, oscillator MC1648 starting oscillation, behind two play buttons pressing instrument, it is K switch 1, K2 connects, 1/0 mouthful of line of cpu system is at first given the sheet angle 9 of analog switch CC4051,11 add voltage, the passage at the sheet angle 6 of analog switch CC4051 is connected at this moment, and from the sheet angle 3 output a DC voltage that is directly proportional with institute's making alive on the sheet angle 6, this voltage is added in the varactor D1 that reversal connection, on the D2, because institute's making alive is zero, so varactor D1, D2 node capacitance maximum, the oscillation frequency of oscillator MC1648 is minimum; Be separated by about 1 second cpu system 1/0 mouthful of line add voltage for the sheet angle 10,11 of analog switch CC4051, this moment, a voltage that is directly proportional with institute's making alive on the sheet angle 2 was exported at the sheet angle 3 of analog switch CC4051, and this voltage makes the oscillation frequency of oscillator MC1648 improve about 1,000,000 than the former; Be separated by about 1 second, 1/0 mouthful of line of cpu system all adds voltage for the sheet angle 9,10,11 of analog switch CC4051 again, and 3 output voltages in sheet angle this moment are directly proportional with voltage on the sheet angle 4, and the oscillation frequency of oscillator MC1648 improves about 1,000,000 again; Tired input end of pressing transducer F/V is sent in the signal timesharing of above-mentioned three different frequencies of oscillator MC1648, presses transducer F/V with three DC voltage of timesharing output frequently.Because probe J1, J2 are connected in the frequency selection network of oscillator MC1648, therefore the soil complex permittivity between two probes will change the oscillation frequency of oscillator MC1648, and the frequency of signal of three frequencies of its output is all changed with the complex permittivity of soil.The DC voltage of pressing transducer F/V output frequently is again through amplifier β
1Deliver to after the amplification on the modulus converter A/D, the digital quantity that analog quantity converts to is delivered on the data bus of cpu system, at last data are delivered to LCDs P and shown.
The second pacing soil conductivity, after having surveyed the soil complex permittivity, 1/0 mouthful of line of cpu system adds voltage for again the sheet angle 5,13 of analog switch CC4066 simultaneously, passage between the sheet angle 1 and 2,3 and 4 is connected simultaneously, port c's ' is added in probe J1, J2 last (promptly being added on the soil), resistance R with voltage by resistance R like this
oBe a divider resistance, the voltage and the soil conductivity of its decomposition are inversely proportional to, and the voltage of its decomposition is delivered to amplifier β
2On, to give modulus converter A/D after the amplification again and carry out analog to digital conversion, this digital quantity after the conversion is delivered on the data bus of cpu system, gives LCD P again and shows.
Last display P demonstrates soil moisture content.
The utlity model has the advantage that TDR instrument such as easy, automatic, quick is possessed, the measuring accuracy height can reach positive and negative 3 moisture simultaneously, and is applied widely, cheap, is suitable for promoting.
Fig. 1 is the structural representation of electromagnetic wave soil moisture tacheometer;
1 is housing, and 2 is LCD, and 3 is button, and 4 is switch, and 5 is tripod, and 6 are probe, and 7 is circuit board;
Fig. 2 is the circuit block diagram of electromagnetic wave soil moisture tacheometer;
Fig. 3 is the circuit diagram of the power circuit of electromagnetic wave soil moisture tacheometer;
Fig. 4 is the circuit diagram of electromagnetic wave soil moisture tacheometer.
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the structure of electromagnetic wave soil moisture tacheometer comprises housing 1, LCD 2, button 3, switch 4, tripod 5, probe 6, circuit board 7.
As shown in Figure 2, control circuit comprises on its circuit board 7: power circuit 8, on-off circuit 9, oscillatory circuit 10, frequency are pressed transducer f/v, amplifier group 11, modulus converter A/D, cpu system, LCD P, probe;
As shown in Figure 3, power circuit 8 is made up of three three end blocks 12,13,14, the negative pole of power supply links to each other with the sheet angle 1 of three end blocks 12,13, the positive pole of power supply links with the sheet angle 2 of three end blocks 12 and the sheet angle 2 of three end blocks 14 respectively, node a ' is as the output port of voltage V1, the sheet angle 2 of the sheet angle 3 of three end blocks 12 and three end blocks 13 and three end blocks 14 links and ground connection, and the sheet angle 3 of three end blocks 13 is as the output port b ' of voltage V2, and the sheet angle 2 of three end blocks 14 is as the output port c ' of voltage V3.
