CN114878598A - Multi-grain-bin monitoring system for detecting water content of stored grain based on WSN microwave - Google Patents

Multi-grain-bin monitoring system for detecting water content of stored grain based on WSN microwave Download PDF

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Publication number
CN114878598A
CN114878598A CN202210394913.0A CN202210394913A CN114878598A CN 114878598 A CN114878598 A CN 114878598A CN 202210394913 A CN202210394913 A CN 202210394913A CN 114878598 A CN114878598 A CN 114878598A
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microwave
grain
signals
data
wireless transmission
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顾兆林
王星丹
孙艳军
魏启明
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Xian Jiaotong University
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Xian Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
    • G01N22/04—Investigating moisture content
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
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  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Health & Medical Sciences (AREA)
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Abstract

The invention discloses a multi-grain-bin monitoring system for detecting moisture content of grain stored in a bin based on WSN microwaves, which comprises a microwave transmitting device, a microwave receiving device, a wireless transmission device and a detection control device, wherein the microwave transmitting device is used for transmitting microwave signals to the grain, the microwave signals are reflected after passing through the grain, the microwave receiving device is used for receiving the microwave signals reflected by the grain, the wireless transmission device is in signal connection with the microwave receiving device, the wireless transmission device is used for converting the microwave signals of the microwave receiving device into data signals, the wireless transmission device is also used for outputting the data signals, the detection control device is in signal connection with the wireless transmission device, and the detection control device is used for receiving the data signals output by the wireless transmission device and detecting and analyzing the data signals. This many barns monitored control system can realize the detection of more accurate grain moisture content.

Description

Multi-grain-bin monitoring system for detecting water content of stored grain based on WSN microwave
Technical Field
The invention relates to the technical field of microwave application, in particular to a multi-grain-bin monitoring system for detecting moisture content of grain stored in a bin based on WSN (wireless sensor network) microwave.
Background
On the premise of guaranteeing the civil demand, redundant grains are stored in a large granary for the occasional need. During the storage process, the change of the moisture content inside the grains leads to grain loss. Therefore, the accurate detection of the moisture content of the grain in the granary is of great significance to the storage of the grain. The existing grain water content detection methods include a direct method, a capacitance method and a resistance method, but the detection result of the grain water content by the methods is not accurate. Because the grain needs to be fumigated under special storage conditions of the grain storage bin, the arrangement of wired equipment in the grain storage bin needs to be reduced as much as possible so as to avoid loss and damage. Traditional wired monitoring control system adopts the parcel method to protect the circuit, though wired monitored control system has the controllable scope of relatively great system, has increased along journey impedance, and the signal can attenuate in data send process, causes certain error to influence the detection accuracy of grain moisture content.
Disclosure of Invention
Based on this, it is necessary to provide a multi-grain-bin monitoring system for detecting moisture content of stored grains based on WSN microwave, so as to solve the technical problem in the prior art that the detection result of moisture content of grains is inaccurate.
The invention provides a multi-grain-bin monitoring system for detecting moisture content of stored grains based on WSN microwaves, which comprises:
the microwave transmitting device is used for transmitting microwave signals to the grains, and the microwave signals are reflected after passing through the grains;
the microwave receiving device is used for receiving microwave signals reflected by the grains;
the wireless transmission device is in signal connection with the microwave receiving device, is used for converting the microwave signal of the microwave receiving device into a data signal, and is also used for outputting the data signal; and
the detection control device is in signal connection with the wireless transmission device and is used for receiving the data signals output by the wireless transmission device and detecting and analyzing the data signals.
Furthermore, the microwave transmitting device comprises a microwave source and a microwave transmitting antenna, the microwave source is in signal connection with the microwave transmitting antenna, the microwave source is used for generating microwave signals, and the microwave transmitting antenna is used for transmitting the microwave signals generated by the microwave source to the grains.
