Humidity detection system, humidity detection device, humidity detection method and computer device based on time modulation

Abstract

The present application relates to a humidity detection system, humidity detection equipment, humidity detection method and computer equipment based on time modulation. The system includes an LC wireless passive sensor and a readout circuit, wherein the LC wireless passive sensor includes a sensitive capacitor and a sensor inductor, and the readout circuit includes a readout circuit inductor and a modulated time-varying capacitor. The capacitance value of the sensitive capacitor is correlated with the humidity of the environment to be measured; the two ends of the sensor inductor are connected to the sensitive capacitor; the readout circuit inductor is coupled to the sensor inductor; the modulated time-varying capacitor is connected to the two ends of the readout circuit inductor, and the capacitance value of the modulated time-varying capacitor changes periodically according to a preset modulation time and a preset modulation depth; the electrical signal at both ends of the modulated time-varying capacitor is used to characterize the humidity of the environment to be measured. The system can achieve low-noise and high-sensitivity humidity detection.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a humidity detection system, humidity detection equipment, humidity detection method and computer equipment based on time modulation. Background Art

[0002] Traditional LC wireless passive sensors consist of an inductive coil antenna and a sensitive capacitor, whose capacitance is adjusted according to the change of physical or chemical quantities, thereby modulating the resonant frequency of the sensor. Wireless passive detection can be achieved by tracking the resonant frequency shift in impedance analysis. In recent years, wireless passive LC sensors based on special points (EP) have become an emerging sensor telemetry method because their eigenvalue bifurcation at the EP point can significantly improve the sensitivity. In particular, those sensors with standard or high-order PT symmetric topology enhance the sensitivity of the resonant frequency shift through the eigenvalue bifurcation caused by the EP point.

[0003] However, since PT systems usually rely on active components such as operational amplifiers, this not only increases system complexity but also may cause instability and noise problems, thus hindering its popularity in practical wireless passive sensing applications.

[0004] Therefore, in order to solve the problems of high noise and low sensitivity in the prior art, a new high-sensitivity humidity sensor detection system is urgently needed. Summary of the invention

[0005] Based on this, it is necessary to provide a humidity detection system, humidity detection equipment, humidity detection method and computer equipment based on time modulation.

[0006] In a first aspect, the present application provides a humidity detection system based on time modulation, the system comprising:

[0007] Sensitive capacitor: the capacitance value of the sensitive capacitor is correlated with the humidity of the environment to be tested;

[0008] A sensor inductor coil, both ends of which are connected to a sensitive capacitor;

[0009] A readout circuit inductor coil, the readout circuit inductor coil is coupled to the sensor inductor coil;

[0010] A modulated time-varying capacitor, the modulated time-varying capacitor is connected to two ends of the inductor coil of the readout circuit, and the capacitance value of the modulated time-varying capacitor changes periodically according to a preset modulation time and a preset modulation depth;

[0011] The electrical signal across the modulated time-varying capacitor is used to characterize the humidity of the environment to be tested.

[0012] In one embodiment, the time-varying capacitance can be modulated, including:

[0013] A first fixed capacitor connected to two ends of the inductor of the readout circuit;

[0014] The mixer is connected in parallel with the first fixed capacitor, and is used to provide a mixing signal to the first fixed capacitor, so that the first fixed capacitor changes periodically according to a preset modulation time and a preset modulation depth under the action of the mixing signal.

[0015] In one embodiment, the sensitive capacitor comprises:

[0016] A second fixed capacitor, a first end of the second fixed capacitor is connected to a first end of the sensor inductor coil;

[0017] A variable capacitor, a first end of the variable capacitor and a second end of the fixed capacitor, and a capacitance value of the variable capacitor is correlated with the humidity of the environment to be measured.

[0018] In one embodiment, the capacitance value of the first fixed capacitor is equal to the capacitance value of the second fixed capacitor.

