37 results about "Current meter" patented technology

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The invention discloses a flow field adaptive calculation method and system based on an acoustic Doppler flow meter. Comprising the following steps: acquiring original frequency spectrum data and synchronous attitude, position and water level information of a Doppler current meter; performing preprocessing and quality marking on the original data; multi-dimensional features are extracted, and a current dominant flow field type is identified through a pre-trained flow field classification model; adaptively selecting a flow velocity profile reconstruction algorithm according to the flow field type, and dynamically adjusting key algorithm parameters according to flow field stability or turbulence intensity parameters in the reconstruction process; a calculation grid is dynamically generated based on a flow velocity field of a reconstruction strategy to perform flow integral calculation, and data, a model and an integral error are comprehensively evaluated to quantify uncertainty of an output flow result; and finally performing flow field abnormity diagnosis, short-term flow trend prediction and equipment health state early warning. According to the method, the problem of insufficient precision of a traditional fixed algorithm in a complex flow field is solved, and the reliability and the intelligent level of flow monitoring are remarkably improved.

The invention relates to an open boundary circulating flow and reconfigurable terrain collaborative maritime work scouring intelligent test system and test method, a maritime work structure test model is installed at the center position of a main body structure inner cavity test section, and a set area with the maritime work structure test model as the center is used as a main test section; the open-boundary circulating flow generation system realizes back supplement and closed-loop operation of circulating water channels of the left bank and the right bank; a multi-beam three-dimensional terrain scanner is installed on the side portion of the large-span electric measuring bridge system, and sand bed terrain and scour pit three-dimensional shape data are obtained; a three-dimensional acoustic Doppler current meter and a capacitive wave height meter are installed on the track type instrument bridge measuring system, and multi-dimensional dynamic monitoring is conducted on the sand bed terrain and the scouring pit; the multidirectional irregular wave generation system is used for simulating regular waves and irregular waves in an offshore environment. According to the invention, the aspects of structure scale, terrain coupling and measurement and control feedback intelligence are comprehensively upgraded, and a more real and reliable test basis with strong engineering adaptability is provided for research on scouring stability of major ocean engineering.

The invention provides an offshore wind power pile foundation scouring real-time monitoring system which comprises an underwater camera, a rotatable scanning sonar, a single-point flow velocity meter, an acceleration sensor, a fiber grating sensor and a data processing transmission unit which are cooperatively used. Synchronous monitoring of the seabed terrain around the pile, the scour depth and range, the ocean current flow velocity and flow direction and the pile foundation vibration response acceleration signal and strain signal is achieved; the data processing and transmitting unit completes collection and fusion analysis of multi-source data and transmits a monitoring result to a land monitoring station in real time. According to the system, collaborative real-time monitoring of multi-element parameters of ocean current-scoured terrain-structural response is achieved, the dynamic evolution law of the seabed terrain is accurately mastered, a dual verification mechanism of directly detecting the scour depth by scanning sonar and inversing the scour depth by structural vibration response is adopted, the scour depth monitoring precision can be greatly improved, and the real-time performance of the system is improved. And reliable data support is provided for long-term safe operation, structural health assessment and scouring protection design of the offshore wind turbine.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The application relates to the technical field of hydrological monitoring and discloses an intelligent hydrological monitoring system based on Internet of Things, which comprises an upper computer, a flow measurement control platform, a network communication module, a PLC controller, a mechanical system and a flow measurement system. The flow measurement control platform respectively instructs the PLC controller and the flow measurement system through the network communication module. The flow measurement system is used for acquiring hydrological monitoring data and uploading the flow measurement control platform. The flow measurement system comprises an ADCP flow measurement, a radar flow measurement, a time-difference method ultrasonic flow measurement, a propeller current meter and a field water level meter. The flow measurement system selects a flow measurement method according to needs at different measuring point positions in the same section to jointly measure the flow. The flow measurement system is equipped with multiple flow measurement methods and is uniformly controlled and dispatched by the flow measurement control platform, so that the monitoring system has good expandability. On this basis, a corresponding flow measurement scheme can be automatically generated according to different water level levels, the advantages and disadvantages of various flow measurement methods are complementary, and the detection precision is further improved.