Furthermore, the microwave transmitting device also comprises an isolator, the isolator is in signal connection with the microwave source, and the isolator is used for carrying out unidirectional propagation on the microwave signal generated by the microwave source.
Further, the microwave transmitting device also comprises a attenuator which is connected with the microwave source signal and is used for adjusting the transmitting frequency of the microwave signal generated by the microwave source.
Further, many barns monitored control system still includes temperature data acquisition terminal, temperature data acquisition terminal with wireless transmission device signal connection, temperature data acquisition terminal is used for gathering the temperature data of grain, and will temperature data transmission extremely wireless transmission device, wireless transmission device still is used for receiving temperature data, and will temperature data output extremely detection control device.
Furthermore, the wireless transmission device comprises a frequency-selecting amplifier and a single chip microcomputer, the frequency-selecting amplifier is respectively in signal connection with the microwave receiving device and the single chip microcomputer, the single chip microcomputer is in signal connection with the detection control device, the frequency-selecting amplifier is used for receiving microwave signals reflected by the grains, converting the microwave signals into voltage signals and transmitting the voltage signals to the single chip microcomputer, and the single chip microcomputer is used for receiving the voltage signals and converting the voltage signals into data signals.
Furthermore, the frequency selective amplifier comprises a microwave detection unit and a zero setting amplification circuit, the microwave detection unit is respectively in signal connection with the microwave receiving device and the zero setting amplification circuit, the zero setting amplification circuit is in signal connection with the single chip microcomputer, the microwave detection unit is used for demodulating the microwave signals of the microwave receiving device so as to reduce the frequency of the microwave signals, and the zero setting amplification circuit converts the microwave signals output by the microwave detection unit into voltage signals.
Furthermore, the wireless transmission device also comprises a ZigBee module and a ZigBee-GPRS gateway, wherein the ZigBee module is respectively in signal connection with the single chip microcomputer and the ZigBee-GPRS gateway, and the ZigBee-GPRS gateway is in signal connection with the detection control device.
Furthermore, the microwave transmitting device, the microwave receiving device, the single chip microcomputer and the ZigBee module are arranged in a plurality of numbers, and the plurality of microwave transmitting devices, the plurality of microwave receiving devices, the plurality of single chip microcomputers and the ZigBee module are arranged in a one-to-one correspondence manner.
Furthermore, the detection control device comprises a data control center and a PC display terminal, the data control center is respectively in signal connection with the wireless transmission device and the PC display terminal, the data control center is used for receiving the data signals output by the wireless transmission device and detecting and analyzing the data signals, and the PC display terminal is used for displaying the data signals detected and analyzed by the data signal center.
The invention provides a multi-grain-bin monitoring system for detecting moisture content of grain stored in a bin based on WSN microwaves, which comprises a microwave transmitting device, a microwave receiving device, a wireless transmission device and a detection control device, wherein the microwave transmitting device transmits microwave signals to the grain, the microwave receiving device receives the microwave signals reflected by the grain, the wireless transmission device converts the microwave signals of the microwave receiving device into data signals, and the detection control device detects and analyzes the data signals output by the wireless transmission device. Water molecules in the grains can generate a polarization phenomenon under the action of microwaves, and the more the water content is, the more the energy loss of the microwaves contacted with the grains is. The relationship between water cut and microwave energy loss can be expressed as a functional relationship. Therefore, voltage signals generated by the contact of the microwaves and the grain in the grain bin can be converted into the water content numerical value of the grain through signal conversion and functional relation, and the water content of the grain can be accurately detected. The multi-grain-bin monitoring system transmits signals by relying on the WSN, so that the problem that in the prior art, a wired monitoring control system protects a line by adopting a wrapping method, increases on-way impedance and causes errors is solved.
Drawings
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 structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of a multi-grain monitoring system in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a microwave transmitting antenna, a microwave receiving antenna and a wireless transmission device in an embodiment of the present invention.
