CN103424437A - Method and device for detecting straw moisture through impedance method - Google Patents
Method and device for detecting straw moisture through impedance method Download PDFInfo
- Publication number
- CN103424437A CN103424437A CN2013103733480A CN201310373348A CN103424437A CN 103424437 A CN103424437 A CN 103424437A CN 2013103733480 A CN2013103733480 A CN 2013103733480A CN 201310373348 A CN201310373348 A CN 201310373348A CN 103424437 A CN103424437 A CN 103424437A
- Authority
- CN
- China
- Prior art keywords
- impedance
- circuit
- moisture
- signal
- processing module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to a method for detecting straw moisture through an impedance method, an alternating-current impedance method is used for measuring the straw moisture. A device for detecting the straw moisture comprises an alternating-current impedance signal detecting and processing module, a pressure signal detecting and processing module, a temperature sensor, an A/D switching circuit, a single chip microcomputer and an input output module. The alternating-current impedance signal detecting and processing module comprises a signal generating circuit, an impedance sensor and an impedance signal detecting and conditioning circuit, and the pressure signal detecting and processing module comprises a pressure sensor and a pressure signal conditioning circuit. The alternating-current impedance signal detecting and processing module and the pressure signal detecting and processing module are respectively connected with the A/D switching circuit, and the temperature sensor and the A/D switching circuit are respectively connected with the single chip microcomputer. The input output module comprises a liquid crystal display circuit, a communication circuit and a keyboard input circuit, and the liquid crystal display circuit, the communication circuit and the keyboard input circuit are respectively connected with the single chip microcomputer. The device can achieve real-time detection of the moisture contents of straws of various crops, compensate influence of temperature and bulk density and improve detection accuracy.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of impedance method moisture detector for straw.
Background technology
Water percentage has important effect in the fundamental research of stalk and processing and utilization.Traditional stalk determination of moisture method mainly adopts oven drying method, and the method measurement result is stable, precision is high, is to measure moisture standard method commonly used, but limits to some extent in the occasion that needs Quick Measurement stalk moisture.And existing stalk water content detection instrument on market mainly be take external import as main, compare similar grain measurement of moisture content instrument, price is higher.So, develop cheap, can be quick and precisely, the Portable straw moisture detector that is suitable for in-site measurement is necessary.
The moisture detecting method of agricultural material can be divided into direct method and the large class of indirect method two.Directly ratio juris is by physical dryness or chemical method, directly removes the moisture in agricultural material, by calculating, obtains the water cut value in sample.This class methods accuracy of detection is high, but the test duration is long, and testing cost is high, is suitable for using in laboratory and scientific research.Mainly comprise: electric dry oven method, hypobaric drying method, infra-red drying method and the way of distillation etc.Indirect method is mainly by measuring physical quantity relevant with moisture in agricultural material (such as the conductivity of material, specific inductive capacity etc.), obtains the moisture value of agricultural material through conversion.This class methods response is fast, but needs to solve the problems such as temperature is floated greatly, long-time stability are poor.Mainly comprise: capacitance method, electric-resistivity method, microwave method and infra-red method etc.Wherein, again so that with capacitance method and electric-resistivity method, agricultural material to be carried out to the moisture fast detecting the most extensive.
Resistance moisture measurement method is to utilize moisture difference in material, and the principle that its conductance is different is measured the method for moisture.Generally speaking, the resistance characteristic of agricultural material is: in certain water percentage scope, the logarithm of resistance and water cut are approximate linear; Secondly, in certain water percentage scope, the change in resistance of resistance is very large, and according to the difference of moisture, the resistance of resistance may be from lower mega-ohms until tens higher mega-ohms; Again, temperature is very remarkable on the impact of resistance, shows as in nature tested equivalent resistance and reduces with the rising of temperature.
