CN209841608U - Irrigation water viscosity coefficient detection device based on magnetostrictive displacement sensor - Google Patents

Abstract

A detection device for the viscosity coefficient of irrigation water based on a magnetostrictive displacement sensor belongs to the technical field of detection of the viscosity coefficient of liquid, and includes a triangle iron stand, a magnetostrictive displacement sensor, a temperature sensor, a measuring cylinder, a pressure sensor, and a data processing and display device. The utility model is equipped with a temperature sensor and a pressure sensor to measure the temperature and density, and the influence of the two on the experimental measurement results is considered, and the experimental results are further corrected, and the accuracy is greatly improved. The limitations are greatly reduced, and the metal probe rod of the magnetostrictive displacement sensor can be measured after being immersed in the liquid to a certain depth. As long as this condition is met, any liquid can be measured anywhere. Magnetostrictive displacement sensor outputs continuous signal, compared with pulse signal, it is stable, fast in response, high in precision, good in portability, and easy to connect with data processing and display devices.

Description

Irrigation water viscosity detection device based on magnetostrictive displacement sensor

technical field

The utility model belongs to the technical field of detection of the viscosity coefficient of irrigation water, in particular to a detection device for the viscosity coefficient of irrigation water based on a magnetostrictive displacement sensor.

Background technique

The increasingly acute contradiction between supply and demand of water resources has accelerated the government's comprehensive agricultural water price reform plan. In 2016, the State Council issued a number of opinions on promoting the comprehensive reform of agricultural water prices, which proposed to improve agricultural irrigation water metering facilities, speed up the construction of water supply metering systems, and realize metered water supply for all key projects in large and medium-sized irrigation areas. The implementation of water-based charging in irrigation areas is conducive to promoting the scientific and rational use of water resources and improving the efficiency of agricultural water use. The research and development of scientific and practical water metering facilities is a key link in realizing the goal of water conservation in irrigation areas. In the research and development of water metering facilities in irrigation areas, when constructing mathematical models through numerical simulation software, it is necessary to accurately input the viscosity coefficient of irrigation water. This parameter is very important to ensure the accuracy of mathematical model calculations and the reliability of research results.

The viscosity coefficient is an important physical quantity to describe the internal friction properties of liquids. It characterizes the ability of a liquid to resist deformation, and it is only manifested when there is relative motion in the liquid. Studying and measuring the viscosity coefficient of liquid plays an important role not only in material science research, but also in engineering technology and other fields. He has made great contributions in the fields of fluid mechanics and chemical engineering principles, and these disciplines are closely related to the viscosity coefficient from the beginning to the end. The measurement of the viscosity coefficient is also needed in the numerical simulation of the flume in the field of hydraulic engineering. The current research results in this field are patented by Wu Bin et al. of Beijing University of Technology, whose patent application number is 201210248592.X, and the patent name is liquid viscosity detection device and method based on ultrasonic guided waves. This patent has the following disadvantages: 1. The output signal is a pulse signal, and its response speed is slow, not accurate enough and stable enough. 2. Multiple detection devices cannot realize automatic detection, and the operation is cumbersome. The devices cannot directly measure liquid parameters closely related to the viscosity coefficient of the liquid, such as physical parameters such as the density of the liquid. 3. If the frequency of the signal is too high, it will cause signal drift and reduce the stability of the device. 4, the probe rod length of its device is up to 1 meter, and the device volume is clumsy.

Therefore, there is an urgent need for a novel technical solution in the prior art to solve this problem.

Utility model content

The technical problem to be solved by the utility model is: to provide a detection device for the viscosity coefficient of irrigation water based on a magnetostrictive displacement sensor to solve the problem of slow response speed and cumbersome operation of the liquid viscosity detection method using ultrasonic guided waves in the prior art. , poor device stability and other technical problems.

The detection device for the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor includes a triangle iron stand, a magnetostrictive displacement sensor, a temperature sensor, a measuring cylinder, a pressure sensor and a data processing and display device, and one side base of the triangle iron stand is a permanent magnet base , the bracket of the triangle iron stand is flexibly connected to the upper part of the magnetostrictive displacement sensor; the upper part of the permanent magnet base is fixedly equipped with a tray, and a pressure sensor is arranged between the permanent magnet base and the tray; the measuring cylinder is placed on the upper part of the tray, and the measuring cylinder The liquid to be tested is contained inside; the metal probe rod of the magnetostrictive displacement sensor extends into the liquid to be tested, and a permanent magnet magnetic ring is arranged on the metal probe rod; the temperature sensor is placed in the liquid to be tested; data processing and display The device includes a single-chip microcomputer, a weight transmitter, a power module and a display device, and the data processing and display devices are respectively connected with a magnetostrictive displacement sensor, a temperature sensor and a pressure sensor; connect.

