32results about How to "Meet the range" patented technology

The invention provides a polyethylene composition and a preparation method thereof. The polyethylene composition comprises a polyethylene blend, inorganic filler, a coupling agent, a dispersant and fully-vulcanized powder rubber and is used for preparing film materials such as waterproof gas-permeable film. The polyethylene blend comprises three linear low-density polyethylene with different melt indexes so as to ensure the performance of the waterproof gas-permeable film and the nano-scale fully-vulcanized powder rubber can have the effect of promoting the dispersion of the inorganic filler. The waterproof gas-permeable film is prepared from the polyethylene composition by casting and stretching, under the condition that the mechanical strength is ensured to be not reduced, the processing performance of the gas-permeable film can be significantly improved, the adjustable ranges of physical performance and permeability are large and the gas-permeable film has the advantages of wider adaptability, uniform micropores, low cost and high cost-performance ratio.

The invention relates to a tilt angle sensor based on optical fiber Bragg gratings and a method for measuring a tilt angle of the tilt angle sensor and belongs to the technical field of measurement of a structural tilt angle. The tilt angle sensor comprises a fixed base plate (12), a fixed pressing block (6), a thin-wall type uniform-section metal beam (9) and a quality block (7), wherein the upper end of the thin-wall type uniform-section metal beam (9) is arranged on the fixed base plate (12) in a mode of fitting with the fixed pressing block through a first movable pressing block (10) and a fifth screw (11); the quality block (7) is fixed at the lower end of the thin-wall type uniform-section metal beam (9) through a sixth screw (15) and a second movable pressing block (16); and a first optical fiber Bragg grating (13) and a second optical fiber Bragg grating (14) are respectively adhered to opposite positions on two sides of the thin-wall type uniform-section metal beam (9). By the method, the size and direction of the tilt angle can be detected according to a correspondence relation between the change of central wavelengths of the two optical fiber Bragg gratings and the tiltangle. The invention is high in measurement accuracy and has a temperature self-compensation function.

The invention provides an underwater three-dimensional detection gliding robot. The robot comprises an appearance system, an internal adjusting system, and a control system; the internal adjusting system and the control system are arranged in the inner side of the appearance structure; and the control system is used to communicate and control the internal adjusting system. The appearance system is in a streamline shape and is provided with a communication part, so that the system has the advantages of low energy consumption, strong autonomy and enduring performance, low maintenance cost, little dependence on mother ship, and capability of achieving cooperative work, and fully satisfy the requirements of large scale, long period, and large size on sea environment supervision. The internal adjusting system comprises a pitching adjusting part, a rolling adjusting part, and a floating force adjusting part so as to make the robot have two work states: a linear gliding and a spiral gliding, so that fixed point spiral covering type sea supervision and vertical cross-section zigzag cruising supervision can both be realized, and a tri-dimensional supervision from the horizontal level to the deep sea is actually achieved.

The embodiment of the invention discloses a method for shielding a wireless signal. The method includes the steps that (1) a monitoring unit receives a user instruction, wherein the user instruction is a modification instruction or an inquiry instruction; (2) the monitoring unit judges the user instruction, if the user instruction is the inquiry instruction, shielding parameters are fed back to a user, and if the user instruction is the modification instruction, the monitoring unit judges whether the modification instruction is in a manual control mode or an automatic control mode, if the modification instruction is in the manual control mode, a manual control process is started, a power control signal is transmitted to multiple frequency band shielding units, and if the modification instruction is in the automatic control mode, an automatic control process is started, and the power control signal is transmitted to the multiple frequency band shielding units; (3) the frequency band shielding units radiate shielding signals in multiple frequency bands according to the power control signal. According to the method, the shielding signals can be flexibly controlled, a wireless signal shielding device can be monitored in real time, the power level of the wireless signal shielding device can be accurately adjusted, dynamic upgrading can be achieved, wireless signals possibly occurring in the future can be shielded, and the signal shielding effect can be optimized.

