Substance content detection device and method

Abstract

The invention relates to the technical field of substance detection, and particularly provides a substance content detection device and method. The substance content detection device comprises an accommodating cavity, a microwave regulator, a microwave detector and a microwave resonant cavity arranged around the periphery of the accommodating cavity, the accommodating cavity is used for accommodating a to-be-detected object; the microwave detector is used for sending a microwave signal to the microwave resonant cavity and receiving and detecting a resonant signal in the microwave resonant cavity; wherein the resonance signal is used for detecting the substance content of the to-be-detected substance; the microwave regulator is partially arranged in the microwave resonant cavity; wherein the resonant frequency of the microwave resonant cavity is adjusted by adjusting the part, arranged in the microwave resonant cavity, of the microwave adjuster. According to the substance content detection device, the resonant frequency of the microwave resonant cavity can be adjusted by adjusting the part, arranged in the microwave resonant cavity, of the microwave adjuster, so that frequency shift caused by parameters such as conductivity is compensated, and the detection precision of the substance content is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of substance detection, and more particularly, to a device and method for detecting the content of a substance. Background Art

[0002] Based on the absorption characteristics of different substances to microwaves, the detection of the content of a substance can be achieved. For example, when microwaves pass through a sample containing moisture, the microwaves will experience corresponding attenuation according to the moisture content in the sample, causing regular changes in the resonant signal in the resonant cavity. By monitoring these changes, the moisture content in the sample can be measured.

[0003] However, the change in the resonant signal is not only affected by the content of the substance, but also by other parameters such as environmental temperature or impurity content. For example, for the detection of the moisture content of a sample, the change in the resonant signal in the resonant cavity is not only affected by the moisture content, but also by the conductivity of the sample, which results in a low accuracy of the final moisture content detection result. Summary of the Invention

[0004] In view of this, an object of the embodiments of the present application is to provide a device and method for detecting the content of a substance, so as to improve the accuracy of the detection of the content of a substance based on microwaves.

[0005] In a first aspect, an embodiment of the present application provides a device for detecting the content of a substance, the device for detecting the content of a substance including: a receiving cavity, a microwave regulator, a microwave detector, and a microwave resonant cavity provided around the periphery of the receiving cavity; the receiving cavity is used for receiving a substance to be measured; the microwave detector is used for sending a microwave signal to the microwave resonant cavity, receiving and detecting the resonant signal in the microwave resonant cavity; wherein, the resonant signal is used for detecting the content of the substance of the substance to be measured; the microwave regulator is partially disposed in the microwave resonant cavity; wherein, the resonant frequency of the microwave resonant cavity is adjusted by adjusting the part of the microwave regulator disposed in the microwave resonant cavity.

[0006] Optionally, in an embodiment of the present application, at least one tuning hole is opened on the microwave resonant cavity; the microwave regulator includes: at least one tuning device; the tuning device is fixed on the microwave resonant cavity, and the tuning part of the tuning device is inserted into the microwave resonant cavity through the tuning hole.

[0007] In the above implementation process, the microwave regulator may include at least one tuning device. Since the tuning part of the tuning device is inserted into the microwave resonator through the tuning hole, by adjusting the tuning part of the tuning device inserted into the microwave resonator through the tuning hole, the resonant frequency of the microwave resonator can be adjusted to compensate for the frequency shift caused by parameters such as conductivity.

[0008] Optionally, in the embodiments of the present application, the shape of the microwave resonator is cylindrical; the tuning device is fixed on the radial surface or the axial surface of the microwave resonator.

[0009] Optionally, in the embodiments of the present application, the number of the tuning devices is multiple; among them, a part of the multiple tuning devices is fixed on the radial surface, and the other part is fixed on the axial surface.

[0010] Optionally, in the embodiments of the present application, the tuning device includes: an adjusting member, a lead screw, and a nut adapted to the lead screw; the nut is fixed at the tuning hole of the microwave resonator; the adjusting member is fixed at one end of the lead screw inside the microwave resonator.

[0011] In the above implementation process, since the tuning device includes an adjusting member, a lead screw, and a nut adapted to the lead screw, and the nut is fixed at the tuning hole of the microwave resonator, by rotating the lead screw, the position of one end of the lead screw inside the microwave resonator can be changed, that is, the spatial position of the adjusting member fixed at one end of the lead screw inside the microwave resonator can be changed, thereby changing the internal electric field energy of the microwave resonator and realizing the adjustment of the resonant frequency of the microwave resonator.

[0012] Optionally, in the embodiments of the present application, the tuning device includes: a bearing, a connecting rod, and an adjusting fin; the outer ring of the bearing is fixed at the tuning hole of the microwave resonator; the inner ring of the bearing is fixedly connected to one end of the connecting rod; the other end of the connecting rod is disposed inside the microwave resonator and is fixedly connected to the adjusting fin.

