CN201974399U - Matrix humidity and conductivity in-situ detector - Google Patents
Matrix humidity and conductivity in-situ detector Download PDFInfo
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- CN201974399U CN201974399U CN2010202932883U CN201020293288U CN201974399U CN 201974399 U CN201974399 U CN 201974399U CN 2010202932883 U CN2010202932883 U CN 2010202932883U CN 201020293288 U CN201020293288 U CN 201020293288U CN 201974399 U CN201974399 U CN 201974399U
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Abstract
The utility model discloses a matrix humidity and conductivity in-situ detector, which comprises an integrated electrode sensor probe (1), a sensor signal conditioning circuit (2) and a signal processing control circuit (3); the integrated electrode sensor probe (1) comprises four probes (11, 12, 13 and 14) at intervals of 20 mm; the integrated electrode sensor probe (1) and the sensor signal conditioning circuit (2) are insulated and encapsulated in a casing (4), and the signal processing control circuit (3) is encapsulated in a casing (5); and the casing (4) and the casing (5) are connected through a group of cables (6). The matrix humidity and conductivity in-situ detector has the advantages of simple structure, conveniences for manufacture, capability of realizing multi-parameter measurement simultaneously, more accurate measurement results, and stronger adaptability.
Description
Technical field
The utility model relates to a kind of detector, relates in particular to a kind of matrix multiparameter in situ detection instrument, belongs to technical field of measurement and test, is mainly used in soilless culture process mesostroma physicochemical property in situ detection.
Background technology
Soil humidity also is that the water cut in the matrix is the most important general information of matrix; The matrix conductivity has comprised the abundant information of matrix nutrient and physicochemical property, can reflect salinity, moisture, the content of organic matter, organic substrate quality structure and the isoparametric size of porosity in the matrix to some extent; The matrix salt content is a physical parameter of matrix, and it has great importance for the plant growth, and the matrix salt status has significant effects to matrix environment simultaneously.Therefore effectively obtaining soil humidity, conductivity (EC) and salinity has great importance for reasonably irrigating in the plant soil-less culturing process, applying fertilizer.
Because matrix is bigger with soil diversity on physicochemical character, and the physicochemical character of various matrix also exists than big-difference, at present dedicated substrate moisture, EC and salinity in situ detection instrument and equipment lack, to the research of the in site measurement of water content of substrate, conductivity (EC) and salinity also seldom.
Ripe at present soil water-containing measuring method has NEUTRON METHOD, time domain reflectometry (TDR), frequency domain reflectometry (FD).Though utilize the soil moisture measurement sensor of these method developments successfully to be applied to have certain limitation in scientific research and the production.As neutron measurement soil moisture instrument, because radioactive source is arranged, require the pre-buried aluminum casing of putting into inserting tube well of in-site measurement point, shield.Otherwise cause radiation leakage, be detrimental to health, contaminated environment.Time domain and frequency domain reflectometry soil water measuring instrument can be realized measuring in real time fast, and the precision height because technology realizes that difficulty is big, therefore costs an arm and a leg.General soil water-containing flowmeter or meter at a low price, as passive soil moisture tacheometer of utility model patent (CN2339988Y) and Related product, function singleness often, pointer-type indication, no digital display or digital interface; Measuring error is big, poor stability, and all more than 10%, application is very limited for measuring error and repetitive error.
The method that soil conductivity is measured mainly contains four-end method and inductive electromagnetic method.Present four-end method has probe electrode formula and ring electrode formula, measuring principle, the relative maturation with practical application of mathematical model.The probe electrode formula as utility model patent (CN2627503), discloses a kind of soil conductivity real-time detector, volume is bigger, distance L 1 between middle two probes is 150-300mm, and the distance L 2 between two probes in the outside is 450-650mm, and is portable poor.The ring electrode formula, as utility model patent (CN200972465Y), a kind of four electrode soil salt determination sensor and analyzers thereof, EC/ ℃ of analyzer HI98331 of product tailored version pen type etc., 120mm-150mm pierces the formula probe designs, can be used for the direct mensuration of soil conductivity, volume is less, but measurement accuracy, stability and not good in actual applications for different levels deep soil mensuration adaptability.The EM38 that has Canada to produce based on the typical representative products of the contactless design of electromagnetic induction principle.EM38 can finish measurement by the transversal scanning to the farmland, but also costs an arm and a leg, and can't adapt to the needs of the extensive agricultural production of China.