The invention belongs to the field of pressure sensor design and manufacturing, and specifically discloses a flexible multi-range capacitive-type pressure sensor and a preparation method and an application thereof. The sensor comprises a flexible substrate, a multi-stage support island and a pressure sensitive film, which are sequentially arranged from bottom to top. The multi-stage support islandis composed of a central circular boss located at the middle of the pressure sensitive film, and n-stage annular bosses which are disposed on the pressure sensitive film and are concentrically arranged with the central circular boss. A top electrode is disposed between the central circular boss and the pressure sensitive film, and the heights of the n-stage annular bosses sequentially increase from the inside to the outside, wherein the outermost annular boss is attached to the flexible substrate. The bottom portion of the flexible substrate is provided with a bottom electrode directly belowthe central circular boss. The sensor provided by the invention has a wide range of pressure measurement while maintaining high sensitivity, and solves the contradiction between the range and sensitivity of the pressure sensor, and can meet the requirements of the pressure range and sensitivity of different wind tunnel tests.

An electromagnetically driven dislocation-type micromechanical variable light attenuator is composed of electromagnetic drive coil, base, two optical fibres, locating slot, movable platform, magnet and elastomer. Its advantages are simple structure, low insertion loss (lower than 1 db), high echo loss (greater than 60 db), wide dynamic range (greater than 50 db), and low cost.

Provided is a modified polypropylene composite pipe for protecting high-voltage cables. The modified polypropylene composite pipe is composed of a middle layer, an inner layer and an outer layer. The middle layer is a cylinder formed by weaving of metal wires, and the inner layer and the outer layer are formed by the fact that modified polypropylene composite materials are formed on the inner side face and the outer side face of the middle layer. The modified polypropylene composite materials are composed of, by weight, 80-86 parts of MPP resin, 8-12 parts of PP/SBS, 1-2 parts of PP color masterbatch and 1-8 parts of calcium carbonate. According to the modified polypropylene composite pipe for protecting the high-voltage cables, the modified MPP resin is the main raw materials of the inner layer and the outer layer of the pipe, the PP/SBS is used as MPP resin modified materials, the calcium carbonate is used as an auxiliary, so that the inner layer and the outer layer of the pipe can have enough strength, toughness, good corrosion resistance and good temperature resistance performance, the cylinder which is formed by weaving the metal wires is arranged in the pipe, so that the respective advantages of the metal materials and the modified MPP materials can be fully utilized, accordingly, the physical and mechanical properties of products are improved, and the damage resistance performance of the pipe in the mounting construction and using process is enhanced.

The invention discloses a temperature data acquisition device which comprises a plurality of temperature sensors, direct-current bridges, signal amplification circuits, a multi-path analog switch, an A/D converter, a single chip microcontroller and a data acquisition module, wherein the signal output ends of the temperature sensors are respectively connected with the signal input ends of the direct-current bridges, the signal output ends of the direct-current bridges are connected with the signal input ends of the corresponding signal amplification circuits, the signal output ends of the signal amplification circuits are connected with the signal input ends of the multi-path analog switch, the signal output end of the multi-path analog switch is connected with the signal input end of the A/D converter, the A/D converter is connected with the signal input end of the data acquisition module, the signal output end of the data acquisition module is connected with the signal input end of the single chip microcontroller, and the signal output end of the single chip microcontroller is connected with the signal input end of the multi-path analog switch. Three types of temperature measurement can be realized. The needs of different measurement ranges, different measurement accuracies and different occasions can be met.

Provided is a modified polypropylene composite tubular product for protecting a high-voltage cable. The modified polypropylene composite tubular product is composed of a middle layer serving as a framework and inner and outer layers, wherein the middle layer is a cylinder formed by extruding a metal wire woven mesh and a polyethylene material, and the inner and outer layers are formed by extruding a modified polypropylene material on the inner and outer sides of the middle layer. The modified polypropylene composite tubular product has the advantages that modified MPP resin serves as a main material for the inner and outer layers of the tubular product, PP/SBS serves as a modification material for the MPP resin, and calcium carbonate serves as a processing agent. Therefore, the inner and outer layers of the tubular product has enough strength and toughness, good corrosion resistance and temperature-resisting performance, and the cylinder formed by extruding the metal wire woven mesh and the polyethylene material and serving as the framework is arranged in the inside. Accordingly, the respective advantages of a metal material, a polyethylene material and a modified MPP material can be fully utilized, the physical mechanical performance of the product is comprehensively improved, and the damage resistance performance of the tubular product in the construction and usage process is enhanced.