Traditional electric-resistivity method is the most frequently used moisture measuring method because of the characteristics that it is measured fast, accurate, cost is low always, but has the defects such as signal intensity is little, sampling requirement is high, anti-interference is poor.The innovative approach based on the resistance measurement principle occurred in recent years, mainly contained: two range DC resistance methods, pulse resistance method, Research of Complex Impedance Separation Method and AC impedence method etc.While utilizing electric-resistivity method to carry out water content detection to agricultural material, resistance value not only is subject to the impact of water percentage, also can be subject to the impact of temperature and the volume density (being the compactness of sample) of sample.Therefore, when utilizing electric-resistivity method to carry out water content detection to agricultural material, need to consider these influence factors, thereby improve the precision detected.At present, existing agricultural material water percentage detecting instrument is multiplex in agricultural materials such as grain, tobacco and herbages, special less for the instrument and equipment of stalk water content detection, and does not consider the impact on measurement result of the temperature of sample and volume density.
Summary of the invention
For the problems and shortcomings that exist in existing agricultural crop straw water percentage detection technique, the objective of the invention is to be to provide a kind of impedance method stalk moisture detecting method, the method has overcome the defect that traditional DC resistance method measure signal intensity is little, error is large, thereby can realize the fast detecting of agricultural material moisture.
Realize that foregoing invention purpose technical scheme is to utilize the moisture of the method detection agricultural crop straw of high-frequency ac impedance, and measurement result is carried out to compactness and temperature real-Time Compensation, by measuring AC impedance value, temperature and the volume density of stalk, set up the mathematical model between AC impedance value, temperature and the volume density of stalk moisture and stalk, realize moisture content of straws fast, accurately detect.
The high-frequency ac impedance method is after tested agricultural material applies suitable simple alternating current pumping signal, and agricultural material can present conduction bathtub effect, has the sensitive bands about moisture.In this sensitive bands, the AC impedance value of agricultural material can produce because of the variation of moisture obvious variation.The high-frequency ac impedance method has overcome the defect that traditional DC resistance method measure signal intensity is little, error is large, thereby can realize the fast detecting of agricultural material moisture; On the other hand, when the resistance characteristic that utilizes agricultural material carries out water content detection, its resistance characteristic not only is subject to the impact of water percentage, also can be subject to the impact of temperature and the volume density (being compactness) of tested material, detect respectively the pressure and temperature of agricultural material in the present invention by pressure transducer and temperature sensor, measurement result is carried out to the pressure and temperature real-Time Compensation, can improve the precision of detection.The invention is characterized in, utilize the method for high-frequency ac impedance to detect the moisture of agricultural material, particularly agricultural crop straw, and measurement result is carried out to the pressure and temperature real-Time Compensation.The mathematical model of the AC impedance value of utilizing moisture content of straws and impedance transducer to measure and Correlative Influence Factors (temperature and volume density) realizes that moisture content of straws is quick, accurately detects.
A further object of the invention is to provide the pick-up unit of above-mentioned impedance method stalk moisture detecting method, comprises an AC impedance input and processing module, pressure signal detection and processing module, a temperature sensor, an A/D change-over circuit, a single-chip microcomputer and connected input/output module;
Described AC impedance input and processing module comprise that signal generating circuit, impedance transducer and impedance signal detect and modulate circuit;
Described pressure signal detects and processing module comprises pressure transducer and pressure signal conditioning circuit;
Described input/output module comprises liquid crystal display circuit, telecommunication circuit and keyboard input circuit;
Signal generating circuit is by the decay after impedance transducer and tested material coupling of simple alternating current pumping signal, obtain the voltage detection signal be directly proportional to the tested material moisture, veer away after large circuit, rectifying and wave-filtering, become the d. c. voltage signal be directly proportional to the tested material moisture; Pressure signal detection and processing module are for the signal of reception and processing pressure sensor, output dc voltage;
Described A/D change-over circuit converts the d. c. voltage signal of impedance signal detection and modulate circuit and the output of pressure signal conditioning circuit to digital data transmission to single-chip microcomputer, and the temperature signal that single-chip microcomputer transmits the digital signal that receives and temperature sensor is transferred to liquid crystal display circuit after treatment.