A scale line is arranged on the bracket of the triangle iron stand.

The data processing and display device is provided with a main power line, a power indicator light, a data transmission port, a magnetostrictive displacement sensor data transmission bus, a temperature sensor data transmission bus and a pressure sensor data transmission bus.

The display device is an LCD1602 liquid crystal display.

The power module is a 220V AC to 24V DC switching power supply.

The single-chip microcomputer is an Arduino UNO model single-chip microcomputer.

The liquid to be tested is irrigation water.

Through the above design scheme, the utility model can bring the following beneficial effects:

The utility model is based on a magnetostrictive displacement sensor and takes the detection of the energy attenuation coefficient of the liquid as the main idea to manufacture a detection device for the viscosity coefficient of the liquid. The magnetostrictive displacement sensor collects signals by immersing in liquid. For better measurement results, the collected signals are transmitted to the data processing and display device for data processing, and are equipped with LCD liquid crystal display for real-time digital display. To ensure detection For the correctness of the results, set the pressure sensor and temperature sensor to detect the temperature and density, so that the experimental results are more accurate, and the automatic display is realized through the LCD liquid crystal display. The magnetostrictive displacement sensor outputs a continuous voltage signal, which has the advantages of accurate measurement and stable signal.

The utility model has four advantages:

1. The device is equipped with a temperature sensor and a pressure sensor to measure temperature and density. Considering the influence of the two on the experimental measurement results, the experimental results are further corrected, and the accuracy is greatly improved.

2. The limitations are greatly reduced. The metal probe rod of the magnetostrictive displacement sensor can be measured at a certain depth in the liquid. As long as this condition is met, it can not only be used to measure irrigation water, but also any liquid and any place can be measured.

3. The magnetostrictive displacement sensor outputs continuous signals, which are more stable than pulse signals, with fast response speed, high precision, good portability, and easy connection with data processing and display devices.

4. The device has good portability and is easy to connect with 21Arduino.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described:

Fig. 1 is a structural schematic diagram of the detection device for the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor of the present invention.

Fig. 2 is a structural block diagram of the data processing and display device in the irrigation water viscosity coefficient detection device based on the magnetostrictive displacement sensor of the utility model.

Fig. 3 is a schematic diagram of the magnetostrictive displacement sensor in the irrigation water viscosity coefficient detection device based on the magnetostrictive displacement sensor of the present invention.

Fig. 4 is an enlarged view of the deformation of the waveguide wire in the device for detecting the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor of the present invention.

Fig. 5 is a block diagram of the data processing flow of the data processing and display device in the irrigation water viscosity coefficient detection device based on the magnetostrictive displacement sensor of the present invention.

Fig. 6 is a signal diagram of the irrigation water detected by the magnetostrictive displacement sensor in the embodiment of the device for detecting the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor of the present invention.

Fig. 7 is a signal diagram in the air detected by the magnetostrictive displacement sensor in the embodiment of the detection device for the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor of the present invention.

Fig. 8 is a signal diagram of the temperature sensor in the embodiment of the detection device for the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor of the present invention.

Fig. 9 is a signal diagram of the pressure sensor in the embodiment of the detection device for the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor of the present invention.

In the figure, 1- triangle iron stand, 2- magnetostrictive displacement sensor, 3- temperature sensor, 4- measuring cylinder, 5- pressure sensor, 6- data processing and display device, 7- tray, 8- main power line, 9- Power indicator light, 10-data transmission port, 11-magnetostrictive displacement sensor data transmission bus, 12-temperature sensor data transmission bus, 13-pressure sensor data transmission bus, 14-sensor electronic warehouse, 15-magnetic ring, 16- Damper, 17-waveguide wire, 18-power supply positive pole, 19-power supply negative pole, 20-signal output positive pole, 21-signal output negative pole, 22-housing ground wire.