The invention relates to a full-range soft switching method of an input-series output-paralleled phase-shifted full-bridge convertor, and belongs to the technical field of isolated type direct current-direct current convertors. The method includes the steps that one series LC network is connected into the position between the center point of a leading bridge arm upper tube and a leading bridge arm lower tube of a first phase-shifted full-bridge conversion module and the center point of a lag bridge arm upper tube and a lag bridge arm lower tube of a second phase-shifted full-bridge conversion module, the other series LC network is connected into the position between the center point of a lag bridge arm upper tube and a lag bridge arm lower tube of the first phase-shifted full-bridge conversion module and the center point of a leading bridge arm upper tube and a leading bridge arm lower tube of the second phase-shifted full-bridge conversion module, and then zero-voltage switching of MOSFETs is achieved. The method can automatically adapt to different input voltages, output voltages and loads. According to the method, full-range soft switching of the phase-shifted full-bridge convertor can be achieved, efficiency of the whole convertor is improved, the method is suitable for the occasion where high-voltage input is converted into low-voltage output, and the requirements for the wide input voltage range, the wide output voltage range and the wide load change range are met.

The invention relates to the technical field of vehicle hybrid power, and discloses a front and back drive continuous-speed-changing hybrid power assembly. The front and back drive continuous-speed-changing hybrid power assembly comprises a hybrid module, a pure electric module, a first transmission module and a second transmission module, the hybrid module transmits the power to the front wheelsof an automobile through the first transmission module, the pure electric module transmits the power to the back wheels of the automobile through the second transmission module, the first transmissionmodule and the second transmission module are arranged independently mutually, and the first transmission module and the second transmission module can realize the transformations of at least two gears respectively. The front and back drive continuous-speed-changing hybrid power assembly solves the problems of the high power consumption and the poor acceleration due to the fact that a motor in ahybrid power assembly without a speed-changing mechanism in the prior art often works in a low-efficiency area and in a over-fixed load for adapting to the torque and speed requirements in the vehicledriving process and the high software control difficulty and the poor gear shifting quality due to the fact that some hybrid power assemblies with speed-changing mechanisms still adopts a step gear shifting mechanism such as a clutch or a synchronizer.

The invention relates to a toilet bowl type liquid-spraying apparatus and application of the toilet bowl type liquid-spraying apparatus, which belong to the technical field of sanitary apparatus. The liquid-spraying apparatus comprises a shell which is fixed on a toilet bowl, wherein the inside of the shell is provided with a liquid receiving tank, a water injector provided with a spray rod, and a control device. The liquid-spraying apparatus also comprises a pump device, wherein the liquid receiving tank comprises at least two mutually separated tanks; a liquid inlet of one tank is externally connected with running water through a first control valve, and liquid inlets of other tanks are communicated with a liquid feed opening which is arranged on an upper shell; liquid outlets of the tanks are communicated with an inlet of the pump device through a second control valve; an outlet of the pump device is communicated with an inlet of the spray rod; and the first control valve and the second control valve are electrically connected with the control device respectively. The liquid-spraying apparatus has a plurality of functions except cleaning human body, so as to be capable of providing a unique application of performing physical therapy on diseases of private parts, anuses or buttocks of the human body.

The invention discloses a corrosion inhibitor for a closed soft water circulating cooling water system and an application. Anti-corrosion protection is carried out on thermal equipment, so that the service life of system equipment in a closed soft water circulating cooling water environment is effectively prolonged. The corrosion inhibitor has the characteristics of being efficient, phosphorus-free and environment-friendly. The corrosion inhibitor is characterized by comprising a steel corrosion inhibitor and a copper corrosion inhibitor, wherein the steel corrosion inhibitor comprises triethanolamine borate, ascorbic acid and urotropine; and the copper corrosion inhibitor comprises benzotriazole.

The invention relates to a power test load of a direct-current charger. The power test load comprises a 10-A voltage adjustable load module, a 5-A voltage adjustable load module, a 1-A voltage adjustable load module, a 0.5-A voltage adjustable load module and a 0.1-A Voltage adjustable load module. On the basis of the modular design, the heat dissipation mode is optimized; defects of tedious resistance process and high workload of the common resistor box are overcome; and accurate, efficient, and convenient effects are realized.

The invention proposes a large dynamic energy infrared target simulation system. The system is composed of a radiation source module, an optical system, a control module and supporting devices. The radiation source module includes a black body radiation source, a black body controller, a condenser lens, a light barrier, an attenuation film group and a light barrier group. The attenuator group includes attenuator A and attenuator B. The diaphragm group includes diaphragm A and diaphragm B. The optical system includes a relay optical lens and a collimating optical lens. The control module includes industrial computer (with reflective memory card and motion control card), I/O card, motor driver, servo motor, control cable and control software. The control module can control the change of the shape, size and energy of the target. The spectral characteristics of the radiation source are adjusted by adjusting the temperature of the black body through the black body controller.