The application relates to the technical field of building construction, in particular to a high-water-level silt geology underground water level control device and a construction method, the high-water-level silt geology underground water level control device comprises an outer protective shell, an upper cover, a pressure detection seat, an inner conductive sheet and an outer conductive sheet, the outer protective shell is a cylindrical structure, an outer through hole is formed in the outer protective shell, an outer layer filter membrane is fixedly installed in the outer through hole, and a secondary embedded groove is formed in the inner side wall of a three-stage separation layer. The high-water-level silt geology underground water level control device is composed of the outer protective shell, the upper cover, the pressure detection seat, the inner conductive sheet and the outer conductive sheet, and conductive liquid is injected into a liquid storage cavity and a conductive cavity on the pressure detection seat, so that the liquid level in the conductive cavity changes under the pressure of underground water, the effective conductive area between the inner conductive sheet and the outer conductive sheet changes, the current of a current meter changes, and the pressure of the underground water is monitored.

The utility model discloses a portable radar flow velocity meter which comprises a flow velocity meter body and a bottom plate, the bottom of the flow velocity meter body is slidably connected with a telescopic rod, the bottom end of the telescopic rod is fixedly connected with a rotating rod, the top end of the bottom plate is fixedly connected with two fixing plates, and the rotating rod penetrates through the two fixing plates and is rotatably connected with the fixing plates. A base plate and a limiting ring are arranged on one side of a grip of the current meter main body; according to the utility model, the telescopic rod is arranged at the bottom of the current meter main body, can be stretched out at a proper position and is supported by the bottom plate, so that the stability during measurement is improved, and meanwhile, the cushion plate and the limiting ring are arranged to limit the arm, so that the holding stability is improved, and the situation that the arm slips out of the hand due to non-tight holding is avoided; therefore, the safety and the stability of the device are improved.

The present application relates to the technical field of ocean current monitoring, and discloses a kind of ocean current meter data quality control method and system based on adaptive filtering.The original data containing ocean current direction and speed are obtained, after being decomposed into eastward and northward flow velocity components, frequency spectrum distribution is obtained by Fourier transform, dynamic filtering window is determined by adaptive filtering algorithm, components are preprocessed and feature vector is extracted to calculate flow direction;According to whether the amplitude of the feature vector changes is over the threshold, select Kalman filter to smooth the component or directly obtain the corrected flow direction data;The dynamic trend is extracted by principal component analysis method for the corrected data, and the main direction feature set is obtained;Based on the analysis of the influence of tides and topography, the environmental influence weight is obtained;The filtering parameter update frequency is adjusted by the weight, and the real-time component is filtered twice to output high-precision ocean current direction data.This method can improve the accuracy of ocean current meter data quality control and improve the monitoring accuracy.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The utility model discloses an angle-adjustable radar wave velocity measurement device, which comprises a radar wave velocity meter, a positioning assembly and an aluminum plate, the lower end of the aluminum plate is fixedly connected with two mounting plates, a main shaft is rotatably connected between the two mounting plates, one end of the main shaft is fixedly provided with a bracket, and the main shaft is provided with a horizontal adjusting mechanism for adjusting the horizontal angle of the bracket. One end of the support is rotationally connected with a shell, a pitching adjusting motor is installed in the shell, the radar wave current meter and the positioning assembly are installed in the shell, and the aluminum plate is provided with a plurality of fixing assemblies used for being connected with a cableway. According to the utility model, the horizontal angle and the pitching angle of the radar wave flow velocity meter can be adjusted in real time according to the change of the water level, so that the radar wave beam and a lead fish monitoring point can be positioned on the same vertical line, the water flow velocities at different water depths are compared, and the monitoring precision of the water flow velocity is improved.

