CN108333435B - Probe, dielectric tester and method, temperature measuring device and method, and microwave oven - Google Patents
Probe, dielectric tester and method, temperature measuring device and method, and microwave oven Download PDFInfo
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- CN108333435B CN108333435B CN201810107842.5A CN201810107842A CN108333435B CN 108333435 B CN108333435 B CN 108333435B CN 201810107842 A CN201810107842 A CN 201810107842A CN 108333435 B CN108333435 B CN 108333435B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
Abstract
The invention provides a probe, a dielectric tester and a method, a temperature measuring device and a method and a microwave oven, wherein the probe comprises the following components: a housing having a top, a sidewall and a bottom, the top being an open end, the sidewall being made of an electromagnetic wave shielding material, the bottom being made of a dielectric material; the first electrode is arranged in the shell, one end of the first electrode is fixed on the bottom, and the end face of the other end of the first electrode is lower than the end face of the top; the second electrode is arranged in the shell, one end of the first electrode is fixed on the bottom, the end face of the other end of the first electrode is lower than the end face of the top, two through holes are formed in the bottom, the first electrode and the second electrode respectively penetrate through the through holes to be fixedly connected with the bottom, and dielectric substances are filled between the first electrode and the second electrode. According to the technical scheme, when the measuring probe is used for measuring the dielectric constant of the food material in the microwave oven, the measuring probe is not interfered by electromagnetic waves, so that the measured dielectric constant of the food material is more accurate, the real-time temperature value of the food material can be determined by the dielectric constant of the food material measured by the measuring probe, and the measured temperature value has no temperature difference with the real-time temperature value.
Description
Technical Field
The invention relates to the technical field of microwave application, in particular to a measuring probe, a dielectric constant tester, a temperature measuring device, a dielectric constant testing method, a food material temperature measuring method and a microwave oven.
Background
At present, the test principle of the existing dielectric constant test device is to place a target object to be tested between two signal interfaces for transmitting radio frequency signals, and determine the dielectric constant of the target object to be tested by testing the attenuation of the intensity of the radio frequency signals. In addition, the temperature of the load (food material) in the cavity of the existing microwave oven is collected by an optical fiber temperature sensor, the basic principle is that the change of the temperature can cause the change of the reflection loss of an optical medium, and the current temperature value of the temperature is determined by measuring the loss of light. Because the temperature of the food material needs a heat transfer and a heat balance, especially in the heating process of the food material, the temperature value measured by the optical fiber temperature sensor has a temperature difference or time delay with the real-time real temperature, and the time delay is longer, probably several seconds, so that when the heating parameters of the microwave oven are adjusted, the real-time temperature detection can not be carried out, the phenomena of fire and the like easily occur to the heating of the microwave oven on the food material, and the heating efficiency is very low.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first object of the invention is to provide a measuring probe.
The second purpose of the invention is to provide a dielectric constant tester.
A third object of the present invention is to provide a temperature measuring device.
The fourth purpose of the invention is to provide a dielectric constant testing method.
The fifth purpose of the invention is to provide a food material temperature measuring method.
A sixth object of the present invention is to provide a microwave oven.
In order to achieve the above object, a first aspect of the present invention provides a measurement probe, including: a housing having a top, a sidewall and a bottom, the top being an open end, the sidewall being made of an electromagnetic wave shielding material, the bottom being made of a dielectric material; the first electrode is arranged in the shell, one end of the first electrode is fixed on the bottom, and the end face of the other end of the first electrode is lower than the end face of the top; the second electrode is arranged in the shell, one end of the first electrode is fixed on the bottom, the end face of the other end of the first electrode is lower than the end face of the top, two through holes are formed in the bottom, the first electrode and the second electrode respectively penetrate through the through holes to be fixedly connected with the bottom, and dielectric substances are filled between the first electrode and the second electrode.