Described impedance transducer, pressure transducer and temperature sensor are assembled in the moisture measurement probe; Described signal generating circuit, impedance signal detection and modulate circuit, pressure signal conditioning circuit, A/D change-over circuit, single-chip microcomputer and input/output module are assemblied in the portable apparatus box; The moisture measurement probe is connected by connection cable with the portable apparatus box.Described moisture measurement probe comprises impedance transducer, temperature sensor, pressure transducer, bracing frame, handle; Have a jack on the bracing frame of moisture measurement probe, be respectively used to blocked impedance sensor, pressure transducer and temperature sensor; Bracing frame and taper knob are fitted together, and the connection cable that connects impedance transducer, temperature sensor, pressure transducer passes from the center pit of bracing frame and handle, and the other end is connected with the portable apparatus box.Be furnished with LCDs, ON/OFF key, stalk kind options button, measurement of water ratio key, data upload/preservation key, printing key and using method brief introduction key on the portable apparatus box.
Impedance transducer of the present invention adopts the double probe-type stainless steel electrode.
Pressure transducer of the present invention adopts the resistance-type diaphragm pressure sensor.
Temperature sensor of the present invention adopts digital temperature sensor.
Pressure signal of the present invention detects and processing module comprises pressure transducer and pressure signal conditioning circuit, for the signal of reception and processing pressure sensor, output dc voltage.Pressure signal detection and processing module connect the A/D change-over circuit and export single-chip microcomputer to, process the volume density value that converts straw sample to through single-chip microcomputer.
Temperature sensor of the present invention, for measuring temperature signal, directly be connected with single-chip microcomputer.
Liquid crystal display circuit of the present invention adopts Chinese character image type or Character Mode LCD, for showing AC impedance value, force value, temperature value and the moisture value of tested straw sample.
Telecommunication circuit of the present invention adopts serial communication circuit to realize.
Keyboard input circuit of the present invention comprises ON/OFF key, stalk kind options button, measurement of water ratio key, data upload/preservation key, printing key and using method brief introduction key.
Measuring principle of the present invention is to adopt the high-frequency ac impedance method to measure material moisture.The moisture measurement experimental study that agricultural material is carried out is found, under the AC field excitation of appropriate frequency, most of agricultural materials present conduction bathtub effect, there is the sensitive bands about moisture, apply the simple alternating current pumping signal of this moisture-sensitive frequency band, agricultural material changes greatly because of different its AC impedance values of moisture, can realize the fast detecting of agricultural material moisture.The simple alternating current pumping signal that signal generating circuit produces decay after impedance transducer and tested material coupling, obtain the voltage detection signal be directly proportional to the tested material moisture, veer away after large circuit, rectifying and wave-filtering, become the d. c. voltage signal be directly proportional to the tested material moisture.Then in conjunction with influence factor, be temperature and volume density, according to the mathematical model between the AC impedance value of the different moisture content of straws of setting up and impedance transducer and influence factor temperature, volume density, calculate the water percentage that indirectly obtains tested straw sample by program.
Volume density in influence factor depends on kind, water percentage and the compactness of stalk, in order to quantize the impact of stalk compactness on the AC impedance value, reflects the compactness of material in modeling with volume density.Adopts pressure sensor is measured, and with the volume density of material, indirectly reflects compactness.It is larger that moisture content of straws also is subject to the impact of stalk kind, is provided with stalk kind options button in the present invention.
Compared with prior art, the invention has the advantages that:
1. adopt the high-frequency ac impedance method to measure moisture content of straws, and pressure and temperature is compensated, can obtain higher measuring accuracy;
2. this impedance method moisture detector for straw provides a kind of portable set that is exclusively used in the stalk moisture measurement, for the water percentage of stalk in the industrial and agricultural production application measured and provided convenience in real time;
3. this impedance method moisture detector for straw, measuring object is the multiple kinds of crops stalk, display measurement data in real time in measuring process;
4. this impedance method moisture detector for straw, considered influence factor (temperature, volume density and stalk kind), improved accuracy of detection;
5. this impedance method moisture content detection device is simple in structure, with low cost, is easy to realize.
