CN107843634B - Embedded compost environment detection device and system - Google Patents
Embedded compost environment detection device and system Download PDFInfo
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- CN107843634B CN107843634B CN201711020889.XA CN201711020889A CN107843634B CN 107843634 B CN107843634 B CN 107843634B CN 201711020889 A CN201711020889 A CN 201711020889A CN 107843634 B CN107843634 B CN 107843634B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/414—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/10—Thermometers specially adapted for specific purposes for measuring temperature within piled or stacked materials
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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Abstract
The invention provides an embedded compost environment detection device and a system, wherein the device comprises: the reactor comprises a conical upper shell and a hemispherical bottom shell, wherein the conical upper shell is connected together through rotary extrusion of a sealing ring, a pH probe made of stainless steel is mounted at the top end of the conical upper shell, 3 through holes are formed in the upper end of the conical upper shell, an optical fiber oxygen probe, a temperature sensor and a water content sensor interface are respectively mounted in the through holes, and 2 stainless steel rings for measuring the water content and the conductivity of a reactor body are further mounted on the conical upper shell; the device comprises a conical upper shell, a pH probe, an optical fiber oxygen probe, a temperature sensor, a water content sensor, a communication module and a gateway device, wherein a circuit board is arranged in the conical upper shell, a sensor interface is arranged on the circuit board and used for collecting information received by the pH probe, the optical fiber oxygen probe, the temperature sensor and the water content sensor interface, and the communication module is arranged on the circuit board and used for transmitting the collected information to the gateway device.
Description
Technical Field
The invention relates to the field of agricultural environment monitoring, in particular to embedded compost environment detection equipment and system.
Background
At present, pollution caused by waste discharged in rural life, agricultural production and livestock and poultry breeding processes in China and environmental problems caused by crop straw burning are increasingly severe, the nutrient content in agricultural waste is high, and nutrient substances taken away from soil are not enough to be returned only by chemical fertilizers. Aerobic fermentation compost is currently one of the most important and more efficient methods for treating agricultural waste due to its stability and harmlessness. The composting process realizes the integration of composting management and control by automatically monitoring the environmental parameters of the compost on line, can reduce the labor cost, quicken the fermentation process, improve the fermentation efficiency, accord with the development trend of a closed and environment-friendly reactor composting system, slow down the environmental pressure, complete the conversion from the traditional composting mode with natural composting and serious pollution to the intelligent production process of sensor monitoring and machine control, and has important practical significance for further improving the composting efficiency and quality and realizing the intelligent composting in China.
In present compost environmental monitoring technology, the common use means is through handheld mobile terminal, utilize the probe to measure the compost environment in the heap body, in prior art, handheld mobile monitoring, the consumption is big, the operation installation is inconvenient, production process on-line monitoring is mainly with temperature measurement, the parameter is single, other parameters are acquireed on line seldom, sensor packaging structure is mostly long probe-rod type, length exceeds 1 meter, influence mechanical operation, the sensor takes out when turning over, simultaneously, the collection of information and communication mainly use wired communication, adopt wireless mode more to draw the wireless radio frequency part to the heap external portion unshielded, need the trompil in closed compost system, increase the construction volume.
in the prior art, the embedded wireless sensor network is more applied and researched in soil with relatively stable physical environment, can not be continuously tested in high-temperature, corrosive environment and fermentation biochemical environment, and simultaneously has difficulties in data transmission and networking in a pile.
