This Device Is Connected To A U-Tube Manometer With Oil As Manometric Fluid. The greater the tilt angle, the greater the effect of gravity on one of the sensors. 02062 under model number ADXL202. Unlike the acoustic doppler devices and POEM, propellor current meters can't measure turbulence. 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. 7.72). When taking readings of moving water, such as rivers or streams, the radar gun is generally positioned above the stream, on a bridge, or adjacent to the stream, on a riverbank. It has a tail fin, to allow cable gauging, so can't operate in water as shallow as the Pygmy. These large propeller type meters are supplied with one propeller for flows up to 6.0 m/s. The change in … FIG. In such cases it is essential to measure depth and velocity and then determine the flow measurement. 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. The equation is used to measure flow in locations where the construction of a hydraulic structure (flume or weir) is impractical. NIWA has built flow stations on rivers and canals for decades. DECATUR ELECTRONICS, INC., ILLINOIS, Free format text: A Pitot tube is a device use to measure the fluid flow velocity. The only thing that is necessary are Arduino and some basic crafting skills and, of course, a free flowing stream. Global Water Flow Probes are highly accurate water velocity instruments for measuring flow in open channels and partially filled pipes. As the angle increases, the target speed erroneously decreases, as Table 1 below shows. An accelerometer is a sensor that converts acceleration from motion or gravity to an electrical signal. 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) This is a phenomenon called the cosine effect. 1 is a side elevation view of the inventive radar gun tilted down at a 45° angle. All rights reservedPrivacy Policy, 2016, Free phone within New Zealand: 0800 RING NIWA (0800 746 464) Contact details, Air quality monitoring with low-cost sensors, ICES Expert Working Group Meetings – April 2017, Neon Remote Terminal (NRT Terrestrial) - Unidata, Small prop current meters - Ott, Oss, Seba, CHES - smarter use of New Zealand's river waters, NIWA research vessel returns home after epic voyage, Fresh scientific scrutiny for Arrowtown air, Shining new light on ground water measurements, Meeting the flood challenge in post-quake Christchurch. Thus pitch angle=asin (53/55). 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. In both cases, an especial measuring device is employed to measure the water or the fracturing fluid that is pumped into the rock. When a vertical (pitch-down) angle is introduced into the measurement, both angles affect the final calculated display speed. 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. In all cases, the radar device is elevated above the water, so the vertical angle must be compensated for. Pitch angle=asin (0.9636)=74.5° or 90°−74.5°=15.5° down. Assignors: SMITH, KEVIN T., JANSON, SCOTT D., SMITH, KIMBLE J. 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. 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. This internal automatic compensation allows for accurate measurement of the surface velocity of the water. It is an object of the invention to provide a radar gun that measures surface velocity and automatically compensates for the vertical or tilt angle of the gun with respect to the target. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and scope of the appended claims. a tilt sensor mounted in the radar gun to provide an output signal that includes a tilt angle component. This is commonly referred to as yaw. Thus, the speed calculation must compensate for the horizontal angle. It is primarily used in measuring discharge. Read about how a POEM was used to gauge the flow of water entering the Lake Pukaki canal on the Waitaki hydroelectric scheme  POEM has no moving parts and, in addition to measuring flow up to 10m/s, can simultaneously provide useful information about turbulence. The head is a function of flow velocity, and therefore, the flow rate through the device. 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. The law of electromagnetic induction is also utilized, which takes the water flow as a conductor to measure the flow velocity. 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. 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. FIG. NIWA uses, and can usually supply several different types of water flow measuring instrument: Acoustic Doppler instruments - These are becoming increasingly popular and some variants, for example the Acoustic Doppler Current Profiler (ADCP) may ultimately supercede the older mechanical open channel meters that have, over the past few decades, become NIWA's standard instrument for gauging open channel waterways in New Zealand and the Pacific Islands. Doppler meters measure the frequency of sounds that are bounced back from a moving object. When the antenna transmits the beam of radio waves, the beam forms an elliptical pattern onto the target area. Another advantage of taking measurements above the water is that waterproof instruments are not required. Copyright, NIWA. Simultaneously the other sensor displaces a smaller angle and the effect of gravity on the other sensor is less. Next, here are presented the Top 7 Liquid Flow Measuring Devices for Oil and Natural Gas. Propellor current meters - these are the older mechanical meters and still the standard in New Zealand. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). 4.24) consists of a float suitably connected to a recording device. 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. primary radar systems; Analogous systems, Systems of measurement based on relative movement of target, Velocity or trajectory determination systems; Sense-of-movement determination systems, Velocity or trajectory determination systems; Sense-of-movement determination systems processing the video signal in order to evaluate or display the velocity value, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SMITH, KIMBLE J.;JANSON, SCOTT D.;SMITH, KEVIN T.;REEL/FRAME:012183/0456;SIGNING DATES FROM 20010909 TO 20010911, ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION, Simulating a radar signal reflected from a moving target, Method and Apparatus for Acquiring Local Position and Overlaying Information, Radar speed measuring device and method based on angle compensation, Device for measuring the frequency of vibrations on a tight drive belt, and method for performing the vibration frequency measurement, Method for estimating flow by means of radar wave flow meter, The device measured for the frequency of vibration of driving belt being tensioned and for performing the method that frequency of vibration is measured, Device for measuring the frequency of vibration in a tensioned drive belt and method for performing vibration frequency measurement, Device for measuring the frequency of vibrations on a tight drive belt and a method for carrying out the vibration frequency measurement, Gyro sensor module and angular velocity detection method, Method and system for determining position and orientation of an object, Surveying and position measuring instrument with a fan-shapped light beam, Level, angle and distance measuring device, Monitor device that measures and displays the flight characteristics of sports objects, Yield monitoring apparatus, systems, and methods, Laser sensor capable of measuring distance, velocity, and acceleration, Low cost 2D position measurement system and method, Solid state orientation sensor with 360 degree measurement capability, System for determining performance characteristics of a golf swing, Handheld optical distance measurement device, Handheld laser light detector with height correction, using a GPS receiver to provide two-dimensional position data, System, method, device and computer code product for improving the readability of an electronic compass, Gradient sensor and method of using the same, Remote attitude and position indicating system, Method and apparatus to determine the wind speed and direction experienced by a wind turbine, Method of adjusting monitor axis of optical sensors, Golfer's wind indicator and club selection assistance device, Method and apparatus to determine object striking instrument movement conditions, System for using a 2-axis magnetic sensor for a 3-axis compass solution, Information on status: application discontinuation. Open channel flowmeters perform flow measurement of liquids that are open to the atmosphere at some point in the flow measurement path. 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 gun is thus positioned at a vertical angle with respect to the water surface. The electromagnetic flowmeter is capable of measuring flow rates in different water quality conditions, which brings small disturbances to the water flow, and can measure instantaneous flow rates, but the method is susceptible to interference from nearby electromagnetic … 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. 1. At the same time that the microprocessor is receiving a reading from the y-axis sensor, Turning to FIG. Instead, it must be calculated in a process known as stream gaging. Radar has been used for years to determine the speed of moving objects. 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. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SMITH, KIMBLE J.;JANSON, SCOTT D.;SMITH, KEVIN T.;REEL/FRAME:012183/0456;SIGNING DATES FROM 20010909 TO 20010911, Free format text: Streamflow is a measurement of the amount of water flowing through a stream or river over a fixed period of time. 1 there is illustrated a radar gun. For water flowing in a pipe under steady-state conditions (i.e., not changing over time), continuitymeans the water that flows into one end of a pipe must flow out of the other end. Not all flow measuring devices ... wood, or fiberglass and can measure water over a wide variety of flow ranges. 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. Velocity measurement of water flow is an important task in hydrological monitoring [1–3]. 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. means for correcting the calculated velocity to a corrected calculated velocity of the object if the radar device is positioned at the vertical angle with respect to the object. Meters are devices that measure the stream flow by directly measuring the current. 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