The accompanying drawing explanation
Fig. 1 is the structured flowchart of pick-up unit of the present invention;
Fig. 2 is the signal generating circuit figure of pick-up unit of the present invention;
Fig. 3 is that the impedance signal of pick-up unit of the present invention detects and modulate circuit figure;
Fig. 4 is the pressure signal detection of pick-up unit of the present invention and the circuit diagram of processing module;
Fig. 5 is the circuit diagram of the temperature sensor of pick-up unit of the present invention;
Fig. 6 is the circuit diagram of the A/D change-over circuit of pick-up unit of the present invention;
Fig. 7 is the circuit diagram of the single-chip microcomputer of pick-up unit of the present invention;
Fig. 8 is the circuit diagram of the liquid crystal display circuit of pick-up unit of the present invention;
Fig. 9 is the circuit diagram of the telecommunication circuit of pick-up unit of the present invention;
Figure 10 is the circuit diagram of the keyboard input circuit of pick-up unit of the present invention;
Figure 11 is the structural representation of the moisture measurement probe of pick-up unit of the present invention;
Figure 12 is the bracing frame of moisture measurement probe of pick-up unit of the present invention and the assembling schematic diagram of handle;
Figure 13 is the structural representation of the portable apparatus box of pick-up unit of the present invention;
Figure 14 is the comparison diagram that wheat stalk is measured water percentage and actual water percentage.
Embodiment
Below by the inventor, provide specifically close embodiment and accompanying drawing is described in detail the present invention, further illustrate purpose of the present invention and characteristics.
Embodiment 1A kind of impedance method stalk moisture detecting method
The present embodiment utilizes the correlativity of moisture content of straws pair and AC impedance, and considers the impact on test result of temperature, volume density and stalk kind, by modeling, realizes that moisture content of straws fast, accurately detect.
Test material is wheat " the western agriculture 979 " stalk after Yang Ling Area during Summer results.Will be without the branch bar that rots, is cut into without the wheat stalk of insect pest long 30 ± 3mm, as test specimen.The initial wet basis water percentage of sample is 10.4%.Take a certain amount of straw sample and be placed in polybag, prepare the sample of different wet basis water percentage by the mode of repeatedly adding on a small quantity deionized water in stalk, the sample double-layer seal is placed on to 2-4 days in the reefer of 2 ℃, so that moisture is slowly absorbed by straw sample and is evenly distributed.Before test, the actual water percentage that adopts oven drying method to measure sample is respectively 10.4%, 12.5%, 15.2%, 17.6% and 19.6%.Sample under each water percentage is divided into to 3 parts, to obtain 3 different volume densities.
During measurement, sample is poured in dry beaker, pack into the quality of straw sample in beaker of record, according to the volume density of the volume calculation sample of stalk quality and beaker.Then, with preservative film, seal vessel port, put into reefer.When sample temperature is cooled to 2 ℃ of left and right, take out sample, be placed in thermostatic drying chamber rapidly, and the water percentage detecting electrode that will open minute vertically, fully inserts in sample, assurance electrode, pressure transducer contact with sample fully with temperature sensor.Resistance value and the temperature value of sample while measuring and recording 5 ~ 40 ℃ (5 ℃ is gradient).At each water percentage and each temperature, repeat 3 times, the mean value of measuring for 3 times is as measurement result.
In formula, be impedance, k Ω; For water percentage, %, 10.4≤W≤19.7%; ρ is volume density, kg/m3; For temperature value, ℃, 5≤T≤40.
Regression model and each factor of influence to above formula carry out variance and significance analysis, and this regression model of presentation of results is remarkable on 0.001 level.Under same experimental conditions, pass through model testing, presentation of results, be 10.0% ~ 20.0% at the wet basis water percentage, volume density is that in 75.3 ~ 101.3kg/m3, the temperature scope that is 5 ~ 40 ℃, this detector is-2.0% ~ 0.9% to the error of absolute method of measurement of water percentage, detect the response time to be less than 3s.Result as shown in figure 14.
Embodiment 2A kind of impedance method moisture detector for straw
As shown in Figure 1, a kind of impedance method moisture detector for straw, comprise that AC impedance input and processing module 1, pressure signal detect and processing module 2, temperature sensor 3, A/D change-over circuit 4, single-chip microcomputer 5 and input/output module 6; Described AC impedance input and processing module 1 comprise that signal generating circuit 7, impedance transducer 8 and impedance signal detect and modulate circuit 9; Described AC impedance input and processing module 1 are connected with A/D change-over circuit 4; Described pressure signal detects and processing module 2 comprises pressure transducer 10 and pressure signal conditioning circuit 11; Described pressure signal detects and processing module 2 is connected with A/D change-over circuit 4; Described temperature sensor 3 directly is connected with single-chip microcomputer 5; Described A/D change-over circuit 4 is connected with single-chip microcomputer 5; Described input/output module 6 comprises liquid crystal display circuit 12, telecommunication circuit 13 and keyboard input circuit 14, with single-chip microcomputer 5, is connected respectively.