Disclosure of Invention
In order to solve the problems that in the prior art, in the compost environment monitoring process, continuous tests cannot be carried out in a high-temperature, corrosive environment and fermentation biochemical environment, the data acquisition is single, and the measuring equipment is limited, the embedded compost environment detection equipment and the embedded compost environment detection system are provided.
according to one aspect of the invention, there is provided an embedded compost environment detection device comprising: the reactor comprises a conical upper shell and a hemispherical bottom shell, wherein the conical upper shell is connected together through rotary extrusion of a sealing ring, a pH probe made of stainless steel is mounted at the top end of the conical upper shell, 3 through holes are formed in the upper end of the conical upper shell, an optical fiber oxygen probe, a temperature sensor and a water content sensor interface are respectively mounted in the through holes, and 2 stainless steel rings for measuring the water content and the conductivity of a reactor body are further mounted on the conical upper shell;
The conical upper shell is internally provided with a circuit board, the circuit board is provided with a sensor interface for collecting information collected by the pH probe, the optical fiber oxygen probe, the temperature sensor and the water content sensor, and the circuit board is also provided with a communication module for transmitting the collected information to the gateway equipment.
Wherein the communication module comprises a low frequency communication module and a high frequency communication module.
The low-frequency communication module is used for communicating with other composting environment detection equipment and charging a battery on the circuit board.
The high-frequency communication module is used for transmitting the information collected by the sensor to the gateway equipment through an antenna embedded on the conical outer surface of the conical shell.
the gateway equipment is also connected with mobile equipment, and sends the information collected by the sensor to the mobile equipment through a wireless network.
The embedded type compost environment detection equipment and the gateway equipment are also provided with a signal intensity receiving module which is used for receiving wireless transmission signal intensity information of the embedded type compost environment detection equipment in a plurality of numbers and sending the information intensity information to the mobile equipment, and the mobile equipment also calculates the position information of the embedded type compost environment detection equipment by receiving the wireless signal intensity information and according to the GPS positioning information of the mobile equipment.
Wherein the antenna on the conical surface and the gateway are connected through a Lora network.
And a magnet is arranged on the hemispherical bottom shell and used for recovering the embedded compost environment detection equipment.
Preferably, the pH probe is an ISFET probe.
Wherein the water content sensor measures the water content and the conductivity in the stack by a capacitance method and a single probe loop measurement method.
According to a second aspect of the invention, an embedded compost environment detection device and system are provided, which comprise: at least one embedded composting environment detection device, gateway device, controller and server as provided in the above first aspect.
The embedded compost environment detection device receives compost environment information in a compost body and sends the compost environment information to the server through the gateway device, and the controller is used for receiving data of the server and communicating with the embedded compost environment detection device through the gateway device to realize collection and diagnosis of the compost environment information.
The embedded compost environment detection equipment is used for carrying out communication between the embedded compost environment detection equipment by adopting a low-frequency communication network; the embedded compost environment detection device is communicated with the gateway device through a Lora communication network.
The embedded compost environment detection device provided by the invention has the advantages of small volume and low power consumption, greatly simplifies the field monitoring and installation process, increases the monitoring redundancy, can be seamlessly combined with all current compost modes, is convenient to recover and maintain, provides a new monitoring mode for compost, is integrally designed, has high integration level and firm packaging, does not need independent monitoring of various sensors, reduces the requirements of various online measuring instruments, and realizes long-time monitoring of the compost environment.
drawings
FIG. 1 is a structural diagram of an embedded type compost environment detection device provided by an embodiment of the invention;
FIG. 2 is a block diagram of wireless charging and low-frequency transmission in an embedded compost environment detection device according to an embodiment of the present invention;
FIG. 3 is a composition diagram of internally collected power in an embedded compost environment detection device according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the detection of water content in a pile of an embedded compost environment detection device according to an embodiment of the present invention;
FIG. 5 is a block diagram of an embedded compost environment detection system according to another embodiment of the invention;
FIG. 6 is a schematic view of mobile and fixed multi-point positioning in an embedded compost environment detection apparatus according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
referring to fig. 1, fig. 1 is a structural diagram of an embedded compost environment detection device provided in an embodiment of the present invention, the device including:
The reactor comprises a conical upper shell 1 and a hemispherical bottom shell 2, wherein the conical upper shell is connected together through rotary extrusion of a sealing ring, a pH probe 3 made of stainless steel is mounted at the top end of the conical upper shell, 3 through holes are formed in the upper end of the conical upper shell, an optical fiber oxygen probe 4, a temperature sensor 5 and a water content sensor interface 6 are mounted in the through holes respectively, and 2 stainless steel rings 7 used for measuring the water content and the conductivity of a reactor body are further mounted on the conical upper shell;
The conical upper shell is internally provided with a circuit board 8, the circuit board is provided with a sensor interface 12 for collecting information collected by the pH probe 3, the optical fiber oxygen probe 4, the temperature sensor 5 and the water content sensor interface 6, and the circuit board 8 is also provided with a communication module for sending the collected information to gateway equipment.
