CN102175696A - Method and device for measuring moisture of material - Google Patents

Method and device for measuring moisture of material Download PDF

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Publication number
CN102175696A
CN102175696A CN 201110035905 CN201110035905A CN102175696A CN 102175696 A CN102175696 A CN 102175696A CN 201110035905 CN201110035905 CN 201110035905 CN 201110035905 A CN201110035905 A CN 201110035905A CN 102175696 A CN102175696 A CN 102175696A
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China
Prior art keywords
microwave
signal
microwave signal
antenna
moisture
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CN 201110035905
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Inventor
衣宏昌
林谦
梁漫春
孙宇
杨洁
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Tsinghua University
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Tsinghua University
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Priority to CN 201110035905 priority Critical patent/CN102175696A/en
Publication of CN102175696A publication Critical patent/CN102175696A/en
Pending legal-status Critical Current

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Abstract

The invention provides a method and device for measuring the moisture of a material. The method comprises the following steps of: transmitting a microwave signal to the material to be measured, and receiving a microwave signal transmitted through the material; measuring the thickness of the material through an ultrasonic distance measurement method; and determining the moisture content of the material according to the transmitted microwave signal, the received microwave signal and the thickness of the material. By means of the method and the device disclosed by the invention, the moisture content of the material is determined by combining an ultrasonic distance measurement technology with a microwave transmission technology and utilizing the material thickness information measured through the ultrasonic distance measurement technology and the phase and amplitude change information of microwaves, and therefore the accuracy of moisture measurement is improved.