[0013] In the above implementation process, since the tuning device includes a bearing, a connecting rod, and an adjusting fin, and the outer ring of the bearing is fixed at the tuning hole of the microwave resonator, and the inner ring of the bearing is fixedly connected to one end of the connecting rod; by rotating the inner ring of the bearing, the adjusting fin can be driven to rotate, so that the spatial position of the adjusting fin changes, thereby changing the internal electric field energy of the microwave resonator and realizing the adjustment of the resonant frequency of the microwave resonator.

[0014] In a second aspect, the embodiments of the present application provide a method for detecting the content of a substance. The method is applied to the substance content detection device according to any one of the above first aspects. The method includes: Adjust the part of the microwave regulator disposed in the microwave resonator according to the conductivity of the object to be measured accommodated in the accommodation cavity; Based on the microwave detector sending a microwave signal to the microwave resonator, receiving and detecting the resonance signal in the microwave resonator; wherein, the resonance signal is used to detect the substance content of the object to be measured.

[0015] In the above implementation process, adjusting the part of the microwave regulator disposed in the microwave resonator according to the conductivity of the object to be measured accommodated in the accommodation cavity can adjust the resonance frequency of the microwave resonator to compensate for the frequency shift caused by the parameter of conductivity, thereby improving the detection accuracy of the substance content.

[0016] Optionally, in the embodiment of the present application, the adjusting the part of the microwave regulator disposed in the microwave resonator according to the conductivity of the object to be measured accommodated in the accommodation cavity includes: adjusting the part of the microwave regulator disposed in the microwave resonator according to the first correspondence between conductivity and frequency shift, the second correspondence between the spatial position of the microwave regulator and frequency shift, and the conductivity of the object to be measured accommodated in the accommodation cavity.

[0017] Optionally, in the embodiment of the present application, the adjusting the part of the microwave regulator disposed in the microwave resonator according to the first correspondence between conductivity and frequency shift, the second correspondence between the spatial position of the microwave regulator and frequency shift, and the conductivity of the object to be measured accommodated in the accommodation cavity includes: determining the conductance frequency shift of the object to be measured according to the conductivity and the first correspondence; determining the position frequency shift of the microwave regulator based on the conductance frequency shift; determining the target spatial position of the microwave regulator according to the position frequency shift and the second correspondence; and adjusting the part of the microwave regulator disposed in the microwave resonator according to the target spatial position.

[0018] In the above implementation process, according to the conductivity of the object to be measured accommodated in the accommodation cavity and the first correspondence, the conductance frequency shift caused by the conductivity of the object to be measured can be determined; according to the conductance frequency shift, the position frequency shift of the microwave regulator required for compensation can be determined; according to the position frequency shift and the second correspondence, the target spatial position of the microwave regulator required for compensating the conductance frequency shift can be determined; and then the part of the microwave regulator disposed in the microwave resonator can be adjusted according to the target spatial position to achieve compensation for the conductance frequency shift.

[0019] Optionally, in the embodiments of the present application, the microwave regulator includes: at least one tuning device; the second correspondence includes: the correspondence between the spatial position of each tuning device and the frequency shift when the microwave resonator is in different operating modes; adjusting the part of the microwave regulator disposed in the microwave resonator according to the first correspondence between the conductivity and the frequency shift, the second correspondence between the spatial position of the microwave regulator and the frequency shift, and the conductivity of the object to be measured accommodated in the accommodation cavity, includes: determining the conductivity frequency shift of the object to be measured according to the conductivity and the first correspondence; determining the tuning device to be adjusted in the microwave regulator based on the operating mode of the microwave resonator; determining the tuning position frequency shift of the tuning device to be adjusted based on the conductivity frequency shift; determining the target tuning spatial position of the tuning device to be adjusted according to the correspondence between the spatial position and the frequency shift of the tuning device to be adjusted and the tuning position frequency shift; adjusting the part of the tuning device to be adjusted disposed in the microwave resonator according to the target tuning spatial position.

[0020] In the above implementation process, according to the correspondence between the spatial position of each tuning device and the frequency shift when the microwave resonator is in different operating modes and the operating mode of the microwave resonator, the tuning device to be adjusted that can compensate for the conductivity frequency shift can be determined; and according to the target tuning spatial position, the part of the tuning device to be adjusted disposed in the microwave resonator is adjusted to achieve compensation for the conductivity frequency shift.