This utility model relates to a water surface velocity monitoring device installed on a navigation beacon, comprising a first laser current meter, a second laser current meter, a voltage subtractor, an absolute value module, a Schmitt trigger, an electronic control switch module, and an audible and visual alarm module. The output terminal of the first laser current meter is connected to the inverting input terminal of the voltage subtractor, the output terminal of the second laser current meter is connected to the non-inverting input terminal of the voltage subtractor, the output terminal of the voltage subtractor is connected to the input terminal of the absolute value module, the output terminal of the absolute value module is connected to the input terminal of the Schmitt trigger, the output terminal of the Schmitt trigger is connected to the controlled terminal of the electronic control switch module, one end of the electronic control switch module is connected to a power supply voltage, the other end of the electronic control switch module is connected to the positive terminal of the audible and visual alarm module, and the negative terminal of the audible and visual alarm module is grounded. This utility model allows personnel to intuitively determine whether the water flow velocity collected by the laser current meter is accurate.

The utility model discloses an electric wave current meter, relates to the electric wave current meter field, the electric wave current meter comprises an electric wave current meter main body and a grab handle, the top of the grab handle is provided with an adjusting assembly, the adjusting assembly comprises a threaded column installed on the top of the grab handle, the outer wall of the threaded column is respectively sleeved with a rotating sleeve and a movable ring, the bottom of the movable ring is provided with a movable groove, and the movable groove is provided with a through hole. And a movable block is arranged in the movable groove. According to the utility model, through the arrangement of the adjusting assembly, when the angle of the electric wave flow velocity instrument main body needs to be adjusted, the rotating sleeve can be rotated, the movable block is driven to slide in the movable groove, the rotating sleeve moves during rotation, then the movable ring is driven to move, the movable ring drives the rotating plate to rotate, and the rotating plate drives the electric wave flow velocity instrument main body to rotate; therefore, the angle of the electric wave flow meter main body can be quickly adjusted, the adjusting process is simple and convenient, the operation is simple and convenient, and the adjusting efficiency of the angle of the electric wave flow meter is improved.

This utility model discloses a current monitoring device for surge arrester resistor elements in extremely cold environments, belonging to the field of surge arrester resistor elements. It includes an extreme cold insulation component and a lifting component. The extreme cold insulation component includes a chassis, with a resistor element current detector detachably mounted on the upper end of the chassis. A resistor element current meter is installed inside the upper end of the resistor element current detector, and an insulation sleeve is fitted onto the side surface of the resistor element current meter. A protective sleeve is detachably mounted on the upper end of the chassis. The lifting component includes several hinge blocks mounted on the side surface of the chassis. This utility model, through the combination of the extreme cold insulation component and the lifting component, not only facilitates current detection of the surge arrester resistor elements but also enables the monitoring device to operate normally in extremely cold environments, thereby improving the ease of use of the current monitoring device. Furthermore, the coordinated structure allows for easy adjustment of the height of the current monitoring device as needed, further enhancing usability.

A method for estimating river flow based on unmanned aerial vehicles (UAVs) and decision tree regression includes: using a UAV equipped with a small dual-beam lidar and an ultrasonic current meter to measure the coordinates of measuring points, water depth, and surface velocity of the river cross-section; dividing the river surface area into refined segments and determining the abscissa of each segment's vertical line; using a decision tree regression algorithm for supervised learning, determining the subset of the trained model based on the set maximum depth of the decision tree, and predicting the water depth and surface velocity corresponding to each segment's vertical line; calculating the cross-sectional area and average velocity between adjacent vertical lines based on the predicted water depth and surface velocity of each vertical line, and obtaining the river cross-section flow by multiplying and summing the areas of each segment and the average velocity. This invention has significant practical value for measuring river flow under arbitrarily complex hydrological conditions.

This invention belongs to the field of hydrological element monitoring technology in the water conservancy and hydrology industries. Specifically, it relates to a circulating mobile suspension multi-cable multi-span radar current meter cableway structure, including a first support, a sag cable, a main cable, a cable saddle support, a circulating cable, an adjusting cable, a radar trolley, a circulating wheel, and a second support. This invention can both install a radar current meter to measure the water surface velocity along a fixed vertical line and allow for real-time adjustment of the current meter sensor position when the main channel of the riverbed swings, ensuring effective monitoring of the water surface velocity. At the same time, it controls the cableway sag within a safe range, reducing or eliminating errors and safety hazards caused by the radar current meter's position shifting due to wind influence. Furthermore, the circulating cable allows the radar current meter to be retrieved for maintenance during equipment repairs.

