The above Table 1 shows the actual velocity speeds in the left column and the displayed speed at antenna to target angles in the right column if the radar gun is not adjusted for the horizontal angle from the position of the gun antenna to the target. A sound velocity probe is a device that is used for measuring the speed of sound, specifically in the water column, for oceanographic and hydrographic research purposes. The accelerometer generates a signal representing the tilt angle. In its simple form the pitot tube consists of a glass tube whose lower end is bent at right angles (Fig. Another advantage of taking measurements above the water is that waterproof instruments are not required. 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. The head is a function of flow velocity, and therefore, the flow rate through the device. Instead, it must be calculated in a process known as stream gaging. point velocity probe (PVP) to investigate groundwater velocity below the water table suggested that the PVP may also be capable of measuring groundwater velocity within the capillary fringe. By placing the accelerometer in the radar gun. The Flow Probe incorporates the unique Turbo-Prop propeller sensor, which uses the most accurate positive displacement technique available for velocity … This Device Is Connected To A U-Tube Manometer With Oil As Manometric Fluid. Swoffer water flow equipment has the advantage of easy to use, flexible design to measure shallow and deep channels as well as low and rapid velocities. There are several types of open channel flow meters, the traditional methods using primary devices such as flumes or weirs. The sensors are aligned horizontally with the two sides of the radar gun and separated by 90Â°. This velocity measuring device is a useful tool for manually measuring flow in open channel applications. Thus, the speed calculation must compensate for the horizontal angle. They are rugged, easy to use and suitable for flood gauging. 1. Open channel flowmeters perform flow measurement of liquids that are open to the atmosphere at some point in the flow measurement path. 02062 under model number ADXL202. 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. Applicant's invention provides for automatically entering the vertical or tilt angle into the software for the vertical cosine correction, replacing the operator's manual entry of the past. Electromagnetic meters. The greater the tilt angle, the greater the effect of gravity on one of the sensors. Thus it is important to correct for the vertical angle when taking measurements of surface water from an elevated position. Provides remote control and operation of float mounted ADCP/ADPs used for gauging rivers. In all cases, the radar device is elevated above the water, so the vertical angle must be compensated for. It is primarily used in measuring discharge. This is a two-axis accelerometer that is suitable for measuring static acceleration (e.g. Pitch angle=asin (acceleration in the x direction/1 g calibration from the x sensor reading). Calculate Velocity Of Air In The Duct (Specific Gravity Of Oil= 0.7 And, Density Of Water Is 1000 Kg/m3) The true speed can be calculated from the indicated speed, using the following formula: If we assume the angle A is 10Â°, the cosine of A is 0.9848. Current meter measures the velocity of flowing water in an open channel or ditch and streams where direct methods of measurement are not practicable. A Pitot tube is a device use to measure the fluid flow velocity. Electromagnetic flow meter. 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. Unlike the acoustic doppler devices and POEM, propellor current meters can't measure turbulence. The equation is used to measure flow in locations where the construction of a hydraulic structure (flume or weir) is impractical. It is a related object to provide a radar gun with automatic tilt or vertical angle correction so that the gun can be positioned above the water surface, minimizing the hazardous risks to the operator if the operator was required to stand in the moving water. The formula utilizes the cross-sectional average velocity, hydraulic radius, roughness coefficient, and the slope of the channel. 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