The main components are as follows:
100. a microwave emitting device; 110. a microwave source; 120. a microwave transmitting antenna; 130. an isolator; 140. a asthenia machine; 200. a microwave receiving antenna; 300. a wireless transmission device; 310. a frequency selective amplifier; 320. a single chip microcomputer; 330. a ZigBee module; 340. a ZigBee-GPRS gateway; 400. a detection control device; 410. a data control center; 420. a PC display terminal; 500. a grain water content data acquisition terminal; 510. and a temperature data acquisition terminal. 600. A microwave receiving and transmitting loudspeaker; 610. a mixer; 700. grain.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1 and 2, a WSN-based multi-grain-bin monitoring system for detecting moisture content of grain stored in a bin by microwave includes a microwave transmitting device 100, a microwave receiving device, a wireless transmission device 300 and a detection control device 400, wherein the microwave transmitting device 100 is placed in the grain 700 when in use, the microwave transmitting device 100 is used for transmitting microwave signals to the grain 700, the microwave signals are reflected after passing through the grain 700, the microwave receiving device is placed in the grain 700 when in use, the microwave receiving device is used for receiving the microwave signals reflected by the grain 700, the wireless transmission device 300 is in signal connection with the microwave receiving device, the wireless transmission device 300 is used for converting the microwave signals of the microwave receiving device into data signals, the wireless transmission device 300 is further used for outputting the data signals, the detection control device 400 is in signal connection with the wireless transmission device 300, the detection control device 400 is used for receiving the data signals output by the wireless transmission device 300, and performing detection analysis on the data signals. Specifically, the microwave transmitting device 100 and the microwave receiving device are both powered by a 12V power supply. More specifically, the grain may be rice, wheat, or the like.
Further, a WSN (Wireless Sensor Networks) is a distributed sensing network, the tip of which is a Sensor that can sense and examine the outside world. The sensors in the WSN communicate in a wireless mode, so that the network setting is flexible, the position of equipment can be changed at any time, and the equipment can be connected with the Internet in a wired or wireless mode. A multi-hop ad hoc network formed by wireless communication.
When the microwave water content measuring device works, water molecules in grains can generate a polarization phenomenon under the action of microwaves, and the more the water content is, the more the energy loss of the microwaves contacted with the grains is. The relationship between water cut and microwave energy loss can be expressed as a functional relationship. Therefore, voltage signals generated by the contact of the microwaves and the grain in the grain bin can be converted into the water content numerical value of the grain through signal conversion and functional relation, and the water content of the grain can be accurately detected. In order to reduce loss and accurately obtain the specific numerical value of the moisture content of the grain in the granary, a wireless sensor network is adopted to transmit signals, so that the problems of difficult wiring and complex real-time monitoring in the current granary are solved.
Specifically, the microwave transmitting device 100 includes a microwave source 110 and a microwave transmitting antenna 120, the microwave source 110 is in signal connection with the microwave transmitting antenna 120, the microwave source 110 is used for generating a microwave signal, and the microwave transmitting antenna 120 is used for transmitting the microwave signal generated by the microwave source 110 to the grain 700. The microwave source 110 may use a gunn diode, a semiconductor device, as a microwave oscillation source to generate a microwave signal of 10 GHz.
Further, the microwave transmitting device 100 further includes an isolator 130, the isolator 130 is in signal connection with the microwave source 110, and the isolator 130 is used for unidirectionally propagating the microwave signal generated by the microwave source 110.
Further, the microwave transmitting device 100 further comprises a attenuator 140, the attenuator 140 is connected with the microwave source 110, and the attenuator 140 is used for adjusting the transmitting frequency of the microwave signal generated by the microwave source 110.
Preferably, the microwave receiving means may be a microwave receiving antenna 200. The microwave transmitting device 100 and the microwave receiving device can be regarded as a grain moisture content data collecting terminal 500.
