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 or ASCII format. If desired, the DOP2000 could 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.

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 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.
 
 
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Emission
Emitting frequencies from 0.45 MHz to 10.5 MHz, step of 1 KHz
Emitting power 3 levels
Burst length 2, 4 or 8 cycles
PRF between 64 μs and 10’500 μs, step of 1 μs

Reception
Number of gates between 4 and 1000, step of 1 gate
Amplification (TGC) slope mode, custom mode, variable level between -40 and +40 dB, step of 1 dB
Sensitivity 5 levels, maximum -100 dBm

Resolution
Lateral resolution defined by the transducer
Longitudinal resolution minimum 0.8 μs, 0.6mm (-3 dB)
Spatial filter from 50 KHz to 300 KHz, step of 50 KHz
Time between gates variable, between 250 ns and 20 μs, step of 250 ns
Velocity resolution 1 LSB, result given in a byte format

Ultrasonic processor
Emissions / profile between 8 and 512, any value
Acquisition time/profile variable, minimum value 2 ms
Real time filters moving average, median
Velocity scale maximum: ±11 m/s down to ±1mm/s, sliding origin

Computation
Curve displayed velocity profile
Doppler energy
echo modulus
velocity versus time
flow versus time
histogram
power spectrum of a gate
Statistics mean value, standard deviation, histogram
Utility freeze/run mode
2 cursors

Trigger
Input external signal (TTL) or keyboard action
Condition high, low level, internal pull-up 4 KW
Delay between 1 and 10’000 ms, step of 1ms
Acquisition procedure selectable number of blocks of profiles

Memory
Size Up to 32’000 profiles, step of 1 profile
Configuration 10 saved configurations

Environment
Operating system* Windows 95 or 98
Processor* Pentium MMX, 233 MHz
RAM* 128 Mbytes, optional 256 MBytes
Storage devices* hard disk 20 GBytes
1,44 MBytes Floppy, CD-ROM 44x or CD-RW 2/4/32 in option
Screen 12.4’’ TFT Color display (800x600) VGA
Communication 2 serial ports
1 parallel port
1 ethernet 10 base T, (RJ45)
1 SVGA port (simultaneous)
1 keyboard (miniDIN)
US interface signals echo (max 0.7 Voltp), BNC
synchro pulse (TTL), BNC
trigger input, TTL level, BNC
probe in/out, BNC
probe out, BNC
Power supply 220-110 VAC selectable, 50-60 Hz
Humidity =< 80%
Temperature 5-35 °C
Size 340x265x305 cm
Weight 13 kg

Options
Multiplexer 10 probes, internal or external
Sound speed unit measure the sound velocity within 2%


* may be adapted to the market
All values computed with a sound velocity of 1500 m/s (water), in the direction of the ultrasonic beam