CN107219239B - Microwave moisture measuring method, device, equipment and storage medium - Google Patents
Microwave moisture measuring method, device, equipment and storage medium Download PDFInfo
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- CN107219239B CN107219239B CN201710439664.1A CN201710439664A CN107219239B CN 107219239 B CN107219239 B CN 107219239B CN 201710439664 A CN201710439664 A CN 201710439664A CN 107219239 B CN107219239 B CN 107219239B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/04—Investigating moisture content
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Abstract
A microwave moisture measurement method, apparatus, device and storage medium, the method in one example comprising the steps of: acquiring material type information; extracting a predetermined number of frequency information from a frequency interval corresponding to the material type information according to the material type information; controlling a microwave transmitting antenna to sequentially transmit microwave signals with frequencies corresponding to the preset number of frequency information; acquiring a microwave signal received by a microwave receiving antenna; determining the phase difference and the damping attenuation quantity of the microwave signals of each frequency received by the microwave receiving antenna relative to the microwave signals of each frequency transmitted by the microwave transmitting antenna; respectively obtaining microwave signal vectors of the microwave signals of all frequencies by superposing the first vector and the second vector by taking the phase difference of the microwave signals of all frequencies as the first vector and the damping attenuation amount as the second vector; and determining the water content of the material to be detected according to the microwave signal vector of the microwave signal of each frequency. The scheme of the embodiment improves the accuracy of microwave moisture measurement.
Description
Technical Field
The invention relates to the technical field of moisture measurement, in particular to a microwave moisture measurement method, a microwave moisture measurement device, microwave moisture measurement equipment and a storage medium.
Background
Microwave moisture measurement technology is more and more commonly applied to various industries, and can monitor the moisture content of materials in the production process so as to improve the product quality and effectively control the production process, thereby saving the cost and improving the production efficiency and the production benefit.
The basic principle of microwave moisture measurement is as follows: the microwave transmitted by the transmitting antenna penetrates through the material to be measured and reaches the receiving antenna, the microwave received by the receiving antenna is fed back to the evaluator, and the moisture content of the material to be measured is analyzed by the evaluator. When the microwave penetrates through the material, because water molecules in the material are polar molecules, the microwave is absorbed, the key feet are vibrated, electromagnetic energy is converted into heat energy, the phase difference and the amplitude attenuation of the microwave are generated, and the content of the moisture in the material can be calculated according to the two quantities.
The current microwave measurement mode is inevitably influenced by the density change of the material, and when the density of the measured material in a certain volume changes, the microwave moisture measuring instrument cannot accurately reflect the real moisture content of the measured material. Such as: when a certain volume of 6 kg of bale M containing 6% water passes through the microwave moisture meter, the microwave moisture meter reacts the material containing 6% water, and when the same volume of 12 kg of bale M containing 6% water passes through, the microwave moisture meter considers the bale M containing 12% water. This is because the weight and density of the bale M increase, and the moisture content per unit volume increases, but in reality, the actual moisture content of the bale M is still 6%, and the weight and density of the material in actual production cannot be kept strictly consistent, thereby resulting in inaccurate final measured moisture content.
Disclosure of Invention
Based on this, an object of the embodiments of the present invention is to provide a microwave moisture measuring method, a microwave moisture measuring apparatus, a device and a storage medium, so as to improve the accuracy of microwave moisture measurement.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
a microwave moisture measurement method includes the steps:
acquiring material type information;
extracting a predetermined number of frequency information from a frequency interval corresponding to the material type information according to the material type information;
controlling a microwave transmitting antenna to sequentially transmit microwave signals with frequencies corresponding to the preset number of frequency information;
acquiring a microwave signal received by a microwave receiving antenna;
determining the phase difference and the damping attenuation quantity of the microwave signals of each frequency received by the microwave receiving antenna relative to the microwave signals of each frequency transmitted by the microwave transmitting antenna;
respectively obtaining microwave signal vectors of the microwave signals of all frequencies by superposing the first vector and the second vector by taking the phase difference of the microwave signals of all frequencies as the first vector and the damping attenuation amount as the second vector;
and determining the water content of the material to be detected according to the microwave signal vector of the microwave signal of each frequency.