Description

Measure the method and the device of material moisture
Technical field
The present invention relates to technical field of measuring equipment, particularly a kind of material is measured the method and the device of moisture.
Background technology
The material moisture analysis occupies considerable status in the commercial production activity.The method of measurement material moisture commonly used comprises at present: oven drying method, NEUTRON METHOD, capacitance method, infrared reflection method and microwave method etc.These methods all have some products, but all have some shortcomings.
Oven drying method: sample is heated under rated condition, water evaporates is wherein fallen, the quality of the remaining dry of weighing compares definite moisture with initial gross mass again.This method principle is simple and can access the exact value of material moisture, but this method is made sample complexity, length consuming time.
NEUTRON METHOD: the method that adopts moderation of neutrons method and fast neutron to penetrate is usually measured the content of protium in the material, determines moisture according to the content of protium again.The problem of this method is to be subjected to organic substance influence in the material easily, and radioactive source meeting radiation neutron, has the radiation protection problem.
Capacitance method: the moisture of determining material by the conductivity of measuring material.This method is subjected to the influence of material self character, raw meal particle size, solid accumulation density etc. easily, causes measurement result inaccurate.
Infrared reflection method: according under the condition of some wavelength, water is measured the moisture of material greater than its all band to the absorption of infrared light.The problem that this method exists is to measure the moisture on shallow surface, can't accurately measure for thicker material.
Microwave method: comprise that transmission beam method, reflectometry resonant cavity method are several, by measuring the effect of material, for example reflect, decay, phase shift or resonance etc., determine the moisture of material to microwave.Use the microwave transmission method to carry out moisture measurement and can obtain higher measuring accuracy, still, the thickness effect that this method is subjected to tested material is bigger.For this reason, existing a kind of solution is proofreaied and correct for the method that adopts the radioactivity thickness measuring, but is to use the very inconvenient and difficult acceptance of user of radioactivity; Another kind of solution is carried out flow measurement for adopting belted electronic balance, but the response time gap of the response time of belted electronic balance output quantity and microwave measurement data is bigger, the two is difficult to synchronous in time, belted electronic balance is a contact type measurement simultaneously, and industrial site its reliability more abominable at environment is lower.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly proposes a kind of method and device of measuring material moisture.
For achieving the above object, one aspect of the present invention proposes a kind of method of measuring material moisture, may further comprise the steps: to the material launched microwave signal that will measure, and receive the microwave signal that described material is crossed in transmission; Measure the thickness of described material by the method for supersonic sounding; And, determine the moisture of described material according to the microwave signal of the microwave signal of described emission, described reception and the thickness of described material.
In one embodiment of the invention, described method by supersonic sounding is measured the thickness of described material, further comprises: the distance of measuring the upper surface and the described ultrasonic range finder sensor of described material by ultrasonic range finder sensor; According to distance and the upper surface of described material and the distance of described ultrasonic range finder sensor of predefined described ultrasonic range finder sensor, determine the thickness of described material again with the belt of the described material of carrying.
In one embodiment of the invention, the microwave signal of described microwave signal according to described emission, described reception and the thickness of described material are determined the moisture of described material, further comprise: phase change and the changes in amplitude of determining microwave signal according to the microwave signal of the microwave signal of described emission and described reception; And the moisture of determining described material according to the phase change of described microwave signal and changes in amplitude and described material thickness.
Another side of the present invention also provides a kind of device of measuring material moisture, it is characterized in that, comprising: microwave signal source is used to produce microwave signal; Microwave Net is connected with described microwave signal source, is used for the microwave signal that described microwave signal source produces is divided into two way microwave signals; The microwave emitting antenna is connected with described Microwave Net, is used for that riches all the way is incident upon the material that will measure with described two way microwave signals; Microwave antenna is connected with described Microwave Net, is used to receive the microwave signal that described material is crossed in transmission; Ultrasonic range finder sensor is used to measure the upper surface of described material and the distance signal between the described ultrasonic range finder sensor; Signal processing circuit, link to each other with described ultrasonic range finder sensor with described Microwave Net, be used for receiving microwave signal, another road of described two way microwave signals and the distance signal that described ultrasonic range finder sensor is measured that described microwave antenna receives, and the phase change and the changes in amplitude of microwave signal are determined in another road of microwave signal that receives according to described microwave antenna and described two way microwave signals; And computing unit, link to each other with described signal processing circuit, the distance of measuring according to described ultrasonic range finder sensor is determined the thickness of described material, and according to thickness and the phase change of described microwave signal and the moisture that changes in amplitude is determined described material of described material.
In one embodiment of the invention, described microwave emitting antenna and described microwave antenna center are provided with coaxially.
In one embodiment of the invention, described device also comprises: frame, and the belt that carries described material passes described frame, and described microwave emitting antenna is positioned on the top of described frame.In one embodiment, described microwave antenna is positioned on the bottom of described frame; In another embodiment, described microwave emitting antenna is positioned on the bottom of described frame, and described microwave antenna is positioned on the top of described frame.
In one embodiment of the invention, described device also comprises: lay respectively at top and the first microwave antenna case on the bottom and the second microwave antenna case of described frame, described microwave emitting antenna and described microwave antenna lay respectively in the described first microwave antenna case and the second microwave antenna case.
In one embodiment of the invention, be provided with first opening, be provided with second opening at the upper surface of the microwave antenna case of the bottom that is positioned at described frame at the lower surface of the microwave antenna case at the top that is positioned at described frame.Described first opening and described second opening use the permeable material of microwave to block.
In one embodiment of the invention, described ultrasonic range finder sensor is arranged on the frame of top of described belt, and there is predetermined distance with the upper surface of described belt, described ultrasonic range finder sensor emission downwards is ultrasonic, and described ultrasonic range finder sensor and described microwave emitting antenna are provided with along the ground, traffic direction front and back of described belt, and described ultrasonic range finder sensor emission downwards is ultrasonic.
In one embodiment of the invention, described device also comprises: be positioned at the cabinet at the back of described frame, described microwave signal source, described Microwave Net and described signal processing circuit are arranged in described cabinet.
The present invention utilizes material thickness information and the phase change of microwave and the moisture that changes in amplitude information is determined material of supersonic sounding commercial measurement by the supersonic sounding technology is combined with the microwave transmission technology, improves the precision of moisture measurement.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the process flow diagram of method of the measurement material moisture of the embodiment of the invention;
Fig. 2 is the structural representation of device of the measurement material moisture of the embodiment of the invention; And
Fig. 3 is the structural drawing of device of the measurement material moisture of one embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
