Acoustic Current Profiler
Mobile Ultrasonic Current Profiler
The Mobile Ultrasonic Current Profiler is a flow meter that extends the capability of making flow measurements to a range of situations under which standard current meter techniques (mechanical or electromagnetic) cannot be used.The mobile Ultrasonic Current Profiler makes monitoring flow in a natural stream ,concrete channel or partially filled pipe very easy.It is able to accurately and easily measure flow in harsh enviroments and in difficult conditions.This lightweight compact system uses a single tranducer assembly to measure the flow velocity and water level.
The system is designed to measure both ,the vector and magnitude (using twin velocity beams) of individual velocity cells (up to 128) to account for velocity variations within the flow and obtain the flow profile.A hydrostatic pressure sensor is used to measure water level and combined with the velocity profile ,calculates flow easily .
The velocity data from the two profiles are entered into an algorithm to determine a mathematical description
of the flow velocities throughout the cross-sectional of the flow. The result determines flow velocities at all points throughout the flow.
These results are integrated over the cross-sectional to determine the flow. The key benefit to this approach is that the system will operate accurately under different
hydraulic conditions.This eliminates the need of site- specific calibrations.
An ultrasonic transducer transmits two short pulses of ultrasound,which travel along the measurement axis and then switches over to receiver mode.When the ultrasonic pulses hit a small particle or air bubble in the medium, part of the ultrasonic energy scatters on the particle and echoes back.The echoes reach the transducer after a certain time. If the scattering particle is moving with a non-zero velocity into the acoustic axis of the transducer, a time delay between the two echoed signals takes place, and the measured time delay is analyzed by correlation technique for the velocity of the particle or air bubble.The flow meter measures the position and velocity of the particle, and hence establishes the fluid flow component in the given space point. The basic feature of the Acoustic Flow Profiler is the ability to establish the velocity in many separate space points along the measurement axis and develop the flow profile.Each acoustic beam measures velocity at multiple points within the water column. The measured velocity data within each cell are very precise.This distribution of accurate velocity measurements is then used to determine the flow pattern over the entire cross section of flow.Since the flow pattern and measured velocity distribution are dependent on each other, the flow meters advanced flow algorithms automatically adapt to changing hydraulic conditions within the channel. This removes the need for in-situ calibration and ensures accurate flow rate measurement over a host of different measurement environments and hydraulic conditions.
- General Specifications
|Sensor:||2 x velocity,1 x water level,1 x temperature,|
|Range:||± 5 m/s for velocity,0 - 4 m for water level (hydrostatic),0°- 40°C for temperature|
|Max. profiling range:||0 - 3 m,|
|Blanking distance:||0.02 m|
|Minimum cell size:||0.01 m|
|Accuracy:||± 1% of measured value (for value v),± 1% of measured value (for value v)|
|Cable:||5 m from sensor to backpack,optional: 10 m|
|Power Supply:||6000 mAh rechargeable battery pack,+ 24hrs lifetime (sensor&transmitter)|
|Weight:||1.7 kg (sensor incl. 5m cable),1.2 kg (transmitter),1.0 kg (battery pack),0.5 kg (charger)|
|Accessories:||waterproof backpack ,ltra-light wading rod (optional),top-set part for wading rod (optional),top-set part for wading rod (optional),car charger,pole mount for rugged tablet PC|
|Rugged Field PC Specifications||.|
|Display:||WXGA 1,366 x 768,sunlight readable|
|Connection:||WiFi, Bluetooth, GPS, optional WWAN GSM/GPRS,HSPA+, LTE|
|Interfaces:||1 x USB 2.0, 1 x USB 3.0, RS-232, RJ45|
|Operating System:||Windows 8.1 Pro, Windows 7 ,downgrade available|
|Processor:||Quad-core Intel Celeron|