[0019] In one of the embodiments, under the initial humidity of the environment to be tested, the capacitance value of the variable capacitor is equal to the capacitance value of the first fixed capacitor.

[0020] In one embodiment, the sensor inductor coil and the readout circuit inductor coil are coaxially arranged, and a coupling distance between the sensor inductor coil and the readout circuit inductor coil is less than twice the diameter of the sensor inductor coil.

[0021] In a second aspect, the present application also provides a humidity detection device, the device comprising:

[0022] Spectrum analyzer;

[0023] As in the humidity detection system based on time modulation in the above-mentioned embodiment, the spectrum analyzer is connected to both ends of the inductor coil of the readout circuit.

[0024] In a third aspect, the present application further provides a humidity detection method, which is applied to the humidity detection device in the above embodiment, and the method comprises:

[0025] Obtaining the voltage spectrum of the modulatable time-varying capacitor;

[0026] Determine the humidity change of the environment to be tested according to the voltage spectrum and the reference voltage spectrum;

[0027] The reference voltage spectrum is the voltage spectrum of the modulatable time-varying capacitor under the initial humidity of the environment to be tested.

[0028] In one embodiment, determining the humidity change of the environment to be tested according to the voltage spectrum and the reference voltage spectrum includes:

[0029] Obtain the splitting frequency of the voltage spectrum and the characteristic frequency of the reference voltage spectrum;

[0030] If the splitting frequency gradually becomes greater than the characteristic frequency, it is determined that the humidity of the environment to be tested is gradually increasing;

[0031] If the characteristic frequency is gradually smaller than the characteristic frequency, it is determined that the humidity of the environment to be tested is gradually decreasing.

[0032] In a fourth aspect, the present application provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method in the above embodiment when executing the computer program.

[0033] The above-mentioned humidity detection system, humidity detection device, humidity detection method and computer device based on time modulation have at least the following beneficial effects:

[0034] The capacitance value change caused by the sensitive capacitor responding to the change of environmental humidity affects the resonant frequency of the LC resonant circuit, and then the mutual inductance coupling between the sensor inductor coil and the readout circuit inductor coil enables the readout circuit to detect the frequency change of the LC resonant circuit; at the same time, the periodic change of the modulated time-varying capacitor ensures that the system characteristic frequency is calibrated under fixed humidity conditions, and finally, by monitoring the splitting of the characteristic frequency relative to the EP point in the voltage spectrum of the readout circuit end, high-sensitivity detection of environmental humidity changes is achieved. In addition, the system design avoids the use of active components and reduces noise sources, thereby achieving low-noise and high-sensitivity humidity detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 Schematic diagram of the structure of a humidity detection system based on time modulation in one embodiment;

[0037] Figure 2 is a structural schematic diagram of a humidity detection system based on time modulation in another embodiment;

[0038] Figure 3 Schematic diagram of a humidity detection method in one embodiment;

[0039] Figure 4It is a flowchart of the steps of determining the humidity change of the environment to be tested according to the voltage spectrum and the reference voltage spectrum in one embodiment;

[0040] Figure 5 A voltage spectrum diagram measured by a spectrum analyzer in one embodiment;

[0041] Figure 6 FIG. 4 is a voltage spectrum diagram measured by a spectrum analyzer in another embodiment. DETAILED DESCRIPTION

[0042] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0044] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0045] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0046] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least part of an element” means part or all of an element.

[0047] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0048] In an exemplary embodiment, Figure 1 As shown, the present application provides a humidity detection system based on time modulation, which includes an LC wireless passive sensor 1 and a readout circuit 2, wherein the LC wireless passive sensor 1 includes a sensitive capacitor 12 and a sensor inductor 11, and the readout circuit 2 includes a readout circuit inductor 21 and a modulated time-varying capacitor 22. The capacitance value of the sensitive capacitor 12 is correlated with the humidity of the environment to be measured; the two ends of the sensor inductor 11 are connected to the sensitive capacitor 12; the readout circuit inductor 21 is coupled to the sensor inductor 11; the modulated time-varying capacitor 22 is connected to the two ends of the readout circuit inductor 21, and the capacitance value of the modulated time-varying capacitor 22 changes periodically according to a preset modulation time and a preset modulation depth; the electrical signal at both ends of the modulated time-varying capacitor 22 is used to characterize the humidity of the environment to be measured.