Be illustrated in figure 1 as the process flow diagram of method of the measurement material moisture of the embodiment of the invention, this method may further comprise the steps:
Step S101 to the material launched microwave signal that will measure, and receives the microwave signal that material is crossed in transmission.
Step S102, the method by supersonic sounding is measured the thickness of material.
In one embodiment of the invention, by ultrasonic range finder sensor measure the upper surface of material and this ultrasonic range finder sensor apart from d 1, again since between ultrasonic range finder sensor and the belt that carries material apart from d 2Therefore preestablish knownly, use d 2Deduct d 1Can get the thickness of material.
Step S103 according to microwave signal, the microwave signal of reception and the thickness of material of emission, determines the moisture of material.
Particularly, at first, the microwave signal of emission and the microwave signal of reception are compared changes in amplitude and the phase change of determining microwave signal; Then, determine the moisture of material according to the thickness of the changes in amplitude of microwave signal and phase change and material.
Method of the present invention is measured the thickness information of material by the method that adopts supersonic sounding, because hyperacoustic characteristic, the response time of the response time of ultrasonic range finder sensor and microwave measurement data can keep synchronous substantially, and the method for supersonic sounding can obtain material thickness information reliably, therefore, determine the moisture of material in conjunction with this material thickness information, can improve the precision of moisture measurement.
For realizing the foregoing description, the present invention also provides a kind of device of measuring material moisture.Be illustrated in figure 2 as the structural representation of device of the measurement material moisture of the embodiment of the invention, comprise: microwave signal source 10, Microwave Net 20, microwave emitting antenna 30, microwave antenna 40, ultrasonic range finder sensor 50, signal processing circuit 60 and computing unit 70.
Microwave signal source 10 is used to produce microwave signal.Microwave Net 20 is connected with microwave signal source 10, is used for the microwave signal that microwave signal source 10 produces is divided into two-way.Microwave emitting antenna 30 is connected with Microwave Net 20, is used for that riches all the way is incident upon the material that will measure with two way microwave signals.Microwave antenna 40 is connected with Microwave Net 20, is used to receive the microwave signal that material is crossed in transmission.Ultrasonic range finder sensor 50 is used to measure the upper surface of material and the distance between it.Signal processing circuit 60 links to each other with ultrasonic range finder sensor 50 with Microwave Net 20, be used for receiving microwave signal, another road of two way microwave signals and the distance that ultrasonic range finder sensor 40 is measured that microwave antenna 40 receives, and the microwave signal that receives according to microwave antenna 40 and another road in two way microwave signals phase change and changes in amplitude of determining microwave signal.Computing unit 70 links to each other with signal processing circuit 60, and the distance of measuring according to ultrasonic range finder sensor 50 is determined the thickness of material, and according to thickness and the phase change of microwave signal and the moisture that changes in amplitude is determined material of material.
In one embodiment of the invention, microwave antenna 40 is provided with coaxially with microwave emitting antenna 30 centers.
To describe the structural drawing and the operating process of device of the measurement material moisture of one embodiment of the invention below in detail, so that aspects and advantages of the present invention are more obvious.
Be illustrated in figure 3 as the structural drawing of device of the measurement material moisture of one embodiment of the invention, this device comprises: frame 1, microwave signal source 10, Microwave Net 20, microwave emitting antenna 30, microwave antenna 40, ultrasonic range finder sensor 50, signal processing circuit 60, computing machine 70.The belt 13 of carrying material 12 passes frame 1, and microwave emitting antenna 20 is arranged on the top of frame 1, and microwave antenna 30 is arranged on the bottom of frame 1 and coaxial with microwave emitting antenna 20 centers.Microwave Net 20 has four ports, and microwave signal source 10, microwave antenna 40, microwave emitting antenna 30 insert Microwave Net 20 by a port respectively with signal processing circuit 60.Ultrasonic range finder sensor 50 inserts signal processing circuit 60.Signal processing circuit 60 has an interface to be connected with power supply, and another interface is connected with computing machine 70 serial ports.
In the present embodiment, microwave emitting antenna 30 and microwave antenna 40 can be coaxial with the center of belt 13.Frame 1 can be C type frame, also can be the frame of other shapes.
In addition, in the present embodiment, for fear of the influence to microwave antenna and electric connection thereof such as dust and water, can be provided with the first microwave antenna case 9 at the top of frame 1, be provided with the second microwave antenna case 11 in the bottom of frame 1, microwave emitting antenna 30 is arranged in the first microwave antenna case 9, and microwave antenna 40 is arranged in the second microwave antenna case 11.The position that should be understood that microwave emitting antenna 30 and microwave antenna 40 also can exchange, and for example microwave emitting antenna 30 is arranged in the second microwave antenna case 11, and microwave antenna 40 is arranged in the first microwave antenna case 9.In addition, for convenience transmitting and receiving of microwave can be provided with first opening at the lower surface of the first microwave antenna case 9, is provided with second opening at the upper surface of the second microwave antenna case 11, for dustproof and waterproof etc., can use microwave to shelter from first opening and second opening by saturating material again.
In embodiments of the present invention, ultrasonic range finder sensor 50 is arranged on the frame 1 of top of belt 13, and and the upper surface of belt 13 between have predetermined distance, the distance variable that this is predetermined.Ultrasonic range finder sensor 50 is provided with the ground, traffic direction front and back of microwave emitting antenna 30 along belt 13, and ultrasonic range finder sensor 50 emission downwards is ultrasonic.
In the present embodiment, in order to prevent that dust, water, electromagnetic interference (EMI) etc. to the circuit devcie damage, also can be provided with cabinet 14 at the back of frame 1, microwave signal source 10, Microwave Net 20 are arranged in the cabinet 11 with signal processing circuit 60.
The above-mentioned first microwave antenna case 9, the second microwave antenna case 11 and cabinet 14 can be fixed on the frame 1 by the mode of welding, also can be fixed on the frame 1 by other fixed forms certainly.In addition, the first microwave antenna case 9, the second microwave antenna case 11 and cabinet 14 also can be installed on the different positions, and for example, cabinet 14 can be installed near any position of frame 1.
Referring to figs. 2 and 3, when measuring, the belt 13 that is loaded with material 12 passes frame 1, at this moment, microwave signal source 10 sends microwave signal, be divided into two-way after microwave signal process Microwave Net 20 power division, one tunnel (microwave signal A shown in Figure 2) enters microwave emitting antenna 30, and another road is as reference signal (reference signal shown in Figure 2).The microwave signal transmission that enters microwave emitting antenna 30 crosses that material 12 on the belt 13 is laggard goes into microwave receiving antenna 40, microwave antenna 40 inputs to Microwave Net 20 (promptly with the microwave signal that receives, microwave signal B shown in Fig. 2), pass through together entering signal treatment circuit 60 of Microwave Net 20 and another road microwave signal (that is reference signal) before again.Ultrasonic range finder sensor 50 is sent distance measuring signal into signal processing circuit 60.Signal processing circuit 60 is determined the changes in amplitude and the phase change of microwave signal according to reference signal and microwave signal B, and determine ranging information according to distance measuring signal, then the changes in amplitude of microwave signal and phase change and ranging information are sent in the computing machine 70.Computing machine 70 obtains the thickness information of material according to ranging information, carries out material moisture together with changes in amplitude and phase change again and calculates.
Should be understood that device of the present invention can also link to each other with automatic control system, make automatic control system regulate according to the moisture in the measurement result control material.
The present invention utilizes material thickness information and the phase change of microwave and the moisture that changes in amplitude information is determined material of supersonic sounding commercial measurement by the supersonic sounding technology is combined with the microwave transmission technology, improves the precision of moisture measurement.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification that scope of the present invention is by claims and be equal to and limit to these embodiment.

