CN108445051A - A kind of online device for testing moisture content of wood - Google Patents
A kind of online device for testing moisture content of wood Download PDFInfo
- Publication number
- CN108445051A CN108445051A CN201810471439.0A CN201810471439A CN108445051A CN 108445051 A CN108445051 A CN 108445051A CN 201810471439 A CN201810471439 A CN 201810471439A CN 108445051 A CN108445051 A CN 108445051A
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- moisture content
- capacitance
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- temperature
- controller
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- 239000002023 wood Substances 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 239000000523 sample Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000003750 conditioning effect Effects 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- 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
Abstract
The present invention discloses a kind of online device for testing moisture content of wood.The detection device includes capacitance acquisition module, temperature collecting module, controller and host computer；The capacitance acquisition module is located at the both sides of the timber, the capacitance signal for acquiring timber；The temperature collecting module, the interior temperature signal for acquiring lumber kiln；The controller, it is connect respectively with the capacitance acquisition module, the temperature collecting module, the temperature signal of temperature collecting module acquisition described in capacitance signal and real-time reception for the acquisition of real-time reception capacitance acquisition module is simultaneously filtered, it obtains summarizing data, and summarize the dielectric constant that data determine timber for basis, and the moisture content of timber is determined according to the dielectric constant；The host computer is connect with the controller, for receiving moisture content described in the moisture content and real-time display.Device using the present invention can improve the accuracy of moisture content measurement.
Description
Technical field
The present invention relates to moisture content detection fields, more particularly to a kind of online device for testing moisture content of wood.
Background technology
Existing timber moisture content meter is to be based on resistance measurement principle, by measuring the resistance of timber, is judged indirectly
The moisture content of timber itself.Specific equipment component part：Measuring probe (being based on resistance principle), host.Measuring probe is base
In the principle of resistance measurement, it is contoured to sharp nail shape, convenient for injecting wood internal.Host is responsible for acquiring measuring probe
Data, be converted and be calculated as corresponding moisture content information, while being responsible for the communication with external upper computer equipment.It is former from measuring
In reason, first, when moisture content is more than 30%, the ratio of internal Free water is very high, at this point, the small change of moisture content
Change and be reflected in almost very little in the variation of resistance, the accuracy and sensitivity measured is caused to be greatly reduced.Secondly, it pops one's head in by two
Branch needle electrode is constituted, and is the problem of calculating moisture content, bring in this way by two interelectrode resistance variations：When electrode penetrates
When the depth of timber is inconsistent, measurement result is also just multifarious.In addition, only some partial points that needle electrode measures contain
Water rate information, reality in, with the difference of timber deep, moisture content be it is different, then, the measurement knot of this needle electrode
Fruit, which has accidental factor, to be occurred.In addition, traditional measurement method is often related to the density of timber itself, and timber has ten million
Kind, corresponding density is also not quite similar, and even for same timber, and the different age of trees, different growing environments correspond to
Moisture content it is different.The acquisition of this parameter is nearly impossible, can only be replaced with estimated value, measurement is thus caused
As a result inaccuracy.Finally, the means detected using needle probe, which are belonged to, damages detection, destroys the form of timber, certain fields
Conjunction does not allow.
Invention content
The object of the present invention is to provide a kind of online device for testing moisture content of wood, improve the standard that moisture content measures
True property.
To achieve the above object, the present invention provides following schemes：
A kind of online device for testing moisture content of wood, the detection device include capacitance acquisition module, temperature acquisition mould
Block, controller and host computer；
The capacitance acquisition module is located at the both sides of the timber, the capacitance signal for acquiring timber；
The temperature collecting module, the interior temperature signal for acquiring lumber kiln；
The controller is connect with the capacitance acquisition module, the temperature collecting module respectively, for real-time reception electricity
Hold the temperature signal of temperature collecting module acquisition described in the capacitance signal and real-time reception of acquisition module acquisition and is filtered place
Reason obtains summarizing data, and summarizes the dielectric constant that data determine timber for basis, and determines wood according to the dielectric constant
The moisture content of material；
The host computer is connect with the controller, for receiving moisture content described in the moisture content and real-time display.