The application discloses a flow field self-adaptive calculation method and system based on an acoustic Doppler current profiler. The method comprises the following steps: collecting original spectrum data of a Doppler current meter and synchronous attitude, position and water level information; pre-processing and quality marking the original data; extracting multi-dimensional features, identifying the current dominant flow field type through a pre-trained flow field classification model; adaptively selecting a flow velocity profile reconstruction algorithm according to the flow field type, and dynamically adjusting key algorithm parameters in the reconstruction process according to flow field stability or turbulent intensity parameters; generating a calculation grid for flow integration calculation based on the reconstruction strategy, and comprehensively evaluating data, models and integration errors to quantify the uncertainty of the output flow result; and finally, performing flow field anomaly diagnosis, short-term flow trend prediction and equipment health state early warning. The application solves the problem of insufficient accuracy of traditional fixed algorithms under complex flow fields, and significantly improves the reliability and intelligent level of flow monitoring.

This utility model discloses a four-cableway multi-point radar wave flow measurement device, including a first tower and a second tower fixed on both banks of a river. Each tower has two upper cableway positioners and two lower cableway positioners. The two ends of the two upper and lower cables pass through the corresponding cableway positioners on the first and second towers and are fixed to the ground. The two upper cables are connected by several upper connecting plates, and the two lower cables are connected by several lower connecting plates. An adjustable-length rotating rod structure is installed between each corresponding upper and lower connecting plate. Several radar current meters are installed along the width of the river on the lower cables or lower connecting plates. This utility model provides a complete solution for high-performance, high-reliability, and maintenance-free automated hydrological monitoring of bridge-free river sections, possessing extremely high promotional value and market prospects.

The invention discloses a safety calibration tool for electrical safety detection equipment of a new energy automobile, which comprises a connector panel, a function switching panel and a metering standard device, and is characterized in that the connector panel is connected with the electrical safety detection equipment of the new energy automobile and comprises a national standard direct current charging socket, a national standard alternating current charging socket and a potential test connector; the function switching panel comprises a multi-way switch, the metering standard device comprises a voltmeter, a high-voltage high-value resistor, an ampere meter and a direct-current standard resistor, one end of the switch is connected with the national standard direct-current charging socket, the national standard alternating-current charging socket and the potential test connector, and the other end of the switch is connected with the high-voltage high-value resistor and the direct-current standard resistor; one-time stable connection is achieved through the special connector panel, current leakage and internal resistance abnormity caused by poor contact are avoided, and calibration errors are reduced in combination with the metering standard device; the connection interface does not need to be plugged and adjusted for many times, and different calibration items can be switched through switching operation of the function switching panel.

The invention relates to the technical field of river flow monitoring, in particular to a river flow monitoring system which comprises a supporting frame, a sliding frame, a driving motor, a transmission part and a plurality of monitoring units, the supporting frame is fixedly arranged, the sliding frame is slidably mounted on the supporting frame, and the driving motor drives the sliding frame to slide up and down along the supporting frame through the transmission part; a plurality of monitoring units are sequentially arranged at intervals in the width direction of the river surface, each monitoring unit is composed of a communicating pipe, a floating ball, a first conductive rod, a first conductive sleeve, an ampere meter and the like, and the system is further provided with a lifting control circuit and a liquid level regulation and control circuit. The flow velocity near the water surface and the water depth are converted into current signals capable of being monitored in real time, indirect and real-time monitoring of the river channel flow is achieved, the problems that manual operation is low in efficiency and precision is interfered are solved, and the river channel flow monitoring device has the advantages that automatic and efficient monitoring of the river channel flow is achieved, the measuring precision and efficiency are improved, and manual dependence and environmental interference are reduced.

The utility model discloses a deep sea subsurface buoy system suitable for fine observation of a bottom boundary layer, which comprises a seabed base, a plurality of single-point flow velocity observation units and a main floating body which are sequentially connected from bottom to top, the plurality of single-point flow velocity observation units are arranged between the seabed base and the main floating body along the tensile cable, and each single-point flow velocity observation unit is integrated with a deepwater single-point current meter and a CTD; an acoustic Doppler flow velocity profiler is installed in the main floating body, and the acoustic Doppler flow velocity profiler, an ADV, a CTD and a double-parallel acoustic releaser are integrated on the seabed base. According to the utility model, an observation blind area is eliminated through structure optimization, and a core area (5-10m) of a bottom boundary layer can be brought into an observation range; multiple observation units with vertical spacing can capture full-water-depth ocean current change details, and the data resolution is improved; due to the arrangement of the double parallel acoustic releasers, the equipment reliability is improved, and the risk of recovery failure is effectively reduced; and long-term continuous observation can be realized.