Specifically, the sensing equipment is characterized in that the upper part of a triangular cone made of POM steel material with the thickness of 10mm and the lower part of the semicircular cone are rotationally extruded into a whole through a sealing ring, the tip is a stainless steel material probe, a pH test probe is embedded in the stainless steel material probe, and the sensing equipment is completely sealed with the upper part of the triangular cone through rotational extrusion. The two stainless steel rings are internally embedded on the conical surface of the triangular plastic and used for measuring the water content and the conductivity of the stack body, a hole is formed in the stack body, a temperature sensor is placed in the stack body, and heat is transferred and measured through the stainless steel rings; the optical fiber oxygen probe is contacted with the stack body through the through hole, so that the oxygen in the stack body can be conveniently measured. The circuit board is fixed with the screw vacancy inside the triangular plastic cone through a self-tapping screw, the sensor is connected to the sensor interface, and the stainless steel ring for measuring the water content of the stack body is connected to the sensor interface of the circuit board through an opening. The radio frequency antenna is made into a ring shape and embedded in the conical surface of the triangular plastic and is connected with the circuit board through an inner opening. The circuit board is responsible for the collection of sensor signal and takes care of and provides wireless network deployment communication function, is responsible for perception equipment's power supply management simultaneously, and wireless charging and low frequency communication antenna multiplex are connected to and are charged for the lithium cell on the circuit board.
Through this device, integrated design, integrated level are high, the encapsulation is firm, need not the independent monitoring of multiple sensor, reduce multiple on-line measuring instrument's demand, have realized the long-time monitoring of heap body environment, and small, the low power dissipation simultaneously greatly simplifies on-the-spot monitoring installation procedure, increases the monitoring redundancy, can with present all compost modes seamless combination, convenient recovery maintenance.
On the basis of the above embodiment, the communication module includes a low frequency communication module and a high frequency communication module.
The low-frequency communication module is used for communicating with other composting environment detection equipment and charging a battery 11 on the circuit board. The high-frequency communication module is used for transmitting the information collected by the sensor to a gateway through an antenna 17 embedded on the conical outer surface of the conical shell. The antenna on the conical surface is connected with the gateway through a Lora network.
specifically, as shown in fig. 2 and 3, the wireless charging and low frequency communication antenna is multiplexed and connected to the circuit board to charge the lithium battery. The microprocessor communicates with the relay equipment through a serial port, a Lora transmission module and a high-frequency wireless antenna; the low-frequency wire-wound antenna has two functions of communication and wireless charging, is connected with the wireless charging chip P9025A and the battery protection circuit to charge the lithium battery, and provides a reliable power supply for the system through the power supply management circuit; and simultaneously, the antenna is switched to a SubGHz wireless communication module with a CC 1200-bit core through a radio frequency switch and is connected to a serial port of the microprocessor.
On the basis of the above embodiment, the embedded type compost environment detection devices and the gateway device are further provided with signal strength receiving modules, which are used for receiving wireless transmission signal strength information of the embedded type compost environment detection devices and sending the information strength information to the mobile device, and the mobile device further calculates the position information of the embedded type compost environment detection devices by receiving the wireless signal strength information and according to the GPS positioning information of the mobile device.