[0021] The beneficial effects of the present application at least include: The substance content detection device includes: an accommodation cavity, a microwave regulator, a microwave detector, and a microwave resonator disposed around the periphery of the accommodation cavity; the accommodation cavity is used to accommodate the object to be measured; the microwave detector is used to send a microwave signal to the microwave resonator, receive and detect the resonant signal in the microwave resonator; wherein, the resonant signal is used to detect the substance content of the object to be measured; the microwave regulator is partially disposed in the microwave resonator; wherein, the resonant frequency of the microwave resonator is adjusted by adjusting the part of the microwave regulator disposed in the microwave resonator. The substance content detection device can adjust the resonant frequency of the microwave resonator by adjusting the part of the microwave regulator disposed in the microwave resonator to compensate for the frequency shift caused by parameters such as conductivity, thereby improving the detection accuracy of the substance content. Description of the Drawings

[0022] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments of the present application will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related accompanying drawings can also be obtained based on these accompanying drawings.

[0023] Figure 1 Structural schematic diagram of a substance content detection device provided by an embodiment of the present application; Figure 2 Structural schematic diagram of another substance content detection device provided by an embodiment of the present application; Figure 3 Structural schematic diagram of a tuning device provided by an embodiment of the present application; Figure 4 Structural schematic diagram of another tuning device provided by an embodiment of the present application; Figure 5 Schematic diagram of the frequency shift effect provided by an embodiment of the present application; Figure 6 Flow schematic diagram of a substance content detection method provided by an embodiment of the present application; Figure 7 Schematic diagram of the frequency shift adjustment effect provided by an embodiment of the present application; Figure 8 Schematic diagram of the detection error of the substance content provided by an embodiment of the present application.

[0024] Reference numerals: 10 - Substance content detection device; 11 - Accommodation cavity; 12 - Microwave regulator; 120 - Tuning device; 121 - Adjusting member; 122 - Lead screw; 123 - Nut; 1201 - Compression cap; 011 - First fixing hole; 012 - Screw rod through hole; 1202 - Knob; 021 - Screw rod head through hole; 1203 - Adjusting rod; 031 - Slide block; 032 - First threaded hole; 1204 - Screw rod; 041 - Screw rod head; 042 - Screw rod thread; 1205 - Metal casing; 051 - Screw rod groove; 052 - Second threaded hole; 053 - Guide rail; 054 - Limiting member; 055 - Second fixing hole; 13 - Microwave detector; 14 - Microwave resonator. Detailed implementation manners

[0025] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0026] Unless otherwise defined, 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 application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0027] In the description of the embodiments of this application, technical terms such as "first", "second", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0028] Please refer to Figure 1 the schematic structural diagram of a substance content detection device 10 provided by the embodiments of this application shown. The substance content detection device 10 includes: a receiving cavity 11, a microwave regulator 12, a microwave detector 13, and a microwave resonator 14 disposed around the periphery of the receiving cavity 11; The receiving cavity 11 is used to hold the object to be measured; The microwave detector 13 is used to send a microwave signal to the microwave resonator 14, receive and detect the resonant signal in the microwave resonator 14; wherein, the resonant signal is used to detect the substance content of the object to be measured; The microwave regulator 12 is partially disposed in the microwave resonator 14; wherein, the resonant frequency of the microwave resonator 14 is adjusted by adjusting the part of the microwave regulator 12 disposed in the microwave resonator 14.

