Ultrasonic Velocity Profile UVP, Ultrasonic Doppler Velocimeter UDV, Ultrasonic profilometer, acoustic Doppler, DOP2000

The DOP2000 uses pulsed ultrasonic echo technique to measure instantaneously velocity profiles, Doppler energy profiles, echo profiles, spectral density (FFT), histogram and the flow rate in flowing liquids. It computes and displays in real time these data profiles based on the analysis of a user’s specified number of gates placed along the ultrasonic beam.

The digital ultrasonic synthesizer included can generate any emitting frequencies between 0.45 MHz and 10.5 MHz. Associated to this performance, the DOP2000 includes a variable spatial resolution filter that allows to adapt the size of the sampling volume to the application and therefore improves the signal to noise ratio of the measurements.

All the ultrasonic parameters (Frequency, PRF, TGC..) and the processing conditions (number of gates, filters...) are set by the user. The smart trigger capability of the instrument allows to synchronize the acquisition to any periodic or non periodic event. This high flexibility applies to any of the 10 channels multiplexer (available in option) and up to 32’000 profiles could be recorded in binary and/or ASCII format.

If desired, the DOP2000 can record simultaneously two types of data profiles, such as the velocity profiles and the Doppler energy profiles. A separate emitter output connector enables to use two different transducers for emission and reception. This feature allows by means of an external control unit the measurement of a complete 2D or 3D velocity field, which uses the UDVF technique.

Operating in a Windows 9x® environment, the velocimeter can be adapted to your applications with only few mouse clicks. The measured profiles are displayed on a bright 12", 800x600 TFT color screen and are recorded in its internal memory or send through the build-in Ethernet connection to any storage device within few milliseconds.

The key features of Signal Processing's DOP2000 velocimeter

The available emitting frequencies

The emitting frequency is one of the most important parameter. From its selection, the velocity range, the spatial resolution and the measuring range will depend. It is therefore very useful to remove any limitations in its selection. This is why Signal Processing has developed a digital ultrasonic synthesizer, which allows the DOP2000 velocimeter to use any emitting frequency between 0.45 MHz and 10.5 MHz, covering most of the possible applications of ultrasonic Doppler velocimetry

The sensitivity

The sensitivity is a very important parameter because it influences the range of possible application of the instrument. A high sensitive instrument allows measurements in liquids containing few particles and/or in liquids having high attenuation coefficient. The sensitivity is defined as the minimum instantaneous power of the Doppler echoes from which Doppler information can be extracted and is expressed in dBm (reference power 1mW on a 50 ohm impedance).

Unfortunately, for most ultrasonic Doppler instruments find on the market, any numbers characterizing the sensitivity are not given. This makes the comparison difficult. Signal Processing has a put a lot of effort to offer very high sensitive instruments. This is why when many other instruments failed our DOP velocimeter still deliver quality information.

The resolution

The definition of the thickness of the sampling volumes are not only defined by the ultrasonic burst length as it some times mentioned. This would be the case only if the electronic bandwidth of the instrument was infinite. Of course this is never the case and all ultrasonic instruments owns filters to rejected unwanted noise level. This bandwidth reduction defines the minimum thickness of the sampling volume. In order to realize the best compromise between the noise level and the desired resolution, our DOP velocimeter can modify both the burst length and the bandwidth of the receiver stage.

More than one instrument

Our DOP velocimeters do not only measure velocity profiles. They also compute and display in real time other data profiles such as the echo, the Doppler energy and the power spectrum of a gate. By using available accessories, our instrument can measure the sound velocity in any liquid, or could be transformed in a complete acquisition system, capable of controlling up to 10 ultrasonic probes independently, each probes having its own set of parameters.
The way we design our velocimeter offers to our customers a very versatile instrument that allows for instance to collect and record raw data they can send us via emails. This opens the possibility to evaluate any customer's processing methods and ideas, and therefore to advise them so that they can improve the way they use their DOP velocimeter.

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	The available emitting frequencies The emitting frequency is one of the most important parameter. From its selection, the velocity range, the spatial resolution and the measuring range will depend. It is therefore very useful to remove any limitations in its selection. This is why Signal Processing has developed a digital ultrasonic synthesizer, which allows the DOP2000 velocimeter to use any emitting frequency between 0.45 MHz and 10.5 MHz, covering most of the possible applications of ultrasonic Doppler velocimetry
	The sensitivity The sensitivity is a very important parameter because it influences the range of possible application of the instrument. A high sensitive instrument allows measurements in liquids containing few particles and/or in liquids having high attenuation coefficient. The sensitivity is defined as the minimum instantaneous power of the Doppler echoes from which Doppler information can be extracted and is expressed in dBm (reference power 1mW on a 50 ohm impedance). Unfortunately, for most ultrasonic Doppler instruments find on the market, any numbers characterizing the sensitivity are not given. This makes the comparison difficult. Signal Processing has a put a lot of effort to offer very high sensitive instruments. This is why when many other instruments failed our DOP velocimeter still deliver quality information.
	The resolution The definition of the thickness of the sampling volumes are not only defined by the ultrasonic burst length as it some times mentioned. This would be the case only if the electronic bandwidth of the instrument was infinite. Of course this is never the case and all ultrasonic instruments owns filters to rejected unwanted noise level. This bandwidth reduction defines the minimum thickness of the sampling volume. In order to realize the best compromise between the noise level and the desired resolution, our DOP velocimeter can modify both the burst length and the bandwidth of the receiver stage.
	More than one instrument Our DOP velocimeters do not only measure velocity profiles. They also compute and display in real time other data profiles such as the echo, the Doppler energy and the power spectrum of a gate. By using available accessories, our instrument can measure the sound velocity in any liquid, or could be transformed in a complete acquisition system, capable of controlling up to 10 ultrasonic probes independently, each probes having its own set of parameters. The way we design our velocimeter offers to our customers a very versatile instrument that allows for instance to collect and record raw data they can send us via emails. This opens the possibility to evaluate any customer's processing methods and ideas, and therefore to advise them so that they can improve the way they use their DOP velocimeter.