[0049] Among them, the sensitive capacitor 12 can refer to a cross-finger capacitor that is sensitive to humidity, and a layer of humidity-sensitive material is coated on the cross-finger as a medium. The capacitance value of the sensitive capacitor 12 is correlated with the humidity of the environment to be measured, that is, when the environmental humidity changes, the capacitance value of the sensitive capacitor 12 will also change accordingly. When the change in environmental humidity causes the capacitance value of the sensitive capacitor 12 to change, the resonant frequency of the LC resonant circuit composed of the sensor inductor 11 and the sensitive capacitor 12 will also change. The readout circuit inductor 21 is coupled to the sensor inductor 11, and energy is exchanged through the mutual inductive coupling between the inductors. Through near-field inductive coupling, the resonant frequency change of the LC resonant circuit can be monitored. The modulated time-varying capacitor 22 is connected in parallel to the two ends of the readout circuit inductor 21. The introduction of the modulated time-varying capacitor 22 ensures that the system can produce certain time-varying characteristics, thereby allowing the system to modulate its output signal according to the change of the sensitive capacitor 12, and finally characterize the change of environmental humidity by monitoring the frequency spectrum of the terminal voltage of the modulated time-varying capacitor 22.

[0050] Exemplarily, one end of the sensitive capacitor 12 is connected to the sensor inductor 11 to form an LC resonant circuit. When the ambient humidity changes, the capacitance value of the sensitive capacitor 12 changes accordingly, causing the resonant frequency of the LC resonant circuit to shift. The sensor inductor 11 is connected in parallel with the sensitive capacitor 12 to form an LC wireless passive sensor 1. The sensor inductor 11 is responsible for capturing the frequency shift of the LC resonant circuit caused by the change of the sensitive capacitor 12. The sensor inductor 11 and the readout circuit inductor 21 are coupled by mutual inductance, so that the frequency change of the LC resonant circuit can be transmitted to the readout circuit 2. The readout circuit inductor 21 receives energy from the LC resonant circuit through mutual inductance coupling, and then detects the frequency change of the LC resonant circuit. Among them, the capacitance value of the modulated time-varying capacitor 22 changes periodically according to the preset modulation time and preset modulation depth. Based on the design of the modulated time-varying capacitor 22, it is ensured that the system has set the modulation time and modulation depth before the measurement starts, so as to determine the characteristic frequency (EP point) of the system.

[0051] When the humidity detection system is placed in the environment to be tested, in the initial state, the characteristic frequency in the voltage spectrum read from the readout circuit 2 by a device such as a spectrum analyzer 23 is a fixed value; when the ambient humidity changes, the capacitance value of the sensitive capacitor 12 changes accordingly, causing the resonant frequency of the LC resonant circuit to shift, and then causing the characteristic frequency in the voltage spectrum read from the readout circuit 2 to split relative to the EP point. Based on this, high-sensitivity detection of changes in ambient humidity can be achieved. The design of the humidity detection system avoids the use of active components, reduces noise sources, and makes the system as a whole have a lower noise level. Therefore, by monitoring the changes in the voltage spectrum at the end of the readout circuit 2, the changes in ambient humidity can be sensitively characterized, and low-noise, high-sensitivity humidity detection can be achieved.

