CN111077346A - Micro-cantilever-beam-based soil humidity monitoring method, device, equipment and medium - Google Patents
Micro-cantilever-beam-based soil humidity monitoring method, device, equipment and medium Download PDFInfo
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Abstract
The invention provides a micro-cantilever beam-based soil humidity monitoring method, a micro-cantilever beam-based soil humidity monitoring device, micro-cantilever beam-based soil humidity monitoring equipment and a micro-cantilever beam-based soil humidity monitoring medium. The method comprises the following steps: detecting the state of the piezoelectric micro-cantilever and recording the initial resonance frequency of the piezoelectric micro-cantilever; detecting the state of the piezoelectric micro-cantilever in real time, acquiring data of the piezoelectric micro-cantilever when water molecules are detected to be attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to a vibration equation of the piezoelectric micro-cantilever; and calculating the resonance frequency variation of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency of the piezoelectric micro-cantilever, and analyzing the soil humidity according to the resonance frequency variation. According to the invention, the coating for measuring water molecules is coated on the piezoelectric micro-cantilever, the water molecules are adsorbed on the piezoelectric micro-cantilever to generate vibration on the piezoelectric micro-cantilever, and the humidity of the soil is analyzed according to the change of the resonance frequency. Through this kind of mode, make statistics of to the hydrone, can more accurate measurement soil moisture.
Description
Technical Field
The invention relates to the technical field of soil detection, in particular to a soil humidity monitoring method, a soil humidity monitoring device, soil humidity monitoring equipment and a soil humidity monitoring medium based on a micro-cantilever.
Background
When profile observation is carried out in the field, the degree of soil moisture is distinguished and generally measured by dryness, slight moisture, wetness, dampness and humidity, the soil moisture is an important environmental factor for connecting water resources inside, and the soil moisture has important influence on the fields of hydrology, meteorology, agricultural production and the like, so that how to measure the soil moisture becomes a research focus in recent years.
The existing soil measurement technology measures the humidity of soil through a wireless sensor, but the existing technology still has the following defects that as the soil detection area is large, the data volume generated through the detection of the wireless sensor is too large, and a system needs to consume a large amount of data for processing; the measurement precision of soil measurement is low, so how to accurately measure the soil humidity through water molecules in the soil becomes a problem to be solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
In view of the above, the invention provides a micro-cantilever-based soil humidity monitoring method, device, equipment and medium, and aims to solve the technical problem that water molecules in soil cannot be measured according to a piezoelectric micro-cantilever in the prior art.
The technical scheme of the invention is realized as follows:
in one aspect, the invention provides a micro-cantilever-based soil humidity monitoring method, which comprises the following steps:
s1, detecting the state of the piezoelectric micro-cantilever and recording the initial resonance frequency of the piezoelectric micro-cantilever;
s2, detecting the state of the piezoelectric micro-cantilever in real time, acquiring the data of the piezoelectric micro-cantilever when detecting that water molecules are attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to the vibration equation of the piezoelectric micro-cantilever;
and S3, calculating the resonance frequency change of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency of the piezoelectric micro-cantilever, and analyzing the soil humidity according to the resonance frequency change.
On the basis of the above technical solution, preferably, in step S1, detecting the state of the piezoelectric micro-cantilever, and recording the initial resonance frequency of the piezoelectric micro-cantilever, further comprising the following steps of detecting the state of the piezoelectric micro-cantilever, and recording the initial resonance frequency of the piezoelectric micro-cantilever when the state of the piezoelectric micro-cantilever is detected to be the initial state; and when the state of the piezoelectric micro-cantilever beam is not detected to be the initial state, adjusting the piezoelectric micro-cantilever beam to be the initial state, and recording the initial resonance frequency of the piezoelectric micro-cantilever beam at the moment.
On the basis of the above technical solution, preferably, in step S2, the state of the piezoelectric micro-cantilever is detected in real time, when it is detected that a water molecule is attached to the piezoelectric micro-cantilever, data of the piezoelectric micro-cantilever is obtained, and the resonance frequency of the piezoelectric micro-cantilever is calculated according to a vibration equation of the piezoelectric micro-cantilever, and further including the steps of setting a data threshold, when it is detected that a water molecule is attached to the piezoelectric micro-cantilever, obtaining data of the piezoelectric micro-cantilever in real time, comparing the obtained data of the piezoelectric micro-cantilever with the data threshold, and when the obtained data of the piezoelectric micro-cantilever is greater than the data threshold, taking the data of the piezoelectric micro-cantilever at this time as data to be calculated, and calculating the data to be calculated according to the vibration equation of the piezoelectric micro-cantilever to obtain the resonance frequency of the piezoelectric micro-.