Detailed ways

As shown in the figure, the detection device for the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor includes a triangle iron stand 1, a magnetostrictive displacement sensor 2, a temperature sensor 3, a measuring cylinder 4, a pressure sensor 5, and a data processing and display device 6. The side base of the triangle iron stand 1 is a permanent magnet base, and the support of the triangle iron stand 1 is flexibly connected with the top of the magnetostrictive displacement sensor 2; A pressure sensor 5 is arranged between them; the measuring cylinder 4 is placed on the upper part of the tray 7, and the liquid to be measured is contained in the measuring cylinder 4; the metal probe rod of the magnetostrictive displacement sensor 2 extends into the liquid to be measured, and the metal probe rod is set There is a permanent magnet magnetic ring; the temperature sensor 3 is placed in the liquid to be measured; the data processing and display device 6 includes a single-chip microcomputer, a weight transmitter, a power module and a display device, and the data processing and display device 6 is provided with a main power line 8. Power indicator light 9, data transmission port 10, magnetostrictive displacement sensor data transmission bus 11, temperature sensor data transmission bus 12 and pressure sensor data transmission bus 13, data processing and display device 6 is connected to computer through data transmission port 10 , data processing and display device 6 are connected with magnetostrictive displacement sensor 2 by magnetostrictive displacement sensor data transmission bus 11, data processing and display device 6 are connected with temperature sensor 3 by temperature sensor data transmission bus 12, data processing and display device 6 is connected to the pressure sensor 5 through the pressure sensor data transmission bus 13; the single-chip microcomputer is respectively connected to the weight transmitter, the power module and the display device. The data processing and display device 6 has laid the foundation for the realization of the two functions of data processing and real-time display. The single-chip microcomputer converts all analog signals into digital signals and connects them to display devices such as LCD1602 liquid crystal display for real-time display. The transmission port 10 transmits to the computer, and it is convenient and clear to watch the waveform and the specific value of the data through MATLAB.

The bracket of the triangle iron stand 1 is provided with scale lines.

The display device is an LCD1602 liquid crystal display.

The power module is a 220V AC to 24V DC switching power supply.

The single-chip microcomputer is an Arduino UNO model single-chip microcomputer.

Based on the magnetostrictive displacement sensor irrigation water viscosity detection method, using the magnetostrictive displacement sensor irrigation water viscosity detection device, including the following steps, and the following steps are carried out sequentially,

Step 1, place the empty measuring cylinder 4 on the tray 7, turn on the power, the pressure sensor 5 detects the pressure value of the empty measuring cylinder 4 and converts it into the mass value of the empty measuring cylinder through the weight transmitter and the single-chip microcomputer and stores it in the single-chip microcomputer;

Step 2: inject irrigation water into the measuring cylinder 4, read the surface value of the irrigation water, and input it to the data processing and display device 6 to obtain the volume value of the irrigation water, and the pressure sensor 5 detects the pressure value after the irrigation water is injected and transmits it by weight The quality value of the measuring cylinder and irrigation water is converted into the measuring cylinder and the single-chip microcomputer and stored in the single-chip microcomputer;

Step 3, obtain the frequency domain amplitude of the echo signal frequency in the air through the magnetostrictive displacement sensor 2;

Step 4, put the magnetostrictive displacement sensor 2 into the irrigation water, and fix it with the triangle iron stand 1, read the value of the liquid level to be measured and the plane where the lower bottom surface of the metal probe rod is located according to the scale line set on the triangle iron stand 1 value, take the difference between the two values to obtain the depth l of the metal probe rod;

Step 5, obtain the frequency domain amplitude value of the echo signal frequency in the irrigation water through the magnetostrictive displacement sensor 2;

Step 6, obtain the irrigation water energy attenuation coefficient coefficient according to the frequency domain amplitude value of the echo signal frequency obtained in the air, the frequency domain amplitude value of the echo signal frequency in the irrigation water, the metal probe rod moistening depth l and the liquid attenuation coefficient calculation formula;

Step 7, according to the quality value of the empty graduated cylinder obtained in step 1 and the quality value of the graduated cylinder and irrigation water obtained in step 2, the difference is obtained to obtain the quality value of irrigation water,

According to the quality value of the irrigation water and the volume value of the irrigation water obtained in step 2, the density ρ _l of the irrigation water is obtained;

Step 8. Look up the table according to the metal type of the metal probe rod, obtain the density ρ _r of the metal probe rod and the property G of the metal probe rod, and obtain the shear wave velocity c _r according to the shear wave velocity formula,