The utility model content
The purpose of this utility model is to remedy present matrix in situ detection instrument and lacks, and overcome function singleness that above-mentioned soil detecting instrument exists, cost an arm and a leg, problem and shortage such as bad adaptability, portable soil humidity, the conductivity in situ detection instrument of the present substrate culture present situation of suitable China that a kind of volume is less, cost performance is high are disclosed.
To achieve these goals, a kind of soil humidity that the utility model provides, conductivity in situ detection instrument are made up of Integrated electrode sensor probe, sensor signal conditioning circuit, signal processing control unit, and the probe that the Integrated electrode sensor probe is 20mm by four spacings is formed; Integrated electrode sensor probe and sensor signal conditioning circuit insulation-encapsulated are in housing, and signal processing control unit is encapsulated in the housing; Housing is connected by one group of cable with housing.
Integrated electrode sensor probe described in the utility model by the metal probe that is arranged on Integrated electrode sensor probe end, be sleeved on the metal coupling unit on the metal probe and the dead ring that is sleeved on the metal coupling unit is formed.
Sensor signal conditioning circuit described in the utility model is made up of power-switching circuit, signal extraction conversion and amplifying circuit, relay control four-end method survey conductivity excitation power supply circuit, and described signal processing control unit is made up of single-chip microcomputer SPCE061A, LCD, 4 * 4 keyboards and relay drive circuit; Power-switching circuit is converted to signal processing control unit and signal extraction converter amplifier circuit power supply on the one hand with the 15V dry cell, be converted to the triangular wave alternating current of frequency 300Hz on the other hand, and, provide four-end method to survey the ac-excited power supply of the Integrated electrode sensor probe of conductivity by relay control; Signal extracting circuit detects the triangle wave voltage signal U0 of precision resistance R by integrated transporting discharging chip LM324 and detects triangle wave voltage signal U1 on inboard two electrodes, and has added bias voltage 1.24V at input end in the same way; Signaling conversion circuit becomes the real effective d. c. voltage signal by TRMS/DC converter chip AD736 with the triangle wave voltage conversion of signals that extracts at last, through entering the analog to digital converter of single-chip microcomputer SPCE061A behind the amplifying circuit; The single-chip microcomputer of signal processing control unit is for carrying 10 analog-digital converter function modules and 32k flash memory SPCE061A single-chip microcomputer, and its program comprises system initialization, display refreshing, keyboard scan processing, function selecting, prescription setting, measurement and query display function subprogram.
The beneficial effects of the utility model are: the water content detection probe structure is simple, and is easy to make, sets up the relation of output voltage and humidity by test; The integrated conductivity of water content detection probe is detected on four probe electrodes, realize that sensor is integrated, compact conformation can be realized measuring multiple parameters simultaneously; The relational model of soil humidity, salinity and conductivity that signal processing control unit storage experimental study obtains is measured the matrix salinity by calculating; The signal processing control unit setting of can filling a prescription is revised or is set moisture and conductivity correction factor according to different substrates, makes measurement result more accurate, and adaptability is stronger.