On the basis of the above technical solution, preferably, the method further includes the following steps, and the vibration equation of the piezoelectric micro-cantilever is:
wherein, the dissipation constant gamma is the reciprocal of the time required for the system energy to fall to 1/e of the original value, and gamma is b/m*B is a damping coefficient related to soil density and viscosity, m*Is the effective mass, omega, of the piezoelectric microcantilever0Is the resonant frequency of the piezoelectric microcantilever in air, F0eiαThe method is characterized in that the method comprises the following steps of (1) the exciting force of the piezoelectric micro-cantilever, y the depth of the piezoelectric micro-cantilever in the soil, and t the measuring time of the piezoelectric micro-cantilever in the soil.
On the basis of the above technical solution, preferably, the method further includes the step of determining the resonant frequency ω of the piezoelectric micro-cantilever in the air0The formula of (1) is:
wherein Y is the young's modulus, and b, h, and L are the width, thickness, and length, respectively, of the piezoelectric micro-cantilever.
On the basis of the above technical solution, preferably, the method further includes the following steps, and the calculation formula of the resonance frequency of the piezoelectric micro-cantilever is:
wherein the content of the first and second substances,
n1is a correction coefficient, R is a constant, η and ρ are the viscosity and density of the soil, m is the effective mass of the piezoelectric micro-cantilever in the soil, and m ═ m*+m1，m1Called inductive mass, and m1＝2/3πρR3。
On the basis of the above technical solution, preferably, in step S3, the method includes calculating a change amount of the resonance frequency of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency, and analyzing the soil humidity according to the change amount of the resonance frequency, and further includes the following steps of setting a soil humidity level, where the soil humidity level includes: dry, slightly moist, moist and wet, different soil humidity levels correspond to different resonant frequency changes, and soil is graded through the resonant frequency changes according to the soil humidity levels.
Still further preferably, the micro-cantilever based soil moisture monitoring device comprises:
the recording module is used for detecting the state of the piezoelectric micro-cantilever and recording the initial resonance frequency of the piezoelectric micro-cantilever;
the calculation module is used for detecting the state of the piezoelectric micro-cantilever in real time, acquiring data of the piezoelectric micro-cantilever when water molecules are detected to be attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to a vibration equation of the piezoelectric micro-cantilever;
and the analysis module is used for calculating the resonance frequency change of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency of the piezoelectric micro-cantilever and analyzing the soil humidity according to the resonance frequency change.
In a second aspect, the micro-cantilever based soil moisture monitoring method further comprises an apparatus comprising: a memory, a processor, and a micro-cantilever based soil moisture monitoring method program stored on the memory and executable on the processor, the micro-cantilever based soil moisture monitoring method program configured to implement the steps of the micro-cantilever based soil moisture monitoring method as described above.
In a third aspect, the micro-cantilever-based soil humidity monitoring method further includes a medium, where the medium is a computer medium, the computer medium stores a micro-cantilever-based soil humidity monitoring method program, and the micro-cantilever-based soil humidity monitoring method program, when executed by a processor, implements the above-described steps of the micro-cantilever-based soil humidity monitoring method.
Compared with the prior art, the soil humidity monitoring method based on the micro-cantilever beam has the following beneficial effects:
(1) the piezoelectric micro-cantilever is coated with the material coating layer for adsorbing water molecules in soil, the humidity of the soil is analyzed through the water molecules in the soil, the humidity information of the soil can be accurately obtained, and meanwhile, the condition that the system is crashed due to the fact that too much data need to be processed in the monitoring process is avoided;
(2) through the little cantilever beam of piezoelectricity to the humidity of soil analysis, the hydroecium adheres to on the little cantilever beam of piezoelectricity in the soil, through observing the change of the little cantilever beam resonant frequency of piezoelectricity, utilizes resonant frequency's change to carry out quantitative analysis to the testee, through this kind of mode, can be accurate and swift acquire the humidity of soil, has avoided need to measure a large amount of data in the testing process, the condition of extravagant resource.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an apparatus in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a soil moisture monitoring method according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of functional modules of a soil moisture monitoring method according to a first embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the device, and that in actual implementations the device may include more or less components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a storage 1005 as a medium may include an operating system, a network communication module, a user interface module, and a micro-cantilever-based soil moisture monitoring method program therein.