According to the technical scheme, a first electrode and a second electrode are arranged in a shell of the measuring probe, and the top of the shell, one end of the first electrode close to the top and one end of the second electrode close to the top are in contact with a target together so as to test relevant parameters of the target. Because the lateral wall of casing comprises the electromagnetic wave shielding material, and the one end that first electrode is close to the top and the one end that the second electrode is close to the top all are less than the terminal surface of top, when measuring probe was arranged in the environment of electromagnetic wave, the radio frequency signal transmission between first electrode and the second electrode was not disturbed by the electromagnetic wave, and then made the data that the tester that has measuring probe surveyed more accurate. In addition, dielectric substances are filled between the first electrode and the second electrode of the shell, the bottom of the shell is made of dielectric materials, two through holes are formed in the bottom of the shell, one end of the first electrode and one end of the second electrode penetrate through the through holes and extend into the shell, the other ends of the first electrode and the second electrode are fixed to the bottom of the shell through the through holes, contact between the first electrode and the second electrode cannot occur, and the stability of the measuring probe during working is further improved. When the measuring probe is used for measuring the dielectric constant of the food material in the microwave oven, the radio frequency signal transmission between the first electrode and the second electrode in the measuring probe is not interfered by electromagnetic waves, so that the measured dielectric constant of the food material is more accurate, as the temperature value of the food material in the microwave oven is gradually increased along with the lapse of the operation time of the microwave oven, the real-time temperature value of the food material can be determined by the dielectric constant of the food material measured by the measuring probe, namely, the measured temperature value has no temperature difference with the real-time temperature value, the microwave oven can timely adjust the heating mode according to the temperature of the food material, and the heating efficiency of the microwave oven is further improved.
The dielectric material includes, but is not limited to, air, ceramic or polyvinyl chloride.
Wherein, it can be understood that the two through holes opened at the bottom are independent of each other and do not interfere with each other, so that the first electrode and the second electrode passing through the through holes are not in contact with each other.
In the above technical solution, further, the housing is a cylinder.
In the technical scheme, the shell is a cylinder, so that a user can conveniently hold the shell, and compared with a cylinder with the same volume and a non-cylinder, the shell of the cylinder is made of less materials, so that the manufacturing cost is further reduced.
In any of the above technical solutions, further, a relationship between the inner diameter D of the housing and the wavelength λ of the electromagnetic wave satisfies a relational expression:
in the technical scheme, because the inner diameter D of the shell is smaller than one tenth of the wavelength lambda of the electromagnetic wave, the electromagnetic wave outside the shell cannot enter the shell from the opening end, so that the radio-frequency signal transmission between the first electrode and the second electrode in the shell is not influenced by the electromagnetic wave outside the shell, and the accuracy of data measured by the tester with the measuring probe is further improved.
In any of the above technical solutions, further, the first electrode is parallel to the second electrode, and a height of the first electrode relative to the bottom is equal to a height of the second electrode relative to the bottom.
In the technical scheme, because the distances between the first electrode and the second electrode are equal and the heights are equal, if the first electrode and the second electrode are interfered by electromagnetic waves, interference signals simultaneously act on the first electrode and the second electrode, the influence degree of the interference signals on the signals of the first electrode is equal to the influence degree of the signals of the second electrode, and the influence degree difference is zero and is mutually offset, so that the radio frequency signal transmission mode of the tester with the measuring probe is converted from single-ended coaxial transmission to differential balanced transmission by the first electrode and the second electrode, and the accuracy of the test result of the tester with the measuring probe is further improved.
In any of the above technical solutions, further, the first electrode and the second electrode are both cylinders, and the diameter of the first electrode is equal to the diameter of the second electrode.
In the technical scheme, the first electrode and the second electrode are both cylinders, the diameter of the first electrode is equal to that of the second electrode, namely the shape and the size of the first electrode and the second electrode are equal, the influence degree of the microwave magnetic field interference signal on the differential signal of the first electrode is equal to that of the differential signal of the second electrode, the influence degree difference is zero and is offset, so that the anti-interference capability of the radio frequency signal transmission of the first electrode and the second electrode is strong, and the accuracy of the test result of the tester with the measuring probe is further improved. In addition, compared with other cylinders made of electrode materials with the same volume, the area of the end surfaces of the first electrode and the second electrode which are both cylinders is larger, so that the first electrode and the second electrode can be conveniently contacted with a target object.
In any of the above technical solutions, further, the height of the first electrode and the second electrode relative to the bottom is adjustable.