In some embodiments, the multi-grain-bin monitoring system further includes a temperature data collecting terminal 510, the temperature data collecting terminal 510 is disposed in the grain bin, the temperature data collecting terminal 510 is in signal connection with the wireless transmission device 300, the temperature data collecting terminal 510 is configured to collect temperature data of the grain 700 and transmit the temperature data to the wireless transmission device 300, and the wireless transmission device 300 is further configured to receive the temperature data and output the temperature data to the detection control device 400. Because the temperature can produce certain influence to the dielectric property of water molecule, be equipped with temperature compensation system to the measurement of moisture content. The moisture content acquisition terminal and the temperature compensation acquisition terminal are used in a matched mode, namely one moisture content acquisition terminal is provided with a corresponding temperature compensation acquisition terminal. In order to better measure the moisture content of the grain, the moisture content acquisition terminal and the temperature compensation acquisition terminal are divided into an upper part, a middle part and a lower part which are arranged inside the granary so as to measure the real-time moisture content of the surface of the grain, the middle part of the grain pile and the bottom of the grain pile. Meanwhile, the moisture content acquisition terminals and the temperature compensation acquisition terminals are arranged in the horizontal direction according to the size of the granary, and the distance between the adjacent moisture content acquisition terminals and the adjacent temperature compensation acquisition terminals in the horizontal direction is 5 m.
In particular, the temperature data collection terminal 510 may be, but is not limited to being, a temperature sensor. More specifically, the temperature sensor is a digital temperature sensor DS18B 20.
In some embodiments, the wireless transmission device 300 includes a frequency-selective amplifier 310 and a single chip microcomputer 320, the frequency-selective amplifier 310 is in signal connection with the microwave receiving device and the single chip microcomputer 320 respectively, the single chip microcomputer 320 is in signal connection with the detection control device 400, the frequency-selective amplifier 310 is configured to receive microwave signals reflected by the grain 700 and convert the microwave signals into voltage signals, and transmit the voltage signals to the single chip microcomputer 320, and the single chip microcomputer 320 is configured to receive the voltage signals and convert the voltage signals into data signals. Specifically, the single chip microcomputer 320 may be, but is not limited to, an STM32L031F6P6 single chip microcomputer.
Further, the frequency selective amplifier 310 includes a microwave detection unit and a zeroing amplification circuit, the microwave detection unit is respectively in signal connection with the microwave receiving device and the zeroing amplification circuit, the zeroing amplification circuit is in signal connection with the single chip microcomputer 320, the microwave detection unit is configured to demodulate the microwave signal of the microwave receiving device to reduce the frequency of the microwave signal, and the zeroing amplification circuit converts the microwave signal output by the microwave detection unit into a voltage signal.
Furthermore, the multi-grain-bin monitoring system further comprises a microwave transceiving horn 600 and a filter, wherein the microwave transceiving horn 600 is powered by a direct current power supply, after the circuit is switched on, a microwave signal is generated by a microwave source 110, the microwave signal is transmitted in one direction through an isolator 130, then the frequency of the transmitted signal is adjusted through an attenuator, the microwave signal is transmitted from the microwave transceiving horn 600 through a microwave transmitting antenna 120, a certain energy loss is generated after the microwave signal is contacted with the grain 700, the transmitted microwave signal is a high-frequency microwave signal, the reflected microwave signal is a low-frequency microwave signal, a mixer 610 can be arranged to mix the high-frequency microwave signal and the low-frequency microwave signal to generate a medium-low-frequency stable signal, then the microwave signal is received by a microwave receiving device, the filter filters other microwave signals, the microwave signal in the selected frequency range is transmitted to a microwave detection unit, the microwave detection unit demodulates the microwave signal to reduce the frequency of the microwave signal, and outputting a detection signal by using an envelope detection mode, and processing an output voltage signal by using a zero setting amplification circuit. The moisture content signal detected in the circuit is generally a voltage signal, and the magnitude of the voltage value is inversely related to the magnitude of the moisture content in the grain 700. The single chip microcomputer 320 performs a/D conversion on the voltage signal and then processes the voltage signal into a digital signal.