In the device shown in fig. 1, the network interface 1004 is mainly used for establishing a communication connection between the device and a server storing all data required in the micro-cantilever-based soil moisture monitoring method system; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 of the micro-cantilever-based soil humidity monitoring method device can be arranged in the micro-cantilever-based soil humidity monitoring method device, and the micro-cantilever-based soil humidity monitoring method device calls the micro-cantilever-based soil humidity monitoring method program stored in the memory 1005 through the processor 1001 and executes the micro-cantilever-based soil humidity monitoring method provided by the invention.
Referring to fig. 2, fig. 2 is a schematic flow chart of a soil moisture monitoring method based on a micro-cantilever according to a first embodiment of the present invention.
In this embodiment, the method for monitoring soil humidity based on the micro-cantilever includes the following steps:
s10: and detecting the state of the piezoelectric micro-cantilever and recording the initial resonance frequency of the piezoelectric micro-cantilever.
It will be appreciated that the invention and development of atomic force microscopy has provided us with a highly sensitive sensing device, namely a micro-cantilever, which has two modes of operation, namely a bending mode and a resonant mode. The bending mode measures the static deformation of the micro-cantilever under the action of external force, and the resonance mode measures the change of the resonance frequency of the micro-cantilever. Theoretically, the resonance frequency of the micro-cantilever is in reciprocal relation with the 1/2 th power of the effective mass of the micro-cantilever, and after the substance to be detected is adsorbed on the micro-cantilever, the resonance frequency of the micro-cantilever is reduced, so that the quantitative analysis of the substance to be detected can be carried out by detecting the change of the resonance frequency of the micro-cantilever.
It should be understood that, before the detection is performed, the state of the piezoelectric micro-cantilever is checked, and when the state of the piezoelectric micro-cantilever is not the initial state, the system automatically adjusts the state of the piezoelectric micro-cantilever to the initial state, and simultaneously records the resonant frequency of the piezoelectric micro-cantilever. By the mode, the influence of other factors on the piezoelectric micro-cantilever is reduced to the minimum, and the accuracy of the piezoelectric micro-cantilever in detecting the soil humidity can be ensured.
S20: and detecting the state of the piezoelectric micro-cantilever in real time, acquiring data of the piezoelectric micro-cantilever when detecting that water molecules are attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to a vibration equation of the piezoelectric micro-cantilever.
It should be understood that, when the sensitive layer is coated on the surface of the micro-cantilever, when water molecules are adsorbed on the micro-cantilever, the effective mass of the micro-cantilever will increase, which will result in the decrease of the resonance frequency of the micro-cantilever, and there is a certain relation between the change of the resonance frequency of the micro-cantilever and the measured quantity, and the measured quantity can be obtained by checking the vibration change of the micro-cantilever.
It should be understood that the piezoelectric micro-cantilever refers to a piezoelectric film prepared on the surface of the micro-cantilever by using micro-machining technology, the micro-cantilever can be excited to vibrate by applying an alternating voltage to the piezoelectric film, when the micro-cantilever vibrates, charges are generated on the surface of the piezoelectric film, and when the charges are accumulated, a current is formed. This current is proportional to the amplitude of the piezoelectric micro-cantilever. Therefore, the resonance frequency of the piezoelectric micro-cantilever can be better captured through the electric charges.
It should be understood that, in this embodiment, a data threshold is set, when the system detects that a water molecule is attached to the piezoelectric micro-cantilever, the system acquires data of the piezoelectric micro-cantilever in real time, and compares the data with the set data threshold, and only when the acquired data of the piezoelectric micro-cantilever is greater than the data threshold and the acquired data of the piezoelectric micro-cantilever is not changed, the data of the piezoelectric micro-cantilever at this time is taken as data to be calculated, and the data to be calculated is calculated according to a vibration equation of the piezoelectric micro-cantilever to acquire a resonance frequency of the piezoelectric micro-cantilever.
In this embodiment, the resonant frequency ω of the piezoelectric micro-cantilever in air0The formula of (1) is:
wherein Y is the young's modulus, and b, h, and L are the width, thickness, and length, respectively, of the piezoelectric micro-cantilever.
