Acoustic Doppler Velocimeter (ADV)
The Acoustic Doppler Velocimeter (ADV) is a tool that is designed to record instantaneous velocity components at a single-point with a relatively high frequency. The measurements are performed by measuring the velocity of particles in a remote sampling volume. It consists of a probe head made of 3 to 4 receivers. The measuring distance can be anywhere between 5 and 15 centimeters from the probe head. Figure 1 shows a diagram of a standard ADV. Also, any data taken from an ADV has to be properly analyzed. This is because the ADV is very sensitive to fluctuations and noise, which makes data points taken from any single point unreliable.
Figure 1. A rendering of a standard ADV model
ADV in Manifold Research
The ADV used in for the manifold research was a Nortek Vectrino. It was positioned outside of each port in order to measure the velocity in each jet. Through use and acclimation to this particular model, it was found that the probe head should be positioned approximately 17 cm (instead of the suggested 15 cm) from the sampling volume. Figure 2 shows the position and placement of an ADV in the inlet manifold model.
Figure 2. The ADV positioned outside of a port where the flow rate is being measured.
ADV software
The software required for the specific ADV model can be found through the Nortek Website. The following screenshots show how to set up and change the preferences for the ADV.
This is the front page of the ADV program.
This is what you click to configure the ADV.
This is the configuration page. We used a sampling rate of 16 Hz and a velocity range of 1.0 m/s.
This is where you click to ensure that your computer is communicating with the ADV.
It is important to make sure that the port that the program is reading from is the same port that the ADV is connecting to on your computer. Also, make sure that the baud rates are the same.
This is where you click to record data. The left circle indicates what you click to record data. The right circle indicates where you click to terminate the recording of data.
This is where you click to download data from the ADV when you are done taking measurements. Do this frequently, because the ADV has a limited memory. The program will notify you when it cannot store any more information, and so you should download the data to your computer.
When you are done downloading the data from the ADV to your computer, erase the data from the ADV using this button.