Signal generating circuit 7 is by the decay after impedance transducer and tested material coupling of simple alternating current pumping signal, obtain the voltage detection signal be directly proportional to the tested material moisture, veer away after large circuit, rectifying and wave-filtering, become the d. c. voltage signal be directly proportional to the tested material moisture; Pressure signal detection and processing module 2 are for the signal of reception and processing pressure sensor, output dc voltage.
A/D change-over circuit 4 detects impedance signal and the d. c. voltage signal of modulate circuit 9 and 11 outputs of pressure signal conditioning circuit converts digital data transmission to single-chip microcomputer 5, and the temperature signal that single-chip microcomputer 5 transmits the digital signal that receives and temperature sensor 3 is transferred to liquid crystal display circuit 12 after treatment.
Described A/D change-over circuit 4 detects impedance signal and the d. c. voltage signal of modulate circuit 9 and 11 outputs of pressure signal conditioning circuit converts digital data transmission to single-chip microcomputer 5, and the temperature signal that single-chip microcomputer 5 transmits the digital signal that receives and temperature sensor 3 flows to liquid crystal display circuit 12 after treatment.
As shown in Figures 2 and 3, AC impedance input of the present invention and processing module 1 are connected and are formed by the A point of circuit diagram in two figure of Fig. 2 and Fig. 3.Adopt the self-balancing bridge circuit testing circuit, comprise signal generating circuit 7, impedance transducer 8 and impedance signal modulate circuit 9.
Described signal generating circuit 7, be comprised of aggregation function signal generator ICL8038 and one-level follower.The amplitude of sinusoidal excitation signal Ui (t) is by the decision of power supply amplitude, and timing capacitor C2, resistance R 3 and potentiometer RV3 determine the frequency range of sinusoidal excitation signal jointly, and potentiometer RV1 and RV2 are used for regulating the degree of distortion of sinusoidal excitation signal positive-negative half-cycle.The one-level follower is by operational amplifier A D8032(A) form.This one-level follower is for improving the load-carrying ability of subsequent conditioning circuit, output amplitude, the definite sinusoidal excitation signal Ui (t) of frequency.
Described impedance transducer 8 adopts the double probe-type stainless steel electrode, for the AC impedance of stalk material between potential electrode.
Described impedance signal modulate circuit 9 is comprised of current-voltage conversion circuit, range switch circuit and AC-DC change-over circuit.Sinusoidal excitation signal Ui (t) is via feedback resistance R7, R8, R9, R10, R11 and operational amplifier A D8032(B) ac amplifier circuit that forms converts tested AC impedance Zx to the alternating voltage Uo (t) proportional with water percentage.
Described range switch circuit, be comprised of digital control analog switch CD4051B and feedback resistance R7, R8, R9, R10, R11.
Described AC-DC change-over circuit, adopt the integrated conversion chip AD637 of RMS/DC, the AC signal Uo (t) after amplifying via AD8032 is carried out to the AC-DC conversion, last output dc voltage Uz, Uz delivers to single-chip microcomputer 5 and processes after A/D change-over circuit 4, converts the AC impedance value to.
As shown in Figure 4, in pressure signal detection of the present invention and processing module 2, pressure transducer 10 adopts the resistance-type thin-film pressure sensors.The power pins P2 of pressure transducer 10 is connected to direct supply, and signal pins P1 is connected to pressure signal conditioning circuit 11, and pressure signal conditioning circuit 11 is comprised of operational amplifier NE5532 and potentiometer RV5.Potentiometer RV5 realizes the amplification to pressure transducer 10 output signals, last output dc voltage Up.Pressure signal detection and processing module 2 connect A/D change-over circuit 4 and export single-chip microcomputer 5 to, through single-chip microcomputer 5, process the volume density value that converts straw sample to.