Use a spiral micrometer to measure the radius of the metal probe rod,

The excitation frequency was measured by an oscilloscope,

According to the density ρ _l of the irrigation water and the density ρ _r of the metal probe rod, the dimension-density ρ can be obtained through the dimension-density ρ formula: ρ=ρ _l /ρ _r ;

Step 9, according to the liquid viscosity coefficient formula, obtain the viscosity coefficient of irrigation water;

Step ten, obtain the temperature of the irrigation water through the temperature sensor 3 and keep the temperature constant, repeat steps three, five and nine to obtain the viscosity coefficient of the irrigation water, take the average value of the viscosity coefficient of the irrigation water, and the average value is the viscosity coefficient of irrigation water at this temperature.

The formula for calculating the liquid energy attenuation coefficient α is:

In the formula, α(f) is the energy attenuation coefficient; l is the penetration depth of the metal probe; F _a (f) is the frequency domain amplitude of the echo signal frequency in the air; F _f (f) is the echo at the penetration depth l The frequency-domain magnitude of the frequencies in the signal.

The calculation formula of the liquid viscosity coefficient η is as follows:

In the formula, η is the liquid viscosity coefficient; cr is the shear wave velocity; _γ is the radius of the metal probe; f is the excitation frequency; α is the energy attenuation coefficient; ρl is the irrigation water density; ρ is the dimension—density.

Fundamental:

1. Magnetostriction

The magnetostrictive effect refers to the reversible change of the geometric size of the magnetic material due to the change of the external magnetic field during the magnetization process. The magnetostrictive smart material is a kind of material with strong magnetostriction effect and high magnetostriction coefficient, that is to say, it is a kind of material with the mutual conversion function of electromagnetic energy and mechanical energy. Magnetostrictive materials are usually divided into two categories: metal magnetostrictive materials and rare earth-iron (RFe2) giant magnetostrictive materials. Since the rare earth-iron (RFe2) giant magnetostrictive material has a much larger magnetostrictive value than traditional magnetostrictive materials, and has fast mechanical response, high power density, and high coupling coefficient, it has a good role in the field of smart materials. Application prospect. At present, this kind of material has been widely used in sonar systems, high-power ultrasonic devices, precision positioning control, mechanical brakes, various valves and driving devices, etc.

2. Magnetostrictive displacement sensor

The magnetostrictive displacement sensor 2 is a high-precision, large-range sensor made based on the magnetostrictive effect to measure displacement, and its working principle is shown in FIG. 3 . Its internal structure includes sensor electronic compartment 14, magnetic ring 15, damper 16, and waveguide wire 17. The positive pole 18 of the power supply of the magnetostrictive displacement sensor 2 is a brown line, the negative pole 19 of the power supply is a black line, and the positive pole 20 of the signal output is a blue line. , The signal output negative electrode 21 is a white wire, and the housing ground wire 22 is a shielded wire. The sensor electronic warehouse 14 includes a pulse generator, a digital processing module and a detection element. The magnetic ring 15 is a permanent magnet magnetic ring.

When the magnetostrictive displacement sensor 2 was working, the electronic components in the sensor electronic compartment 14 produced excitation pulses, and the excitation pulses propagated at the electromagnetic wave speed along the waveguide wire 17 manufactured by magnetostriction in the sensor, and the direction perpendicular to the waveguide wire 17 produced a ring direction. The magnetic field propagates at the speed of sound equally, and there is a permanent magnet magnetic ring 15 on the metal probe rod (comprising the waveguide wire 17 and the loop wire) of the magnetostrictive displacement sensor 2, and the magnetic ring 15 itself also has a magnetic field, and the two magnetic fields intersect to generate a magnetostrictive effect. The waveguide wire 17 is deformed, and at the same time, the waveguide wire 17 generates a strain pulse in the form of mechanical vibration and propagates along the metal probe rod to both ends at the speed of sound. The specific position of the magnetic ring 15 can be obtained by multiplying the total time from the moment when the excitation pulse is sent to the detection of the detected original by the speed of sound propagating in the solid. This process is continuous, so whenever the position of the magnetic ring 15 changes, the new position will be measured quickly. Since the output signal of the detection circuit is a true absolute value, rather than a proportional or re-amplified signal, there is no signal drift or value change, and it is not necessary to remark regularly like other sensors.