In soil, the vibration equation of the piezoelectric microcantilever is:
wherein, the dissipation constant gamma is the reciprocal of the time required for the system energy to fall to 1/e of the original value, and gamma is b/m*B is a damping coefficient related to soil density and viscosity, m*Is the effective mass, omega, of the piezoelectric microcantilever0Is the resonant frequency of the piezoelectric microcantilever in air, F0eiαThe method is characterized in that the method comprises the following steps of (1) the exciting force of the piezoelectric micro-cantilever, y the depth of the piezoelectric micro-cantilever in the soil, and t the measuring time of the piezoelectric micro-cantilever in the soil.
The piezoelectric microcantilever can be considered as a vibrating sphere with radius R, which experiences resistance in the soil:
wherein η and ρ are soilsω is the piezoelectric microcantilever resonance frequency, m1Called inductive mass, and m1＝2/3πρR3It increases the effective mass of the piezoelectric microcantilever, and thus the effective mass of the piezoelectric microcantilever is m ═ m*+m1According to the formula in the above description, the vibration equation may become:
wherein the dissipation constant
At the fixed end of the piezoelectric micro-cantilever, i.e. the state where x is 0, one can obtain: y (0) ═ 0, y' (0) ═ 0, at the free end: y' (0) is 0, and y "(0) is 0, thereby obtaining the resonance frequency ω of the piezoelectric micro-cantilever:
wherein the content of the first and second substances,
since the piezoelectric micro-cantilever is not a true sphere, the correction coefficient n is added in the formula1。
S30: and calculating the resonance frequency variation of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency of the piezoelectric micro-cantilever, and analyzing the soil humidity according to the resonance frequency variation.
It should be understood that the system will set soil moisture levels including: the system comprises a piezoelectric micro-cantilever beam, a humidity sensor, a controller and a controller, wherein the humidity sensor is used for detecting the humidity of the soil, and the humidity sensor is used for detecting the humidity of the soil.
The above description is only for illustrative purposes and does not limit the technical solutions of the present application in any way.
As can be easily found from the above description, the present embodiment records the initial resonant frequency of the piezoelectric micro-cantilever by detecting the state of the piezoelectric micro-cantilever; detecting the state of the piezoelectric micro-cantilever in real time, acquiring data of the piezoelectric micro-cantilever when water molecules are detected to be attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to a vibration equation of the piezoelectric micro-cantilever; and calculating the resonance frequency variation of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency of the piezoelectric micro-cantilever, and analyzing the soil humidity according to the resonance frequency variation. The coating for measuring water molecules is coated on the piezoelectric micro-cantilever beam, the water molecules are adsorbed on the piezoelectric micro-cantilever beam to enable the piezoelectric micro-cantilever beam to vibrate, and the humidity of the soil is analyzed according to the change of the resonance frequency. Through this kind of mode, make statistics of to the hydrone, can more accurate measurement soil moisture.
In addition, the embodiment of the invention also provides a soil humidity monitoring device based on the micro-cantilever. As shown in fig. 3, the micro-cantilever based soil moisture monitoring device includes: a recording module 10, a calculating module 20 and an analyzing module 30.
The recording module 10 is used for detecting the state of the piezoelectric micro-cantilever and recording the initial resonance frequency of the piezoelectric micro-cantilever;
the calculation module 20 is used for detecting the state of the piezoelectric micro-cantilever in real time, acquiring data of the piezoelectric micro-cantilever when water molecules are detected to be attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to a vibration equation of the piezoelectric micro-cantilever;
and the analysis module 30 is configured to calculate a resonant frequency variation of the piezoelectric micro-cantilever according to the resonant frequency and the initial resonant frequency of the piezoelectric micro-cantilever, and analyze the soil humidity according to the resonant frequency variation.
In addition, it should be noted that the above-described embodiments of the apparatus are merely illustrative, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of the modules to implement the purpose of the embodiments according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment may be referred to a soil humidity monitoring method based on the micro-cantilever provided in any embodiment of the present invention, and are not described herein again.