A microwave moisture measuring device comprising:
the type determining module is used for acquiring material type information; the frequency information determining module is used for extracting a preset number of frequency information from a frequency interval corresponding to the material type information according to the material type information;
the microwave irradiation control module is used for controlling the microwave transmitting antenna to sequentially transmit microwave signals with frequencies corresponding to the preset number of frequency information and acquiring the microwave signals received by the microwave receiving antenna;
the vector determination module is used for determining the phase difference and the damping attenuation of the microwave signals of the frequencies received by the microwave receiving antenna relative to the microwave signals of the frequencies transmitted by the microwave transmitting antenna; the phase difference of the microwave signals of each frequency is used as a first vector, the damping attenuation amount is used as a second vector, and the first vector and the second vector are superposed to respectively obtain microwave signal vectors of the microwave signals of each frequency;
and the water content determining module is used for determining the water content of the material to be detected according to the microwave signal vector of the microwave signal of each frequency.
An apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method as described above when executing the computer program.
A computer storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the above-mentioned method.
According to the aspect of the embodiment as described above, when performing microwave moisture measurement, based on the received material type selection command, frequency information is extracted from the frequency section corresponding to the material type information in the material type selection command, and a predetermined number of pieces of frequency information are extracted, and the microwave transmitting antenna is controlled to transmit microwave signals of frequencies corresponding to the extracted predetermined number of pieces of frequency information, thereby achieving measurement of moisture content based on the predetermined number of received microwave signals and the corresponding transmitted microwave signals, and when determining moisture content, the moisture content is determined based on the received microwave signals and a microwave signal vector determined by the transmitted microwave signals, thereby it transmits microwaves based on a plurality of frequencies within the frequency section corresponding to the type of the material to be measured, and determination of moisture content is achieved according to the microwave signal vector determined by the phase difference and the damping attenuation amount based on the microwave signals, thereby improving the accuracy of microwave moisture measurement.
Drawings
FIG. 1 is a schematic diagram of the structure of microwave moisture measurement in one application example;
FIG. 2 is a schematic flow diagram of a microwave moisture measurement method in one embodiment;
FIG. 3 is a schematic diagram of a microwave moisture measuring device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a schematic diagram illustrating a structural principle of microwave moisture measurement in an application example, and as shown in fig. 1, a microwave moisture measuring instrument for performing microwave moisture measurement includes an evaluator 100, a transmitting antenna 200, and a receiving antenna 300. The transmitting antenna 200 and the receiving antenna 300 may be communicatively connected to the evaluator 100 by way of high frequency transmission lines or the like. The evaluator 100 comprises a frequency controller, which may specifically comprise a quartz crystal oscillator, a low noise phase locked loop frequency, a mixer, an attenuator, a modulator, a radio frequency amplifier, a differential amplifier, a filter, a logarithmic amplifier and a phase difference comparator, and a processor.
When microwave moisture measurement is performed, the frequency controller generates a microwave signal with a specified frequency based on the control of the processor, the microwave signal is emitted through the transmitting antenna 200, and the emitted microwave signal can penetrate through a material to be measured on the non-metal conveyor belt to reach the receiving antenna 300. The microwave signal received by the receiving antenna 300 is transmitted to the evaluator 100, and the evaluator 100 calculates the water content of the material to be measured based on the microwave signal received by the receiving antenna 300 and the microwave signal transmitted by the transmitting antenna 200.
FIG. 2 shows a schematic flow diagram of a microwave moisture measurement method in one example that may be used in the evaluator of FIG. 1. As shown in fig. 2, the microwave moisture measurement method in this example includes:
step S201: acquiring material type information;
step S202: extracting a predetermined number of frequency information from a frequency interval corresponding to the material type information according to the material type information;
step S203: controlling a microwave transmitting antenna to sequentially transmit microwave signals with frequencies corresponding to the preset number of frequency information;
step S204: acquiring a microwave signal received by a microwave receiving antenna;
step S205: determining the phase difference and the damping attenuation quantity of the microwave signals of each frequency received by the microwave receiving antenna relative to the microwave signals of each frequency transmitted by the microwave transmitting antenna;
step S206: respectively obtaining microwave signal vectors of the microwave signals of all frequencies by superposing the first vector and the second vector by taking the phase difference of the microwave signals of all frequencies as the first vector and the damping attenuation amount as the second vector;
step S207: and determining the water content of the material to be detected according to the microwave signal vector of the microwave signal of each frequency.
