Tubular soil moisture analyzer test method
I. Introduction of tubular soil moisture analyzer
As a major agricultural country in the world, it is especially important to implement water-saving irrigation and seek efficient soil moisture rapid measurement technology. China's population accounts for 22% of the world's population, while freshwater resources account for only 8% of the world's total. The per capita water resources are only 2,300 cubic meters per year, which is only equivalent to 1/4 of the world's per capita. It is the world's most per capita water resources. One of the 13 poor countries. On the one hand, China's water resources are very poor, and on the other hand, waste is very large. Agricultural water accounts for more than 80% of total social water consumption, but its effectiveness is very poor. At present, China's annual irrigation water consumption is about 380 billion cubic meters, the effective utilization rate is only 30% to 40%, while the advanced countries have reached 70% to 80%. China's grain production capacity per cubic meter of water is less than 1 kilogram. Up to 2. 35 kg. One of the reasons for this situation is that there is no effective soil moisture measurement technology to ensure the implementation of water-saving agricultural technology system, so it is more urgent to research and develop a rapid measurement technology of soil moisture suitable for popularization in production. .
Second, product features:
1. The use of soil dielectric properties to measure soil moisture is an effective, fast, simple and reliable method. The dielectric properties of soil are widely used in the measurement of soil water content, and the specific implementation methods vary widely. Among them, the high frequency capacitance probe measures soil water content, time domain reflectometry (TDR-Time Domain Reflectometry), time domain propagation method (TDT-Time Domain Transmission), frequency domain decomposition method (FD-Frequency DomainDecomposition), standing wave method (SWR) Measurement methods such as -Standing Wave-Ratio) are soil moisture measurement methods based on soil dielectric properties. Among them, the tubular soil moisture sensor utilizes a high-frequency electronic technique based on the standing wave principle for measuring the soil volumetric water content of different depth profiles at the same location by measuring the apparent dielectric constant of the soil. The sensor was not in direct contact with the soil during the measurement and was inserted into a PVC conduit buried in the soil for measurement. The tubular soil moisture sensor outputs 0-2. 5V analog voltage signal, output voltage V and soil volume water content o. The calibration equation is met: the coefficients of the equation can be determined by soil calibration tests. In order to carry out mobile measurement in the field, a special test instrument is required for use in order to quickly read the measurement results to meet different depth profiles of the soil at different monitoring points in the field (pre-embedded PVC test tube in the field) Requirements for rapid moisture testing.
2. Since the tubular soil moisture sensor outputs a standard voltage signal, it can be connected to various data collectors, data acquisition cards, data acquisition modules and other devices with differential inputs. The user can program the voltage value into soil volume. Water content. Soil moisture monitoring system can be constructed through system integration to monitor soil moisture in real time. The various general-purpose analog acquisition devices mentioned above have simple hardware system integration, but this method needs to be connected to a computer, and the device needs to be powered by a fixed power source, so it is only suitable for fixed monitoring and cannot be used for portable mobile measurement. Moreover, since these existing devices on the market are general-purpose devices, the cost is high and the volume is large, and the user cannot provide an intuitive operation interface for measuring soil moisture, which is inconvenient to use. Therefore, the moisture tester used in conjunction with the tubular soil moisture sensor is currently in a blank state in the related technical field in China.
Third, the operation method:
The soil moisture tester obtained according to the technical scheme of the present invention is an intelligent new type meter matched with the tubular soil moisture sensor, and the current tubular soil moisture sensor is used in the test range and interface of the power supply and the analog signal. More matching, compared with various data acquisition devices commonly used in the market, it has the following characteristics:
1. It can be well connected with the tubular soil moisture sensor through the sensor interface, and is also compatible with the needle soil moisture sensor;
2. Using a circuit implementation scheme different from the prior art, by providing an independent microcontroller unit, a powerful central control structure can be provided. As a core part of the system, the microcontroller can complete the calculation and control of the system and implement the program. Operation management, data storage, and control of peripheral interface circuits, etc.;
3. By adopting an independent digital-to-analog conversion circuit, the resolution of digital-to-analog conversion is improved, and higher measurement accuracy is ensured;
4. By using the power supply control circuit, a rechargeable battery, and a power supply structure of the charging circuit, the tester can not only perform fast charging on its own, but also can combine real-time demand regulation and voltage conversion of the power output with the microcontroller; The scheme of the micro control unit enables the tester to be used as a portable mobile measurement tool independently from the upper PC and the fixed power supply, and the user can move the measurement by moving the handheld instrument at different test points in the field;
5. By setting up an independent data memory, it can provide a large-capacity data storage function, and the real-time clock system can simultaneously save the measurement depth and measurement time related to the measurement result;
6. By setting the input and output system structure of a liquid crystal display, a state indicating circuit and a keyboard circuit, the tester can be extremely conveniently used in the measurement process, making the data output interface more friendly, and the input operation is more convenient and realized. The function is more abundant; the meter's display provides more information, not only can display the soil moisture reading, but also can display the measurement depth, system time, battery status, and can view the saved history;
7. Data communication can be performed with the host PC through the communication interface circuit. The user can modify the calibration equation parameters of the instrument through the host computer software to meet the needs of measuring soil of different textures.
Tubular soil moisture temperature monitor / multi-layer soil monitoring system
Product model: JZ-BJJZ12
Product specification parameters:
1. Measurement of soil temperature: -55 ° C ~ +125 ° C;
Measurement accuracy: ±0.5 °C;
2, soil moisture (volume water content) measurement range: dry soil ~ water saturated soil
Measurement accuracy: ±2% (provided with local soil sample calibration)
3. Communication method:
GPRS/CDMA 1X wireless communication (mobile, China Unicom, Telecom full network support)
RS232 communication
CAN communication, communication distance: more than 500 meters
4, power supply mode: built-in lithium iron phosphate battery power supply or external power supply
5. Dimensions: 63mm in diameter, the length varies with the number of sensors.
6, operating environment: -20 ° C ~ 85 ° C;
7, the shell protection level: the ground part: IP67; below the ground: IP68
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