[0052] The humidity detection system based on time modulation described above responds to the change in capacitance value caused by the change in ambient humidity through the sensitive capacitor 12, thereby affecting the resonant frequency of the LC resonant circuit, and then through the mutual inductance coupling between the sensor inductor 11 and the readout circuit inductor 21, the readout circuit 2 can detect the frequency change of the LC resonant circuit; at the same time, the periodic change of the modulated time-varying capacitor 22 ensures that the system characteristic frequency is calibrated under fixed humidity conditions, and finally, by monitoring the splitting of the characteristic frequency relative to the EP point in the voltage spectrum at the end of the readout circuit 2, high-sensitivity detection of ambient humidity changes is achieved, and since the system design avoids the use of active components and reduces noise sources, low-noise, high-sensitivity humidity detection is achieved.

[0053] In an exemplary embodiment, Figure 2As shown, the modulated time-varying capacitor 22 includes: a first fixed capacitor 222 and a mixer 221. The first fixed capacitor 222 is connected to both ends of the readout circuit inductor 21; the mixer 221 is connected in parallel with the first fixed capacitor 222, and the mixer 221 is used to provide a mixing signal to the first fixed capacitor 222, so that the first fixed capacitor 222 changes periodically according to a preset modulation time and a preset modulation depth under the action of the mixing signal.

[0054] Among them, although the first fixed capacitor 222 is called a "fixed capacitor", in this embodiment, its capacitance value can actually be modulated. When the mixing signal provided by the mixer 221 acts on the first fixed capacitor 222, the charge distribution of the first fixed capacitor 222 will change over time, so that the equivalent capacitance value presents a periodic change according to the preset modulation time and modulation depth (such as Figure 2 The C(t)-T curve shown in ), makes the capacitance value of the first fixed capacitor 222 show periodic increase and decrease, so that the capacitance value of the modulated time-varying capacitor shows periodic change as a whole. The mixer 221 is an electronic device that can generate a mixing signal and provide this signal to the first fixed capacitor 222. The mixing signal generated by the mixer 221 will affect the charge distribution on the first fixed capacitor 222, causing its capacitance value to change regularly over time according to the preset modulation time and modulation depth. By adjusting the parameters of the mixing signal, the capacitance value change of the first fixed capacitor 222 can be accurately controlled, so that the entire system can simulate the EP point behavior similar to that in the PT symmetric system without external active components, thereby ensuring that the humidity detection system can be calibrated under specific humidity conditions, and by monitoring the splitting of the characteristic frequency relative to the EP point in the voltage spectrum at the end of the readout circuit 2, a high-sensitivity detection of changes in ambient humidity is achieved.

[0055] In this embodiment, by introducing a modulated time-varying capacitor 22, including a first fixed capacitor 222 and a mixer 221, it is possible to simulate the EP point behavior similar to that in a PT symmetric system without using active components, thereby realizing high-sensitivity detection of changes in ambient humidity in a low-noise environment. Specifically, the mixing signal provided by the mixer 221 causes the charge distribution of the first fixed capacitor 222 to change regularly over time, causing its equivalent capacitance value to increase and decrease periodically, simulating the behavior of a time-varying capacitor, which not only simplifies the system design and reduces the noise and stability problems caused by the use of active components in a traditional PT symmetric system, but also ensures that the system can be accurately calibrated under specific humidity conditions, thereby realizing high-sensitivity and low-noise detection of changes in ambient humidity by monitoring the splitting of the characteristic frequency in the voltage spectrum at the end of the readout circuit 2 relative to the EP point.

[0056] In an exemplary embodiment, Figure 2As shown, the sensitive capacitor 12 includes: a second fixed capacitor 122 and a variable capacitor 121. The first end of the second fixed capacitor 122 is connected to the first end of the sensor inductor 11; the first end of the variable capacitor 121 is connected to the second end of the fixed capacitor, and the capacitance value of the variable capacitor 121 is correlated with the humidity of the environment to be measured.