In the technical scheme, one end of the first electrode and one end of the second electrode are fixed with the bottom of the shell, so that the height of the first electrode and the height of the second electrode relative to the bottom are adjustable, namely the height difference of the other end of the first electrode and the other end of the second electrode relative to the end face of the top is adjustable.
The technical solution of the second aspect of the present invention provides a dielectric constant tester, comprising: any one of the measuring probes in the technical scheme of the first aspect; the electromagnetic wave shielding wire is a coaxial cable, the outer layer of the electromagnetic wave shielding wire is connected with the electromagnetic wave shielding layer of the measuring probe, the core layer of the electromagnetic wave shielding wire penetrates through the bottom of the measuring probe and is connected with the first electrode of the measuring probe, and the middle layer of the electromagnetic wave shielding wire penetrates through the bottom and is connected with the second electrode of the measuring probe; a master controller, comprising: the signal transmitting port is connected with one end of the electromagnetic wave shielding wire and used for transmitting a first radio frequency signal to the first electrode; and the signal receiving port is connected with one end of the electromagnetic wave shielding wire and is used for receiving a second radio frequency signal transmitted by the second electrode, wherein the main controller determines the dielectric constant according to the strength of the first radio frequency signal and the strength of the second radio frequency signal.
In this technical solution, the dielectric constant tester includes any one of the measurement probes in the technical solutions of the first aspect, and when the measurement probe is in an electromagnetic wave environment, a result measured by the dielectric constant tester is more accurate. The dielectric constant tester also comprises an electromagnetic wave shielding wire and a main controller, wherein the electromagnetic wave shielding wire is a coaxial cable, the outer layer of the electromagnetic wave shielding wire is connected with the electromagnetic wave shielding layer, the core layer of the electromagnetic wave shielding wire penetrates through the bottom to be connected with the first electrode, and the middle layer of the electromagnetic wave shielding wire penetrates through the bottom to be connected with the second electrode, so that the single-ended coaxial transmission of radio frequency signals on the electromagnetic wave shielding wire is converted into differential balanced transmission on the first electrode and the second electrode. The main controller comprises a signal sending port and a signal receiving port, wherein the signal sending port is connected with one end of the electromagnetic wave shielding wire and used for sending a first radio frequency signal to a first electrode of the measuring probe; the signal receiving port is connected with one end of the electromagnetic wave shielding wire and used for receiving a second radio frequency signal transmitted by a second electrode of the measuring probe, when the dielectric constant of a target object is tested, the first electrode and the second electrode of the measuring probe are contacted with the target object, the target object can weaken the intensity of the radio frequency signal, the intensity of the first radio frequency signal sent by the main controller through the first electrode is different from the intensity of the returned radio frequency signal of the second electrode necessarily, and the main controller can determine the dielectric constant according to the intensity of the first radio frequency signal and the intensity of the second radio frequency signal.
In any of the above technical solutions, further, the dielectric constant tester further includes: and one port of the filter is connected with the measuring probe through an electromagnetic wave shielding wire, and the other port of the filter is connected with the main controller.
In the technical scheme, the filter is used for filtering clutter received by the main controller, so that the test result of the dielectric constant tester is more accurate.
A third aspect of the present invention provides a temperature measuring device, including: the receiving unit is connected with any one of the dielectric constant testers in the technical scheme of the second aspect and is used for receiving the dielectric constant determined by the dielectric constant testers; and the determining unit is used for comparing the dielectric constant with a preset relation table of the dielectric constant and the temperature and determining a temperature value corresponding to the dielectric constant.
In this embodiment, the receiving unit of the temperature measuring device is connected to any one of the dielectric constant testers in the second embodiment to measure the dielectric constant of the target object. The dielectric constants of different targets at different temperatures are different, and the temperature value of the target can be deduced reversely according to the dielectric constant, so that the dielectric constant can be compared with a preset relation table of the dielectric constant and the temperature through a determination unit of the temperature measurement device, and the temperature value corresponding to the dielectric constant is determined. Therefore, the real-time test of the temperature value of the target object in the electromagnetic wave environment is realized, namely, the measured temperature value of the target object has no temperature difference with the real-time temperature value of the target object.