In addition, an embodiment of the present invention further provides a medium, where the medium is a computer medium, where a micro-cantilever-based soil humidity monitoring method program is stored on the computer medium, and when executed by a processor, the micro-cantilever-based soil humidity monitoring method program implements the following operations:
s1, detecting the state of the piezoelectric micro-cantilever and recording the initial resonance frequency of the piezoelectric micro-cantilever;
s2, detecting the state of the piezoelectric micro-cantilever in real time, acquiring the data of the piezoelectric micro-cantilever when detecting that water molecules are attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to the vibration equation of the piezoelectric micro-cantilever;
and S3, calculating the resonance frequency change of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency of the piezoelectric micro-cantilever, and analyzing the soil humidity according to the resonance frequency change.
Further, when being executed by a processor, the micro-cantilever-based soil humidity monitoring method further realizes the following operations:
detecting the state of the piezoelectric micro-cantilever beam, and recording the initial resonance frequency of the piezoelectric micro-cantilever beam when the state of the piezoelectric micro-cantilever beam is detected to be the initial state; and when the state of the piezoelectric micro-cantilever beam is not detected to be the initial state, adjusting the piezoelectric micro-cantilever beam to be the initial state, and recording the initial resonance frequency of the piezoelectric micro-cantilever beam at the moment.
Further, when being executed by a processor, the micro-cantilever-based soil humidity monitoring method further realizes the following operations:
setting a data threshold, acquiring data of the piezoelectric micro-cantilever in real time when water molecules are detected to be attached to the piezoelectric micro-cantilever, comparing the acquired data of the piezoelectric micro-cantilever with the data threshold, taking the data of the piezoelectric micro-cantilever as data to be calculated when the acquired data of the piezoelectric micro-cantilever is larger than the data threshold, and calculating the data to be calculated according to a vibration equation of the piezoelectric micro-cantilever to acquire the resonance frequency of the piezoelectric micro-cantilever.
Further, when being executed by a processor, the micro-cantilever-based soil humidity monitoring method further realizes the following operations:
the vibration equation of the piezoelectric microcantilever is:
wherein, the dissipation constant gamma is the reciprocal of the time required for the system energy to fall to 1/e of the original value, and gamma is b/m*B is a damping coefficient related to soil density and viscosity, m*Is the effective mass, omega, of the piezoelectric microcantilever0Is the resonant frequency of the piezoelectric microcantilever in air, F0eiαThe method is characterized in that the method comprises the following steps of (1) the exciting force of the piezoelectric micro-cantilever, y the depth of the piezoelectric micro-cantilever in the soil, and t the measuring time of the piezoelectric micro-cantilever in the soil.
Further, when being executed by a processor, the micro-cantilever-based soil humidity monitoring method further realizes the following operations:
resonance frequency omega of piezoelectric micro-cantilever in air0The formula of (1) is:
wherein Y is the young's modulus, and b, h, and L are the width, thickness, and length, respectively, of the piezoelectric micro-cantilever.
Further, when being executed by a processor, the micro-cantilever-based soil humidity monitoring method further realizes the following operations:
the formula for calculating the resonance frequency of the piezoelectric micro-cantilever beam is as follows:
wherein the content of the first and second substances,
n1is a correction coefficient, R is a constant, η and ρ are the viscosity and density of the soil, m is the effective mass of the piezoelectric micro-cantilever in the soil, and m ═ m*+m1，m1Called inductive mass, and m1＝2/3πρR3。
Further, when being executed by a processor, the micro-cantilever-based soil humidity monitoring method further realizes the following operations:
setting a soil moisture level, the moisture level comprising: dry, slightly moist, moist and wet, different soil humidity levels correspond to different resonant frequency changes, and soil is graded through the resonant frequency changes according to the soil humidity levels.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A soil humidity monitoring method based on micro-cantilever beams is characterized in that: comprises the following steps;
s1, detecting the state of the piezoelectric micro-cantilever and recording the initial resonance frequency of the piezoelectric micro-cantilever;
s2, detecting the state of the piezoelectric micro-cantilever in real time, acquiring the data of the piezoelectric micro-cantilever when detecting that water molecules are attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to the vibration equation of the piezoelectric micro-cantilever;
and S3, calculating the resonance frequency change of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency of the piezoelectric micro-cantilever, and analyzing the soil humidity according to the resonance frequency change.
