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Agriculture weather station application


Date:(2018-5-18)   Clicks:3227

1. Brief Introduction

The agricultural meteorological and ecological environment monitoring system is an integrated meteorological monitoring system designed for agricultural meteorological services.The system has various functions such as meteorological monitoring,disease warning and provides strong information support for pest control,crop production,commercial and scientific analysis.The system can automatically collect,calculate,process and display various meteorological elements such as temperature,humidity,dew point,light intensity,rainfall,wind speed & direction,soil temperature,soil moisture,surface temperature, CO2 concentration and SO2 concentration.Storage, support for a variety of network communications capabilities,improve the observation efficiency.The system has the characteristics of stable performance,high monitoring accuracy and unattended operation.It is widely used in agricultural and forestry production and research departments such as farms,forest farms and breeding farms,aiming to solve the problem of modern agricultural production environment monitoring.Figure 1 shows a schematic diagram of an agricultural weather monitoring system.

Agricultural weather monitoring

Xi'an Zhongming Electrical Co.,ltd is a high-tech enterprise specialized in meteorological environmental monitoring.Based on years of experience in meteorological environment monitoring equipment manufacturing and system integration,we have designed a set of integrated solutions specifically for the intelligent agricultural meteorological service system.At present,the program has been applied at the Shinan Group's Minnan Aquaculture Center, etc. The system is well-designed and the technology is mature.

2. Functional characteristics

1. Automatic data collection and real-time upload.

2. The data collector has a data storage function and automatically uploads historical data after the communication is restored.

3. Data uploaded to the computer, supporting the form (Excel),curve diagram export,printing and other operations.

4. Support environmental parameters. Including:temperature,humidity,light intensity,wind speed & direction,rainfall,soil temperature,soil moisture,air pressure,CO2 concentration,SO2 concentration,etc.

5. The system supports RS232,RS458,Ethernet,optical fiber,GPRS,WiFi and other communication methods,which can effectively access various systems.

6. A variety of power modes to meet the needs of different users in different situations: battery,power adapter,solar energy.

3. The system composition

The intelligent agricultural meteorological data acquisition system consists of meteorological data collectors,meteorological sensors,power supply systems, stainless steel chassis,lightning protection devices,meteorological observation supports and meteorological data monitoring software in the background.The system incorporates new sensing technologies,electromagnetic compatibility technologies,data processing and signal analysis technologies,low-power design technologies and network communication technologies to achieve temperature,humidity,soil temperature,soil moisture,rainfall and air carbon dioxide in the park.The real-time monitoring of sulfur dioxide and other information is transmitted to the expert analysis system (backstage) through wired or wireless communication.The expert analysis system can store, statistically analyze, and analyze the collected information to report,curve,statistics.

Sensor installation diagram

3.1 Weather collector

Mounted on a meteorological observation stand,data of meteorological sensors such as temperature,humidity,wind speed,wind direction,atmospheric pressure,soil temperature and humidity,rainfall and harmful gas concentration may be collected through automatic or real-time controlled methods.With automatic timing,data storage after the interruption of the communication network,you can set the data collection interval through the background.

Meteorological collector picture

The data collector adopts low-power technology design,selects industrial-grade low-power ARM processor and expands large-capacity data storage for storing historical data.The system design adopts the external hardware watchdog,the processor's own watchdog and the software watchdog's multi-anti-system crash design scheme to ensure that the system can still work normally in harsh and harsh environments. The data collector mainly includes the following functions:

1.Timely or controlled collection of meteorological environmental parameters such as ambient temperature, humidity, wind speed, wind direction, and atmospheric pressure near the monitoring point, and transmission of monitoring data to the background.

2.With sensing,acquisition,processing and communication functions,corresponding acquisition and measurement can be performed.The measurement results can be transmitted to the data processing system through the wireless network live wired network. With meteorological data collection capabilities.

3.After power-on, it can start automatically. After receiving the data processing system startup command, it is initialized and restarted.

4.Accept data processing system instructions, change its own operating parameters and operating modes.

5.Receiving the time command of the data processing system, the time error should not exceed 5 s. The error within 24h of the clock should be less than 1s.

6.It has a certain data storage capacity, and can save the collected data for at least 30 days in a cyclic manner. The collection method is to collect at least one relevant parameter every minute.

7.can modify the system settings, device parameters and data acquisition methods.

3.2 Air temperature and humidity sensor

The temperature and humidity air pressure sensor uses imported digital temperature and humidity sensor probes and air pressure sensors to measure the temperature,humidity and air pressure in the air.Sensor elements and signal processing are integrated to output fully calibrated digital signals.The product has extremely high reliability and excellent long-term stability.The sensor includes a capacitive polymer moisture sensing element,a temperature measuring element made of energy gap material and seamless connection with a 14-bit A/D converter and a serial interface circuit on the same chip.Therefore,this product has the advantages of excellent quality,ultra-fast response,strong anti-interference ability and high cost performance.

Temperature and humidity sensor

The radiation protection cover is made of high-tech and high-quality anti-ultraviolet material,which can effectively block the ultraviolet radiation under natural conditions,prevent the instrument from aging rapidly under harsh conditions in the field, and reduce the measurement error caused by the strong light.Compared with wooden shutter boxes,light shutter boxes have the advantages of small size,light weight, and easy installation.The light shutter box is made of a herringbone annular plastic tray,which can ensure the free passage of air from any angle and reflect sunlight from any direction. Plastic discs are uniquely formulated to provide high reflectivity,low thermal conductivity, and UV resistance for extreme weather conditions.