[0029] Among them, the substance content detection device 10 can be used to detect the moisture content, biomolecule content (such as protein, DNA concentration) in the analyte, and the filler ratio in the composite material, etc. The analyte can be in a fixed, liquid or gaseous state. The substance content detection device 10 can be used to realize the substance content detection in multiple fields such as biochemistry, biopharmaceutics, fine chemicals, grains, food, tobacco, brewing, electric power or aviation. This application does not make specific limitations on this. Taking the substance content detection device 10 used to detect the moisture content in petroleum (which can be crude oil, refined oil or tar) as an example: Specifically, the substance content detection device 10 can be connected to the production pipe of the crude oil wellhead, the pipeline of the crude oil transfer station, the pipeline for inter-factory handover, the pipeline for external transportation of crude oil in the pump house, the input pipeline of the refinery, the pipeline for loading and unloading oil in the tanker, the pipeline for transporting refined oil or the pipeline of the shipborne canned terminal, and make the oil body transported in the pipeline flow through the accommodation cavity 11, then the moisture content detection of the oil body transported in the corresponding pipeline can be realized based on the substance content detection device 10. The moisture content detection in the three-phase separation process flow of the crude oil gathering station can also be realized based on the substance content detection device 10; the measurement of the moisture content of tar; or the detection of the ultra-low moisture content of transformer oil and aviation kerosene fuel. The accommodation cavity 11 can be made of wave-transparent materials, such as polycarbonate, polyvinyl chloride, plexiglass or ceramic materials, etc. The analyte can be grains, soil, composite materials, fertilizers or crude oil, etc. The shape, size, etc. of the accommodation cavity 11 can be adjusted according to the actual application situation. Taking the measurement of the moisture content in crude oil as an example, the accommodation cavity 11 can be a cylindrical cavity with openings on both axial sides, and the size of the openings is the same as that of the crude oil transportation pipeline. The microwave detector 13 can include an excitation unit, a transmitting antenna, a receiving antenna, and a receiving unit, etc. The excitation unit is used to output a microwave signal with a certain power and frequency to drive the transmitting antenna. The transmitting antenna is used to receive the microwave signal from the excitation unit, amplify and modulate its power, etc., and then transmit the microwave signal into the microwave resonant cavity 14 in a certain direction and manner. The receiving antenna is used to receive the microwave signal in the microwave resonant cavity 14. The receiving unit is used to convert the microwave signal received by the receiving antenna into a resonant signal to detect the substance content of the analyte based on the resonant signal. The transmitting antenna and the receiving antenna can be inserted into the microwave resonant cavity 14 and are symmetrically distributed on both sides of the accommodation cavity 11. By adjusting the part of the microwave regulator 12 arranged in the microwave resonant cavity 14, the internal electric field energy of the microwave resonant cavity 14 can be changed, and then the resonant frequency can be changed.

[0030] Among them, taking the volume of the microwave regulator 12 inserted into the microwave resonant cavity 14 as an example, according to Maxwell's equations and the corresponding boundary conditions, the relative frequency shift formula can be determined: ; and respectively represent the resonant frequencies of the microwave resonant cavity 14 before and after being perturbed. represents the volume of the microwave resonant cavity 14, represents the volume change inside the microwave resonant cavity 14, and represent the relative dielectric constant and relative magnetic permeability of the medium in the microwave resonant cavity 14, respectively, and denote the electric and magnetic field strengths in the cavity before the perturbation, respectively. Indicates the absolute value sign, , They respectively represent the changes in magnetic energy storage and electrical energy storage caused by disturbances in the microwave resonant cavity 14, represents the magnetic energy storage in the microwave resonant cavity 14 before the perturbation, represents the electrical energy stored in the microwave resonant cavity 14 before the perturbation. Therefore, if the change in electric field energy caused by the volume change is greater than the change in magnetic field energy, that is, , the resonant frequency in the microwave resonant cavity 14 will decrease accordingly. The setting position of the microwave adjuster 12 can be adjusted according to the working mode of the microwave resonant cavity 14; for example, the microwave adjuster 12 can be set at a place where the electric field is strong. By adjusting the part of the microwave adjuster 12 set in the microwave resonant cavity 14, the resonant frequency of the microwave resonant cavity 14 can be adjusted.

[0031] It can be seen that the substance content detection device 10 provided in the embodiment of the present application includes a containing cavity 11, a microwave regulator 12, a microwave detector 13, and a microwave resonant cavity 14 arranged around the periphery of the containing cavity 11; the containing cavity 11 is used to contain the object to be measured; the microwave detector 13 is used to send microwave signals to the microwave resonant cavity 14, receive and detect the resonant signal in the microwave resonant cavity 14; wherein the above resonant signal is used to detect the substance content of the object to be measured; the microwave regulator 12 is partially arranged in the microwave resonant cavity 14; wherein the resonant frequency of the microwave resonant cavity 14 is adjusted by adjusting the part of the microwave regulator 12 arranged in the microwave resonant cavity 14. The substance content detection device 10 can adjust the resonant frequency of the microwave resonant cavity 14 by adjusting the part of the microwave regulator 12 arranged in the microwave resonant cavity 14 to compensate for the frequency shift caused by parameters such as conductivity, thereby improving the detection accuracy of the substance content.

[0032] Please refer to Figure 2 , Figure 2 A schematic structural diagram of another substance content detection device 10 provided in an embodiment of the present application.

[0033] In some alternative embodiments, at least one tuning hole is formed in the microwave resonator 14; the microwave regulator 12 includes: at least one tuning device 120; the tuning device 120 is fixed on the microwave resonator 14, and the tuning part of the tuning device 120 is inserted into the microwave resonator 14 through the above-mentioned tuning hole.

[0034] Wherein, the number of tuning holes can be 1, or 2, 6 or other reasonable numbers, and the present application does not make specific limitations thereto. The number of tuning devices 120 included in the microwave regulator 12 can be 1, or 2, 8 or other reasonable numbers. Since the microwave regulator 12 includes at least one tuning device 120, and the tuning part of the tuning device 120 is inserted into the microwave resonator 14 through the tuning hole, by adjusting the tuning part of the tuning device 120 inserted into the microwave resonator 14 through the tuning hole, the resonance frequency of the microwave resonator 14 can be adjusted to compensate for the frequency shift caused by parameters such as conductivity.