2. The micro-cantilever based soil moisture monitoring method of claim 1, wherein: in step S1, detecting the state of the piezoelectric micro-cantilever and recording the initial resonant frequency of the piezoelectric micro-cantilever, further comprising the steps of detecting the state of the piezoelectric micro-cantilever and recording the initial resonant frequency of the piezoelectric micro-cantilever when the state of the piezoelectric micro-cantilever is detected to be the initial state; and when the state of the piezoelectric micro-cantilever beam is not detected to be the initial state, adjusting the piezoelectric micro-cantilever beam to be the initial state, and recording the initial resonance frequency of the piezoelectric micro-cantilever beam at the moment.
3. The micro-cantilever based soil moisture monitoring method of claim 1, wherein: and step S2, detecting the state of the piezoelectric micro-cantilever beam in real time, acquiring the data of the piezoelectric micro-cantilever beam when detecting that a water molecule is attached to the piezoelectric micro-cantilever beam, and calculating the resonance frequency of the piezoelectric micro-cantilever beam according to the vibration equation of the piezoelectric micro-cantilever beam.
4. The micro-cantilever based soil moisture monitoring method of claim 3, wherein: the method further comprises the following steps that the vibration equation of the piezoelectric micro cantilever beam is as follows:
wherein the dissipation constant gamma is 1/e of the original value of the system energyThe reciprocal of the time required, γ ═ b/m*B is a damping coefficient related to soil density and viscosity, m*Is the effective mass, omega, of the piezoelectric microcantilever0Is the resonant frequency of the piezoelectric microcantilever in air, F0eiαThe method is characterized in that the method comprises the following steps of (1) the exciting force of the piezoelectric micro-cantilever, y the depth of the piezoelectric micro-cantilever in the soil, and t the measuring time of the piezoelectric micro-cantilever in the soil.
5. The micro-cantilever based soil moisture monitoring method of claim 4, wherein: the method also comprises the following step that the resonance frequency omega of the piezoelectric micro-cantilever in the air0The formula of (1) is:
wherein Y is the young's modulus, and b, h, and L are the width, thickness, and length, respectively, of the piezoelectric micro-cantilever.
6. The micro-cantilever based soil moisture monitoring method of claim 4, wherein: the method further comprises the following steps that the calculation formula of the resonance frequency of the piezoelectric micro-cantilever beam is as follows:
wherein the content of the first and second substances,
n1is a correction coefficient, R is a constant, η and ρ are the viscosity and density of the soil, m is the effective mass of the piezoelectric micro-cantilever in the soil, and m ═ m*+m1，m1Called inductive mass, and m1＝2/3πρR3。
7. The micro-cantilever based soil moisture monitoring method of claim 1, wherein: in step S3, the method includes the steps of calculating a change in the resonant frequency of the piezoelectric micro-cantilever from the resonant frequency of the piezoelectric micro-cantilever and the initial resonant frequency, and analyzing the soil humidity according to the change in the resonant frequency, and setting a soil humidity level, wherein the soil humidity level includes: dry, slightly moist, moist and wet, different soil humidity levels correspond to different resonant frequency changes, and soil is graded through the resonant frequency changes according to the soil humidity levels.
8. The utility model provides a soil moisture monitoring devices based on micro-cantilever beam which characterized in that, soil moisture monitoring devices based on micro-cantilever beam includes:
the recording module is used for detecting the state of the piezoelectric micro-cantilever and recording the initial resonance frequency of the piezoelectric micro-cantilever;
the calculation module is used for detecting the state of the piezoelectric micro-cantilever in real time, acquiring data of the piezoelectric micro-cantilever when water molecules are detected to be attached to the piezoelectric micro-cantilever, and calculating the resonance frequency of the piezoelectric micro-cantilever according to a vibration equation of the piezoelectric micro-cantilever;
and the analysis module is used for calculating the resonance frequency change of the piezoelectric micro-cantilever according to the resonance frequency and the initial resonance frequency of the piezoelectric micro-cantilever and analyzing the soil humidity according to the resonance frequency change.
9. An apparatus, characterized in that the apparatus comprises: a memory, a processor, and a micro-cantilever based soil moisture monitoring method program stored on the memory and executable on the processor, the micro-cantilever based soil moisture monitoring method program configured to implement the steps of the micro-cantilever based soil moisture monitoring method as claimed in any one of claims 1 to 7.
10. A medium, characterized in that the medium is a computer medium, on which a micro-cantilever based soil moisture monitoring method program is stored, which when executed by a processor implements the steps of the micro-cantilever based soil moisture monitoring method according to any one of claims 1 to 7.
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