The invention discloses an integrating sphere photometer spectral response measurement method and system. The system comprises an integrating sphere photometer and three or more reference light sources with different peak wavelengths, the integrating sphere photometer is composed of an integrating sphere and a broadband photodetector, and the broadband photodetector is installed on the sphere wallof the integrating sphere. Emergent light of the reference light sources enters the integrating sphere, the total spectral radiation flux Pi (lambda) (i =1, 2, ... n) received by the integrating sphere photometer system is acquired, the response Mi (i = 1, 2, ... n) of a photometer of mixed light in the integrating sphere is read through the broadband photodetector, an equation set is established, and the spectral responsivity Srel (lambda) of the integrating sphere photometer is obtained through numerical solution.

The invention provides a slope disaster monitoring system and method based on a multi-line laser radar. The method comprises the following steps: step a, the multi-line laser radar is started for self-test and generates point cloud data; b, the calculation core judges whether an obstacle exists in the multi-line laser radar monitoring area or not according to the point cloud data; the calculationcore transmits the monitoring data and the alarm data to the field equipment according to the obstacle information; c, the field equipment transmits the monitoring data and the alarm data to a monitoring center; and d, the monitoring center judges whether the obstacle affects driving or not. According to the slope disaster monitoring system and method based on the multi-line laser radar, rich target feature information can be obtained to achieve high-precision obstacle detection, the obstacle invasion state of a monitoring area can be obtained in real time, and meanwhile the detection distanceof a single set of equipment is far larger than the level of existing equipment; and the requirements of high real-time performance, high reliability, large-range monitoring and easy construction onsite can be met.

The invention discloses a self-excitation interference elimination method of a global system for mobile communication (GSM) repeater based on time slot detection, comprising the following steps: step one: carrying out time slot detection on a GSM signal entering a self-excitation elimination algorithm, and judging the effective time slot data to be used for the interference self-excitation elimination algorithm; step two: carrying out a normalization least mean square algorithm, and iterating and calculating a weight coefficient; and step three: updating the coefficient in a self-adapting filter by utilizing the iterative weight coefficient, and carrying out self-excitation interference elimination. The method provided by the invention has the advantages of adapting to the technical characteristics of GSM/EDGE (enhanced data rate for GSM evolution) signals, obtaining 30dB gain on antenna insulation degree of the repeater through carrying out interference self-excitation elimination algorithm processing on the valid data extracted in a time slot format, and reaching the requirements of the system on the GSM phase error and EDGE vector amplitude error when the signal is analyzed.

The invention discloses a multipurpose aircraft radio altitude simulator detection method, which comprises the following steps: a signal source is adopted to provide a certain pulse modulation signal,the signal is distributed by a power divider, and one path of the signal is detected and output by an adjustable attenuator and a detector and is sent to one signal input end of a dual-channel time/frequency counter; the other path is detected and output by a radio altitude simulator and a detector, and is sent to the other signal input end of the dual-channel time/frequency counter; and the dual-channel time/frequency counter measures the delay time of the two paths of signals, so that the altitude analog quantity value of the radio altitude simulator can be calculated according to the delaytime. The method can achieve a high-accuracy detection effect on the time delay parameters of the radio altitude simulator, and has high popularization and application value in measurement and calibration of multipurpose aircraft radio altitude special detection equipment and the like.

The invention relates to a preparation method of a seven-electrode conductivity sensor, in particular to the seven-electrode conductivity sensor and the preparation method of the seven-electrode conductivity sensor. The seven-electrode conductivity sensor comprises a circular-tube-shaped conductivity cell made of a ceramic material, seven metal circular ring inner electrodes which are sequentially distributed on the inner wall of the ceramic circular-tube-shaped conductance cell in parallel, seven metal outer electrodes which are located on the outer wall of the ceramic circular-tube-shaped conductance cell, and through hole metal electrodes which are used for connecting the metal circular ring inner electrodes and the metal outer electrodes. The ceramic material is an HTCC ceramic material or an LTCC ceramic material which can be co-fired with metal.