Description of drawings
Fig. 1 is that soil humidity of the present utility model, conductivity in situ detection instrument are formed structural drawing
Fig. 2 is a water supply in media detector probe structural drawing of the present utility model
Fig. 3 is soil humidity of the present utility model, conductivity in situ detection instrument circuit composition diagram
Fig. 4 is a circuit diagram of measuring conductivity
Fig. 5 is the program flow diagram of soil humidity of the present utility model, conductivity in situ detection instrument information processing control module
Fig. 6 is matrix mass water content of the present utility model and probe output voltage relation curve
Fig. 7 is matrix conductivity of the present utility model and probe output voltage relation curve
Fig. 8 is matrix mass water content of the present utility model, salinity and conductivity relation surface chart
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Soil humidity described in the utility model, conductivity in situ detection instrument detects principle: pass through pilot relay, ac-excited power supply is provided for a pair of probe electrode in outside, difference according to the matrix conductivity forms different electromotive forces at the matrix difference, detect the ac voltage signal at two ends by a pair of probe electrode in inside, extract electric potential difference between two electrodes by signal extracting circuit, become d. c. voltage signal by the effective value conversion circuit again, through amplifying circuit, the analog to digital converter of entering signal processing and control element (PCE), magnitude of voltage is changed into conductivity value, realize the collection of conductivity data; Utilize to detect conductivity signal four probe electrodes one of them, as the water content detection probe, the principle that electromotive force that produces between the application different metal and water supply in media content are directly proportional obtains the soil humidity signal, through amplifying circuit, the analog to digital converter of entering signal processing and control element (PCE), magnitude of voltage is changed into humidity value, realize the collection of humidity data; In signal processing control unit, processing etc. is handled, shows and preserved to acquisition time soil humidity, conductivity signal, the line data of going forward side by side at last.
As shown in Figure 1, a kind of soil humidity, conductivity in situ detection instrument, form by Integrated electrode sensor probe 1, sensor signal conditioning circuit 2, signal processing control unit 3, the probe 11 that Integrated electrode sensor probe 1 is 20mm by four spacings, probe 12, probe 13, probe 14 are formed, and wherein arbitrary while is as the water content detection probe.Integrated electrode sensor probe 1 and sensor signal conditioning circuit 2 insulation-encapsulated are in housing 4.Signal processing control unit 3 is encapsulated in the housing 5.Housing 4 is connected by one group of cable 6 with housing 5.
As shown in Figure 2, Integrated electrode sensor probe 1 described in the utility model by the metal probe 111 that is arranged on Integrated electrode sensor probe 1 end, be sleeved on the metal coupling unit 113 on the metal probe 111 and the dead ring 112 that is sleeved on the metal coupling unit 113 is formed.When probe being participated in the wet basis matter, the electromotive force that produces between metal probe 111 and 113 two kinds of different metals of metal coupling unit is by lead 115 and lead 114 outputs.
As shown in Figure 3, sensor signal conditioning circuit 2 described in the utility model comprises power-switching circuit, signal extraction conversion and amplifying circuit, relay control four-end method survey conductivity excitation power supply circuit.As shown in figs. 1 and 3, signal processing control unit 3 described in the utility model comprises single-chip microcomputer SPCE061A, LCD 7,4 * 4 keyboard 8 and relay drive circuits.
Power-switching circuit described in the utility model provides power supply and bias voltage for signal processing control unit 3 and signal extraction converter amplifier circuit on the one hand, the direct current that the 15V dry cell is provided converts the triangular wave alternating current that frequency is 300Hz on the other hand, and, provide four-end method to survey the ac-excited power supply of the Integrated electrode sensor probe 1 of conductivity by relay control.Studies show that excitation power supply causes the polarization phenomena of matrix intermediate ion easily if direct supply, influences the accuracy of matrix conductivity measurement; The frequency of excitation power supply greater than 100Hz time polarization little to measuring influence.
As shown in Figure 4, triangular wave excitation AC power is added on two lateral electrodes 11 and the electrode 14 by precision resistance R, and two medial electrodes 12 and electrode 13 detect the ac voltage signal U1 at electrode two ends.The function of signal extracting circuit is to detect the triangle wave voltage signal U0 of precision resistance R and the triangle wave voltage signal U1 on detecting electrode 12 and 13.Signal extracting circuit is realized by integrated transporting discharging chip LM324.Because LM324 integrated transporting discharging output voltage is greater than 0, therefore added bias voltage 1.24V at input end in the same way, the big I of bias voltage is set as required.The signaling conversion circuit function realizes by TRMS/DC converter chip AD736, the triangle wave voltage conversion of signals that extracts is become the real effective d. c. voltage signal, through entering the analog to digital converter of single-chip microcomputer SPCE061A behind the amplifying circuit, realize the collection of data then.