[0035] As Figure 2 shown, in some alternative embodiments, the shape of the microwave resonator 14 is cylindrical; the tuning device 120 is fixed on the radial surface or the axial surface of the microwave resonator 14.

[0036] In some alternative embodiments, the number of tuning devices 120 is multiple; wherein, a part of the multiple tuning devices 120 is fixed on the radial surface, and the other part is fixed on the axial surface.

[0037] Wherein, when the number of tuning devices 120 is 1, the tuning device 120 can be fixed on the radial surface of the microwave resonator 14, or can be fixed on the axial surface of the microwave resonator 14. When the number of tuning devices 120 is multiple, the multiple tuning devices 120 can all be fixed on the radial surface of the microwave resonator 14; they can also all be fixed on the axial surface of the microwave resonator 14; or a part can be fixed on the radial surface of the microwave resonator 14, and the other part can be fixed on the axial surface of the microwave resonator 14. Figure 2 Exemplarily, the case where the number of tuning devices 120 is 5, and 4 of the tuning devices 120 are fixed on the axial surface of the microwave resonator 14 and the other one is fixed on the radial surface of the microwave resonator 14 is shown.

[0038] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of a tuning device 120 provided by an embodiment of the present application.

[0039] In some alternative embodiments, the tuning device 120 includes: an adjusting member 121, a lead screw 122, and a nut 123 adapted to the lead screw 122; the nut 123 is fixed at the tuning hole of the microwave resonator 14; the adjusting member 121 is fixed at one end of the lead screw 122 inside the microwave resonator 14.

[0040] Among them, the adjusting member 121 can be of any shape, such as cylindrical, cubic or cuboid. The length of the lead screw 122 can be adjusted according to actual situations. Rotating the lead screw 122 will change the spatial position of the adjusting member 121 relative to the microwave resonator 14 (in this process, the volume of the adjusting member 121 inserted into the microwave resonator 14 may change). Since the tuning device 120 includes the adjusting member 121, the lead screw 122, and the nut 123 adapted to the lead screw 122, and the nut 123 is fixed at the tuning hole of the microwave resonator 14, by rotating the lead screw 122, the position of one end of the lead screw 122 inside the microwave resonator 14 can be changed, that is, the spatial position of the adjusting member 121 fixed at one end of the lead screw 122 inside the microwave resonator 14 can be changed, thereby changing the internal electric field energy of the microwave resonator 14 and realizing the adjustment of the resonant frequency of the microwave resonator 14.

[0041] In some alternative embodiments, the tuning device 120 includes: a bearing, a connecting rod, and an adjusting fin; the outer ring of the bearing is fixed at the tuning hole of the microwave resonator 14; the inner ring of the bearing is fixedly connected to one end of the connecting rod; the other end of the connecting rod is disposed inside the microwave resonator 14 and is fixedly connected to the adjusting fin.

[0042] Among them, the arrangement of the bearing and the connecting rod is similar to the structure of the tuning device 120 Figure 3 shown. During the rotation of the connecting rod, the volume of the adjusting fin inserted into the microwave resonator 14 remains unchanged; however, the spatial position of the adjusting fin relative to the microwave resonator 14 will change. By fixing the outer ring of the bearing at the tuning hole of the microwave resonator 14, fixedly connecting the inner ring of the bearing to one end of the connecting rod, and rotating the inner ring of the bearing, the adjusting fin can be driven to rotate. The spatial position of the adjusting fin is changed, thereby changing the internal electric field energy of the microwave resonator 14 and realizing the adjustment of the resonant frequency of the microwave resonator 14.