Optionally, the controller uses STM32F103ZE.
Optionally, the detection device further includes signal conditioning circuit, is connect with the temperature collecting module.
Optionally, the detection device further includes capacitance/voltage conversion circuit, is connect with the capacitance acquisition module.
Optionally, the detection device also packet analog to digital conversion circuit, respectively with the signal conditioning circuit and the capacitance/
Voltage conversion circuit connects, and for temperature analog signal to be converted to temperature digital signal, capacitance/voltage analog signal is converted
For/voltage digital signal.
Optionally, the detection device further includes coaxial cable, the input terminal of the coaxial cable respectively with the capacitance
Acquisition module is connected with the temperature collecting module, and the output end of the coaxial cable is connect with the controller.
Optionally, the controller connection is connect by RS485 buses with the host computer.
Optionally, the detection device further includes JTAG emulators, is connect with the controller.
Optionally, the controller is connect by RS232 buses with the JTAG emulators.
Optionally, the temperature collecting module is the temperature measurement probe of PT100 platinum resistance.
According to specific embodiment provided by the invention, the invention discloses following technique effects：The present invention provides one kind and exists
Wire type device for testing moisture content of wood, including capacitance acquisition module, temperature collecting module, controller and host computer, by entirety
Detection device is held in dry kiln, and temperature collecting module acquires the interior temperature signal of lumber kiln, capacitance acquisition module
Positioned at the both sides of the timber, the capacitance signal of timber is acquired by capacitance acquisition module；Controller and capacitance acquisition module with
Temperature collecting module connects, the capacitance signal and real-time reception temperature acquisition mould of the acquisition of controller real-time reception capacitance acquisition module
The temperature signal of block acquisition is simultaneously filtered, and obtains summarizing data；Host computer is connect with controller, and host computer is for receiving
It is described summarize summarize data described in data and real-time display.The present invention is based on the principle of capacitance measurement, with timber moisture content with
The correspondence of dielectric constant is foundation, and the variation of capacitance is detected by capacitance acquisition module, dielectric is obtained by numerical computations
Constant, to calculate moisture content, the present invention is by the variation of the reacting condition of moisture content to dielectric constant, relative resistance
Mensuration, the range bigger of measurement, sensitivity higher realize non-destructive testing further, since without penetrating wood internal.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the online device for testing moisture content of wood structure chart of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of online device for testing moisture content of wood, improve the standard that moisture content measures
True property.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the online device for testing moisture content of wood structure chart of the embodiment of the present invention.As shown in Figure 1, a kind of online
Device for testing moisture content of wood, the detection device include capacitance acquisition module 1, temperature collecting module 2, controller 3 and upper
Machine 4；
The capacitance acquisition module 1 is located at the both sides of the timber, the capacitance signal for acquiring timber；
The temperature collecting module 2, the interior temperature signal for acquiring lumber kiln；
The controller 3 is connect respectively with the capacitance acquisition module 1, the temperature collecting module 2, for connecing in real time
Receive the temperature signal that temperature collecting module 2 acquires described in the capacitance signal and real-time reception of 1 acquisition of capacitance acquisition module and progress
It is filtered, obtains summarizing data, and summarize the dielectric constant that data determine timber for basis, and according to the dielectric constant
Determine the moisture content of timber；
The host computer 4 is connect with the controller 3, for receiving moisture content described in the moisture content and real-time display.
The controller 3 uses STM32F103ZE.
The detection device further includes signal conditioning circuit, is connect with the temperature collecting module.
The detection device further includes capacitance/voltage conversion circuit, is connect with the capacitance acquisition module.
The detection device also packet analog to digital conversion circuit turns with the signal conditioning circuit and the capacitance/voltage respectively
Circuit connection is changed, for temperature analog signal to be converted to temperature digital signal, capacitance/voltage analog signal is converted into/electricity
Press digital signal.