[0057] Wherein, the second fixed capacitor 122 works together with the variable capacitor 121 to ensure that under specific environmental humidity conditions, the characteristic frequency of the humidity detection system can be calibrated to a certain specific value. This helps to accurately detect humidity changes by splitting the characteristic frequency relative to the EP point when the environmental humidity changes. The capacitance value of the variable capacitor 121 is correlated with the humidity of the environment to be measured, that is, when the environmental humidity changes, the capacitance value of the variable capacitor 121 will also change accordingly. The variable capacitor 121 is usually a finger capacitor made of a humidity-sensitive material, and a layer of humidity-sensitive medium is coated on its fingers. As the environmental humidity changes, the dielectric constant of this layer of medium will change, thereby causing a change in capacitance. This change will affect the resonant frequency of the LC resonant circuit, and then the change of this frequency is detected by the readout circuit inductor 21, thereby realizing high-sensitivity detection of environmental humidity changes.

[0058] In this embodiment, by combining the second fixed capacitor 122 with the variable capacitor 121, it is ensured that the characteristic frequency of the system can be calibrated to a specific value under specific environmental humidity conditions, so that when the environmental humidity changes, the humidity change can be accurately detected by splitting the characteristic frequency relative to the EP point. By using a finger capacitor made of a humidity-sensitive material as the variable capacitor 121, when the environmental humidity changes, the dielectric constant of the humidity-sensitive medium coated on the finger changes, resulting in a change in the capacitance value, which in turn affects the resonant frequency of the LC resonant circuit. By detecting this frequency change, a high-sensitivity detection of environmental humidity changes is achieved.

[0059] In an exemplary embodiment, the capacitance value of the first fixed capacitor 222 is equal to the capacitance value of the second fixed capacitor 122 .

[0060] For example, the capacitance value of the first fixed capacitor 222 and the capacitance value of the second fixed capacitor 122 are adjusted to the same value, and when the readout circuit 2 performs reading, the natural frequency can be This natural frequency can be used for normalization in the subsequent characteristic frequency calculation to facilitate calculation, thereby simplifying the characteristic frequency calculation process and ensuring the consistency of the system's response under different humidity conditions, thereby improving the accuracy and reliability of humidity detection.

[0061] In an exemplary embodiment, under the initial humidity of the environment to be tested, the capacitance value of the variable capacitor 121 is equal to the capacitance value of the first fixed capacitor 222 .

[0062] Exemplarily, under the initial humidity of the environment to be tested, the capacitance value of the variable capacitor 121 is adjusted to be equal to the capacitance value of the first fixed capacitor 222, that is, the characteristic frequency (EP point) of the system is calibrated to a specific value under specific environmental humidity conditions, so that when the environmental humidity does not change, the system can accurately calibrate the characteristic frequency under the current humidity conditions; and when the environmental humidity changes, the system can accurately read the current humidity changes based on the previously calibrated characteristic frequency, thereby achieving high-sensitivity detection of environmental humidity changes.

[0063] In an exemplary embodiment, the sensor inductor 11 and the readout circuit inductor 21 are coaxially arranged, and the coupling distance between the sensor inductor 11 and the readout circuit inductor 21 is less than twice the diameter of the sensor inductor 11 .

[0064] Exemplarily, the sensor inductor 11 and the readout circuit inductor 21 are placed coaxially, and the coupling distance between them is less than twice the diameter of the sensor inductor 11 to ensure the coupling strength, that is, the coupling coefficient is not too small, thereby ensuring that there is a strong mutual inductance coupling between the sensor inductor 11 and the readout circuit inductor 21, thereby ensuring that the system can efficiently transmit energy and information, and enhancing the system's detection sensitivity to changes in ambient humidity.

[0065] In an exemplary embodiment, the present application further provides a humidity detection device, which includes: a spectrum analyzer and a humidity detection system based on time modulation as in the above embodiment, wherein the spectrum analyzer is connected to both ends of the inductor coil of the readout circuit.