In the present embodiment, the information processing control module is selected the SPCE061A single-chip microcomputer for use, carries 10 analog-digital converter function modules and 32k flash memory, can realize data acquisition, processing and memory function.
As shown in Figure 5, the program of soil humidity described in the utility model, conductivity in situ detection instrument information processing control module comprises system initialization, display refreshing, keyboard scan processing, function selecting, prescription setting, measurement and query display function subprogram.The prescription set-up function can be provided with the constituent of measurement matrix and the parameter of ratio and data-switching needs.Measurement function is divided into automatic measurement and manual measurement.Under automatic measurement situation, single-chip microcomputer can pilot relay, acquisition time conductivity and humidity data, and, calculate salinity by there being the mathematical model of different substrates humidity, salinity and conductivity in the processing unit.Under the manual measurement situation, but independent measurement soil humidity or conductivity.
Be the utility model embodiment as shown in Figure 6, peat and vermiculite proportioning are the mass water content and the moisture probe output voltage relation curve of 1: 1 soil humidity.Adopting SPSS software that the data that experimental study obtains are carried out linear regression, is independent variable with voltage, and the mass water content of soil humidity is a dependent variable, sets up mathematical model: y=0.485*x+18.830.Wherein, y is mass water content (%), and x is voltage (mv).Soil humidity described in the utility model, conductivity in situ detection instrument convert to the actual magnitude of voltage that records according to this curved line relation, obtain the mass water content of tested matrix.
Be the utility model embodiment as shown in Figure 7, peat and vermiculite proportioning are 1: 1 matrix conductivity and probe actual output voltage ratio relation curve.Adopting SPSS software that the data that experimental study obtains are carried out linear regression, is independent variable with voltage ratio U0/U1, and the matrix conductivity is a dependent variable, sets up mathematical model: y=12.184*x-0.05.Wherein, y is conductivity (ms/cm), and x is voltage ratio U0/U1.Soil humidity described in the utility model, conductivity in situ detection instrument convert to the actual voltage ratio that records according to this curved line relation, obtain tested matrix conductivity.
Be the utility model embodiment as shown in Figure 8, peat and vermiculite proportioning are to concern curved surface between 1: 1 humidity mass water content, salt content and the conductivity of matrix.Adopting SPSS software that the data that experimental study obtains are carried out multiple linear regression, is dependent variable with the conductivity, and humidity and salt are divided into independent variable, set up mathematical model: y=0.318*x1+0.187*x2-0.061.Wherein, y is conductivity (ms/cm), and x1 is salinity (ms/cm), and x2 is the mass water content (%) of humidity.Soil humidity described in the utility model, conductivity in situ detection instrument be according to this curved surface relation, and the mass water content (%) of actual conductivity that records (ms/cm) and humidity is converted, and obtains tested matrix salinity (ms/cm).
Claims (3)
1. a soil humidity, conductivity in situ detection instrument, be made up of Integrated electrode sensor probe (1), sensor signal conditioning circuit (2), signal processing control unit (3), it is characterized in that: the probe (11) that Integrated electrode sensor probe (1) is 20mm by four spacings, probe (12), probe (13), probe (14) are formed; Integrated electrode sensor probe (1) and sensor signal conditioning circuit (2) insulation-encapsulated are in housing (4), and signal processing control unit (3) is encapsulated in the housing (5); Housing (4) is connected by one group of cable (6) with housing (5).