Preferably, the wireless transmission device 300 further includes a ZigBee module 330 and a ZigBee-GPRS gateway 340, the ZigBee module 330 is in signal connection with the single chip microcomputer 320 and the ZigBee-GPRS gateway 340, respectively, and the ZigBee-GPRS gateway 340 is in signal connection with the detection control device 400. The ZigBee module 330 is connected with the ZigBee plus GPRS gateway based on ZigBee communication to perform data interactive transmission, and has the characteristics of short distance, low power consumption, low cost and simple data transmission. After TCP/IP conversion is performed on the data in the wireless transmission system, the data is transmitted to the data control center 410 by the GPRS module in the ZigBee + GPRS gateway based on the GPRS network. In particular, the ZigBee module 330 may be, but is not limited to, a CC2430 chip.
When the intelligent monitoring system works, the single chip microcomputer 320 transmits grain moisture content data and temperature data to the detection control device 400 through the ZigBee module 330 and the ZigBee-GPRS gateway 340 in sequence, the ZigBee module 330 collects collected data and transmits the collected data to the ZigBee-GPRS gateway 340, and the ZigBee-GPRS gateway 340 consists of a ZigBee coordinator, an embedded server and a GPRS module and is a transfer station for data exchange between ZigBee and the monitoring control system.
In some embodiments, the microwave emitting device 100, the microwave receiving device, the single chip microcomputer 320 and the ZigBee module 330 are provided in plurality, the plurality of microwave emitting devices 100, the plurality of microwave receiving devices, the single chip microcomputer 320 and the ZigBee module 330 are provided in one-to-one correspondence, each granary is provided with the microwave emitting device 100, the microwave receiving device, the single chip microcomputer 320 and the ZigBee module 330, and finally data is gathered to the detection control device 400, so that real-time monitoring of the plurality of granaries is realized.
Specifically, the detection control device 400 includes a data control center 410 and a PC display terminal 420, the data control center 410 is in signal connection with the wireless transmission device 300 and the PC display terminal 420 respectively, the data control center 410 is configured to receive the data signal output by the wireless transmission device 300 and perform detection analysis on the data signal, and the PC display terminal 420 is configured to display the data signal detected and analyzed by the data signal center.
More specifically, the GPRS module in the ZigBee-GPRS gateway 340 communicates with the data control center 410 based on the GPRS network; the data control center 410 acquires the collected data information related to the moisture content of the grain 700 through the GPRS network, and realizes control and management of the stored grain 700 on site. The PC display terminal 420 accesses the data control center 410 based on the ethernet, and displays the acquired real-time grain condition data of the grains 700 on the screen, and presents a comparison with a standard value, thereby facilitating monitoring and management.
Further, the data control center 410 collects data via the GPRS network, stores the data, and performs data networking with the user side via the ethernet network, thereby simplifying the moisture content data management of multiple grain bins and realizing the control and management of the grain 700 storage site.
Preferably, the PC display terminal 420, i.e., the user terminal, can monitor the moisture content data condition in the granary in real time by means of the ethernet, the ZigBee module 330 also has a positioning function, the user terminal can also input a specific query command through the terminal, and the data control center 410 identifies the command through the GPRS network and the ZigBee communication, and positions the command to a specific granary, thereby realizing accurate query of a moisture content value of a certain granary in a plurality of granary systems.