The technical solution of the fourth aspect of the present invention provides a dielectric constant testing method, which is used for any one of the dielectric constant testers in the technical solution of the second aspect, and includes: transmitting a first radio frequency signal to a target object in contact with a first electrode via the first electrode of a measurement probe of a permittivity tester; a second electrode of the measuring probe receives a second radio frequency signal reflected by the target object; according to the first radio frequency signal and the second radio frequency signal, the main controller determines the dielectric constant of the target object.
In the technical scheme, a first electrode and a second electrode of a measuring probe of a dielectric constant tester are contacted with a target, a first radio frequency signal is sent to the target contacted with the first electrode through the first electrode, after the first radio frequency signal is transmitted by the target, the intensity of the first radio frequency signal is reduced and changed into a second radio frequency signal due to the effect of the target on weakening an electric field, the second electrode receives the second radio frequency signal reflected by the target, and the main controller can determine the dielectric constant of the target according to the intensity of the first radio frequency signal and the intensity of the second radio frequency signal.
The technical solution of the fifth aspect of the present invention provides a food material temperature measuring method, which is used for a temperature measuring device in the technical solution of the third aspect, and includes: receiving the dielectric constant determined by the dielectric constant tester; and comparing the dielectric constant with a preset relation table of the dielectric constant and the temperature, and determining a temperature value corresponding to the dielectric constant.
In the technical scheme, when the target object is a food material, the dielectric constants of the food materials are different at different temperatures in the same environment, so that the temperature of the food material can be reversely deduced according to the dielectric constant of the food material. Firstly, the dielectric constant of the food material determined by a dielectric constant tester is received, and then the dielectric constant is compared with a preset relation table of the dielectric constant and the temperature, namely, a temperature value corresponding to the dielectric constant is determined. The temperature of the food material is determined by determining the dielectric constant of the food material, so that the function of testing the temperature of the food material in real time is realized, and the measured temperature of the food material and the temperature of the food material are not delayed.
A technical solution of a sixth aspect of the present invention provides a microwave oven, including: food material temperature measuring device in the third aspect technical scheme.
In the technical scheme, by adopting the food material temperature measuring device in the third aspect, the microwave oven can measure the temperature of the food material in real time, and the heating mode is adjusted in time according to the temperature of the food material, so that the heating efficiency of the microwave oven is further improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 shows a schematic structural diagram of a measurement probe according to one embodiment of the present invention;
FIG. 2 shows a cross-sectional view of the measurement probe of FIG. 1;
FIG. 3 shows a schematic structural diagram of a permittivity tester according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a temperature measurement device coupled to a dielectric constant tester, according to an embodiment of the present invention;
FIG. 5 shows a schematic flow diagram of a dielectric constant testing method according to an embodiment of the invention;
fig. 6 shows a flow chart of a food material temperature measuring method according to an embodiment of the invention;
fig. 7 is a schematic structural view illustrating a temperature measuring apparatus according to an embodiment of the present invention, when measuring a temperature of a food material in a microwave oven.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to fig. 4 and fig. 7 is:
1 cavity of microwave oven, 2 dielectric constant tester, 20 measuring probe, 202 shell, 2022 top, 2024 side wall, 2026 bottom, 204 first electrode, 206 second electrode, 30 electromagnetic wave shielding wire, 40 filter, 50 main controller, 60 food material, 3 temperature measuring device.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
The following describes a measurement probe, a dielectric constant tester, a temperature measurement device, a dielectric constant test method, a food material temperature measurement method, and a microwave oven according to an embodiment of the present invention with reference to fig. 1 to 7.
Example 1:
FIG. 1 shows a schematic structural diagram of a measurement probe 20 according to one embodiment of the present invention; fig. 2 shows a sectional view of the measuring probe 20 from fig. 1.
As shown in fig. 1 and 2, a measurement probe 20 according to an embodiment of the present invention includes: a housing 202, the housing 202 having a top 2022, a sidewall 2024 and a bottom 2026, the top 2022 being an open end, the sidewall 2024 being made of an electromagnetic wave shielding material, the bottom 2026 being made of a dielectric material; a first electrode 204 disposed in the housing 202, wherein one end of the first electrode 204 is fixed on the bottom portion 2026, and the end surface of the other end is lower than the end surface of the top portion 2022; the second electrode 206 is disposed in the housing 202, one end of the first electrode 204 is fixed on the bottom portion 2026, and an end surface of the other end is lower than an end surface of the top portion 2022, wherein the bottom portion is provided with two through holes, the first electrode 204 and the second electrode 206 respectively penetrate through the through holes to be fixedly connected with the bottom portion 2026, and a dielectric substance is filled between the first electrode 204 and the second electrode 206.