2. soil humidity according to claim 1, conductivity in situ detection instrument, it is characterized in that described Integrated electrode sensor probe (1) by the metal probe (111) that is arranged on Integrated electrode sensor probe (1) end, be sleeved on the metal coupling unit (113) on the metal probe (111) and the dead ring (112) that is sleeved on the metal coupling unit (113) is formed.
3. soil humidity according to claim 1, conductivity in situ detection instrument, it is characterized in that described sensor signal conditioning circuit (2) surveys conductivity excitation power supply circuit by power-switching circuit, signal extraction conversion and amplifying circuit, relay control four-end method and form, described signal processing control unit (3) is made up of single-chip microcomputer SPCE061A, LCD (7), 4 * 4 keyboards (8) and relay drive circuit; Power-switching circuit is converted to signal processing control unit (3) and signal extraction converter amplifier circuit power supply on the one hand with the 15V dry cell, be converted to the triangular wave alternating current of frequency 300Hz on the other hand, and, provide four-end method to survey the ac-excited power supply of the Integrated electrode sensor probe (1) of conductivity by relay control; Signal extracting circuit detects the triangle wave voltage signal U0 of precision resistance R and the triangle wave voltage signal U1 on detecting electrode (12) and (13) by integrated transporting discharging chip LM324, and has added bias voltage 1.24V at input end in the same way; Signaling conversion circuit becomes the real effective d. c. voltage signal by TRMS/DC converter chip AD736 with the triangle wave voltage conversion of signals that extracts at last, through entering the analog to digital converter of single-chip microcomputer SPCE061A behind the amplifying circuit; The single-chip microcomputer of signal processing control unit (3) is for carrying 10 analog-digital converter function modules and 32k flash memory SPCE061A single-chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202932883U CN201974399U (en) | 2010-08-16 | 2010-08-16 | Matrix humidity and conductivity in-situ detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202932883U CN201974399U (en) | 2010-08-16 | 2010-08-16 | Matrix humidity and conductivity in-situ detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072925A (en) * | 2010-08-16 | 2011-05-25 | 江苏大学 | Stroma moisture and conductivity in situ detector and method for determining salinity |
| CN102435645A (en) * | 2011-12-28 | 2012-05-02 | 江苏大学 | Measuring method for moisture content and conductivity of soilless culture substrate and sensor thereof |
| CN103837582A (en) * | 2014-03-14 | 2014-06-04 | 西北大学 | Micro-damage rammed earth salt measurement front-end structure for earthen archaeological site protection |
| CN111566477A (en) * | 2018-01-23 | 2020-08-21 | 丹尼斯·M·安德森 | Analysis of porous materials using laboratory calibrated test equipment and sample data |
| CN111751417A (en) * | 2019-03-28 | 2020-10-09 | 东亚Dkk株式会社 | Metering device |
-
2010
- 2010-08-16 CN CN2010202932883U patent/CN201974399U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072925A (en) * | 2010-08-16 | 2011-05-25 | 江苏大学 | Stroma moisture and conductivity in situ detector and method for determining salinity |
| CN102435645A (en) * | 2011-12-28 | 2012-05-02 | 江苏大学 | Measuring method for moisture content and conductivity of soilless culture substrate and sensor thereof |
| CN102435645B (en) * | 2011-12-28 | 2013-10-23 | 江苏大学 | Measuring method for moisture content and conductivity of soilless culture substrate and sensor thereof |
| CN103837582A (en) * | 2014-03-14 | 2014-06-04 | 西北大学 | Micro-damage rammed earth salt measurement front-end structure for earthen archaeological site protection |
| CN111566477A (en) * | 2018-01-23 | 2020-08-21 | 丹尼斯·M·安德森 | Analysis of porous materials using laboratory calibrated test equipment and sample data |
| CN111751417A (en) * | 2019-03-28 | 2020-10-09 | 东亚Dkk株式会社 | Metering device |
| CN111751417B (en) * | 2019-03-28 | 2023-03-03 | 东亚Dkk株式会社 | Metering device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20130816 |