CN117761086A - Method for detecting moisture and impurities in tobacco raw material based on millimeter waves - Google Patents
Method for detecting moisture and impurities in tobacco raw material based on millimeter waves Download PDFInfo
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- CN117761086A CN117761086A CN202410092361.7A CN202410092361A CN117761086A CN 117761086 A CN117761086 A CN 117761086A CN 202410092361 A CN202410092361 A CN 202410092361A CN 117761086 A CN117761086 A CN 117761086A
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- 241000208125 Nicotiana Species 0.000 title claims abstract description 55
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 55
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Abstract
The invention discloses a method for detecting moisture and impurities in a tobacco raw material based on millimeter waves, which comprises the following steps: the method comprises the steps of establishing a tobacco raw material detection system, providing high-resolution position pulses for driving a conveyor belt mechanism to move by a mechanical motion control subsystem by a data acquisition control subsystem, counting by the data acquisition control subsystem, placing the tobacco raw material of a tested article on the conveyor belt mechanism, moving along a specified direction, and completing two-dimensional echo data acquisition in the direction of antenna beam pointing and antenna array arrangement direction by a radar detection system after an infrared triggering sensor is shielded by the tobacco raw material of the tested article. The invention belongs to the technical field of detection of moisture and impurities in tobacco raw materials, and particularly relates to a millimeter wave-based detection method of the moisture and the impurities in the tobacco raw materials.
Description
Technical Field
The invention belongs to the technical field of detection of moisture and impurities in tobacco raw materials, and particularly relates to a millimeter wave-based detection method of the moisture and the impurities in the tobacco raw materials.
Background
The moisture content and the detection of impurities such as tobacco stems and wood stems are required to be completed when tobacco leaves are purchased, so that the two indexes are ensured to be in a reasonable interval, and the moisture content is required to be controlled at the processing, storage and other stages of the tobacco leaves, and particularly in threshing and redrying enterprises, the measurement of the moisture content is an important index for evaluating whether the tobacco is qualified after the tobacco baking is finished, so that the detection of the moisture content and the impurities in tobacco raw materials is very important. The invention mainly solves the problem of rapid detection of the water content and impurities in the whole package of tobacco when tobacco companies purchase tobacco in large quantities. The method has the advantages of high identification precision, full coverage impurity types, accurate impurity measurement size, accurate impurity positioning position, high moisture content measurement precision, high detection efficiency and the like.
The traditional method for detecting the moisture content of the tobacco raw material by adopting a microwave technology adopts single-point frequency signals, and utilizes a working mode of microwave transmission to cooperate with mechanical scanning to finish the measurement of the moisture in the tobacco. Aiming at the defects of the traditional microwave detection method, the invention provides a method for detecting the moisture content and impurities in real time based on a millimeter wave linear frequency modulation system. Real-time two-dimensional electric scanning detection of the millimeter wave antenna array in the radar beam direction and the height direction is utilized, three-dimensional detection of equidistant positions in the transmission direction is completed by matching with high-precision position information provided by a transmission mechanism, thereby realizing high-speed echo signal acquisition of the measured object, completing three-dimensional imaging of the measured object based on a synthetic aperture three-dimensional imaging algorithm, rapidly detecting impurities in the measured object, and realizing omnibearing water content measurement based on analysis of echo data.