The detection device further includes coaxial cable, the input terminal of the coaxial cable respectively with the capacitance acquisition module
It is connected with the temperature collecting module, the output end of the coaxial cable is connect with the controller.
The connection of the controller 3 is connect by RS485 buses with the host computer.
The detection device further includes JTAG emulators, is connect with the controller.
The controller 3 is connect by RS232 buses with the JTAG emulators.
The temperature collecting module 2 is the temperature measurement probe of PT100 platinum resistance.
The present invention is the principle based on capacitance measurement, using timber in the correspondence of moisture content and dielectric constant as foundation,
By the variation of capacitance between detection probe, dielectric constant is calculated, passes through the correspondence between dielectric constant and moisture content
Obtain moisture content.In addition, use capacity plate antenna electrode in design, by probe clip at plank both ends, in this way, measure be timber this
The average moisture content of this effective coverage, it is as a result more reliable.In addition, being loaded into spy using the pumping signal of different frequency in design
On head, the density value of timber is calculated according to frequency response characteristic, avoids artificial input density of wood.Also achieve lossless inspection
The purpose of survey.
In certain temperature range, certain variation can occur for dielectric constant when temperature often increases 1 DEG C, therefore timber is not
At same temperature, dielectric constant is different, and because the dielectric constant of timber has certain correspondence with its moisture content,
Therefore, at different temperature, the moisture content of timber is also different.
The timber of different densities is different the pumping signal of different frequency, passes through the wood to a large amount of different densities
Material is tested, and is chosen the frequency of 200KHZ, 350KHZ, 500KHZ, 650HZ as pumping signal, is obtained the seeds of different densities
Frequency response relationship (under different frequency, the timber attenuation slope of each density is different), mathematics is fitted using MATLAB softwares
Formula.On this basis, according to the frequency response of the timber of different densities, the density value of timber is measured；
The present invention is by the variation of the reacting condition of moisture content to dielectric constant, relative resistance mensuration, measurement
Range bigger, sensitivity higher.Capacity plate antenna electrode is used in design, by probe clip at plank both ends, in this way, what is measured is wood
The average moisture content of this this effective coverage of material, it is as a result more reliable.Due to not having to penetrate wood internal, non-destructive testing is realized.
In the scheme of capacitance measurement, other means can be selected, such as integrated capacitance acquisition chip is (chip-shaped
Number include AD7745 series, CAV424 etc.) capacitance is directly converted into digital quantity.It can also realize goal of the invention.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
Principle and implementation of the present invention are described for specific case used herein, and above example is said
The bright method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (10)
1. a kind of online device for testing moisture content of wood, which is characterized in that the detection device includes capacitance acquisition module, temperature
Spend acquisition module, controller and host computer；
The capacitance acquisition module is located at the both sides of the timber, the capacitance signal for acquiring timber；
The temperature collecting module, the interior temperature signal for acquiring lumber kiln；
The controller connect with the capacitance acquisition module, the temperature collecting module, is adopted for real-time reception capacitance respectively
The temperature signal of temperature collecting module acquisition described in the capacitance signal and real-time reception of collection module acquisition is simultaneously filtered, and is obtained
To summarizing data, and for according to summarizing the dielectric constant that data determine timber, and timber is determined according to the dielectric constant
Moisture content；
The host computer is connect with the controller, for receiving moisture content described in the moisture content and real-time display.
2. online device for testing moisture content of wood according to claim 1, which is characterized in that the controller uses
STM32F103ZE。
3. online device for testing moisture content of wood according to claim 1, which is characterized in that the detection device is also wrapped
Signal conditioning circuit is included, is connect with the temperature collecting module.
4. online device for testing moisture content of wood according to claim 3, which is characterized in that the detection device is also wrapped
Capacitance/voltage conversion circuit is included, is connect with the capacitance acquisition module.
5. online device for testing moisture content of wood according to claim 4, which is characterized in that the detection device is also wrapped
Analog to digital conversion circuit is connect with the signal conditioning circuit and the capacitance/voltage conversion circuit respectively, is used for temperature simulation
Signal is converted to temperature digital signal, and capacitance/voltage analog signal is converted to/voltage digital signal.