According to the aspect of the embodiment as described above, when performing microwave moisture measurement, based on the received material type selection command, frequency information is extracted from the frequency section corresponding to the material type information in the material type selection command, and a predetermined number of pieces of frequency information are extracted, and the microwave transmitting antenna is controlled to transmit microwave signals of frequencies corresponding to the extracted predetermined number of pieces of frequency information, thereby achieving measurement of moisture content based on the predetermined number of received microwave signals and the corresponding transmitted microwave signals, and when determining moisture content, the moisture content is determined based on the received microwave signals and a microwave signal vector determined by the transmitted microwave signals, thereby it transmits microwaves based on a plurality of frequencies within the frequency section corresponding to the type of the material to be measured, and determination of moisture content is achieved according to the microwave signal vector determined by the phase difference and the damping attenuation amount based on the microwave signals, thereby improving the accuracy of microwave moisture measurement.
In an example, when the moisture content of the material to be measured is determined according to the microwave signal vector of the microwave signal of each frequency, a specific example may include:
determining the included angle of the microwave signal vector of the microwave signal of each frequency;
constructing a vector matrix containing the included angle of each microwave signal vector;
and determining the water content of the material to be detected according to the vector matrix.
In a specific application example, the water content of the material to be measured may be determined according to the vector matrix and a preset determined regression coefficient matrix.
Based on the scheme in the present example, the following is a detailed illustration of the process of measuring moisture by microwave measurement in an application example.
As described above, when measuring moisture with microwaves, the moisture content of the material to be measured is calculated based on the microwave signal received by the receiving antenna and the microwave signal transmitted by the transmitting antenna. When microwave is used for measuring moisture, the dielectric property of moisture is mainly utilized, and the dielectric constant can be expressed as:
εr＝ε′r-j(ε″r+o’/ωε0)
wherein, ε 'r is dielectric loss, o'/ω ε 0 is conduction loss, and ω is in direct proportion to microwave frequency.
When at low frequencies, the conduction losses dominate, and the relationship between microwave attenuation and water content is not significant; at high frequencies, dielectric losses dominate, with a clear linear relationship between microwave attenuation and water content. Therefore, in order to determine the accuracy of the measured moisture content of the material under test, in this embodiment, a frequency band suitable for the material under test (i.e., a frequency band having a substantially linear relationship between microwave attenuation and moisture content) is selected for measurement.
In the embodiment, the type of the tested material is determined first, that is, the material type information is determined, and the material type information may be determined in any possible manner. In an embodiment, a user may send a material type selection instruction through a set selection switch, a touch screen, or the like, where the material type selection instruction includes material type information of a material to be measured, and the material type information is obtained by receiving the material type selection instruction in the embodiment. In some embodiments, the type of the material to be measured may also be automatically identified to obtain the material type information.
According to the scheme of the embodiment of the invention, after the material type information is obtained, the predetermined number of frequency information is extracted from the frequency interval corresponding to the material type information. The predetermined number here may be set in conjunction with actual needs, and may be set to 100, for example. The frequency range of the microwave signal is generally a wide frequency range. The frequency range in this example may be set to 500MHz to 10GHz, and for different types of materials, the frequency intervals in the frequency range corresponding to the materials (i.e., the material type information) may be the same or different.
Subsequently, the microwave transmitting antenna is controlled to sequentially transmit microwave signals of frequencies corresponding to the predetermined number of frequency information, that is, the microwave signals of 100 different frequencies are controlled to be transmitted, and the microwave signals of the 100 different frequencies can be sequentially transmitted within a predetermined time period. The predetermined time period may be set in conjunction with actual needs, and may be set to 10 milliseconds in one example.
The microwave signal of each frequency is transmitted out by the transmitting antenna, penetrates through the measured material on the non-metal conveyor belt and reaches the receiving antenna. After the microwave signal received by the receiving antenna is obtained, the phase difference and the damping attenuation of the microwave signal of the frequency can be determined according to the microwave signal received by the receiving antenna and the microwave signal received by the transmitting antenna. The specific manner of determining the phase difference and the damping attenuation amount may be performed in any possible manner.
The phase difference between the received and transmitted microwave signals at this frequency is regarded as a first vector, and the damping attenuation is regarded as a second vector. The first vector and the second vector are superposed to obtain the microwave signal vector of the microwave signal of the frequency.
By analyzing the microwave signal vector and representing the microwave signal vector as a vector in a coordinate system, the microwave signal vector can be determined to be a quantity which is not related to density change but related to moisture change, even if the density of the material changes, the angle of the microwave signal vector in the coordinate system can not change as long as the moisture content is constant, and the microwave signal vector is not related to the moisture content.
Taking the example of transmitting the microwave signals of 100 frequencies, 100 microwave signal vectors can be obtained for the transmitted microwave signals of 100 frequencies, after determining the included angle of the 100 signal vectors in the coordinate system, a vector matrix is constructed by using the included angle represented by the 100 signal vectors, and then, the water content of the material to be measured can be determined according to the vector matrix and a preset regression coefficient matrix.