Features:

1.Radiation protection hood (light shutters) structural design, effectively reducing the measurement error caused by intense light.

2.Light shutter box design, suitable for outdoor use.

3.High precision, good consistency, fast response, strong anti-interference ability, and good product protection performance.

4.Fast response, high precision, wide range, and good stability.

5.Compact, easy to disassemble and easy to install.

6.Low power consumption, energy saving and security.

7.RS485 digital interface, user-friendly.

Technical parameter:

Temperature: Measurement range: - 40°C~+123.8°C; Resolution: 0.1°C; Accuracy: ± 0.2°C.

Relative humidity: Measurement range: 0~100%; Resolution: 1%; Accuracy: ±3%

3.3 Light sensor

WXA400 light sensor is used to measure the total solar radiation with a spectral range of 0.3-3μm.It can also be used to measure the solar radiation incident on the slope.If the sensor faces downward, the reflected radiation can be measured.If a shading ring is added,the scattered radiation can be measured.Therefore, it can be widely used in solar energy utilization,weather,agriculture,building materials aging and air pollution and other departments to do solar radiation energy measurement.

Light sensor

Technical parameter: 1.Sensitivity :7-14μVW/m-2 2.Response time :<30s 3.Spectral range:0.3~3μm 4.Measurement range:0 ~ 2000W/m2 5.Accuracy:<5%

3.4  Rainfall sensor

The rainfall sensor uses the principle of piezoelectric induction, consisting of a stainless steel cover that senses rainfall and a piezoelectric sensor on the bottom of the cover. The size and number of raindrops is proportional to the signal, so it can be converted into rainfall, not the vibration generated by raindrops,but filtered by a filter.

Technical parameters:1.Power supply:12-24vdc 2.Power consumptionr: 10mA 3.Sensitivity:0.01mm 4.The work temperature: -40℃ ---80℃output: 5.Precision:<±4%

Rainfall sensor

3.5 Surface temperature sensor

The infrared surface temperature sensor is a high-precision infrared temperature sensor. It can perform uninterrupted measurements in field conditions. It consists of a thermopile (used to measure surface temperature) and a thermistor (used to measure the temperature of the sensor itself). Both temperature probes are placed in a Inside a wrapped aluminum tube, the catheter contains a tanning mirror. Thermopiles and thermistors output millivolt voltage signals. Measure the millivolt voltage signal and use the Stefan-Boltzman equation to correct the effect of the sensor's own temperature on the measured target temperature.

Technical Parameters:1.Measurement range: - 60°C~+150°C; 2.Resolution: 0.1°C; 3.Accuracy: ± 0.5°C.

3.6 Soil temperature and humidity sensor

The soil temperature sensor adopts imported high-precision temperature sensor, which has the characteristics of high measurement accuracy and good stability. Small size, easy installation, strong anti-interference ability.The soil moisture sensor uses the electromagnetic pulse principle to measure the apparent permittivity of the soil to obtain the true moisture content of the soil. It has the characteristics of rapid and accurate, high precision, free from the impact of chemical fertilizers and metal ions in the soil.

3.7 CO2 concentration sensor

WXA500 series CO2 electrochemical gas sensor has the advantages of high measurement accuracy and good stability.

Technical Parameters:1.Range 0~2000 ppm; 2.Accuracy ±3%FS(25°C) 3.Resolution: 0.1ppm

3.8 SO2 concentration sensor

The SO2 concentration sensor is based on the principle of electrochemistry and utilizes the measured gas to generate a corresponding oxidation-reduction reaction on the working electrode and the counter electrode of the sensor and to release a charge. A current is formed by the external circuit. The current is proportional to the gas concentration, thereby realizing the target gas. Quantitative measurement.

Technical Parameters:1.Monitoring range: 0 to 20 ppm; 2.Maximum monitoring concentration: 150ppm; 3.Sensitivity: 0.4±0.2μA/ppm 4.Resolution: 0.1ppm

4.Weather background software

The background data processing device includes a data receiving server,a database and data processing software.The data processing software mainly completes the data receiving,storage and analysis of various wind speed and direction monitoring points and manages the database. Exceeding the set alarm threshold for alarm and display.The main features include:

4.1 live data browsing

At the same time, accurate and real-time graphical display of all current measuring conditions,including temperature,humidity,rainfall,soil temperature and humidity values.

Single point real-time data display

4.2 Historical data retrieval query

It can record data of temperature,humidity,rainfall,soil temperature,soil moisture,carbon dioxide and sulfur dioxide at all measuring points within a year and can export historical data through mobile devices.

Historical date display

The historical data of the measuring point within the selected time period can be retrieved through the time period.With the function of searching data by measuring points.Have the ability to meet the joint search of time periods and numbering points.

Joint search of data

4.3 Data curve function

Provides all parameters real-time curve and history curve function.The real-time curve reflects the wind speed and direction change curve within 24 hours.The history curve is based on the selection of measuring points,time periods,generating curves and can simultaneously display the parameter curves of temperature,humidity,rainfall, soil temperature,soil moisture and the like of all the measuring points in different colors.

Data curves

4.4 Alarm function

The software has the functions of temperature,humidity,rainfall,soil temperature,soil moisture and harmful gas concentration alarm.When the instantaneous value exceeds the set alarm threshold, the software monitors the interface in real time and alarms through different colors.

Alarm date

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