When the beam strikes the target, a small amount of energy from the beam is reflected back to the antenna in the radar device. Provides remote control and operation of float mounted ADCP/ADPs used for gauging rivers. The Flow Probe incorporates the unique Turbo-Prop propeller sensor, which uses the most accurate positive displacement technique available for velocity … In all cases, the radar device is elevated above the water, so the vertical angle must be compensated for. The water velocity probe consists of a protected water turbo prop positive displacement sensor coupled to an expandable probe handle with a digital readout display. Staff gages and float-operated units are the simplest devices used for this purpose. A processor in the radar device calculates the cosine correction factor that is applied to the measured velocity of the target point. The accelerometer generates a signal representing the tilt angle. It is advantageous to be able to take the velocity measurements above the water surface so that waterproof instruments are not required. With the mobile measuring device RP-30 (Radar Profiler) a surface velocity profile from rivers and channels is created and together with the data of the river cross-section and water level the discharge is determined. In its simple form the pitot tube consists of a glass tube whose lower end is bent at right angles (Fig. At the same time that the microprocessor is receiving a reading from the y-axis sensor, Turning to FIG. gravity). Pygmy meter: a wheel is rotated by water flow and the rate of the rotation signifies the water velocity. Accelerometers can detect a change in tilt because they can measure and account for the Earth's gravity. “The device is a more efficient and inexpensive way to measure evaporation when compared with existing methods,” Bengaluru-based IISc said in a statement on Friday. Swoffer water flow meters are designed to measure velocity in any application from streams and rivers to storm water and sewage. The only thing that is necessary are Arduino and some basic crafting skills and, of course, a free flowing stream. While the invention has been described in conjunction with a specific embodiment, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Calculate Velocity Of Air In The Duct (Specific Gravity Of Oil= 0.7 And, Density Of Water Is 1000 Kg/m3) Many factors can generate currents, such as gravitational forces, rotation of the earth, wind, water conditions gradients and/or geographical landscapes. Meters are devices that measure the stream flow by directly measuring the current. The radar device then determines the target speed from the difference between the transmitted and reflected signal. 2, there is illustrated a person. The radar device includes a tilt sensor, or accelerometer, to measure the angle of tilt of the radar device with respect to a target point located at a distance from the radar device. We offer the Global Water Flow Probe. They measure water level and convert this to water flow. 4.24) consists of a float suitably connected to a recording device. The proposed velocity-measuring device (1) can measure the velocity of a wide range of objects via simple sound waves utilising the Doppler-effect principle. ADCP Channelmaster - RDI This Acoustic Doppler Current Profiler (ADCP) can accurately measure the velocity of rivers, streams, estuaries, channels, ports and harbours, across a channel up to 300 meters wide. At 90° the target speed is 0 which is grossly incorrect. In such cases it is essential to measure depth and velocity and then determine the flow measurement. Others are more suitable for monitoring water flow in pipes. RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES, Systems using the reflection or reradiation of radio waves, e.g. The reflected signal frequency shifts by an amount proportional to the speed of the target. A versatile bucket wheel water current meter good for measuring very low flows. A Pitot tube is a device use to measure the fluid flow velocity. 1. x-axis and y-axis). Propellor current meters - these are the older mechanical meters and still the standard in New Zealand. Radar has been used for years to determine the speed of moving objects. Pitch angle=asin (0.9636)=74.5° or 90°−74.5°=15.5° down. In both cases, an especial measuring device is employed to measure the water or the fracturing fluid that is pumped into the rock. There are also a few less commonly used devices, such as a radar setup that measures the velocity of waves and micro-waves on the surface of the water. The Pitot tube was invented by a french engineer Henri Pitot i early 18s and further modified by a french scientist Henry Darcy. This is a phenomenon called the cosine effect. FIG. An accelerometer is a sensor that converts acceleration from motion or gravity to an electrical signal. DECATUR ELECTRONICS, INC., ILLINOIS, Free format text: radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified, Systems using reflection of radio waves, e.g. 3 is an electrical schematic diagram of the accelerometer used to determine tilt angle and how it is connected to the radar device's microprocessor. When the target's path (the water flow direction) is not parallel with the gun's antenna, the radar device displays a speed which is lower than the actual water surface velocity. Manning’s Equation, as it is commonly referred to in the United States, is an empirically derived formula for estimating the average velocity of a liquid flowing in an open channel. means for correcting the velocity measured to correct for the radar gun being disposed above or below the horizontal thus resulting in an erroneous reading due to the radar gun being disposed at an angle with respect to the horizontal, the means for correcting the velocity measured being a sensor that senses the angle of the radar gun with respect to the horizontal. The fluctuations in the water level make the float move which in turn actuates a pen. “The device is a more efficient and inexpensive way to measure evaporation when compared with existing methods,” Bengaluru-based IISc said in a statement on Friday. This invention relates to measuring devices and more particularly to a surface velocity radar device for measuring water surface velocity. Currently, pan evaporimeters – resembling large pans that are filled with water – are the most commonly used devices to measure evaporation rates. It is not the most practical way to measure the velocity, but that is not … They are rugged, easy to use and suitable for flood gauging. A radar device for measuring the surface velocity of water moving in a horizontal plane in which the radar device is positioned above or below the horizontal plane. The radar device includes a tilt sensor, or accelerometer, to measure the angle of tilt of the radar device with respect to a target point located at a distance from the radar device. This is known as the Doppler effect. While technology has changed over the years, we've still achieved a high level of standardization. An accelerometer that is found to satisfactorily operate is one manufactured by Analog Devices, Inc. One Technology Way, Norwood, Mass. 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