Currently, the measurement of moisture content in tobacco raw materials is based on moisture-related physical quantities, such as conductivity, dielectric constant, etc., to indirectly reflect the moisture content of a substance, such as: infrared measurement, capacitance, microwave. The infrared measurement method utilizes the characteristic that the spectral intensity can change along with the water content of a substance, and achieves the purpose of measuring the water content through later measurement and calibration. The capacitance method changes the capacitance value by changing the dielectric medium between the two electrode plates, then reflects the change of the electric signal, and has the advantages of real-time online measurement and higher measurement precision by calibrating the functional relation between the moisture content and the dielectric constant of the substance, but the surface of an object must be flush, the thickness is between 2cm and 3cm, and the measurement equipment is worn when the capacitance method is frequently used. The microwave method utilizes the phenomenon that microwaves polarize water molecules, so that the polarization of the water molecules consumes a large amount of microwave energy, and the change of the water content can be obtained by measuring the consumed energy. The dielectric constant of water is much higher than other values at a particular frequency of the microwaves, and changes in the dielectric constant can truly reflect changes in the moisture content. The method is little affected by environment, has high measurement precision, has less damage to the probe by non-contact measurement, can work for a long time, and is not affected by the size change of material particles, whether the surface is flat or not, and the like. For the measurement of the water content, the microwave method has a development prospect, and no relevant report on the research of the detection technology of the impurities in the tobacco exists at home and abroad at present.
Therefore, the invention provides a method for detecting moisture and impurities in a millimeter wave-based tobacco raw material.
Disclosure of Invention
The invention provides a millimeter wave-based detection method for moisture and impurities in tobacco raw materials, which aims to solve the technical problems that a tobacco company can quickly detect the moisture content and impurities in the whole package of tobacco when buying a large amount of tobacco, and can quickly identify and position the impurities in the tobacco raw materials and quickly measure the moisture content of the paper package through a set of system.
In order to realize the functions, the technical scheme adopted by the invention is as follows: a method for detecting moisture and impurities in a tobacco raw material based on millimeter waves comprises the following steps:
the method comprises the steps of firstly, establishing a tobacco raw material detection system, wherein the tobacco raw material detection system consists of a millimeter wave antenna array subsystem, a millimeter wave signal source subsystem, a data acquisition control subsystem, a mechanical motion control subsystem and a three-dimensional imaging and display control subsystem, and the radar detection system consists of the millimeter wave antenna array subsystem, the millimeter wave signal source subsystem and the data acquisition control subsystem;
the mechanical motion control subsystem provides high-resolution position pulses for the data acquisition control subsystem to drive the conveyor belt mechanism to move, and the data acquisition control subsystem counts the position pulses;
thirdly, after the tobacco raw material of the tested article is placed at one end of the conveyor belt mechanism, the tested article moves along the appointed direction by the driving of the conveyor belt mechanism, and when the infrared trigger sensor is shielded by the tobacco raw material of the tested article, the radar detection system completes the two-dimensional echo data acquisition of the antenna beam direction and the antenna array arrangement direction;
fourthly, arranging sampling positions 1 to N on a driving belt mechanism from left to right, and conveying a radar working position from the leftmost sampling position 1 to the rightmost position N to finish three-dimensional space scanning of tobacco raw materials;
in the scanning process, the data acquisition control subsystem carries out correlation processing on the acquired echo data and then returns the acquired echo data to the three-dimensional imaging and display control subsystem according to a certain rule, and the three-dimensional imaging and display control subsystem completes the synthetic aperture three-dimensional imaging of the echo signals and identifies and analyzes imaging results;
and (six) the calibration plate provides echo measurement signals for moisture measurement and amplitude and phase calibration of the multiple channels of the millimeter wave antenna array system.
Further, the antenna array subsystem in the step (one) is formed by splicing a plurality of antenna array modules, each antenna array module is formed by a switch combination and a receiving and transmitting antenna radiation unit, the millimeter wave signal source subsystem is responsible for generating broadband linear frequency modulation signals and receiving down-conversion processing of echo signals, the data acquisition control subsystem is responsible for controlling the signals of the millimeter wave signal source to generate broadband linear frequency modulation signals, meanwhile, is responsible for controlling the switching of different receiving and transmitting channels of the antenna array subsystem, is responsible for receiving position pulses of the mechanical motion scanning subsystem, is responsible for acquiring echo data and uploading the processed data to the three-dimensional imaging and display control terminal subsystem, and the mechanical motion control subsystem is responsible for driving the conveying belt mechanism to uniformly move along the appointed direction.
Further, the radar detection system in the step (one) is arranged at a single-side position of the conveyor mechanism.