The first electrode 204 and the second electrode 206 are disposed in the casing 202 of the measurement probe 20, and the top portion 2022 of the casing 202, an end of the first electrode 204 close to the top portion 2022, and an end of the second electrode 206 close to the top portion 2022 are jointly contacted with the target object to test the relevant parameter of the target object. Because the sidewall 2024 of the casing 202 is made of an electromagnetic wave shielding material, and both the end of the first electrode 204 close to the top portion 2022 and the end of the second electrode 206 close to the top portion 2022 are lower than the end surface of the top portion 2022, when the measurement probe 20 is placed in an electromagnetic wave environment, the transmission of the radio frequency signal between the first electrode 204 and the second electrode 206 is not interfered by electromagnetic waves, so that the data measured by the tester having the measurement probe 20 is more accurate. In addition, dielectric substances are filled between the first electrode 204 and the second electrode 206 of the casing 202, the bottom 2026 of the casing 202 is made of dielectric materials, two through holes are formed in the bottom 2026, one end of the first electrode 204 and one end of the second electrode 206 both penetrate through the through holes and extend into the casing 202, and the other ends of the first electrode 204 and the second electrode 206 are fixed on the bottom 2026 through the through holes, so that the first electrode 204 and the second electrode 206 are not in contact with each other, and the stability of the measuring probe 20 during operation is further improved. When the measuring probe 20 is used for measuring the dielectric constant of the food material in the microwave oven, the transmission of radio frequency signals between the first electrode 204 and the second electrode 206 in the measuring probe 20 is not interfered by electromagnetic waves, so that the measured dielectric constant of the food material is more accurate.
It should be noted that the material of the dielectric substance includes, but is not limited to, air, ceramic or polyvinyl chloride material, and the dielectric substance in this embodiment is air.
Here, it is understood that the two through holes formed in the bottom portion 2026 are independent of each other and do not interfere with each other, so that the first electrode 204 and the second electrode 206 passing therethrough are not in contact with each other.
Further, as shown in fig. 1, the housing 202 is a cylinder for easy handling by a user, and the cylinder 202 of the same volume uses less material than a non-cylinder, further reducing the manufacturing cost.
Further, by setting the inner diameter D of the housing 202 to be less than one tenth of the wavelength λ of the electromagnetic wave, the electromagnetic wave outside the housing 202 cannot enter the housing 202 from the open end, so that the transmission of the radio frequency signal between the first electrode 204 and the second electrode 206 inside the housing 202 is not affected by the electromagnetic wave outside the housing 202, and the accuracy of the data measured by the tester with the measurement probe 20 is further improved.
In this embodiment, as shown in fig. 1 and fig. 2, the first electrode 204 is parallel to the second electrode 206, and the height of the first electrode 204 relative to the bottom 2026 is equal to the height of the second electrode 206 relative to the bottom 2026; the first electrode 204 and the second electrode 206 are both cylinders, and the diameter of the first electrode 204 is equal to the diameter of the second electrode 206.
Since the first electrode 204 and the second electrode 206 have the same distance and height, and the first electrode 204 and the second electrode 206 are both cylinders, the diameter of the first electrode 204 is the same as that of the second electrode 206, i.e., the first electrode 204 and the second electrode 206 are uniformly positioned with respect to the housing 202, and are equal in shape and size, therefore, if the first electrode 204 and the second electrode 206 are interfered by the electromagnetic wave, the interference signal acts on the first electrode 204 and the second electrode 206 simultaneously, the interference signal affects the signal of the first electrode 204 to the same extent as the signal of the second electrode 206, the difference between the degrees of influence is zero, and the interference signal and the signal of the first electrode 204 cancel each other, therefore, the first electrode 204 and the second electrode 206 change the transmission mode of the radio frequency signal of the tester with the measurement probe 20 from single-ended coaxial transmission to differential balanced transmission, thereby further improving the accuracy of the test result of the tester with the measurement probe 20. In addition, compared with other shapes of cylinders made of the same volume of electrode material, the area of the end surfaces of the first electrode 204 and the second electrode 206 is larger, so that the first electrode and the second electrode are convenient to contact with the target.