As shown in Figure 5, temperature sensor 3 of the present invention, adopt the digital temperature sensor DS18B20 detected temperatures, and directly be connected with single-chip microcomputer 5.
As shown in Figure 6, A/D change-over circuit 4 of the present invention, adopt A/D converter TLC1543, and its data input channel AIN0 and AIN1 receive respectively analog voltage signal Uz and Up.
As shown in Figure 7, single-chip microcomputer 5 of the present invention, adopt the AT89S52 single-chip microcomputer, and resistance R 12, capacitor C 14 and button S1 form the button reset circuit of single-chip microcomputer, and capacitor C 12, C13 and crystal oscillator Y1 form the clock circuit of single-chip microcomputer.
As shown in Figure 8, liquid crystal display circuit 12 of the present invention, adopt liquid crystal display LCD12864, its control port RS, RW, E and PSB is connected with port P2.7, P2.6, P2.5 and the P2.4 of single-chip microcomputer 5 respectively, its FPDP D0 ~ D7 is connected with the port P0.0 ~ P0.7 of single-chip microcomputer 5 respectively, the AC impedance value, force value, temperature value and the water cut value that in order to demonstration, detect.
As shown in Figure 9, telecommunication circuit 13 of the present invention, be comprised of the RS232 serial communication circuit, with single-chip microcomputer 5, is connected, and the T2IN of its chips MAX232 and R2OUT mouth connect respectively TXD and the RXD port of single-chip microcomputer 5.Telecommunication circuit 13 realizes uploading and preserving of measurement data.
As shown in figure 10, keyboard input circuit 14 of the present invention, formed by determinant keyboard, be connected with single-chip microcomputer 5, comprise ON/OFF key 25, stalk kind options button 26, measurement of water ratio key 27, data upload/preservation key 28, printing key 29 and using method brief introduction key 30.
As shown in figure 11, moisture measurement probe 15 of the present invention, comprise impedance transducer 8, bracing frame 18 and handle 19.Wherein impedance transducer 8, pressure transducer 10 and temperature sensor 3 all are fixed in the jack on bracing frame 18.
As shown in figure 12, have 4 jacks on bracing frame 18 of the present invention, two impedance transducer jacks 21 are for blocked impedance sensor 8, and pressure transducer jack 22 is for fixation pressure sensor 10, and temperature sensor jack 23 is for fixed temperature sensor 3.Bracing frame 18 is connected with the mode of handle 19 by buckle.
As shown in figure 13, portable apparatus box 16 of the present invention, except impedance transducer 8 and be fixed in the pressure transducer 10 and temperature sensor 3 in bracing frame 18 jacks, remainder all is installed in portable instrument case 16.
A kind of impedance method moisture detector for straw of the present invention, measuring process and process are as follows: at first, switch on power and press ON/OFF key 25, making device in state to be measured; Then, impedance transducer 8, pressure transducer 10 and the temperature sensor 3 of moisture measurement probe 15 are inserted in tested straw sample fully, press successively stalk kind options button 26 and measurement of water ratio key 27, make device in measuring state.Because making the AC impedance value of material around impedance transducer 8, the straw sample of putting into changes, after AC impedance detection and processing module 1 detect this variation, volume density value and the temperature value of the straw sample detected in conjunction with pressure detection and processing module 2 and temperature sensor 3, through the A/D change-over circuit, converted to the water cut value of straw sample by single-chip microcomputer 5, and can read from liquid crystal display the water cut value of straw sample; Finally, can press as required data upload/preservation key 28, by the data upload that detects and store in PC.The user can also press as required using method brief introduction key 30 and understand the using method brief introduction of this device and the operating process of measurement, and can data-printing be exported by printing key 29.
Claims (5)
1. an impedance method stalk moisture detecting method, it is characterized in that, utilize the moisture of the method detection agricultural crop straw of high-frequency ac impedance, and measurement result is carried out to compactness and temperature real-Time Compensation, by measuring AC impedance value, temperature and the volume density of stalk, set up the mathematical model between AC impedance value, temperature and the volume density of stalk moisture and stalk, realize moisture content of straws fast, accurately detect.
2. an impedance method moisture detector for straw comprises:
A temperature sensor (3), an A/D change-over circuit (4), a single-chip microcomputer (5) and connected input/output module (6);
It is characterized in that, also comprise that AC impedance input and processing module (1) and pressure signal detect and processing module (2); Described AC impedance input and processing module (1) comprise that signal generating circuit (7), impedance transducer (8) and impedance signal detect and modulate circuit (9);
Described pressure signal detects and processing module (2) comprises pressure transducer (10) and pressure signal conditioning circuit (11);
Described input/output module (6) comprises liquid crystal display circuit (12), telecommunication circuit (13) and keyboard input circuit (14);
Signal generating circuit (7) is by the decay after impedance transducer and tested material coupling of simple alternating current pumping signal, obtain the voltage detection signal be directly proportional to the tested material moisture, veer away after large circuit, rectifying and wave-filtering, become the d. c. voltage signal be directly proportional to the tested material moisture; Pressure signal detection and processing module (2) are for the signal of reception and processing pressure sensor, output dc voltage;
Described A/D change-over circuit (4) detects impedance signal and the d. c. voltage signal of modulate circuit (9) and pressure signal conditioning circuit (11) output converts digital data transmission to single-chip microcomputer (5), and single-chip microcomputer (5) is transferred to liquid crystal display circuit (12) after treatment by the digital signal that receives and the temperature signal of temperature sensor (3) transmission.
3. a kind of impedance method moisture detector for straw according to claim 2, is characterized in that, described impedance transducer (8), pressure transducer (10) and temperature sensor (3) are assembled in moisture measurement probe (15); Described signal generating circuit (7), impedance signal detect and modulate circuit (9), pressure signal conditioning circuit (11), A/D change-over circuit (4), single-chip microcomputer (5) and input/output module (6) are assemblied in portable apparatus box (16); Moisture measurement probe (15) is connected by connection cable (20) with portable apparatus box (16).
4. a kind of impedance method moisture detector for straw according to claim 2, it is characterized in that, be furnished with LCDs (24), ON/OFF key (25), stalk kind options button (26), measurement of water ratio key (27), data upload/preservation key (28), printing key (29) and using method brief introduction key (30) on described portable apparatus box (16).
5. a kind of impedance method moisture detector for straw according to claim 2, is characterized in that, described impedance transducer (8) adopts the double probe-type stainless steel electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103733480A CN103424437A (en) | 2013-08-24 | 2013-08-24 | Method and device for detecting straw moisture through impedance method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103733480A CN103424437A (en) | 2013-08-24 | 2013-08-24 | Method and device for detecting straw moisture through impedance method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103424437A true CN103424437A (en) | 2013-12-04 |
Family
ID=49649505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103733480A Pending CN103424437A (en) | 2013-08-24 | 2013-08-24 | Method and device for detecting straw moisture through impedance method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103424437A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713021A (en) * | 2014-01-06 | 2014-04-09 | 长春汽车工业高等专科学校 | Detecting method and device with impedance type water content sensor |
| CN106770480A (en) * | 2016-12-13 | 2017-05-31 | 武汉凯特复兴科技有限责任公司 | A kind of buried type grain moisture content instrument |
| CN110568134A (en) * | 2019-09-09 | 2019-12-13 | 深圳冠亚水分仪科技有限公司 | Moisture meter sensor and working method |
| CN113804573A (en) * | 2021-11-19 | 2021-12-17 | 中国农业科学院农业环境与可持续发展研究所 | Detection method for straw bundle burning quality |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001249098A (en) * | 2000-03-03 | 2001-09-14 | Kett Electric Laboratory | Single grain moisture meter and ground grain judging method using the same |