As shown in Figure 4, oscillatory circuit 10 is by oscillator MC1648, coil L, varactor D1, D2, capacitor C 1, C2, analog switch CC4051 forms, the sheet angle 1 of oscillator MC1648,14 link with port c ', the varactor D1 of coil L and negative pole butt joint, receive after the D2 parallel connection on the sheet angle 12 and 10 of oscillator MC1648, the sheet angle 12 of oscillator 1648,10 also respectively by varactor D1, D2 and probe J1 and J2 link, the sheet angle 3 of analog switch CC4051 links with the negative pole that docks varactor D1 and D2, resistance R 1, R2 and the R3 end ground connection that is together in series, and sheet angle 6 with analog switch CC4051,7,8,13 link, the sheet angle 16 of another termination analog switch CC4051 and link with port c ', resistance R 1 is connected on the sheet angle 4 of analog switch CC4051 with the contact of R2, and resistance R 2 is associated on the sheet angle 2 of analog switch CC4051 with the contact of R3.The sheet angle 3 of oscillator MC1648 presses the signal input part of transducer f/v to join with frequency, and on-off circuit 9 comprises: analog switch CC4066, resistance R
oWith capacitor C
o, the sheet angle 14 and 1 of analog switch CC4066 meets port c ', and sheet angle 2 meets probe J1, and sheet angle 3 connects probe J2, resistance R
oWith capacitor C
oThe end points ground connection that is together in parallel, the sheet angle 4 of another end points and analog switch CC4066 joins.Amplifier group 11 is by two direct current amplifier β
1, β
2Form direct current amplifier β
1Input end with frequently press the output terminal of transducer f/v to join, and its output terminal inserts in modulus converter A/D, direct current amplifier β
2Input end and the sheet angle 4 of analog switch CC4066 join, output terminal inserts in the modulus converter A/D.Eight sheet angles of its output port 1/0 of cpu system connect three control strip angles of analog-digital conversion a/d respectively, connect the sheet angle 13 and 5 of analog switch CC4066, connect the sheet angle 9,10,11 of analog switch CC4051, the port one of CPU/0 also has two sheet angles to meet port c ' by K switch 1, K2 respectively, and the port one of CPU/0 also meets LCD P.
The utility model is according to the dielectric physics principle, and not only when the chemical analysis of soil is relevant with their volume for the complex permittivity of soil, but also relevant with their conductivity and volume distributed median degree of uniformity.Therefore measure the conductivity of soil, measure the complex permittivity of three frequencies of soil, can draw the water percentage of soil.
At first survey the soil complex permittivity, after the instrument energising, oscillator MC1648 starting oscillation, behind two play buttons pressing instrument, it is K switch 1, K2 connects, 1/0 mouthful of line of cpu system is at first given the sheet angle 9 of analog switch CC4051,11 add voltage, the passage at the sheet angle 6 of analog switch CC4051 is connected at this moment, and from the sheet angle 3 output a DC voltage that is directly proportional with institute's making alive on the sheet angle 6, this voltage is added in the varactor D1 that reversal connection, on the D2, because institute's making alive is zero, so varactor D1, D2 node capacitance maximum, the oscillation frequency of oscillator MC1648 is minimum; Be separated by about 1 second cpu system 1/0 mouthful of line add voltage for the sheet angle 10,11 of analog switch CC4051, this moment, a voltage that is directly proportional with institute's making alive on the sheet angle 2 was exported at the sheet angle 3 of analog switch CC4051, and this voltage makes the oscillation frequency of oscillator MC1648 improve about 1,000,000 than the former; Be separated by about 1 second, 1/0 mouthful of line of cpu system all adds voltage for the sheet angle 9,10,11 of analog switch CC4051 again, and 3 output voltages in sheet angle this moment are directly proportional with voltage on the sheet angle 4, and the oscillation frequency of oscillator MC1648 improves about 1,000,000 again; The input end of pressing transducer F/V is frequently sent in the signal timesharing of above-mentioned three different frequencies of oscillator MC1648, presses transducer F/V with three DC voltage of timesharing output frequently.Because probe J1, J2 are connected in the frequency selection network of oscillator MC1648, therefore the soil complex permittivity between two probes will change the oscillation frequency of oscillator MC1648, and the frequency of signal of three frequencies of its output is all changed with the complex permittivity of soil.The DC voltage of pressing transducer F/V output frequently is again through amplifier β
1Deliver to after the amplification on the modulus converter A/D, the digital quantity that analog quantity converts to is delivered on the data bus of cpu system, at last data are delivered to LCDs P and shown.
The second pacing soil conductivity, after having surveyed the soil complex permittivity, 1/0 mouthful of line of cpu system adds voltage for again the sheet angle 5,13 of analog switch CC4066 simultaneously, passage between the sheet angle 1 and 2,3 and 4 is connected simultaneously, port c's ' is added in probe J1, J2 last (promptly being added on the soil), resistance R with voltage by resistance R like this
oBe a divider resistance, the voltage and the soil conductivity of its decomposition are inversely proportional to, and the voltage of its decomposition is delivered to amplifier β
2On, to give modulus converter A/D after the amplification again and carry out analog to digital conversion, this digital quantity after the conversion is delivered on the data bus of cpu system, gives LCD P again and shows.
Last display P demonstrates soil moisture content.