Specifically, as shown in fig. 6, in the mobile coordinated gateway multipoint hybrid positioning, both the gateway device and the mobile device can measure the signal strength of the wireless transmission (RSSI) of the sensing device, and determine the distance between the devices according to the signal strength. The routing function sensing device adopts three-point positioning, the positions of the mobile device and the gateway device are known, the RSSI of the routing function sensing device, the RSSI of the mobile device and the RSSI of the gateway device are respectively R1 and R3, meanwhile, the mobile device calculates the moving distance D based on GPS positioning information on the device, the RSSI of the sensing device and the RSSI of the mobile device are changed into R2, the distance between the mobile device and the gateway device can be measured to be L, and the distance L3 between the sensing device (relay function) and the gateway and the angle theta between the sensing device (relay function) and the horizontal plane can be. The positioning between the sensing devices adopts a two-point positioning mode, the signal strength R4 between the two devices is measured, and the distance between the two sensing devices is calculated according to the distance ratio L3/R3 between the previous relay and the gateway: l4 ═ (L3/R3) × R4.
On the basis of the above embodiment, the hemispherical bottom shell is provided with a magnet 14 for recovering the buried compost environment detection equipment.
Specifically, magnet is fixed in circular plastics lower part for make things convenient for perception equipment to retrieve, after the compost is accomplished, can sieve out perception equipment through the screen cloth equipment of compost factory, or discharging equipment conveyer belt passes through perception equipment bottom magnet and retrieves equipment.
On the basis of the above embodiment, the pH probe is an ISFET probe.
The water content sensor measures the water content and the conductivity in the stack by a capacitance method and a single-probe loop measurement method.
Specifically, as shown in fig. 4, fig. 4 is a diagram illustrating a structure of measuring the water content of the compost in the embedded compost environment detection device according to an embodiment of the present invention.
The soil water content adopts electric capacity method and single to visit two kinds of modes of ring and measure the dielectric constant in the heap body, and electric capacity method passes through inductance parallel resonance oscillation circuit, characterizes the electric capacity between two stainless steel rings of sensor through measuring resonant frequency's change to be connected to microprocessor through frequency dividing circuit, microprocessor calculates the frequency, obtains the heap body water content according to experiment linear proofreading formula. A single probing ring measuring mode is formed by switching a circuit, the water content and the conductivity (EC value) of the stack are measured, if the difference between the measured water content value and the water content value measured by a capacitance method is large, a user needs to be prompted to correct the water content measured by the capacitance method, and the measuring precision of the stack is improved. The high-frequency pulse generator provides 10M high-frequency electromagnetic pulses, the closed other end of the stainless steel ring is connected to the microprocessor through the detector, and the microprocessor measures the conduction time, the voltage value and the characteristic impedance and calculates the dielectric constant, the water content and the EC value of the stack.
Wherein, K ═ CT/2L]2
wherein K is the stack dielectric constant, C is the propagation speed of light in vacuum, T is the conduction time, and L is the stainless steel ring length.
H＝(-530+292K-5.5K2+0.043K3)/104
Wherein H is the water content of the stack
EC＝(εC Z0/LZc)(2V0/Vf-1)
wherein ε is a dielectric constant in vacuum, Z0Is the characteristic impedance, fixed constant, Z, of the steel ringcexchanging high frequency characteristic impedance for steel; v0Of pulse generatorsVoltage value, fixed constant; vfTo receive a measured voltage value.
By adopting the device, the dielectric constant, the water content and the conductivity value of the stack are measured by combining a capacitance method and a high-frequency single-ring method, the traditional probe measurement mode is changed, and the measurement structure is simplified.
Referring to fig. 5, fig. 5 is a block diagram of an embedded compost environment detection system according to another embodiment of the present invention, the system including: at least one of the above embodiments provides an embedded composting environment detection device 51, a gateway device 52, a controller 53 and a server 55
The embedded compost environment detection device 51 receives compost environment information in a compost body and sends the compost environment information to the server 56 through the gateway device 52, and the controller 53 receives data of the server and communicates with the embedded compost environment detection device 51 through the gateway device 52 to realize collection and diagnosis of the compost environment information.