It should be noted that the distance d between the first electrode 204 and the second electrode 206 can be adjusted according to the testing requirement.
Further, the heights of the first electrode 204 and the second electrode 206 relative to the bottom 2026 are adjustable.
Since one end of the first electrode 204 and the second electrode 206 is fixed to the bottom 2026 of the housing 202, the height of the first electrode 204 and the second electrode 206 relative to the bottom 2026 can be adjusted, that is, the height difference H between the other end of the first electrode 204 and the other end of the second electrode 206 relative to the end surface of the top 2022 can be adjusted according to the test requirement, when the measurement probe 20 is in contact with the target, by adjusting the heights of the first electrode 204 and the second electrode 206 relative to the bottom 2026, on one hand, the first electrode 204 and the second electrode 206 are in better contact with the food material, so that the test of the dielectric constant is more convenient, and on the other hand, the test performance of the measurement probe 20 can be debugged.
Example 2:
fig. 3 shows a schematic structural diagram of the dielectric constant tester 2 according to an embodiment of the present invention.
As shown in fig. 1 to 3, a dielectric constant tester 2 according to an embodiment of the present invention includes: the measurement probe 20 in the above embodiment; the electromagnetic wave shielding wire 30 is a coaxial cable, the outer layer of the electromagnetic wave shielding wire 30 is connected with the electromagnetic wave shielding layer of the measuring probe 20, the core layer of the electromagnetic wave shielding wire 30 passes through the bottom 2026 of the measuring probe 20 and is connected with the first electrode 204 of the measuring probe 20, and the middle layer of the electromagnetic wave shielding wire 30 passes through the bottom 2026 and is connected with the second electrode 206 of the measuring probe 20; a master controller 50, comprising: a signal transmitting port (not shown) connected to one end of the electromagnetic wave shielding wire 30 for transmitting a first radio frequency signal to the first electrode 204; and a signal receiving port (not shown) connected to one end of the electromagnetic wave shielding wire 30 for receiving a second rf signal transmitted by the second electrode 206, wherein the main controller 50 determines the dielectric constant according to the strength of the first rf signal and the strength of the second rf signal.
The permittivity tester 2 includes the measurement probe 20 of the above-described embodiment, and when the measurement probe 20 is in an electromagnetic wave environment, the permittivity tester 2 can measure more accurately. The permittivity tester 2 further includes an electromagnetic wave shielding wire 30 and a main controller 50, wherein the electromagnetic wave shielding wire 30 is a coaxial cable, an outer layer of the electromagnetic wave shielding wire 30 is connected to the electromagnetic wave shielding layer, a core layer of the electromagnetic wave shielding wire 30 passes through the bottom 2026 to be connected to the first electrode 204, and an intermediate layer of the electromagnetic wave shielding wire 30 passes through the bottom 2026 to be connected to the second electrode 206, so that single-ended coaxial transmission of radio frequency signals on the electromagnetic wave shielding wire 30 is converted into differential balanced transmission on the first electrode 204 and the second electrode 206. The main controller 50 includes a signal transmitting port and a signal receiving port, the signal transmitting port is connected to one end of the electromagnetic wave shielding wire 30, and is configured to transmit a first radio frequency signal to the first electrode 204 of the measurement probe 20; the signal receiving port is connected to one end of the electromagnetic wave shielding wire 30, and is configured to receive a second radio frequency signal transmitted by the second electrode 206 of the measurement probe 20, and when the dielectric constant of the target object is tested, the first electrode 204 and the second electrode 206 of the measurement probe 20 are in contact with the target object, because the target object weakens the intensity of the radio frequency signal, the intensity of the first radio frequency signal sent by the main controller 50 through the first electrode 204 is different from the intensity of the returned radio frequency signal of the second electrode 206, and the main controller 50 can determine the dielectric constant according to the intensity of the first radio frequency signal and the intensity of the second radio frequency signal.