3. The basic principle of magnetostrictive displacement sensor 2 to measure the viscosity coefficient of liquid

After the magnetostrictive displacement sensor 2 is powered, the signal terminal outputs a continuous signal. Since the output signal is a true absolute value, no further amplification is required. The voltage range is 0-+5V, and the value depends on the position of the magnetic ring 15 , is a constant value. When measuring the viscosity coefficient of a liquid, the magnetic ring 15 needs to be fixed on a certain position within the effective working range of the metal probe rod, and the metal probe rod is immersed in the liquid. The magnetic ring 15 must be completely immersed in the liquid. Under normal circumstances, the energy attenuation is almost zero in the air. Compared with the air, the metal probe spreads in the liquid and spreads around with the liquid, so there is energy attenuation, resulting in a decrease in the propagation speed, making the detection time of the detection element change. Large, the output voltage value of the detection element increases, and the energy attenuation coefficients of liquids with different viscosity coefficients are different. Measure the voltage amplitude in the two ways, and the liquid energy attenuation coefficient can be calculated by the calculation formula of the liquid energy attenuation coefficient α, and then by The liquid viscosity coefficient η calculation formula calculates the liquid viscosity coefficient, and the single-chip computer calculates the result, which can be displayed in real time on the LCD1602 liquid crystal display, and the data transmission port 10 can be connected to a computer, and the display of waveforms and values can be easily realized by using MATLAB.

4. Basic principles of data processing and display modules

The magnetostrictive displacement sensor 2 and the temperature sensor 3 transmit the 0~5V voltage signal to the Arduino UNO single-chip microcomputer, which are respectively connected to the A2 and A1 ports of the single-chip microcomputer. The pressure sensor 5 is amplified by the weight transmitter, and connected to The A0 port of the single-chip microcomputer, the single-chip microcomputer converts the analog signals of the three sensors into digital signals, and then corrects and calculates these digital signals. The LCD1602 liquid crystal display screen connects each port with the single-chip microcomputer and displays the measurement results. 220V The AC to 24V DC switching power supply is used to convert the 220V power supply into a 24V power supply that we can use directly to supply power to the entire data processing and display device 6 . The program flow chart of the Arduino UNO MCU is shown in Figure 5.

Specific steps:

Fix the magnetostrictive displacement sensor 2 on the triangle iron stand 1, fix the magnetic ring 15 in the normal working area of the metal probe rod, put the metal probe rod into the inside of the measuring cylinder 4, put the liquid to be measured into the measuring cylinder 4, and fix the liquid Bit height, the power supply module supplies power to the single-chip microcomputer, and the magnetostrictive displacement sensor 2 sends an excitation pulse inside. The pulse propagates forward along the waveguide at the electromagnetic wave speed, and at the same time generates a circular magnetic field perpendicular to the wire. Liquids with different viscosity coefficients will produce energy attenuation. Due to the difference in viscosity coefficient, the energy attenuation degree is also different. When meeting the magnetic field generated by the magnetic ring 15 in the magnetostrictive displacement sensor 2, magnetostriction occurs. The waveguide wire 17 is elongated or shortened to generate a strain pulse. The secondary strain pulse is a mechanical wave propagating along the metal probe rod to both ends at the speed of sound, one end is absorbed by the damper 16, and the other end is the original detection signal inside the magnetostrictive displacement sensor 2 It was detected that compared with the air, the metal probe rod propagating in the liquid will diffuse with the liquid to the surroundings, resulting in energy attenuation, resulting in a decrease in the propagation speed, and the energy attenuation in the air is almost zero, and the echo in the liquid and in the air is collected The frequency domain amplitude of the signal frequency can be used to calculate the value of its attenuation coefficient and viscosity coefficient.

The calculation formula of liquid energy attenuation coefficient α is as follows:

In the formula, α(f) is the energy attenuation coefficient; l is the penetration depth of the metal probe; F _a (f) is the frequency domain amplitude of the echo signal frequency in the air; F _f (f) is the echo at the penetration depth l The frequency-domain magnitude of the frequencies in the signal.

The calculation formula of liquid viscosity coefficient η is as follows:

In the formula, η is the liquid viscosity coefficient; cr is the shear wave velocity; _γ is the radius of the metal probe; f is the excitation frequency; α is the energy attenuation coefficient; ρ _l is the irrigation water density; ρ is the dimension—density .