The embedded compost environment detection equipment is used for carrying out communication between the embedded compost environment detection equipment by adopting a low-frequency communication network; the embedded compost environment detection device is communicated with the gateway device through a Lora communication network.
Specifically, a compost environment detection system is constructed and integrally comprises a sensing device, gateway equipment, a field controller, mobile equipment and a remote server. The sensing device inside the pile body is communicated with the sensing device through low-frequency 169MHz networking communication, the communication distance is prolonged by lower transmission frequency, and the stability of signal transmission of the sensing device in the pile body is ensured. The sensing device and the gateway equipment or the mobile equipment adopt Lora 433MHz radio frequency to transmit data. The whole network structure is a mesh network, and sensing equipment and gateway equipment or mobile equipment which can communicate with the outside of the stack in the network can only build a star network. The gateway equipment is connected to a remote server through GPRS or WIFI, and can also be connected to a field controller to provide data support for controlling the composting environment. The remote server constructs a cloud service to provide data and decision support for compost environment monitoring. The mobile device can access the cloud server and simultaneously communicate with the sensing device installed on site, and the requirements of mobile data acquisition and network on-site diagnosis and maintenance are met.
By the system, the purposes of wireless networking, multi-parameter online acquisition, reliable positioning and acquisition of various energy sources in the compost detection process are realized, and the intelligent level of compost environment monitoring is improved.
in a further embodiment of the invention, the sensing device is conveniently installed in a plurality of composting modes such as a chopping type composting mode, a closed reactor and the like, and can be arranged in an input material mixing stage or a composting starting process. The composting device with stirring conditions can randomly mix the sensing device into the compost body, and if no stirring device is arranged, the sensing device can be put into the composting stage or the composting stage is considered to be arranged on site. Because the sensing equipment is low-energy-consumption equipment and is in a dormant state most of the time, the equipment can construct a monitoring network through a networking process, each sensing equipment starts to adopt Lora high-frequency signals to try to communicate with the gateway equipment, if gateway handshake signals are obtained, the sensing equipment can be used as relay equipment of a sensor network in a wireless stack body, the relay equipment adopts a low-frequency mode to contact with nearby equipment which cannot communicate with the relay, if response is found, the sensing equipment can be added into the network constructed by the relay equipment at the first time, if other equipment cannot be added into the relay network, the sensing equipment can actively search nearby equipment through a low-frequency antenna, and if nearby devices can be found, the sensing equipment applies for adding into a multi-hop network. If the network cannot be accessed, the mobile device is required to move to acquire the approximate area of the device which cannot be connected, and acquisition devices are added in the area to realize the comprehensive coverage of the network.
The measuring equipment and the routing equipment acquire data at set time intervals and store the data in the equipment, the gateway equipment requests data to the internal network sensing equipment at regular time, and the sensing equipment transmits the data to the gateway equipment in a network link of the sensing equipment after receiving the data request. The gateway device performs preliminary sorting, screening and fusion on the data and sends the data to a remote cloud server, and if no network exists on site, the gateway device can be connected to the control device to provide data support for the control device. The mobile terminal can be in direct communication with the sensing equipment, so that the mobile terminal can obtain data in a moving mode and can sense the approximate position of the equipment to judge. Meanwhile, the mobile device and the field control device can acquire cloud server data through the network.