Further, the dielectric constant tester 2 further includes: one port of the filter 40 is connected to the measurement probe 20 via the electromagnetic wave shield wire 30, and the other port is connected to the main controller 50.
The filter 40 is used to filter out noise received by the main controller 50, so that the test result of the dielectric constant tester 2 is more accurate.
Example 3:
fig. 4 shows a schematic diagram of the connection of the temperature measuring device 3 and the dielectric constant tester 2 according to one embodiment of the present invention.
As shown in fig. 4, the temperature measuring device 3 according to one embodiment of the present invention includes: a receiving unit (not shown in the figure) connected to the dielectric constant tester 2 in the above embodiment, for receiving the dielectric constant determined by the dielectric constant tester 2; and a determining unit (not shown in the figure) for comparing the dielectric constant with a preset relation table of the dielectric constant and the temperature, and determining a temperature value corresponding to the dielectric constant.
The receiving unit of the temperature measuring device 3 is connected to the dielectric constant tester 2 in the above embodiment to measure the dielectric constant of the target object. The dielectric constants of different targets at different temperatures are different, and the temperature value of the target can be deduced reversely according to the dielectric constant, so that the determination unit of the temperature measurement device 3 can compare the dielectric constant with a preset relation table of the dielectric constant and the temperature, and the temperature value corresponding to the dielectric constant is determined. Therefore, the real-time test of the temperature value of the target object in the electromagnetic wave environment is realized, namely, the measured temperature value of the target object has no temperature difference with the real-time temperature value of the target object.
Example 4:
FIG. 5 shows a flow diagram of a dielectric constant testing method according to an embodiment of the invention.
As shown in fig. 5, the dielectric constant testing method according to an embodiment of the present invention is applied to any one of the dielectric constant testers in the above embodiments, and includes: step S502, a first radio frequency signal is sent to a target object contacted with a first electrode through the first electrode of a measuring probe of a dielectric constant tester; step S504, a second electrode of the measuring probe receives a second radio frequency signal reflected by the target object; step S506, the main controller determines the dielectric constant of the target according to the first rf signal and the second rf signal.
The method comprises the steps that a first electrode and a second electrode of a measuring probe of a dielectric constant tester are in contact with a target object, a first radio frequency signal is sent to the target object in contact with the first electrode through the first electrode, after the first radio frequency signal is transmitted by the target object, the strength of the first radio frequency signal is reduced to be changed into a second radio frequency signal due to the fact that the target object weakens the effect of an electric field, the second electrode receives a second radio frequency signal reflected by the target object, and the main controller can determine the dielectric constant of the target object according to the strength of the first radio frequency signal and the strength of the second radio frequency signal.
Example 5:
fig. 6 shows a flow chart of a food material temperature measuring method according to an embodiment of the invention.
As shown in fig. 6, a food material temperature measuring method according to an embodiment of the present invention is applied to the temperature measuring device of the above embodiment, and includes: step S602, receiving the dielectric constant determined by the dielectric constant tester; step S604, comparing the dielectric constant with a preset relationship table of the dielectric constant and the temperature, and determining a temperature value corresponding to the dielectric constant.
When the target object is a food material, the dielectric constants of the food materials are different at different temperatures under the same environment, so that the temperature of the food material can be reversely deduced according to the dielectric constant of the food material. Firstly, the dielectric constant of the food material determined by a dielectric constant tester is received, and then the dielectric constant is compared with a preset relation table of the dielectric constant and the temperature, namely, a temperature value corresponding to the dielectric constant is determined. The temperature of the food material is determined by determining the dielectric constant of the food material, so that the function of testing the temperature of the food material in real time is realized, and the measured temperature of the food material and the temperature of the food material are not delayed.
Example 6:
fig. 7 shows a schematic structural diagram of the temperature measuring device 3 according to one embodiment of the present invention when measuring the temperature of the food material 60 in the microwave oven.
A microwave oven according to an embodiment of the present invention includes: the temperature measuring device 3 of the above embodiment.