According to the metal type look-up table of the metal probe, the density ρ _r of the metal probe and the property G of the metal probe are obtained, and the shear wave velocity c _r is obtained according to the shear wave velocity formula,

Use a spiral micrometer to measure the radius of the metal probe rod,

The excitation frequency was measured by an oscilloscope,

According to the density ρ _l of irrigation water and the density ρr of the metal probe rod, the dimension-density ρ can be obtained through the dimension-density ρ formula: ρ=ρ _l /ρ _r .

Example:

Experiment content: Measuring the viscosity coefficient of irrigation water

This detection method is by using two different magnetic fields (one of these two magnetic fields comes from the permanent magnet in the magnetic ring 15, and the other comes from the excitation pulse generated by the electronic components in the sensor electronic chamber 14 along the waveguide made of magnetostrictive material in the sensor. The wire 17 runs at the speed of sound.) After the strain pulse signal generated when intersecting is captured by the sensing circuit of the sensor electronic warehouse 14, it is output in the form of an electrical signal, and the irrigation water with different viscosity coefficients encountered in the excitation pulse propagation, its corresponding The energy attenuation coefficient is different, and the different energy attenuation coefficients of irrigation water with different viscosity coefficients are measured, and the corresponding viscosity coefficient can be obtained through calculation and processing.

6 to 9 are the signal diagrams of the irrigation water detected by the magnetostrictive displacement sensor, the signal diagrams of the air detected by the magnetostrictive displacement sensor, the temperature sensor signal diagram and the pressure sensor signal diagram. The experimental data obtained through testing are as follows:

Error Analysis:

a. Calculate the average value of multiple measurements to reduce the experimental error

The average value of the measured value is 1.0643MPa.s

b. Calculate the variance of the viscosity coefficient

The variance of the measured values is 2.1549e-15. The smaller the variance value, the more concentrated the experimental data, indicating that the stability of the device is good and the reliability of the data is strong.

c. Conclusion:

For irrigation water, when the temperature is 17.20℃, the density is 1000Kg/m ³ and the viscosity coefficient is 1.0643MPa.s.

Claims (6)

1. Based on the magnetostrictive displacement sensor irrigation water viscosity detection device, it is characterized in that: comprising a triangle iron stand (1), a magnetostrictive displacement sensor (2), a temperature sensor (3), a measuring cylinder (4), a pressure sensor ( 5) and data processing and display device (6), the side base of described triangle iron stand (1) is a permanent magnet base, and the support of triangle iron stand (1) is movably connected with the top of magnetostrictive displacement sensor (2); The top of the permanent magnet base is fixedly equipped with a tray (7), and a pressure sensor (5) is arranged between the permanent magnet base and the tray (7); the measuring cylinder (4) is placed on the top of the tray (7), and the measuring cylinder (4 ) contains the liquid to be measured; the metal probe rod of the magnetostrictive displacement sensor (2) extends into the liquid to be measured, and the metal probe rod is provided with a permanent magnet magnetic ring; the temperature sensor (3) is placed in the liquid to be measured In the liquid; the data processing and display device (6) includes a single-chip microcomputer, a weight transmitter, a power module and a display device, and the data processing and display device (6) are respectively connected with the magnetostrictive displacement sensor (2), the temperature sensor (3) and the The pressure sensor (5) is connected; the single-chip microcomputer is respectively connected with the weight transmitter, the power module and the display device. 2. The device for detecting the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor according to claim 1, characterized in that: the bracket of the triangle iron stand (1) is provided with a scale line. 3. The detection device for irrigation water viscosity coefficient based on magnetostrictive displacement sensor according to claim 1, is characterized in that: said data processing and display device (6) is provided with main power line, power indicator light, data transmission port, magnetostrictive displacement sensor data transmission bus, temperature sensor data transmission bus and pressure sensor data transmission bus. 4. The device for detecting the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor according to claim 1, characterized in that: the display device is an LCD1602 liquid crystal display. 5. The device for detecting the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor according to claim 1, characterized in that: the power module is a 220V AC to 24V DC switching power supply. 6. The device for detecting the viscosity coefficient of irrigation water based on the magnetostrictive displacement sensor according to claim 1, wherein the single-chip microcomputer is an Arduino UNO type single-chip microcomputer.