After the compost is accomplished, can sieve out perception equipment through the screening device of compost factory, or the discharging equipment conveyer belt passes through perception equipment bottom magnet and retrieves equipment, charges for perception equipment through wireless charging mode simultaneously.
finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An embedded compost environment detection device, comprising:
The reactor comprises a conical upper shell and a hemispherical bottom shell, wherein the conical upper shell is connected together through rotary extrusion of a sealing ring, a pH probe made of stainless steel is mounted at the top end of the conical upper shell, 3 through holes are formed in the upper end of the conical upper shell, an optical fiber oxygen probe, a temperature sensor and a water content sensor interface are respectively mounted in the through holes, and 2 stainless steel rings for measuring the water content and the conductivity of a reactor body are further mounted on the conical upper shell;
A circuit board is arranged in the conical upper shell, a sensor interface is arranged on the circuit board and used for collecting information received by the pH probe, the optical fiber oxygen probe, the temperature sensor and the water content sensor interface, and a communication module is also arranged on the circuit board and used for sending the collected information to gateway equipment; the communication module comprises a low-frequency communication module and a high-frequency communication module;
The high-frequency communication module is used for sending information collected by the sensor interface to the gateway equipment through an antenna embedded on the conical outer surface of the conical shell;
Wherein the antenna on the conical surface is connected with the gateway device through a Lora network; the conical upper shell and the hemispherical bottom shell are made of POM (polyoxymethylene) stainless steel; and the embedded compost environment detection equipment is communicated with each other by adopting a low-frequency communication network.
2. The device of claim 1, wherein the low frequency communication module is further configured to charge a battery on the circuit board.
3. The device of claim 1, wherein the gateway device is further coupled to a mobile device, and wherein the information collected by the sensor interface is transmitted to the mobile device via a wireless network.
4. The device of claim 3, wherein the embedded composting environment detection device and the gateway device are further installed with a signal strength receiving module, which is used for receiving wireless transmission signal strength information of a plurality of embedded composting environment detection devices and sending the signal strength information to the mobile device, and the mobile device further calculates the position information of the embedded composting environment detection devices by receiving the signal strength information and according to the GPS positioning information of the mobile device.
5. The apparatus of claim 1, wherein the hemispherical bottom housing has a magnet mounted thereon for recovery of the submerged composting environment detection apparatus.
6. The apparatus of claim 1 wherein the water content sensor measures the water content and conductivity of the stack by capacitance and single probe loop measurements.
7. An embedded compost environment detection system, comprising: at least one embedded composting environment detection device of claim 1, a gateway device, a controller, and a server;
The embedded compost environment detection device receives compost environment information in a compost body and sends the compost environment information to the server through the gateway device, and the controller is used for receiving data of the server and communicating with the embedded compost environment detection device through the gateway device to realize collection and diagnosis of the compost environment information.
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| CN204903528U (en) * | 2015-04-21 | 2015-12-23 | 国家海洋局第一海洋研究所 | Soil physics multi -parameter sensor |
| CN205665862U (en) * | 2016-04-28 | 2016-10-26 | 农业部环境保护科研监测所 | Soil environment detects automatic acquisition control system based on wireless communication |
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| DE102009010579A1 (en) * | 2009-02-25 | 2010-08-26 | ETH Zürich | System and method for remote monitoring of objects |
| CN102565150A (en) * | 2012-01-13 | 2012-07-11 | 北京盈胜泰科技术有限公司 | Detection device and monitoring system for soil relative humidity and soil fertility change |
| US9411070B2 (en) * | 2013-12-13 | 2016-08-09 | Cheng-Hung Chang | Extendable wireless soil measurement apparatus |
| CN203837744U (en) * | 2014-03-07 | 2014-09-17 | 国家海洋局第一海洋研究所 | Soil monitoring system based on Internet of Things |
| CN206388030U (en) * | 2016-12-20 | 2017-08-08 | 中国石油大学(北京) | A kind of device for being used to position field data acquisition equipment |
| CN106680432A (en) * | 2016-12-30 | 2017-05-17 | 北京农业智能装备技术研究中心 | Monitoring device for monitoring concentration of oxygen in compost and monitoring method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204903528U (en) * | 2015-04-21 | 2015-12-23 | 国家海洋局第一海洋研究所 | Soil physics multi -parameter sensor |
| CN205665862U (en) * | 2016-04-28 | 2016-10-26 | 农业部环境保护科研监测所 | Soil environment detects automatic acquisition control system based on wireless communication |
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