[0043] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of another tuning device 120 provided by the embodiment of the present application. Figure 4The installation steps of the tuning device 120 shown include: placing the screw 1204 into the metal housing 1205, supporting the screw 1204 by the screw groove 051, sleeving the compression cap 1201 onto the screw 1204 through the screw through-hole 012, passing screws through the first fixing holes 011 respectively, and connecting and fixing the compression cap 1201 to the metal housing 1205 through the second threaded hole 052, so that the screw 1204 can be rotatably restricted in the screw groove 051. Matching the adjusting rod 1203 with the screw thread 042 through the first threaded hole 032, and entering the metal housing 1205 through one side of the guide rail 053 inside the metal housing 1205 by the slider 031. When the adjusting rod 1203 is screwed out, due to the change in the force direction, the slider 031 will turn to the other side of the guide rail 053, and a limiting member 054 is provided on the other side of the guide rail 053, which can ensure that the slider 031 will not fall out of the metal housing 1205. The tuning device 120 can be fixed on the microwave resonator 14 through the second fixing hole 055. Fixing the knob 1202 outside the screw head 041 through the screw head through-hole 021, then by rotating the knob 1202, the volume of the adjusting rod 1203 extending into the microwave resonator 14 can be changed. By changing the volume or spatial position of the adjusting rod 1203 extending into the microwave resonator 14, the microwave energy in the microwave resonator 14 can be changed, and thus the adjustment of the cavity zero point can be achieved. Taking Figure 4 the structure of the tuning device 120 shown as an example, the insertion depth h of the adjusting rod 1203 can be changed and simulations can be carried out. The insertion volume x corresponding to different insertion depths h, and , where r represents the radius of the adjusting rod 1203. Based on the simulation results, the corresponding relationship between the insertion volume x (or insertion depth h) and the frequency shift y can be obtained. Furthermore, according to the corresponding relationship between the insertion volume x (or insertion depth h) and the frequency shift y, the spatial position of the adjusting rod 1203 (different spatial positions correspond to different insertion volumes x or insertion depths h) can be adjusted to adjust the resonant frequency of the microwave resonator 14 to compensate for the frequency shift caused by parameters such as conductivity.

[0044] Please refer to Figure 5 , Figure 5 which is a schematic diagram of the frequency shift effect provided by the embodiment of the present application. Figure 5 Specifically shown is: by changing Figure 4 the insertion depth h of the tuning device 120 shown, the resonant frequencies corresponding to different insertion depths h (0 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, and 8 mm respectively) measured. As Figure 4As shown, by changing the insertion depth h of the tuning device 120, the resonant frequency of the microwave resonator 14 can be adjusted. Among them, the initial insertion depth of the tuning device 120 can be 0 mm, or 4 mm or 6 mm. Exemplarily, when the initial insertion depth of the tuning device 120 is 6 mm, if the conductivity of the object to be measured affects the left shift of the resonant frequency of the microwave resonator 14, the insertion depth of the tuning device 120 can be reduced to make the resonant frequency of the microwave resonator 14 shift to the right to overcome the influence of conductivity on the resonant frequency, thereby improving the substance content detected based on the resonant signal. If the conductivity of the object to be measured affects the right shift of the resonant frequency of the microwave resonator 14, the insertion depth of the tuning device 120 can be increased to make the resonant frequency of the microwave resonator 14 shift to the left to overcome the influence of conductivity on the resonant frequency. The specific adjustment method for "the part of the microwave regulator 12 disposed in the microwave resonator 14" can be determined according to the reference value of conductivity, the conductivity of the object to be measured, the reference insertion depth of the tuning device 120, etc.

[0045] Please refer to Figure 6 , Figure 6 which is a schematic flowchart of a method for detecting the substance content provided by an embodiment of the present application. This method for detecting the substance content is applied to the substance content detection device described in any one of the above first aspects, and this method may include the following steps: S201. Adjust the part of the microwave regulator disposed in the microwave resonator according to the conductivity of the object to be measured accommodated in the accommodation cavity; S202. Based on the microwave detector sending a microwave signal to the microwave resonator, receive and detect the resonant signal in the microwave resonator; wherein, the resonant signal is used to detect the substance content of the object to be measured.

[0046] Among them, to avoid repetition, for the specific implementation manners of the above steps S201 and S202, reference can be made to the relevant descriptions of the substance content detection device 10 in the above text. The method for detecting the substance content provided by the embodiment of the present application can adjust the part of the microwave regulator 12 disposed in the microwave resonator 14 according to the conductivity of the object to be measured accommodated in the accommodation cavity 11, so as to adjust the resonant frequency of the microwave resonator 14 to compensate for the frequency shift caused by the parameter of conductivity, thereby improving the detection accuracy of the substance content.

[0047] Among them, taking the measurement of the moisture content as an example, by adjusting the part of the microwave regulator 12 disposed in the microwave resonator 14, the resonant frequencies under the same moisture content but different conductivities can be adjusted to the same frequency point. Please refer to Figure 7 , Figure 7 which is a schematic diagram of the frequency shift adjustment effect provided by an embodiment of the present application. Figure 7 The upper diagram in shows the schematic diagram of the S21 curve before tuning (that is, when the microwave resonator is not tuned).Figure 7 The following figure in Figure 7 shows a schematic diagram of the S21 curve after tuning (that is, after "adjusting the part of the microwave regulator disposed in the microwave resonant cavity according to the conductivity of the analyte contained in the accommodation cavity"). As Figure 7 shown, based on the substance content detection device 10 provided in the present application, the resonant frequency under the same moisture content but different conductivities can be adjusted to the same frequency point by adjusting the part of the microwave regulator 12 disposed in the microwave resonant cavity 14, thereby reducing the moisture content measurement error. Figure 7 shows a schematic diagram of the frequency shift adjustment effect when the salinity is 100 ppm as the adjustment reference. It should be noted that the conductivities of the samples corresponding to different salinities are different. Exemplarily, Figure 8 5 kppm in Figure 8 represents 5000 ppm. Figure 8 This is a schematic diagram of the detection error of the substance content provided by the embodiment of the present application.