According to some embodiments, a window controller system is provided, the window controller system comprising: a plurality of sets of wires, each set of wires of the plurality of sets of wires operatively coupling the window controller system to an insulated glass unit (IGU) of a set of IGUs controlled by the window controller system; a plurality of sets of current meters, each set of current meters associated with an IGU of the set of IGUs; and a controller. The controller may be configured to: determine, using a first current meter, a current provided to a IGU; determine, using a second current meter, a return current from the IGU; compare the current provided with the return current; and determine leakage current information associated with a wire of an electrical pathway based at least in part on the comparison of the current provided with the return current.

The utility model relates to radar current meter technical field, concretely relates to a radar current meter with balance structure, including current meter, and the connecting rod fixed connection of current meter through balance subassembly and outside, and balance subassembly includes chassis, locking sleeve, connecting plate, erects cage and pipe clamp, and the top of chassis is fixed in the top of current meter, and the top of chassis is fixed with liquid bubble pipe, and locking sleeve includes bottom bar and the sleeve that sets up in the outside of bottom bar, and the bottom of connecting plate is fixed with top bar, and top bar sets up in the sleeve, and the top of connecting plate is fixed with erects cage, and the top of erects cage is fixed with multiple groups of pipe clamp, because bottom bar and top bar are screw rod structure of spiral opposite, so in the process of moving, will move to inside / outside simultaneously, realizes the height adjustment of this side, and multiple locking sleeves and liquid bubble pipes are arranged on the connecting plate, can carry out adjustment after monitoring multiple directions, satisfy the functional requirement of balance.

This application discloses a channel flow measurement method and apparatus based on big data-based velocity estimation, relating to the field of channel water flow measurement. The method includes acquiring the surface depth of water, surface depth of silt, surface velocity of water, and intra-water velocity measured using an automatic current meter at different times and locations of various measuring points under different operating conditions in a target channel; inferring the matching relationship between surface depth, silt surface depth, and intra-water velocity, or deriving the matching relationship between surface depth, silt surface depth, surface velocity, and intra-water velocity, thereby determining the flow rate of the channel under test. In this application, the matching relationship between surface depth, silt surface depth, and velocity, or the matching relationship between surface depth, silt surface depth, surface velocity, and intra-water velocity, enables accurate measurement of flow rate under extreme sediment conditions.

This invention discloses a positioning and measuring device for hydrological monitoring, specifically relating to the field of hydrological monitoring technology. It includes a measuring cylinder and a base. A sleeve is fitted onto the measuring cylinder, and a rotating cylinder is rotatably connected to the outside of the sleeve. Two clamping plates are hinged to the rotating cylinder. A shell is located at the top of the measuring cylinder, and a first and second winding drum are rotatably connected inside the shell. An upper pull rope and a lower pull rope are respectively wound around the first and second winding drums. A pulley is rotatably connected to the bottom of the measuring cylinder. The free end of the upper pull rope is fixed to the top of the sleeve, and the free end of the lower pull rope passes around the pulley and is fixed to the bottom of the sleeve. A driving mechanism for driving the rotation of the first and second winding drums is also provided. This invention achieves rapid assembly and disassembly of the current meter, flexible adjustment of the measuring cylinder length, and precise fixation of the measurement position, significantly improving operational efficiency and the accuracy of measurement data. It has broad application prospects and significant practical value.