Further, the sampling positions 1 to N in the step (four) are arranged at equal intervals.
Further, the calibration plate in the step (six) is a metal plate with a flat surface.
The invention adopts the structure to obtain the beneficial effects as follows: the method for detecting the moisture and the impurities in the tobacco raw material based on the millimeter waves not only can realize three-dimensional imaging of the impurities in the tobacco raw material, but also can realize measurement of the moisture content in the tobacco based on the amplitude and the phase of the broadband echo signal. Compared with single-point frequency measurement of moisture, the broadband signal measurement has higher measurement accuracy. The invention is based on radar transmission and reflection characteristic principles of millimeter wave frequency band broadband linear frequency modulation signals to different targets, and through high-speed linear frequency modulation signal generation and high-speed switching of antenna array receiving and transmitting channels, high-speed electric scanning in two-dimensional directions (beam pointing and antenna array receiving and transmitting channel arrangement directions) is completed, and simultaneously, one-dimensional mechanical movement and position information real-time feedback are matched, so that quick mechanical scanning of the moving direction of a conveying mechanism is completed, and further, quick three-dimensional space scanning of tobacco raw materials can be completed within 2-3 seconds, three-dimensional space reconstruction and echo amplitude-phase comparison of target three-dimensional echo data of the tobacco raw materials are completed, three-dimensional imaging of targets in paper bags and quick measurement of moisture content are completed, and the technical problems of quick identification and quick measurement of impurity and paper bag moisture content in the tobacco raw materials are simultaneously realized through a set of system. .
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FIG. 1 is a schematic diagram of a system flow of a method for detecting moisture and impurities in millimeter wave based tobacco raw materials according to the present invention;
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention discloses a method for detecting moisture and impurities in a tobacco raw material based on millimeter waves, which comprises the following steps:
the method comprises the steps of firstly, establishing a tobacco raw material detection system, wherein the tobacco raw material detection system consists of a millimeter wave antenna array subsystem, a millimeter wave signal source subsystem, a data acquisition control subsystem, a mechanical motion control subsystem and a three-dimensional imaging and display control subsystem, and the radar detection system consists of the millimeter wave antenna array subsystem, the millimeter wave signal source subsystem and the data acquisition control subsystem;
the mechanical motion control subsystem provides high-resolution position pulses for the data acquisition control subsystem to drive the conveyor belt mechanism to move, and the data acquisition control subsystem counts the position pulses;
thirdly, after the tobacco raw material of the tested article is placed at one end of the conveyor belt mechanism, the tested article moves along the appointed direction by the driving of the conveyor belt mechanism, and when the infrared trigger sensor is shielded by the tobacco raw material of the tested article, the radar detection system completes the two-dimensional echo data acquisition of the antenna beam direction and the antenna array arrangement direction;
fourthly, arranging sampling positions 1 to N on a driving belt mechanism from left to right, and conveying a radar working position from the leftmost sampling position 1 to the rightmost position N to finish three-dimensional space scanning of tobacco raw materials;
in the scanning process, the data acquisition control subsystem carries out correlation processing on the acquired echo data and then returns the acquired echo data to the three-dimensional imaging and display control subsystem according to a certain rule, and the three-dimensional imaging and display control subsystem completes the synthetic aperture three-dimensional imaging of the echo signals and identifies and analyzes imaging results;
and (six) the calibration plate provides echo measurement signals for moisture measurement and amplitude and phase calibration of the multiple channels of the millimeter wave antenna array system.
The antenna array subsystem in the step (one) is formed by splicing a plurality of antenna array modules, each antenna array module is formed by a switch combination and a receiving and transmitting antenna radiation unit, the millimeter wave signal source subsystem is responsible for generating broadband linear frequency modulation signals and receiving down-conversion processing of echo signals, the data acquisition control subsystem is responsible for controlling the generation of signals of the millimeter wave signal source, so that the broadband linear frequency modulation signals are generated, meanwhile, the data acquisition control subsystem is responsible for controlling the switching of different receiving and transmitting channels of the antenna array subsystem, receiving position pulses of the mechanical motion scanning subsystem, acquiring echo data and uploading the processed data to the three-dimensional imaging and display control terminal subsystem, the mechanical motion control subsystem is responsible for driving the conveying belt mechanism to uniformly move along a specified direction, and the radar detection system is arranged at a single side position of the conveying belt mechanism.