6. online device for testing moisture content of wood according to claim 1, which is characterized in that the detection device is also wrapped
Coaxial cable is included, the input terminal of the coaxial cable is connect with the capacitance acquisition module and the temperature collecting module respectively,
The output end of the coaxial cable is connect with the controller.
7. online device for testing moisture content of wood according to claim 1, which is characterized in that the controller connection is logical
RS485 buses are crossed to connect with the host computer.
8. online device for testing moisture content of wood according to claim 1, which is characterized in that the detection device is also wrapped
JTAG emulators are included, are connect with the controller.
9. online device for testing moisture content of wood according to claim 8, which is characterized in that the controller passes through
RS232 buses are connect with the JTAG emulators.
10. online device for testing moisture content of wood according to claim 1, which is characterized in that the temperature acquisition mould
Block is the temperature measurement probe of PT100 platinum resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810471439.0A CN108445051A (en) | 2018-05-17 | 2018-05-17 | A kind of online device for testing moisture content of wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810471439.0A CN108445051A (en) | 2018-05-17 | 2018-05-17 | A kind of online device for testing moisture content of wood |
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| Publication Number | Publication Date |
|---|---|
| CN108445051A true CN108445051A (en) | 2018-08-24 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810471439.0A Pending CN108445051A (en) | 2018-05-17 | 2018-05-17 | A kind of online device for testing moisture content of wood |
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| Country | Link |
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| CN (1) | CN108445051A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007087A (en) * | 2019-11-12 | 2020-04-14 | 北京林业大学 | Nondestructive testing sensor, system and method for freeze-thaw characteristics of standing trees |
| CN111426884A (en) * | 2020-04-24 | 2020-07-17 | 东北林业大学 | Method for mapping wood cross section resistance distribution |
| CN113092303A (en) * | 2021-03-05 | 2021-07-09 | 南京南大工程检测有限公司 | Nondestructive testing method for water content of ancient building wood member |
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|---|---|---|---|---|
| CN1108910A (en) * | 1993-12-03 | 1995-09-27 | 吉第联合股份公司 | Method and device for determining the density of a stream of fibrous material on a cigarette manufacturing machine |
| CN102393408A (en) * | 2011-11-03 | 2012-03-28 | 西北农林科技大学 | Capacitive detector for moisture content of straw |
| CN203930084U (en) * | 2014-04-11 | 2014-11-05 | 深圳市凯利博实业有限公司 | Medium detector |
| CN106153692A (en) * | 2016-09-12 | 2016-11-23 | 山东农业大学 | A kind of cereal moisture percentage on-line equipment based on dielectric parameter and measuring method thereof |
-
2018
- 2018-05-17 CN CN201810471439.0A patent/CN108445051A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108910A (en) * | 1993-12-03 | 1995-09-27 | 吉第联合股份公司 | Method and device for determining the density of a stream of fibrous material on a cigarette manufacturing machine |
| CN102393408A (en) * | 2011-11-03 | 2012-03-28 | 西北农林科技大学 | Capacitive detector for moisture content of straw |
| CN203930084U (en) * | 2014-04-11 | 2014-11-05 | 深圳市凯利博实业有限公司 | Medium detector |
| CN106153692A (en) * | 2016-09-12 | 2016-11-23 | 山东农业大学 | A kind of cereal moisture percentage on-line equipment based on dielectric parameter and measuring method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007087A (en) * | 2019-11-12 | 2020-04-14 | 北京林业大学 | Nondestructive testing sensor, system and method for freeze-thaw characteristics of standing trees |
| CN111426884A (en) * | 2020-04-24 | 2020-07-17 | 东北林业大学 | Method for mapping wood cross section resistance distribution |
| CN113092303A (en) * | 2021-03-05 | 2021-07-09 | 南京南大工程检测有限公司 | Nondestructive testing method for water content of ancient building wood member |
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Application publication date: 20180824 |