[0048] Specifically, it shows the moisture content detection error before and after tuning (the triangle represents before tuning, and the circle represents after tuning). As

[0049] shown, before tuning, the moisture content fitting error is 1.1‰; after tuning, the moisture content detection error can be reduced to 0.5‰.

[0050] In some alternative embodiments, adjusting the part of the microwave regulator disposed in the microwave resonator according to the first correspondence between the conductivity and the frequency shift, the second correspondence between the spatial position of the microwave regulator and the frequency shift, and the conductivity of the object to be measured accommodated in the accommodation cavity includes: determining the conductivity frequency shift of the object to be measured according to the conductivity and the first correspondence; determining the position frequency shift of the microwave regulator based on the conductivity frequency shift; determining the target spatial position of the microwave regulator according to the position frequency shift and the second correspondence; and adjusting the part of the microwave regulator disposed in the microwave resonator according to the target spatial position.

[0051] Among them, the conductivity frequency shift refers to the influence of the conductivity of the object to be measured on the resonance frequency of the microwave resonator 14, and the position frequency shift refers to the influence of the spatial position of the microwave regulator 12 on the resonance frequency of the microwave resonator 14. According to the conductivity of the object to be measured accommodated in the accommodation cavity 11 and the first correspondence, the conductivity frequency shift caused by the conductivity of the object to be measured can be determined; according to the conductivity frequency shift, the position frequency shift of the microwave regulator 12 required for compensation can be determined; according to the position frequency shift and the second correspondence, the target spatial position of the microwave regulator 12 required for compensating the conductivity frequency shift can be determined; and then, the part of the microwave regulator 12 disposed in the microwave resonator 14 can be adjusted according to the target spatial position to achieve compensation for the conductivity frequency shift.

[0052] In some alternative embodiments, the microwave regulator includes: at least one tuning device; the second correspondence includes: the correspondence between the spatial position of each tuning device and the frequency shift when the microwave resonator is in different working modes; adjusting the part of the microwave regulator disposed in the microwave resonator according to the first correspondence between the conductivity and the frequency shift, the second correspondence between the spatial position of the microwave regulator and the frequency shift, and the conductivity of the object to be measured accommodated in the accommodation cavity includes: determining the conductivity frequency shift of the object to be measured according to the conductivity and the first correspondence; determining the tuning device to be adjusted in the microwave regulator based on the working mode of the microwave resonator; determining the tuning position frequency shift of the tuning device to be adjusted based on the conductivity frequency shift; determining the target tuning spatial position of the tuning device to be adjusted according to the correspondence between the spatial position of the tuning device to be adjusted and the frequency shift and the tuning position frequency shift; and adjusting the part of the tuning device to be adjusted disposed in the microwave resonator according to the target tuning spatial position.

[0053] Among them, for the second corresponding relationship, specifically, each tuning device can be adjusted to different spatial positions, and according to the resonance frequency of the microwave resonator 14 when the tuning device is at different spatial positions, the corresponding relationship between the spatial position of each tuning device and the frequency shift can be fitted. It should be noted that during the process of determining the corresponding relationship between the spatial position and the frequency shift of any tuning device, the spatial positions of the remaining tuning devices need to be kept unchanged. The positions of the regions with stronger electric fields in different working modes are different. By adjusting the tuning devices arranged in the regions with stronger electric fields, the resonance frequency of the microwave resonator 14 can be changed more significantly. Therefore, according to the working mode of the microwave resonator 14 and the corresponding relationship between the spatial position of each tuning device and the frequency shift in the corresponding working mode, the tuning device to be adjusted that can compensate for the conductance frequency shift can be determined; and according to the target tuning spatial position, the part of the tuning device to be adjusted arranged in the microwave resonator 14 can be adjusted to achieve the compensation for the conductance frequency shift.

[0054] In several embodiments provided by the embodiments of the present application, it should be understood that the disclosed device / system and method can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the drawings show the possible architectures, functions, and operations of the devices, methods, and computer program products according to multiple embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0055] In addition, in each embodiment of the embodiments of the present application, the functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0056] The above description is only an optional implementation manner of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the embodiments of the present application, and all should be covered within the protection scope of the embodiments of the present application.