The sampling positions 1 to N in the step (four) are arranged at equal intervals.
The calibration plate in the step (six) adopts a metal plate with a flat surface.
The invention and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the invention as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.
Claims (5)
1. The method for detecting the moisture and the impurities in the tobacco raw material based on the millimeter waves is characterized by comprising the following steps of:
the method comprises the steps of firstly, establishing a tobacco raw material detection system, wherein the tobacco raw material detection system consists of a millimeter wave antenna array subsystem, a millimeter wave signal source subsystem, a data acquisition control subsystem, a mechanical motion control subsystem and a three-dimensional imaging and display control subsystem, and the radar detection system consists of the millimeter wave antenna array subsystem, the millimeter wave signal source subsystem and the data acquisition control subsystem;
the mechanical motion control subsystem provides high-resolution position pulses for the data acquisition control subsystem to drive the conveyor belt mechanism to move, and the data acquisition control subsystem counts the position pulses;
thirdly, after the tobacco raw material of the tested article is placed at one end of the conveyor belt mechanism, the tested article moves along the appointed direction by the driving of the conveyor belt mechanism, and when the infrared trigger sensor is shielded by the tobacco raw material of the tested article, the radar detection system completes the two-dimensional echo data acquisition of the antenna beam direction and the antenna array arrangement direction;
fourthly, arranging sampling positions 1 to N on a driving belt mechanism from left to right, and conveying a radar working position from the leftmost sampling position 1 to the rightmost position N to finish three-dimensional space scanning of tobacco raw materials;
in the scanning process, the data acquisition control subsystem carries out correlation processing on the acquired echo data and then returns the acquired echo data to the three-dimensional imaging and display control subsystem according to a certain rule, and the three-dimensional imaging and display control subsystem completes the synthetic aperture three-dimensional imaging of the echo signals and identifies and analyzes imaging results;
and (six) the calibration plate provides echo measurement signals for moisture measurement and amplitude and phase calibration of the multiple channels of the millimeter wave antenna array system.
2. The method for detecting moisture and impurities in the tobacco raw material based on millimeter waves according to claim 1, wherein the antenna array subsystem in the step (one) is formed by splicing a plurality of antenna array modules, each antenna array module is formed by a switch combination and a receiving and transmitting antenna radiation unit, the millimeter wave signal source subsystem is responsible for generating broadband chirp signals and receiving echo signals, the data acquisition control subsystem is responsible for controlling the generation of signals of the millimeter wave signal source, so that the millimeter wave signal source generates broadband chirp signals, meanwhile, is responsible for controlling the switching of different receiving and transmitting channels of the antenna array subsystem, is responsible for receiving position pulses of the mechanical motion scanning subsystem, is responsible for acquiring echo data and uploading the processed data to the three-dimensional imaging and display control terminal subsystem, and the mechanical motion control subsystem is responsible for driving the conveying belt mechanism to uniformly move along a designated direction.
3. The method of claim 1, wherein the radar detection system in step (one) is disposed at a single-sided location of the conveyor mechanism.
4. The method according to claim 1, wherein the sampling positions 1 to N in the step (four) are arranged at equal intervals.
5. The method of claim 1, wherein the calibration plate in step (six) is a flat-surfaced metal plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410092361.7A CN117761086A (en) | 2024-01-23 | 2024-01-23 | Method for detecting moisture and impurities in tobacco raw material based on millimeter waves |
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| CN202410092361.7A CN117761086A (en) | 2024-01-23 | 2024-01-23 | Method for detecting moisture and impurities in tobacco raw material based on millimeter waves |
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