Claims (1)
1, electromagnetic wave soil moisture tacheometer, structure comprise housing (1), LCD (2), button (3), switch (4), tripod (5), probe (6), circuit board (7); It is characterized in that: the control circuit on the circuit board (7) comprises: power circuit (8), on-off circuit (9), oscillatory circuit (10), frequency are pressed transducer f/v, amplifier group (11), modulus converter A/D, cpu system, LCD P, probe;
Power circuit (8) is made up of three three end blocks (12), (13), (14), the negative pole of power supply links to each other with the sheet angle 1 of three end blocks (12), (13), the positive pole of power supply links with the sheet angle 2 of three end blocks (12) and the sheet angle 2 of three end blocks (14) respectively, node a ' is as the output port of voltage V1, the sheet angle 2 of the sheet angle 3 of three end blocks (12) and three end blocks (13) and three end blocks (14) links and ground connection, the sheet angle 3 of three end blocks (13) is as the output port b ' of voltage V2, and the sheet angle 2 of three end blocks (14) is as the output port c ' of voltage V3;
Oscillatory circuit (10) is by oscillator MC1648, coil L, varactor D1, D2, capacitor C 1, C2, analog switch CC4051 forms, the sheet angle 1 of oscillator MC1648,14 link with port c ', the varactor D1 of coil L and negative pole butt joint, receive after the D2 parallel connection on the sheet angle 12 and 10 of oscillator MC1648, the sheet angle 12 of oscillator 1648,10 also respectively by varactor D1, D2 and probe J1 and J2 link, the sheet angle 3 of analog switch CC4051 links with the negative pole that docks varactor D1 and D2, resistance R 1, R2 and the R3 end ground connection that is together in series, and sheet angle 6 with analog switch CC4051,7,8,13 link, the sheet angle 16 of another termination analog switch CC4051 and link with port c ', resistance R 1 is connected on the sheet angle 4 of analog switch CC4051 with the contact of R2, and resistance R 2 is associated on the sheet angle 2 of analog switch CC4051 with the contact of R3;
The sheet angle 3 of oscillator MC1648 presses the signal input part of transducer f/v to join with frequency; On-off circuit (9) comprising: analog switch CC4066, resistance R and capacitor C, and the sheet angle 14 and 1 of analog switch CC4066 meets port c ', and sheet angle 2 meets probe J1, and sheet angle 3 connects probe J2, resistance R
oWith capacitor C
oThe end points ground connection that is together in parallel, the sheet angle 4 of another end points and analog switch CC4066 joins;
Amplifier group (11) is by two direct current amplifier β
1, β
2Form direct current amplifier β
1Input end with frequently press the output terminal of transducer f/v to join, and its output terminal inserts in modulus converter A/D, direct current amplifier β
2Input end and the sheet angle 4 of analog switch CC4066 join, output terminal inserts in the modulus converter A/D;
Eight sheet angles of its output port 1/0 of cpu system connect three control strip angles of analog-digital conversion a/d respectively, connect the sheet angle 13 and 5 of analog switch CC4066, connect the sheet angle 9,10,11 of analog switch CC4051, the port one of CPU/0 also has two sheet angles to meet port c ' by K switch 1, K2 respectively, and the port one of CPU/0 also meets LCD P.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99243334 CN2390203Y (en) | 1999-09-22 | 1999-09-22 | Electromagnetic wave soil moisture content quick analyser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99243334 CN2390203Y (en) | 1999-09-22 | 1999-09-22 | Electromagnetic wave soil moisture content quick analyser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2390203Y true CN2390203Y (en) | 2000-08-02 |
Family
ID=34029654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99243334 Expired - Fee Related CN2390203Y (en) | 1999-09-22 | 1999-09-22 | Electromagnetic wave soil moisture content quick analyser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2390203Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419420C (en) * | 2005-08-02 | 2008-09-17 | 中国农业大学 | Method and sensor for synchronous real time measuring water content and conductivity of soil |
| CN100419439C (en) * | 2005-08-26 | 2008-09-17 | 中国农业大学 | Multi-purpose vehicle mounted soil specific conductivity real-time tester |
| CN101281152B (en) * | 2008-06-03 | 2012-05-30 | 华南农业大学 | Soil moisture sensor |
| CN103472127A (en) * | 2013-08-13 | 2013-12-25 | 欧传景 | Rapid and quantitative detection sensor for unsaturated soil's soil-water characteristics and its application |
| CN108444534A (en) * | 2018-05-09 | 2018-08-24 | 中国农业大学 | A kind of Soil moisture and temperature detection device |
-
1999
- 1999-09-22 CN CN 99243334 patent/CN2390203Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419420C (en) * | 2005-08-02 | 2008-09-17 | 中国农业大学 | Method and sensor for synchronous real time measuring water content and conductivity of soil |
| CN100419439C (en) * | 2005-08-26 | 2008-09-17 | 中国农业大学 | Multi-purpose vehicle mounted soil specific conductivity real-time tester |
| CN101281152B (en) * | 2008-06-03 | 2012-05-30 | 华南农业大学 | Soil moisture sensor |
| CN103472127A (en) * | 2013-08-13 | 2013-12-25 | 欧传景 | Rapid and quantitative detection sensor for unsaturated soil's soil-water characteristics and its application |
| CN108444534A (en) * | 2018-05-09 | 2018-08-24 | 中国农业大学 | A kind of Soil moisture and temperature detection device |
| CN108444534B (en) * | 2018-05-09 | 2019-10-22 | 中国农业大学 | A kind of Soil moisture and temperature detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |