CN107014875A - A kind of amendment type moisture detector - Google Patents
A kind of amendment type moisture detector Download PDFInfo
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- CN107014875A CN107014875A CN201710231968.9A CN201710231968A CN107014875A CN 107014875 A CN107014875 A CN 107014875A CN 201710231968 A CN201710231968 A CN 201710231968A CN 107014875 A CN107014875 A CN 107014875A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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Abstract
The invention discloses a kind of amendment type moisture detector, including moisture detector, convert of capacitor to voltage device, analog-digital converter, central processing unit, digital analog converter and the display being sequentially connected；Also include temperature sensor and keyboard, the temperature sensor is connected with digital analog converter, and keyboard is connected with central processing unit；The moisture detector is capacitance type sensor.The present invention is by using temperature sensor and central processing unit, and the keyboard and display being connected with central processing unit, the on-line real-time measuremen of grain moisture content can be not only completed, the linear and temperature adjustmemt of grain moisture content can also be completed by keyboard, so that testing result is more accurate.
Description
Technical field
The present invention relates to a kind of detection means, and in particular to a kind of amendment type moisture detector.
Background technology
With the development of science and technology and growth in the living standard, people are to things such as grain, seed, medicine, chemical industry, food
The demand of material is more and more.Moisture directly affects safe storage and the trade deciding grade and level of these materials, therefore, storage, trade
During moisture check it is particularly significant.Grain drying is the important step of grain security storage, and it is a continuous production
Process, its flow is：Raw grain food is sent into drying tower after treatment first, then by preheating, dry, tempering, is cooled to
Normal temperature, reaches 14% of safe moisture or so discharge drying tower, in the process, and the moisture on-line detection of grain is restriction grain
The core technology of drying system.
For a long time, the moisture of article generally relies on hand rubbing mouth and stung and judges by rule of thumb, and error is very big, extremely unreliable,
Cause a large amount of grains, seed, medicinal material and other items to be gone rotten in storage and transportation rotten, cause huge loss.Traditional water
Point detection method is divided into direct method and indirect method, and measuring principle includes resistance-type, condenser type, microwave type, middle minor, weight method
Deng.In these existing methods, the measurement accuracy of off-line type is higher, it is adaptable to laboratory measurement.For current moisture measurement side
The concrete condition of method and drying equipment, traditional moisture measuring method can not complete the on-line real-time measuremen, linear of grain moisture content
With the amendment of temperature, it cannot also realize control in real time and alarm.
The content of the invention
The technical problems to be solved by the invention are to overcome the deficiencies in the prior art, it is therefore intended that provide a kind of amendment type water
Sorting-detecting instrument, it is by using temperature sensor and central processing unit, and the keyboard and display being connected with central processing unit,
The on-line real-time measuremen of grain moisture content can be not only completed, the linear and temperature that can also complete grain moisture content by keyboard is repaiied
Just, so that testing result is more accurate.
The present invention is achieved through the following technical solutions：
A kind of amendment type moisture detector, including be sequentially connected moisture detector, convert of capacitor to voltage device, analog-to-digital conversion
Device, central processing unit, digital analog converter and display；Also include temperature sensor and keyboard, the temperature sensor and digital-to-analogue
Converter is connected, and keyboard is connected with central processing unit；The moisture detector is capacitance type sensor；The moisture detector：
For detecting moisture signal and transmitting a signal to convert of capacitor to voltage device；The convert of capacitor to voltage device：For receiving moisture
The signal of detector transmission and processing, then send the signal after processing to analog-digital converter；The temperature sensor：For
Detection temperature signal simultaneously transmits a signal to analog-digital converter；The analog-digital converter：For receive convert of capacitor to voltage device and
The signal of temperature sensor transmission and processing, then send the signal after processing to central processing unit；The keyboard：For supplying
User inputs control signal and sends control signal to central processing unit；The central processing unit：For receiving analog-to-digital conversion
Device and the signal of keyboard transmission and processing, then send the signal after processing to digital analog converter；The digital analog converter：With
The signal transmitted in central processing unit and processing, then send the signal after processing to display；The display：For connecing
Receive signal and the display of digital analog converter transmission.In the present invention, moisture detector used is capacitance type sensor, measures grain
Grain to be measured is put between capacitance sensor two-plate during moisture, because the water content of grain is different, so that capacitance sensing
The relative dielectric constant of device changes, so as to cause the change of capacitance, during using the present invention, on the one hand, by water content detection
The moisture of device on-line checking grain, and the moisture signal detected is sent to pass to electricity after extraction in the form of electric capacity
Hold electric pressure converter, capacitance signal is converted into after voltage signal sending analog-digital converter to by convert of capacitor to voltage device, converted,
Central processing unit is finally sent into the form of data signal, central processing unit turns by digital-to-analogue again after being acted upon to data signal
Parallel operation processing output, the moisture value most measured at last is shown over the display；On the other hand, because grain moisture content can be by environment
The influence of temperature, the present invention detects environment temperature using temperature sensor, and user can pass through key according to the temperature value detected
Revised parameter value is inputted central processing unit by disk operation to correct corresponding parameter value, so as to realize to being tested grain
The accurate measurement of moisture.
Further, in addition to signal generator, the signal generator is connected with moisture detector, for producing excitation
Signal simultaneously sends moisture detector to, and the moisture detector is additionally operable to receive the signal of signal generator transmission and passes signal
Give convert of capacitor to voltage device.To make measurement result more accurate, the present invention applies a sine in one end of capacitance sensor
High-frequency excitation signal, then will produce a convergent response in the other end of capacitance sensor, moreover, the excitation and generation that apply
Response be same frequency, simply phase is translated, so as to obtain more stable capacitance so that measurement result is more smart
Really.
Further, it is also associated with DC amplification circuit between convert of capacitor to voltage device and analog-digital converter.It is general next
Say, the moisture signal that capacitance sensor is detected is fainter, analog-to-digital conversion is sent directly into after being handled through convert of capacitor to voltage device
Device can produce larger error, by setting DC amplification circuit, can amplify small-signal so that measurement result is more accurate
Really.
Further, the DC amplification circuit includes the first triode, the second triode, the first power supply and the second electricity
The emitter stage of source, the first triode and the second triode is grounded, and the base stage of the first triode is used as the defeated of DC amplification circuit
Enter end, first resistor, the colelctor electrode of the first triode and the first electricity are connected between the base stage of the first triode and the first power supply
Second resistance is connected between source, 3rd resistor is connected between the colelctor electrode of the first triode and the base stage of the second triode,
The 5th resistance is connected between the base stage and second source of second triode, the colelctor electrode of the second triode is used as direct current amplification electricity
The 4th resistance is connected between the output end on road, and the colelctor electrode of the second triode and the first power supply.Second source is auxiliary electricity
Source, by choosing appropriate value to 3rd resistor and the 5th resistance, just can both meet the requirement of operating point, can be closed again
Suitable multiplication factor.
Further, in addition to alarm, the alarm is connected with central processing unit.During using the present invention, work as grain
Moisture measurement result is more than or less than a certain value then by alarm equipment alarm, reminds related personnel to take treatment measures, it is to avoid to make
Into unnecessary loss.
The present invention compared with prior art, has the following advantages and advantages：1st, the present invention is examined by using moisture
Device, temperature sensor and central processing unit, and the keyboard and display being connected with central processing unit are surveyed, grain can be not only completed
The on-line real-time measuremen of drinking water point, can also complete the linear and temperature adjustmemt of grain moisture content by keyboard, so that detection knot
Fruit is more accurate；2nd, by one end setting signal generator in capacitance type sensor, so that more stable capacitance is obtained,
So that measurement result is more accurate；3rd, by setting DC amplification circuit, small-signal can be amplified so that measurement result is more
Plus it is accurate；4th, it by setting alarm, can be more than in measuring grain moisture content result or less than a certain value alarm, remind related
Personnel take treatment measures, it is to avoid cause unnecessary loss..
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the structural representation of DC amplification circuit.
Mark and corresponding parts title in accompanying drawing：The triodes of VT1-first, the triodes of VT2-second, E1-the first
Power supply, E2-second source, R1-first resistor, R2-second resistance, R3-3rd resistor, the resistance of R4-the 4th, R5-the
Five resistance.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment
As shown in figure 1, the present embodiment provides a kind of amendment type moisture detector, including be sequentially connected signal generator,
Moisture detector, convert of capacitor to voltage device, DC amplification circuit, analog-digital converter, central processing unit, digital analog converter and display
Device；Also include temperature sensor, keyboard and alarm, temperature sensor is connected with digital analog converter, keyboard and alarm with
Central processing unit is connected；Moisture detector is capacitance type sensor；Moisture detector：For detecting moisture signal and passing signal
Give convert of capacitor to voltage device；Convert of capacitor to voltage device：Signal and processing for receiving moisture detector transmission, then will place
Signal DC amplification circuit after reason, DC amplification circuit sends analog-digital converter to after the signal received is amplified；
Temperature sensor：For detection temperature signal and transmit a signal to analog-digital converter；Analog-digital converter：Put for receiving direct current
The signal of big circuit and temperature sensor transmission and processing, then send the signal after processing to central processing unit；Keyboard：With
Control signal is inputted in confession user and sends control signal to central processing unit；Central processing unit：For receiving analog-to-digital conversion
Device and the signal of keyboard transmission and processing, then send the signal after processing to digital analog converter and alarm；Digital-to-analogue conversion
Device：The signal transmitted for central processing unit and processing, then send the signal after processing to display；Display：For
Receive signal and the display of digital analog converter transmission；Alarm：For receiving the signal of central processing unit transmission and according to the letter
Number send alarm or be failure to actuate.
As shown in Fig. 2 DC amplification circuit includes the first triode VT1, the second triode VT2, the first power supply E1 and the
Two power supply E2, the first triode VT1 and the second triode VT2 emitter stage is grounded, and the first triode VT1 base stage is as straight
The input of current amplifier, is connected with first resistor R1, the one or three between the first triode VT1 base stage and the first power supply E1
Second resistance R2, the first triode VT1 colelctor electrode and the two or three are connected between pole pipe VT1 colelctor electrode and the first power supply E1
Is connected between base stage and second source E2 that 3rd resistor R3, the second triode VT2 is connected between pole pipe VT2 base stage
Five resistance R5, the second triode VT2 colelctor electrode is used as the output end of DC amplification circuit, and the second triode VT2 current collection
The 4th resistance R4 is connected between pole and the first power supply E1.
Moisture detector used in the present embodiment is capacitance type sensor, and grain to be measured is put into electricity during measurement grain moisture content
Between appearance sensor two-plate, because the water content of grain is different, so that the relative dielectric constant of capacitance sensor becomes
Change, so as to cause the change of capacitance, in order to obtain, capacitance is relatively reliable, occurs in one end of capacitance sensor by signal
Device applies a sinusoidal high-frequency excitation signal, then a convergent response will be produced in the other end of capacitance sensor, moreover, applying
Plus excitation with produce response be same frequency, simply phase is translated, so as to obtain more stable capacitance.Implement
During the present embodiment, on the one hand, by the moisture of moisture detector on-line checking grain, and the moisture signal detected is transmitted
Convert of capacitor to voltage device is passed to after the form extraction for giving electric capacity, capacitance signal is converted into voltage by convert of capacitor to voltage device to be believed
Send analog-digital converter after number to, it is converted, central processing unit, central processing unit logarithm are finally sent into the form of data signal
Word signal handles output by digital analog converter again after being acted upon, and the moisture value most measured at last is shown over the display；Separately
On the one hand, because grain moisture content can be affected by the ambient temperature, the present embodiment detects environment temperature using temperature sensor, uses
Family can correct corresponding parameter value by keyboard operation according to the temperature value detected, and revised parameter value is defeated
Enter central processing unit, so as to realize the accurate measurement to being tested grain moisture content.
In the present embodiment, the model Tyke TSG4100A of signal generator, the model Omron of moisture detector
E2K-C25MF1, the model AD7741 of analog-digital converter, the model AT89C51 of central processing unit, the type of digital analog converter
Number be AD421.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (5)
1. a kind of amendment type moisture detector, it is characterised in that including moisture detector, the convert of capacitor to voltage being sequentially connected
Device, analog-digital converter, central processing unit, digital analog converter and display；Also include temperature sensor and keyboard, the temperature is passed
Sensor is connected with digital analog converter, and keyboard is connected with central processing unit；The moisture detector is capacitance type sensor；
The moisture detector：For detecting moisture signal and transmitting a signal to convert of capacitor to voltage device；
The convert of capacitor to voltage device：Signal and processing for receiving moisture detector transmission, then by the signal after processing
Send analog-digital converter to；
The temperature sensor：For detection temperature signal and transmit a signal to analog-digital converter；
The analog-digital converter：Signal and processing for receiving convert of capacitor to voltage device and temperature sensor transmission, then will
Signal after processing sends central processing unit to；
The keyboard：For inputting control signal for user and sending control signal to central processing unit；
The central processing unit：Signal and processing for receiving analog-digital converter and keyboard transmission, then by the letter after processing
Number send digital analog converter to；
The digital analog converter：The signal transmitted for central processing unit and processing, then send the signal after processing to aobvious
Show device；
The display：Signal and display for receiving digital analog converter transmission.
2. a kind of amendment type moisture detector according to claim 1, it is characterised in that also including signal generator, institute
Signal generator is stated to be connected with moisture detector, for producing pumping signal and sending moisture detector to, the water content detection
Device is additionally operable to receive the signal of signal generator transmission and transmits a signal to convert of capacitor to voltage device.
3. a kind of amendment type moisture detector according to claim 1, it is characterised in that in convert of capacitor to voltage device and mould
DC amplification circuit is also associated between number converter.
4. a kind of amendment type moisture detector according to claim 3, it is characterised in that the DC amplification circuit includes
First triode (VT1), the second triode (VT2), the first power supply (E1) and second source (E2), the first triode (VT1) and
The emitter stage of second triode (VT2) is grounded, the base stage of the first triode (VT1) as DC amplification circuit input,
First resistor (R1), the collection of the first triode (VT1) are connected between the base stage and the first power supply (E1) of first triode (VT1)
Second resistance (R2), the colelctor electrode and the second triode of the first triode (VT1) are connected between electrode and the first power supply (E1)
(VT2) 3rd resistor (R3) is connected between base stage, is connected between the base stage and second source (E2) of the second triode (VT2)
There is the 5th resistance (R5), the colelctor electrode of the second triode (VT2) is used as the output end of DC amplification circuit, and the second triode
(VT2) the 4th resistance (R4) is connected between colelctor electrode and the first power supply (E1).
5. a kind of amendment type moisture detector according to claim 1-4 any one, it is characterised in that also including report
Alert device, the alarm is connected with central processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710231968.9A CN107014875A (en) | 2017-04-11 | 2017-04-11 | A kind of amendment type moisture detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710231968.9A CN107014875A (en) | 2017-04-11 | 2017-04-11 | A kind of amendment type moisture detector |
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| Publication Number | Publication Date |
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| CN107014875A true CN107014875A (en) | 2017-08-04 |
Family
ID=59446347
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710231968.9A Pending CN107014875A (en) | 2017-04-11 | 2017-04-11 | A kind of amendment type moisture detector |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1963481A (en) * | 2006-11-28 | 2007-05-16 | 中北大学 | Intelligent testing system for moisture of cotton fiber |
| CN200959007Y (en) * | 2006-10-09 | 2007-10-10 | 罗成石 | Water-content determiner |
| CN102331446A (en) * | 2011-10-14 | 2012-01-25 | 浙江大学 | On-line grain moisture measuring device |
| CN102393408A (en) * | 2011-11-03 | 2012-03-28 | 西北农林科技大学 | Capacitive detector for moisture content of straw |
| CN202649160U (en) * | 2012-06-07 | 2013-01-02 | 汤建峰 | Grain moisture detector |
| CN102967635A (en) * | 2012-12-09 | 2013-03-13 | 大连创达技术交易市场有限公司 | Material water detection device |
| CN202956357U (en) * | 2012-12-24 | 2013-05-29 | 吉林工商学院 | Device for detecting moisture content of grains on line |
-
2017
- 2017-04-11 CN CN201710231968.9A patent/CN107014875A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200959007Y (en) * | 2006-10-09 | 2007-10-10 | 罗成石 | Water-content determiner |
| CN1963481A (en) * | 2006-11-28 | 2007-05-16 | 中北大学 | Intelligent testing system for moisture of cotton fiber |
| CN102331446A (en) * | 2011-10-14 | 2012-01-25 | 浙江大学 | On-line grain moisture measuring device |
| CN102393408A (en) * | 2011-11-03 | 2012-03-28 | 西北农林科技大学 | Capacitive detector for moisture content of straw |
| CN202649160U (en) * | 2012-06-07 | 2013-01-02 | 汤建峰 | Grain moisture detector |
| CN102967635A (en) * | 2012-12-09 | 2013-03-13 | 大连创达技术交易市场有限公司 | Material water detection device |
| CN202956357U (en) * | 2012-12-24 | 2013-05-29 | 吉林工商学院 | Device for detecting moisture content of grains on line |
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Application publication date: 20170804 |