Claims

1. A device for detecting the content of a substance, characterized in that, The device includes: a receiving cavity, a microwave regulator, a microwave detector, and a microwave resonator disposed around the periphery of the receiving cavity; The receiving cavity is used to accommodate the object to be measured; The microwave detector is used to send a microwave signal to the microwave resonator, receive and detect the resonance signal in the microwave resonator; wherein, the resonance signal is used to detect the substance content of the object to be measured; The microwave regulator is partially disposed in the microwave resonator; wherein, the resonance frequency of the microwave resonator is adjusted by adjusting the portion of the microwave regulator disposed in the microwave resonator.

2. The device according to claim 1, characterized in that, At least one tuning hole is provided on the microwave resonator; the microwave regulator includes: at least one tuning device; The tuning device is fixed on the microwave resonator, and the tuning portion of the tuning device is inserted into the microwave resonator through the tuning hole.

3. The device according to claim 2, characterized in that, The shape of the microwave resonator is cylindrical; The tuning device is fixed on the radial surface or the axial surface of the microwave resonator.

4. The device according to claim 3, characterized in that, The number of the tuning devices is multiple; Wherein, a part of the multiple tuning devices is fixed on the radial surface, and the other part is fixed on the axial surface.

5. The device according to any one of claims 2 - 4, characterized in that, Wherein, The tuning device includes: an adjusting member, a lead screw, and a nut adapted to the lead screw; The nut is fixed at the tuning hole of the microwave resonator; The adjusting member is fixed at one end of the lead screw inside the microwave resonator.

6. The device according to any one of claims 2 - 4, characterized in that, Wherein, The tuning device includes: a bearing, a connecting rod, and an adjusting fin; The outer ring of the bearing is fixed at the tuning hole of the microwave resonator; The inner ring of the bearing is fixedly connected to one end of the connecting rod; The other end of the connecting rod is disposed inside the microwave resonator and is fixedly connected to the adjusting fin.

7. A method for detecting the content of a substance, characterized in that, The method is applied to the substance content detection device according to any one of claims 1-6, and the method includes: Adjusting the portion of the microwave regulator disposed in the microwave resonator according to the conductivity of the object to be measured accommodated in the receiving cavity; Based on the microwave detector sending a microwave signal to the microwave resonator, receiving and detecting the resonance signal in the microwave resonator; wherein, the resonance signal is used to detect the substance content of the object to be measured.

8. The method according to claim 7, characterized in that, The adjusting the portion of the microwave regulator disposed in the microwave resonator according to the conductivity of the object to be measured accommodated in the receiving cavity includes: Adjusting the portion of the microwave regulator disposed in the microwave resonator according to the first correspondence between conductivity and frequency shift, the second correspondence between the spatial position of the microwave regulator and frequency shift, and the conductivity of the object to be measured accommodated in the receiving cavity.

9. The method according to claim 8, characterized in that, The adjusting the portion of the microwave regulator disposed in the microwave resonator according to the first correspondence between conductivity and frequency shift, the second correspondence between the spatial position of the microwave regulator and frequency shift, and the conductivity of the object to be measured accommodated in the receiving cavity includes: Determining the conductivity frequency shift of the object to be measured according to the conductivity and the first correspondence; Determining the position frequency shift of the microwave regulator based on the conductivity frequency shift; Determining the target spatial position of the microwave regulator according to the position frequency shift and the second correspondence; Adjust the part of the microwave regulator disposed in the microwave resonator according to the target spatial position.

10. The method according to claim 9, characterized in that, Wherein, the microwave regulator includes: at least one tuning device; and the second correspondence includes: the correspondence between the spatial position of each tuning device and the frequency shift when the microwave resonator is in different operating modes; The adjusting the part of the microwave regulator disposed in the microwave resonator according to the first correspondence between the conductivity and the frequency shift, the second correspondence between the spatial position of the microwave regulator and the frequency shift, and the conductivity of the object to be measured accommodated in the accommodating cavity includes: Determine the conductivity frequency shift of the object to be measured according to the conductivity and the first correspondence; Determine the tuning device to be adjusted in the microwave regulator based on the operating mode of the microwave resonator; Determine the tuning position frequency shift of the tuning device to be adjusted based on the conductivity frequency shift; Determine the target tuning spatial position of the tuning device to be adjusted according to the correspondence between the spatial position and the frequency shift of the tuning device to be adjusted and the tuning position frequency shift; Adjust the part of the tuning device to be adjusted disposed in the microwave resonator according to the target tuning spatial position.

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