By adopting the temperature measuring device 3 of the embodiment, the microwave oven can measure the temperature value of the food material 60 in real time, and the heating mode is adjusted in time according to the temperature of the food material 60, so that the heating efficiency of the microwave oven is further improved. In a specific use, as shown in fig. 1, 2 and 7, the measuring probe 20 of the dielectric constant tester 2 connected to the temperature measuring device 3 is disposed in the cavity 1 of the microwave oven, and the measuring probe 20 is inserted into the food material 60, so that the first electrode 204 and the second electrode 206 of the measuring probe 20 are in contact with the food material 60, thereby measuring the real-time dielectric constant and the temperature value when the food material 60 is heated.
The technical scheme of the invention is described in detail with reference to the accompanying drawings, and the invention provides a measuring probe, a dielectric constant tester, a temperature measuring device, a dielectric constant testing method, a food material temperature measuring method and a microwave oven.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the system or unit referred to must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A measurement probe, comprising:
a housing having a top, a sidewall and a bottom, the top being an open end, the sidewall being made of an electromagnetic wave shielding material, the bottom being made of a dielectric material;
the first electrode is arranged in the shell, one end of the first electrode is fixed on the bottom, and the end face of the other end of the first electrode is lower than the end face of the top;
a second electrode arranged in the shell, one end of the second electrode is fixed on the bottom, the end surface of the other end is lower than the end surface of the top,
the bottom is provided with two through holes, the first electrode and the second electrode respectively penetrate through the through holes to be fixedly connected with the bottom, and dielectric substances are filled between the first electrode and the second electrode;
the relation between the inner diameter D of the shell and the wavelength lambda of the electromagnetic wave satisfies the relational expression:
2. a measurement probe according to claim 1 wherein the housing is cylindrical.
3. The measurement probe according to claim 1, wherein the first electrode is parallel to the second electrode, and a height of the first electrode relative to the base is equal to a height of the second electrode relative to the base.
4. A measurement probe according to claim 3 wherein the first and second electrodes are both cylindrical and the diameter of the first electrode is the same as the diameter of the second electrode.
5. A measurement probe according to claim 3 wherein the height of the first and second electrodes relative to the base is adjustable.
6. A dielectric constant tester, comprising:
the measurement probe of any one of claims 1 to 5;
the electromagnetic wave shielding wire is a coaxial cable, the outer layer of the electromagnetic wave shielding wire is connected with the electromagnetic wave shielding layer of the measuring probe, the core layer of the electromagnetic wave shielding wire penetrates through the bottom of the measuring probe and is connected with the first electrode of the measuring probe, and the middle layer of the electromagnetic wave shielding wire penetrates through the bottom of the measuring probe and is connected with the second electrode of the measuring probe;
a master controller, comprising:
a signal transmitting port connected to one end of the electromagnetic wave shielding wire, for transmitting a first radio frequency signal to the first electrode;
a signal receiving port connected with one end of the electromagnetic wave shielding wire and used for receiving a second radio frequency signal transmitted by the second electrode,
wherein the main controller determines the dielectric constant according to the intensity of the first radio frequency signal and the intensity of the second radio frequency signal.
7. The dielectric constant tester of claim 6, further comprising:
and one port of the filter is connected with the measuring probe through the electromagnetic wave shielding wire, and the other port of the filter is connected with the main controller.
8. A temperature measuring device comprising the dielectric constant tester as claimed in claim 6 or 7, characterized by further comprising:
the receiving unit is used for receiving the dielectric constant determined by the dielectric constant tester;
and the determining unit is used for comparing the dielectric constant with a preset relation table of the dielectric constant and the temperature and determining a temperature value corresponding to the dielectric constant.
9. A dielectric constant test method for the dielectric constant tester according to claim 6 or 7, comprising:
transmitting a first radio frequency signal to a target via a first electrode of a measurement probe of the permittivity tester;
a second electrode of the measuring probe receives a second radio frequency signal reflected by the target object;
and determining the dielectric constant of the target object by the main controller according to the strength of the first radio frequency signal and the strength of the second radio frequency signal.
10. A method of measuring a temperature of a food material, for use in the temperature measuring apparatus of claim 8, comprising:
receiving the dielectric constant determined by the dielectric constant tester;
and comparing the dielectric constant with a preset relation table of the dielectric constant and the temperature, and determining a temperature value corresponding to the dielectric constant.
11. A microwave oven characterized by comprising the temperature measuring device according to claim 8.
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