This utility model discloses a wireless charging pile with current display for a temperature measuring rod device, comprising a stainless steel shell and an acrylic face shield. The acrylic face shield is fixedly installed at the front end of the stainless steel shell, and a charging current meter is embedded inside the stainless steel shell at the rear end of the acrylic face shield. The temperature measuring rod bracket is fixedly installed at the lower front end of the acrylic face shield. In one embodiment, a wireless charging module is embedded inside the stainless steel shell. By integrating the wireless charging module into the stainless steel shell and providing a dedicated temperature measuring rod bracket with an inwardly curved design, the bracket ensures a stable fit of the temperature measuring rod, achieving accurate charging and solving the problem that ordinary charging piles cannot be adapted to temperature measuring rods. The built-in charging current meter monitors the charging current in real time. When the data is abnormal, the operator can promptly detect and repair it, avoiding damage to the charging pile and temperature measuring rod due to abnormal external current, thus improving equipment safety.

The utility model provides a shipwreck state real-time monitoring system, which comprises a data acquisition system, a signal conversion system, an underwater sound wireless transmission system and a data integration processing terminal system, and transmitting terminals of the data acquisition system, the signal conversion system and the underwater sound wireless transmission system are arranged on a shipwreck. The receiving ends of the data integration processing terminal system and the underwater sound wireless transmission system are arranged on a construction mother ship; the data acquisition system comprises a positioning beacon, an attitude indicator, a depth finder, a pressure gauge, a two-dimensional image sonar and a flow velocity meter; the monitoring equipment adopted by the utility model is mature in technology, simple in structure, convenient to install and high in reliability, and can be widely popularized in the fields of sunken ship salvage operation and the like.

The utility model discloses a long-endurance semi-automatic flow and sediment measuring system capable of remote monitoring, which relates to the technical field of hydrological monitoring equipment and comprises a base, buoys, a platform, a flywheel energy storage system, a monitoring system, a radio transmission system, a solar power generation system and a storage battery. The monitoring system comprises a current meter and a sediment monitor, the radio transmission system comprises a radio signal transceiver, the solar power generation system comprises a mounting frame and a solar power generation panel, and the solar power generation panel is electrically connected with the flywheel energy storage system through a power converter; the flywheel energy storage system is electrically connected with the monitoring system, the radio transmission system and the storage battery through the power converter, and the storage battery is electrically connected with the monitoring system and the radio transmission system. The river flow velocity and sediment content can be continuously monitored for a long time, remote monitoring is achieved, the labor cost is reduced, and the efficiency and quality of monitoring work are ensured.

The invention relates to the technical field of flow measurement control, in particular to a flow measurement control method and system based on a flow meter carried by an electric hoist. The method comprises the following steps: acquiring a measurement task of a target section, selecting a current operation mode of an electric hoist according to scene information in the measurement task to control the electric hoist to execute the current operation mode, and triggering a rotor type flow velocity meter and a horizontal sampler in a classified manner to acquire signal characteristics of the flow velocity meter and a sediment physical sample; acquiring operation feedback data of the electric hoist, and executing measuring point correlation calibration to construct an electric hoist-flow meter cooperative control model; associating the real-time position data of the electric hoist-flow meter cooperative control model with the real-time position data of the fish lead so as to optimize the current operation mode; and controlling the electric hoist to execute the optimization result of the current operation mode through the remote controller, and visualizing the obtained flow meter signal execution. According to the invention, the burden of manual flow measurement can be obviously reduced, and the measurement efficiency and the data quality can be improved.

The application discloses a propeller photoelectric current speed meter for tidal flow measurement, which comprises a speed meter controller, a measuring rod and a propeller head connected in sequence, and the propeller head is matched with a slidable and rotatable propeller through a probe; the speed meter can quickly judge the flow speed of tidal river mouth and the forward and reverse flow directions; the flow speed is judged by the rotating speed of the propeller; the forward and reverse directions of tidal flow are judged by the cooperation of the propeller at different positions of the propeller shaft and the probe, or the direction of tidal flow is judged by the color of light waves reflected by the reflective coating of the propeller; the propeller is divided into three sections, one end of which is provided with a first reflective coating, the other end is provided with a second reflective coating, and the middle section is not provided with a reflective coating; when the probe is located at one end of the first reflective coating, it indicates that the tide is in the forward direction; and when the probe is located at one end of the second reflective coating, it indicates that the tide is in the reverse direction; the speed meter has the advantages of simple structure, convenient operation, high measurement precision and high data reliability.