In particular applications, the moisture content of the material being tested may be determined based on the following formula:
wherein C is the water content (%), b0Is the regression intercept (predetermined constant), biIs a regression coefficient matrix, Ai is the vector matrix, and n is a frequency number. For example, taking the above-mentioned example of transmitting a transmission signal of 100 frequencies, biAi are each a matrix of 1 row and 100 columns, and n is equal to 100.
The regression coefficient matrix may be predetermined and stored, and may be directly used when determining the moisture content. In a specific application example, b can be determined by establishing a calibration model and using a partial least squares algorithmi. The regression coefficient matrix may be determined in any possible manner based on the moisture content of a plurality of known samples.
Based on the same idea as the above method, fig. 3 shows a schematic structural diagram of a microwave moisture measuring device in an example, which includes, as shown in fig. 3:
the type determining module 301 is used for acquiring material type information;
a frequency information determining module 302, configured to extract a predetermined number of frequency information from a frequency interval corresponding to the material type information according to the material type information; the predetermined number may be set in conjunction with actual needs, and may be set to 100 in one example; the frequency interval in one example may be in the range 500MHz to 10 GHz;
a microwave irradiation control module 303, configured to control the microwave transmitting antenna to sequentially transmit microwave signals with frequencies corresponding to a predetermined number of frequency information, and obtain microwave signals received by the microwave receiving antenna; in one example, the microwave irradiation control module 303 may control the microwave transmitting antenna to sequentially transmit the microwave signals with the frequencies corresponding to the predetermined number of frequency information within a predetermined time period, where the predetermined time period may be set according to actual needs, for example, may be set to 10 milliseconds;
a vector determining module 304, configured to determine a phase difference and a damping attenuation amount of the microwave signal of each frequency received by the microwave receiving antenna relative to the microwave signal of each frequency transmitted by the microwave transmitting antenna; the phase difference of the microwave signals of each frequency is used as a first vector, the damping attenuation amount is used as a second vector, and the first vector and the second vector are superposed to respectively obtain microwave signal vectors of the microwave signals of each frequency;
and a water content determining module 305, configured to determine the water content of the material to be detected according to the microwave signal vector of the microwave signal of each frequency.
According to the aspect of the embodiment as described above, when performing microwave moisture measurement, based on the received material type selection command, frequency information is extracted from the frequency section corresponding to the material type information in the material type selection command, and a predetermined number of pieces of frequency information are extracted, and the microwave transmitting antenna is controlled to transmit microwave signals of frequencies corresponding to the extracted predetermined number of pieces of frequency information, thereby achieving measurement of moisture content based on the predetermined number of received microwave signals and the corresponding transmitted microwave signals, and when determining moisture content, the moisture content is determined based on the received microwave signals and a microwave signal vector determined by the transmitted microwave signals, thereby it transmits microwaves based on a plurality of frequencies within the frequency section corresponding to the type of the material to be measured, and determination of moisture content is achieved according to the microwave signal vector determined by the phase difference and the damping attenuation amount based on the microwave signals, thereby improving the accuracy of microwave moisture measurement.
The moisture content determination module 305 in one example includes:
the included angle determining module is used for determining the included angle of the microwave signal vector of the microwave signal of each frequency;
the matrix construction module is used for constructing a vector matrix containing the included angle of each microwave signal vector;
and the determining module is used for determining the water content of the material to be detected according to the vector matrix.
In a specific application example, the determining module may determine the water content of the material to be measured according to the vector matrix and a preset determined regression coefficient matrix.
It will be understood by those skilled in the art that all or part of the processes in the methods of the embodiments described above may be implemented by hardware related to instructions of a computer program, and the program may be stored in a non-volatile computer readable storage medium, and in the embodiments of the present invention, the program may be stored in a storage medium of a computer system and executed by at least one processor in the computer system, so as to implement the processes of the embodiments including the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Based on the examples described above, an embodiment also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the microwave moisture measurement method as described above.