[0066] In an exemplary embodiment, Figure 3 As shown, the present application also provides a humidity detection method, which is applied to the humidity detection device in the above embodiment, and the method includes:

[0067] S302, obtaining a voltage spectrum of a modulatable time-varying capacitor;

[0068] S304, determining the humidity change of the environment to be tested according to the voltage spectrum and the reference voltage spectrum;

[0069] The reference voltage spectrum is the voltage spectrum of the modulatable time-varying capacitor under the initial humidity of the environment to be tested.

[0070] Exemplarily, before performing humidity detection of the environment to be tested, it is necessary to ensure that the capacitance values ​​of the first capacitor in the modulatable time-varying capacitor and the second capacitor in the sensitive capacitor are equal, and the capacitance value can be the capacitance value corresponding to the variable capacitor under the initial humidity of the environment to be tested, so as to determine the voltage spectrum corresponding to the initial humidity of the environment to be tested, and use it as the reference voltage spectrum. At the same time, ensure that the coupling distance between the sensor inductor coil and the readout circuit inductor coil is less than twice the diameter of the sensor inductor coil, wherein the diameter of the sensor inductor coil and the readout circuit inductor coil are the same and the inductance value is equal. On the basis of the above, the humidity detection device is placed in the environment to be tested, and the voltage spectrum of the readout circuit is measured by a spectrum analyzer, and the voltage spectrum is compared with the reference voltage spectrum to determine whether the frequency splitting phenomenon occurs, thereby realizing high-sensitivity detection of the ambient humidity. When the ambient humidity does not change, the voltage spectrum is measured to have a single characteristic frequency (EP point). When the ambient humidity changes slightly, the characteristic frequency of the system will produce a frequency splitting phenomenon, thereby sensitively characterizing the change in the ambient humidity.

[0071] The above humidity detection method ensures that the capacitance values ​​of the first capacitor in the modulated time-varying capacitor and the second capacitor in the sensitive capacitor are equal, and controls the coupling distance between the sensor inductor coil and the readout circuit inductor coil to be less than twice the diameter of the sensor inductor coil, thereby ensuring the accurate calibration of the coupling strength and characteristic frequency of the system under specific environmental humidity conditions. It not only simplifies the calibration steps of humidity detection, but also realizes high-sensitivity detection of environmental humidity changes by comparing the measured voltage spectrum with the reference voltage spectrum, ensuring that the system can sensitively characterize humidity changes through the splitting phenomenon of characteristic frequencies when the environmental humidity changes, thereby improving the accuracy and reliability of humidity detection.

[0072] In an exemplary embodiment, Figure 4 As shown, according to the voltage spectrum and the reference voltage spectrum, the humidity change of the environment to be tested is determined, including:

[0073] S402, obtaining the splitting frequency of the voltage spectrum and the characteristic frequency of the reference voltage spectrum;

[0074] S404, if the splitting frequency is gradually greater than the characteristic frequency, it is determined that the humidity of the environment to be tested is gradually increasing;

[0075] S406: If the characteristic frequency is gradually smaller than the characteristic frequency, it is determined that the humidity of the environment to be tested is gradually decreasing.

[0076] For example, Figure 5 As shown, Figure 5 The voltage spectrum read from the readout circuit when the humidity is low. The dotted peak in the figure is the characteristic frequency (EP point) of the reference voltage spectrum, and the two red peaks are the splitting frequencies of the read voltage spectrum. Figure 6 This is the voltage spectrum read from the readout circuit when the humidity is high. The dotted peak in the figure is the characteristic frequency (EP point) of the reference voltage spectrum, and the two red peaks are the splitting frequencies of the read voltage spectrum. It can be seen from the figure that when the humidity increases, the sensitive capacitance value increases, and the splitting frequency on the right is farther away from the EP point; conversely, when the humidity decreases, the sensitive capacitance value decreases, and the splitting frequency on the left is farther away from the EP point. Moreover, the greater the change in ambient humidity, the higher the degree of frequency splitting, that is, the splitting frequency is farther away from the EP point.