| CN1773270A (en) * | 2005-09-30 | 2006-05-17 | 湖南文理学院 | Method for measuring textile fiber moisture |
| CN2847282Y (en) * | 2005-09-30 | 2006-12-13 | 湖南文理学院 | Novel textile fiber water content detector |
| CN102393408A (en) * | 2011-11-03 | 2012-03-28 | 西北农林科技大学 | Capacitive detector for moisture content of straw |
| WO2012137745A1 (en) * | 2011-04-07 | 2012-10-11 | 三菱電機株式会社 | Moisture content detection device |
-
2013
- 2013-08-24 CN CN2013103733480A patent/CN103424437A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001249098A (en) * | 2000-03-03 | 2001-09-14 | Kett Electric Laboratory | Single grain moisture meter and ground grain judging method using the same |
| CN1773270A (en) * | 2005-09-30 | 2006-05-17 | 湖南文理学院 | Method for measuring textile fiber moisture |
| CN2847282Y (en) * | 2005-09-30 | 2006-12-13 | 湖南文理学院 | Novel textile fiber water content detector |
| WO2012137745A1 (en) * | 2011-04-07 | 2012-10-11 | 三菱電機株式会社 | Moisture content detection device |
| CN102393408A (en) * | 2011-11-03 | 2012-03-28 | 西北农林科技大学 | Capacitive detector for moisture content of straw |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713021A (en) * | 2014-01-06 | 2014-04-09 | 长春汽车工业高等专科学校 | Detecting method and device with impedance type water content sensor |
| CN103713021B (en) * | 2014-01-06 | 2016-02-03 | 长春汽车工业高等专科学校 | Impedance type moisture sensor detection method and pick-up unit |
| CN106770480A (en) * | 2016-12-13 | 2017-05-31 | 武汉凯特复兴科技有限责任公司 | A kind of buried type grain moisture content instrument |
| CN106770480B (en) * | 2016-12-13 | 2019-06-28 | 武汉三环新创科技有限公司 | A kind of buried type grain moisture content instrument |
| CN110568134A (en) * | 2019-09-09 | 2019-12-13 | 深圳冠亚水分仪科技有限公司 | Moisture meter sensor and working method |
| CN113804573A (en) * | 2021-11-19 | 2021-12-17 | 中国农业科学院农业环境与可持续发展研究所 | Detection method for straw bundle burning quality |
| CN113804573B (en) * | 2021-11-19 | 2022-02-11 | 中国农业科学院农业环境与可持续发展研究所 | Detection method for straw bundle burning quality |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106047678B (en) | A kind of cytoactive detection method and apparatus based on Measured By Impedance Spectroscopy | |
| CN102393408A (en) | Capacitive detector for moisture content of straw | |
| CN203849198U (en) | Detection device for moisture content of plant leaves | |
| CN103424437A (en) | Method and device for detecting straw moisture through impedance method | |
| CN202204797U (en) | Blood sugar detection instrument | |
| CN203519533U (en) | Impedance-method straw moisture detection device | |
| CN102331446A (en) | On-line grain moisture measuring device | |
| CN207832218U (en) | A kind of sensor performance test device | |
| Gao et al. | Comparison of voltammetry and digital bridge methods for electrical resistance measurements in wood | |
| CN205262894U (en) | Appearance is oozed to small -size evaporating | |
| CN200959007Y (en) | Water-content determiner | |
| CN106093117A (en) | A kind of fresh meat moisture content detection device and method | |
| CN203396740U (en) | Double-temperature single-rod insertion type tobacco leaf moisture meter | |
| CN104374807A (en) | Salinity detection method and salinity meter thereof | |
| CN107064241A (en) | Device available for accurate detection moisture | |
| CN108871996B (en) | Method for measuring soil mass water content and soil volume weight on site | |
| CN203117280U (en) | STM 32-based intelligent four-probe meter | |
| CN203241371U (en) | Portable multi-index impedance biosensor device | |
| CN201653961U (en) | On-line quick detection instrument for perfuming uniformity of tobacco shreds | |
| CN103107788B (en) | A kind of two lock-in amplifiers for water quality monitoring equipment and signal processing method and water quality monitoring equipment | |
| CN208125662U (en) | A kind of fruits and vegetables heated-air drying moisture content on-line measurement device | |
| CN202305462U (en) | Device for online measurement of grain moisture | |
| EP3001193A1 (en) | System for characterisation of pure and ultrapure water | |
| CN103175870A (en) | Fast detection device for waste cooking oil and detection method of device | |
| CN215985837U (en) | Compressed tea water content measuring instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131204 |