Claims (13)

1. a method of measuring material moisture is characterized in that, may further comprise the steps:
To the material launched microwave signal that will measure, and receive the microwave signal that described material is crossed in transmission;
Measure the thickness of described material by the method for supersonic sounding; And
According to the microwave signal of the microwave signal of described emission, described reception and the thickness of described material, determine the moisture of described material.
2. the method for measurement material moisture according to claim 1 is characterized in that, described method by supersonic sounding is measured the thickness of described material, further comprises:
Measure the distance of the upper surface and the described ultrasonic range finder sensor of described material by ultrasonic range finder sensor; And, determine the thickness of described material according to distance and the upper surface of described material and the distance of described ultrasonic range finder sensor of predefined described ultrasonic range finder sensor with the belt of the described material of carrying.
3. the method for measurement material moisture according to claim 1 is characterized in that, the microwave signal of described microwave signal according to described emission, described reception and the thickness of described material are determined the moisture of described material, further comprise:
Determine the phase change and the changes in amplitude of microwave signal according to the microwave signal of the microwave signal of described emission and described reception; And
Determine the moisture of described material according to the phase change of described microwave signal and changes in amplitude and described material thickness.
4. a device of measuring material moisture is characterized in that, comprising:
Microwave signal source is used to produce microwave signal;
Microwave Net is connected with described microwave signal source, is used for the microwave signal that described microwave signal source produces is divided into two way microwave signals;
The microwave emitting antenna is connected with described Microwave Net, is used for that riches all the way is incident upon the material that will measure with described two way microwave signals;
Microwave antenna is connected with described Microwave Net, is used to receive the microwave signal that described material is crossed in transmission;
Ultrasonic range finder sensor is used to measure the upper surface of described material and the distance between the described ultrasonic range finder sensor;
Signal processing circuit, be connected with ultrasonic range finder sensor with described Microwave Net, be used to receive microwave signal, another road of described two way microwave signals and the distance signal that described ultrasonic range finder sensor is measured that described microwave antenna receives, and the phase change and the changes in amplitude of microwave signal are determined in another road of microwave signal that receives according to described microwave antenna and described two way microwave signals;
Computing unit, link to each other with described signal processing circuit, the distance signal of measuring according to described ultrasonic range finder sensor is determined the thickness of described material, and according to thickness and the phase change of described microwave signal and the moisture that changes in amplitude is determined described material of described material.
5. the device of measurement material moisture according to claim 4 is characterized in that, described microwave emitting antenna and described microwave antenna center are provided with coaxially.
6. the device of measurement material moisture according to claim 4 is characterized in that, also comprises: frame, the belt that carries described material passes described frame.
7. the device of measurement material moisture according to claim 6 is characterized in that, described microwave emitting antenna is positioned on the top of described frame, and described microwave antenna is positioned on the bottom of described frame.
8. the device of measurement material moisture according to claim 6 is characterized in that, described microwave emitting antenna is positioned on the bottom of described frame, and described microwave antenna is positioned on the top of described frame.
9. the device of measurement material moisture according to claim 4, it is characterized in that, also comprise: lay respectively at the first microwave antenna case and the second microwave antenna case of the top and the bottom of described frame, described microwave emitting antenna and described microwave antenna are separately positioned in described first microwave antenna case and the described second microwave antenna case.
10. the device of measurement material moisture according to claim 9 is characterized in that, is provided with first opening at the lower surface of the microwave antenna case at the top that is positioned at described frame, is provided with second opening at the upper surface of the microwave antenna case of the described bottom that is positioned at frame.
11. the device of measurement material moisture according to claim 10 is characterized in that, described first opening and described second opening use the permeable material of microwave to block.
12. the device of measurement material moisture according to claim 6, it is characterized in that, described ultrasonic range finder sensor is arranged on the frame of top of described belt, and there is predetermined distance with the upper surface of described belt, and described ultrasonic range finder sensor and described microwave emitting antenna are provided with along the ground, traffic direction front and back of described belt, and described ultrasonic range finder sensor is launched ultrasound wave downwards.
13. the device of measurement material moisture according to claim 6 is characterized in that, also comprises: be positioned at the cabinet at the back of described frame, described microwave signal source, described Microwave Net and described signal processing circuit are arranged in described cabinet.
CN 201110035905 2011-02-10 2011-02-10 Method and device for measuring moisture of material Pending CN102175696A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104670839A (en) * 2013-11-29 2015-06-03 航天信息股份有限公司 Material conveying device
CN107238611A (en) * 2017-06-05 2017-10-10 默斯测控技术(长沙)有限公司 Analysis of moisture content method, device and drimeter and measuring method
CN109632833A (en) * 2019-01-23 2019-04-16 浙江大学 A kind of microwave antenna detecting distance optimization devices and methods therefor applied to cereal moisture percentage detection system
CN111457868A (en) * 2020-03-19 2020-07-28 绵阳人众仁科技有限公司 Film detection method based on microwave resonance
CN112014550A (en) * 2020-08-24 2020-12-01 湖南中联重科混凝土机械站类设备有限公司 Method and device for detecting moisture content of aggregate and machine-readable storage medium
CN112798622A (en) * 2021-01-04 2021-05-14 电子科技大学 Device and method for detecting moisture content of wood based on microwave transmission principle