[0077] In this embodiment, by comparing the splitting frequency of the voltage spectrum with the characteristic frequency (EP point) of the reference voltage spectrum, the change of the humidity of the environment to be measured can be accurately determined. When the splitting frequency is gradually greater than the characteristic frequency, it indicates that the humidity is gradually increasing; when the splitting frequency is gradually less than the characteristic frequency, it indicates that the humidity is gradually decreasing. This method utilizes the characteristic frequency splitting phenomenon and characterizes the humidity change through intuitive spectrum changes, which not only simplifies the humidity detection process, but also improves the sensitivity and accuracy of the detection, ensuring that the system can effectively monitor and characterize the changes in the environmental humidity.

[0078] In an exemplary embodiment, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method in the above embodiment when executing the computer program.

[0079] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0080] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A humidity detection system based on time modulation, characterized in that: The system comprises: A sensitive capacitor, wherein the capacitance value of the sensitive capacitor is correlated with the humidity of the environment to be measured; A sensor inductor coil, wherein two ends of the sensor inductor coil are connected to the sensitive capacitor; a readout circuit inductor, the readout circuit inductor coupled to the sensor inductor; A modulated time-varying capacitor, the modulated time-varying capacitor is connected to both ends of the inductor of the readout circuit, and the capacitance value of the modulated time-varying capacitor changes periodically according to a preset modulation time and a preset modulation depth, so as to determine the characteristic frequency of the system before the measurement starts; The electrical signal at both ends of the modulatable time-varying capacitor is used to characterize the humidity of the environment to be measured; Wherein, the coupling distance between the sensor inductor coil and the readout circuit inductor coil is less than twice the diameter of the sensor inductor coil; Wherein, the modulatable time-varying capacitor comprises: A first fixed capacitor connected to two ends of the inductor of the readout circuit; A mixer is connected in parallel with the first fixed capacitor, and is used to provide a mixing signal to the first fixed capacitor, so that the first fixed capacitor changes periodically according to the preset modulation time and the preset modulation depth under the action of the mixing signal.

2. The humidity detection system based on time modulation according to claim 1 is characterized in that: The sensitive capacitor comprises: A second fixed capacitor, wherein a first end of the second fixed capacitor is connected to a first end of the sensor inductor coil; A variable capacitor, a first end of the variable capacitor and a second end of the fixed capacitor, and a capacitance value of the variable capacitor is correlated with the humidity of the environment to be measured.

3. The humidity detection system based on time modulation according to claim 2 is characterized in that: The capacitance value of the first fixed capacitor is equal to the capacitance value of the second fixed capacitor.

4. The humidity detection system based on time modulation according to claim 3 is characterized in that: Under the initial humidity of the environment to be tested, the capacitance value of the variable capacitor is equal to the capacitance value of the first fixed capacitor.

5. A humidity detection device, characterized in that: The device comprises: Spectrum analyzer; According to the humidity detection system based on time modulation as described in any one of claims 1 to 4, the spectrum analyzer is connected to both ends of the inductor coil of the readout circuit.

6. A humidity detection method, characterized in that: Applied to the humidity detection device as claimed in claim 5, the method comprises: Acquiring a voltage spectrum of the modulatable time-varying capacitor; Determining humidity changes in the environment to be tested according to the voltage spectrum and the reference voltage spectrum; The reference voltage spectrum is the voltage spectrum of the modulatable time-varying capacitor under the initial humidity of the environment to be tested.

7. The humidity detection method according to claim 6, characterized in that: Determining the humidity change of the environment to be tested according to the voltage spectrum and the reference voltage spectrum includes: Acquire the splitting frequency of the voltage spectrum and the characteristic frequency of the reference voltage spectrum; If the splitting frequency is gradually greater than the characteristic frequency, it is determined that the humidity of the environment to be tested is gradually increasing; If the characteristic frequency is gradually smaller than the characteristic frequency, it is determined that the humidity of the environment to be measured is gradually decreasing.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 6 to 7 are implemented.

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