More preferably, the PC display terminal 420 can also store the data signal, and simultaneously compare the obtained data signal with the standard requirement of the moisture content of the grain, analyze the current grain conditions in each grain bin, and can give an alarm in time if the moisture content does not meet the standard requirement, thereby ensuring the good storage of the grain in the grain bin.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. The utility model provides a many granaries monitored control system based on WSN microwave detection storehouse grain moisture content which characterized in that includes:
the microwave transmitting device is used for transmitting microwave signals to the grains, and the microwave signals are reflected after passing through the grains;
the microwave receiving device is used for receiving microwave signals reflected by the grains;
the wireless transmission device is in signal connection with the microwave receiving device, is used for converting the microwave signal of the microwave receiving device into a data signal, and is also used for outputting the data signal; and
the detection control device is in signal connection with the wireless transmission device and is used for receiving the data signals output by the wireless transmission device and detecting and analyzing the data signals.
2. The multi-grain-barn monitoring system according to claim 1, wherein the microwave emitting device comprises a microwave source and a microwave emitting antenna, the microwave source is in signal connection with the microwave emitting antenna, the microwave source is used for generating microwave signals, and the microwave emitting antenna is used for emitting the microwave signals generated by the microwave source to the grains.
3. The multi-grain monitoring system of claim 2, wherein the microwave emitting device further comprises an isolator in signal connection with the microwave source, the isolator being configured to unidirectionally propagate the microwave signal generated by the microwave source.
4. The multi-grain monitoring system of claim 2, wherein the microwave emitting device further comprises a attenuator in signal connection with the microwave source, the attenuator being configured to adjust the emission frequency of the microwave signal generated by the microwave source.
5. The multi-grain-bin monitoring system according to claim 1, further comprising a temperature data acquisition terminal in signal connection with the wireless transmission device, wherein the temperature data acquisition terminal is used for acquiring temperature data of the grain and transmitting the temperature data to the wireless transmission device, and the wireless transmission device is further used for receiving the temperature data and outputting the temperature data to the detection control device.
6. The multi-grain-bin monitoring system according to claim 1, wherein the wireless transmission device comprises a frequency-selective amplifier and a single chip microcomputer, the frequency-selective amplifier is respectively in signal connection with the microwave receiving device and the single chip microcomputer, the single chip microcomputer is in signal connection with the detection control device, the frequency-selective amplifier is used for receiving microwave signals reflected by grains, converting the microwave signals into voltage signals and transmitting the voltage signals to the single chip microcomputer, and the single chip microcomputer is used for receiving the voltage signals and converting the voltage signals into data signals.
7. The multi-grain-barn monitoring system according to claim 6, wherein the frequency-selective amplifier comprises a microwave detection unit and a zero-setting amplification circuit, the microwave detection unit is respectively in signal connection with a microwave receiving device and the zero-setting amplification circuit, the zero-setting amplification circuit is in signal connection with the single chip microcomputer, the microwave detection unit is used for demodulating the microwave signals of the microwave receiving device so as to reduce the frequency of the microwave signals, and the zero-setting amplification circuit converts the microwave signals output by the microwave detection unit into voltage signals.
8. The multi-grain-barn monitoring system according to claim 6, wherein the wireless transmission device further comprises a ZigBee module and a ZigBee-GPRS gateway, the ZigBee module is respectively in signal connection with the single chip microcomputer and the ZigBee-GPRS gateway, and the ZigBee-GPRS gateway is in signal connection with the detection control device.
9. The multi-grain-barn monitoring system according to claim 8, wherein the microwave emitting device, the microwave receiving device, the single chip microcomputer and the ZigBee module are arranged in a plurality, and the plurality of microwave emitting devices, the microwave receiving device, the single chip microcomputer and the ZigBee module are arranged in a one-to-one correspondence manner.
10. The multi-grain barn monitoring system according to claim 1, wherein the detection control device comprises a data control center and a PC display terminal, the data control center is respectively in signal connection with the wireless transmission device and the PC display terminal, the data control center is used for receiving the data signals output by the wireless transmission device and detecting and analyzing the data signals, and the PC display terminal is used for displaying the data signals detected and analyzed by the data signal center.
CN202210394913.0A 2022-04-15 2022-04-15 Multi-grain-bin monitoring system for detecting water content of stored grain based on WSN microwave Pending CN114878598A (en)

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