Furthermore, in one embodiment, there is provided an apparatus, which may be in any possible form of the above-described evaluator, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, when executing the program, implementing the microwave moisture measurement method of any of the examples described above.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A microwave moisture measurement method is characterized by comprising the following steps:
acquiring material type information;
extracting a predetermined number of frequency information from a frequency interval corresponding to the material type information according to the material type information;
controlling a microwave transmitting antenna to sequentially transmit microwave signals with frequencies corresponding to the preset number of frequency information;
acquiring a microwave signal received by a microwave receiving antenna;
determining the phase difference and the damping attenuation quantity of the microwave signals of each frequency received by the microwave receiving antenna relative to the microwave signals of each frequency transmitted by the microwave transmitting antenna;
respectively obtaining microwave signal vectors of the microwave signals of all frequencies by superposing the first vector and the second vector by taking the phase difference of the microwave signals of all frequencies as the first vector and the damping attenuation amount as the second vector; the microwave signal vector is a quantity which is irrelevant to density change and relevant to moisture change, and when the density of the material to be detected is changed and the moisture content is constant, the angle of the microwave signal vector in a coordinate system cannot be changed;
and determining the water content of the material to be detected according to the microwave signal vector of the microwave signal of each frequency.
2. The microwave moisture measuring method according to claim 1, wherein the determining of the moisture content of the material to be measured according to the microwave signal vector of the microwave signal of each frequency comprises:
determining the included angle of the microwave signal vector of the microwave signal of each frequency;
constructing a vector matrix containing the included angle of each microwave signal vector;
and determining the water content of the material to be detected according to the vector matrix.
3. The microwave moisture measurement method according to claim 2, wherein the moisture content of the material to be measured is determined according to the vector matrix and a preset determined regression coefficient matrix.
4. A microwave moisture measurement method according to any of claims 1 to 3 comprising at least one of:
the predetermined number is 100;
the frequency interval is in the range of 500MHz to 10 GHz;
the microwave transmitting antenna sequentially transmits microwave signals of frequencies corresponding to a predetermined number of frequency information within a predetermined time period.
5. A microwave moisture measuring device, comprising:
the type determining module is used for acquiring material type information;
the frequency information determining module is used for extracting a preset number of frequency information from a frequency interval corresponding to the material type information according to the material type information;
the microwave irradiation control module is used for controlling the microwave transmitting antenna to sequentially transmit microwave signals with frequencies corresponding to the preset number of frequency information and acquiring the microwave signals received by the microwave receiving antenna;
the vector determination module is used for determining the phase difference and the damping attenuation of the microwave signals of the frequencies received by the microwave receiving antenna relative to the microwave signals of the frequencies transmitted by the microwave transmitting antenna; the phase difference of the microwave signals of each frequency is used as a first vector, the damping attenuation amount is used as a second vector, and the first vector and the second vector are superposed to respectively obtain microwave signal vectors of the microwave signals of each frequency; the microwave signal vector is a quantity which is irrelevant to density change and relevant to moisture change, and when the density of the material to be detected is changed and the moisture content is constant, the angle of the microwave signal vector in a coordinate system cannot be changed;
and the water content determining module is used for determining the water content of the material to be detected according to the microwave signal vector of the microwave signal of each frequency.
6. A microwave moisture measurement device according to claim 5 wherein the moisture content determination module comprises:
the included angle determining module is used for determining the included angle of the microwave signal vector of the microwave signal of each frequency;
the matrix construction module is used for constructing a vector matrix containing the included angle of each microwave signal vector;
and the determining module is used for determining the water content of the material to be detected according to the vector matrix.
7. The microwave moisture measuring device of claim 6, wherein the determining module determines the moisture content of the material to be measured according to the vector matrix and a predetermined regression coefficient matrix.
8. A microwave moisture measurement device according to any of claims 5 to 7 comprising at least one of:
the predetermined number is 100;
the frequency interval is in the range of 500MHz to 10 GHz;
and the microwave irradiation control module controls the microwave transmitting antenna to sequentially transmit microwave signals with frequencies corresponding to the preset number of frequency information within a preset time limit.
9. An apparatus comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1-4 when executing the computer program.
10. A computer storage medium on which a computer program is stored, characterized in that the computer program, when being executed by a processor, carries out the steps of the method of any of the preceding claims 1-4.
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| CN108169250B (en) * | 2018-03-01 | 2024-04-26 | 青岛恒拓环保科技有限公司 | Intelligent variable-frequency microwave moisture measuring instrument and measuring method |
| CN109884086B (en) * | 2019-03-26 | 2020-10-09 | 合肥鑫晟光电科技有限公司 | Method and device for detecting environment humidity |
| CN111311895A (en) * | 2020-02-10 | 2020-06-19 | 河海大学 | Microwave attenuation signal joint variable frequency acquisition system for road-level environment perception |
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| CN107219239A (en) | 2017-09-29 |
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