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CN201637696U (en) * 2010-02-11 2010-11-17 清华大学 Device for measuring water content of materials by microwave combination weighing technology

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104670839A (en) * 2013-11-29 2015-06-03 航天信息股份有限公司 Material conveying device
CN107238611A (en) * 2017-06-05 2017-10-10 默斯测控技术(长沙)有限公司 Analysis of moisture content method, device and drimeter and measuring method
CN109632833A (en) * 2019-01-23 2019-04-16 浙江大学 A kind of microwave antenna detecting distance optimization devices and methods therefor applied to cereal moisture percentage detection system
CN109632833B (en) * 2019-01-23 2020-04-17 浙江大学 Microwave antenna detection distance optimization device and method applied to grain water content detection system
CN111457868A (en) * 2020-03-19 2020-07-28 绵阳人众仁科技有限公司 Film detection method based on microwave resonance
CN112014550A (en) * 2020-08-24 2020-12-01 湖南中联重科混凝土机械站类设备有限公司 Method and device for detecting moisture content of aggregate and machine-readable storage medium
CN112798622A (en) * 2021-01-04 2021-05-14 电子科技大学 Device and method for detecting moisture content of wood based on microwave transmission principle
CN112798622B (en) * 2021-01-04 2022-05-17 电子科技大学 Device and method for detecting moisture content of wood based on microwave transmission principle

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Application publication date: 20110907