The invention provides a distribution line fault self-healing method which comprises the following steps: when a distribution line has a fault, fault current flows through a protection device of a distribution network switch to control tripping of the distribution network switch of level difference protection at the upper level of a fault area according to a preset level difference configuration strategy; the distribution network master station starts a preset self-healing action according to the fault information sent by the power distribution terminal and controls the preset differential protection to cooperate with the feeder self-healing action to carry out line fault processing at the same time; and judging whether the line fault is processed or not according to the line fault processing state acquired in real time, and when the line fault is processed, judging that the self-healing action is finished by the distribution network master station. According to the method, the requirements of small power failure range and short fault handling time of the distribution line are met, the feeder self-healing action effect is further optimized, and the power supply reliability is improved.

The invention provides a space-saving elastic combined device. A bearing plate is mounted at the upper ends of tertiary elastic members and connected with the bottom of a draw piece; the tertiary elastic members are mounted on the support frame lower plate of a tertiary elastic member support frame; primary elastic member positioning posts are mounted on a support base; secondary elastic members are mounted on the support frame lower plate of a secondary elastic member support frame; the tertiary elastic member support frame is mounted between the tertiary elastic elements and the secondary elastic elements; the support frame upper plate of the tertiary elastic member support frame is pressed at the upper ends of the secondary elastic members; the secondary elastic member support frame is mounted between the secondary elastic members and the primary elastic members; the support frame upper plate of the secondary elastic member support frame is pressed at the upper ends of the primary elastic members; and the primary elastic members are mounted on the support base. According to the space-saving elastic combined device, process requirements of small continuous stress variation range and relatively large continuous stress stroke can be met better.

The invention provides a method for adopting the emitter region resolving manner to verify the weapon range and precision. The method comprises the following steps in specific: 1, selecting the position of a target point, and calculating the position information of an emission site according to the trajectory model and the range of a certain type bullet; 2, loading the emission site information toan airplane display-control system and serving the emission site as a theoretical emission site of a target pattern; 3, determining the emission condition of a carrier aircraft, wherein the emissioncondition comprises the emission height, the emission speed, the carrier aircraft posture, the true heading angle, the emission area and the like; 4, enabling a pilot to control the airplane to fly according to the target pattern, and carrying out preparation operations including bullet electrifying when reaching an emission to-fly area before reaching the emission area; and 5, pressing an emission button to carry out emission/release of the weapon according to prompt when reaching the theoretical launching point and meeting the emission condition. According to the method, the selected emission in-place area range is smaller, the weapon range is controllable, and the demands for examining the weapon range and precision are met.

The invention discloses a power supply circuit and a camera testing device, and relates to the field of industrial general testing equipment.The power supply circuit comprises a micro control unit (MCU), an analog-to-digital conversion (ADC) module and at least one power supply module connected with a device to be tested (DUT), the MCU controls the power supply module to output a power supply signal to the connected DUT, and the MCU controls the power supply module to output the power supply signal to the device to be tested. The detected current value and/or voltage value of the DUT are/is output to the ADC module; the ADC module performs analog-to-digital conversion on the current value and/or the voltage value of the DUT and then feeds back the current value and/or the voltage value to the MCU; and the MCU controls the power supply module to adaptively adjust the output power supply signal according to the feedback current value and/or voltage value, thereby solving the problems of poor power supply precision, poor stability and poor universality in the camera test device in the prior art, realizing the camera test device, and improving the test efficiency. The system meets the requirements of high voltage dynamic range and high current dynamic range while solving the problems of power supply voltage precision and current test precision.

The invention provides a karaoke system, a karaoke method and a family scene karaoke system. The invention is characterized in that the system comprises a wireless audio transceiver module, a sound acquisition and processing module and an intelligent system module, the sound collecting and processing module is in signal connection with the wireless audio receiving and transmitting module and theintelligent system module. The invention provides a double-point sounding karaoke system, a double-point sounding karaoke method and a family scene karaoke system. According to the karaoke system, a loudspeaker at the microphone end sends human voice to the intelligent device for sounding through wireless signals while sounding, so that the technical effect that the microphone and the intelligentdevice sound at the same time is achieved, a three-dimensional surround sound field is integrally formed, and the karaoke effect is fuller.

The invention discloses a regulator station remote monitoring system for a self-powered sensor network. The regulator station remote monitoring system for the self-powered sensor network is characterized by comprising a monitoring center, an aggregation node, and a sensor network formed by multiple sensor nodes for data acquisition, wherein the sensor nodes carry out information exchange with themonitoring center through the aggregation node; each sensor node comprises a microcontroller module, a site electrical device, an opto-isolator module, a data transmission module, a power module and adata storage module; each power module comprises an electric supply, an EMI (Electro-Magnetic Interference) filtration module, a circuit switch module and a standby battery module. In order to prevent an external power supply from being unexpectedly interrupted, the standby battery modules are designed; when an external circuit works normally, the batteries do not supply power; when the externalpower supply is interrupted, the batteries immediately supply power to the system, so that the system is ensured to operate normally.

The invention relates to an infrared thermal wave non-destructive detection method. In the prior art, the traditional flaw detection is an analog mode, and has the following disadvantages that the defect display is not intuitive, the flaw detection technology is difficult and is easily affected by the subjective and objective conditions, and the flaw detection result is not easily saved. Accordingto the present invention, with the infrared thermal wave non-destructive detection method, the size, the shape and the distribution condition of the surface defects and the internal defects (such ascracks, gas bubbles, slag inclusion and the like) of the material can be non-destructively detected and the property of the material can be detected, the hardware of the ultrasonic wave flaw detectionsystem based on an ARM platform and an FPGA subsystem is designed, the rich peripheral equipment interfaces are provided, the FPGA design of the non-coherent digital envelope demodulation, the positive and negative delay control, the hardware real-time alarm and other modules is provided and achieved, the analog front-end design of the gain-controllable operational amplification three-level cascade is provided and achieved, the index requirements on wideband, high gain, high dynamic range and high sampling frequency are met, the power supply solving scheme combining the DC/DC converter and the low-dropout (LDO) regulator is designed and achieved, the conversion efficiency of the power supply is increased, and the stability of the whole system is enhanced; and the infrared thermal wave non-destructive detection method is used for non-destructive detection.

The invention provides an air-ground integrated mobile investigation platform. The air-ground integrated mobile investigation platform comprises a ground investigation vehicle, an unmanned aerial vehicle, a vehicle-mounted total module and an unmanned aerial vehicle total module, the ground investigation vehicle is used for bearing the unmanned aerial vehicle, the vehicle-mounted total module and the unmanned aerial vehicle total module; the vehicle-mounted total module is integrated on a ground investigation vehicle, and the unmanned aerial vehicle total module is integrated on an unmanned aerial vehicle; the vehicle-mounted total module comprises a vehicle-mounted charging module, and the vehicle-mounted charging module is charged through a generator of a ground investigation vehicle; the unmanned aerial vehicle total module comprises an airborne charging module for providing a power source for the unmanned aerial vehicle, and the vehicle-mounted charging module charges the airborne charging module in a contact charging mode, so that charging of the unmanned aerial vehicle on the ground investigation vehicle is achieved. And the task requirements of long-time, large-range and high-precision detection search, investigation identification and the like on the target under various complex environment conditions are effectively met.

The invention discloses a remote monitoring system for natural gas pressure regulating stations based on a MOBUS protocol. The remote monitoring system includes a monitoring terminal and a plurality of data acquisition terminals connected with the same via a remote transmitting module. Each data acquisition terminal includes a salve computer and a field electrical device connected with the same. The data acquisition terminal further comprises an optical coupler isolation module. The field electrical device is connected to the slave computer through the optical coupler isolation module. The remote monitoring system is designed for problems that natural gas pressure regulating stations are spaced far away from one another and high in dispersity and a traditional wired monitoring system cannot be completely competent in the monitoring of the pressure regulating stations. The natural gas remote monitoring system is formed by the remote data transmission module in combination with a STM32and the MODBUS protocol so as to achieve the wireless remote monitoring of natural gas and meet the monitoring needs of a wide range and long distance.

The invention discloses an automatic soil moisture detection method adopting an environment backscattering technology, and belongs to the technical field of soil moisture detection. The method comprises the following steps of: establishing a soil moisture detection system; establishing a corresponding relationship between the soil moisture content and square wave frequency; establishing a networkof a plurality of soil moisture sensors; receiving signals and calculating soil moisture content. According to the method, the power consumption of the soil moisture sensors can be greatly reduced, the maintenance cost of the sensor network is reduced, and the purposes of multi-point deployment of the soil moisture sensors in precision agriculture and long-time work under an unattended condition are achieved.