UVP-XW
UVP-XW is Met-Flow's third generation of instrument. At the time efforts
aimed at integrating the PC interface inside the instrument, yet to achieve
a compact and sturdy device. It could then easily be moved to any location
without having to bring along a cumbersome desktop PC and mastering laborious
communication between both devices.
In spite of the important progress made with personal computers since
then the concept of having a built-in PC is still topical for some users,
especially when the instrument is regularly moved from place to place,
shared between numerous users, or when a dedicated PC is not readily available.
UVP-XW is a stand-alone device ready for instantaneous use.
XW line
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PDF technical flyer: UVP-XW hardware (174 kB)
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XW OPTIONS
XW instruments can be customized according to different options.
Frequency
The UVP-XW line offers either a single emitting frequency instrument (XW-2
model) or a three consecutive frequencies device (XW-3 model), to be selected
out of 0.5 / 1 / 2 / 4 / 8 MHz. XW-2 is preferred when the velocity range
and size is both limited and known in advance, or for limited budget.
XW-3 is the choice of those users who project a wider range of applications.
Multiplexer
An integrated multiplexer is available (MX model) for those users who
wish to carry out multiple probes measurements, either for a measurement
at various locations or to achieve 2D measurements (flow mapping).
The multiplexer features 20 probe channels and can be chosen either internal
for a more compact instrument or external when the access to the measurement
location is difficult.
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XW MODELS
XW-3-MX
This model has three ultrasonic emitting frequencies (select any three consecutive frequencies from 0.5, 1, 2, 4, 8 MHz range) and includes a multiplexer (internal or external). The model is suitable for most demanding scientific and developmental tasks.
XW-2-MX
This model has one emitting frequency (any frequency from 0.5, 1, 2, 4, 8 MHz range) and includes a multiplexer (internal or external). The model is suitable for most demanding scientific and developmental tasks where size and velocity range of targets are known in advance.
XW-3
This model has three emitting frequencies (select any three consecutive frequencies from 0.5, 1, 2, 4, 8 MHz range) but does not have any multiplexer. Nevertheless, it can be upgraded with a multiplexer at a later date. The model is a good starting point for scientific and developmental tasks, which may lead to instrument upgrade in the future.
XW-2
This model has one emitting frequency (any frequency from 0.5, 1, 2, 4, 8 MHz range) but does not include any multiplexer. Nevertheless, it can be upgraded with a multiplexer later. This standard model is well suited for industrial applications and standard laboratory work.
PC & SOFTWARE
The UVP-XW internal PC specifications reflects market developments and are continuously updated to keep pace. The present configuration is:
- Windows NT 4 operating system (full licence)
- 266 MHz Pentium processor
- 128 MB of RAM (expandable to 256 MB)
- 10 GB hard disk drive
- 3,5" floppy drive
- Color TFT 8,4" LCD screen
- SVGA connector to simultaneously drive a second monitor
- Mouse
- Two serial ports
- LAN device (Ethernet 100 base T)
The UVP software first developed for the Windows NT-based UVP-XW is software version 2.1, which is pre-installed standard. The new UVP software generation developed for the UVP-DUO - software version 3 - has been fully adapted to also comply with the UVP-XW driver. It is now available as an upgrade to XW version 2.1, with most functions developed for UVP-DUO, such as:
- Enhanced velocity profile definition (window function), expanded measurable velocity range
- Remote control of UVP-XW from host computer via LAN through TCP/IP protocol
- Turbulent statistics, RMS, skewness, kurtosis, histograms
- Cross-correlation, auto-correlation, power spectrum
- Integrated flow mapping module, on-line transducer grid editor
- Wizard-style measurement parameter setup
- Direct export to Word, Excel, Tecplot and other applications
- New file format with all measurement parameters in a single file
OPTIONAL
MULTIPLEXER
A
single transducer can measure velocity profile in liquid along a single
line. Since measurement and velocity evaluation is very fast, the UVP-XW-MX
instrument with internal or external multiplexer can scan through up to
20 transducers simultaneously and still keep interesting time resolution
sufficient for most flow measurements.
This allows for easy flow field mapping. The sequence and timing of multiplexer
channels are fully programmable.
UVP-XW TECHNICAL SPECIFICATIONS
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Emitting frequency |
Selected from 0.5, 1, 2, 4, 8 MHz |
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Emitting voltage on transducer |
30, 60, 90, 150 V (for 50-Ohm transducers) |
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Emitted cycles per pulse (1) |
2 to 32 cycles, by step of 2 |
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Pulse repetition frequency (2) |
990 Hz to 7400 Hz |
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Number of channels |
Selectable from 10 to 256 channels |
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Receiving amplification |
Exponential, time-dependent, for compensation of distance attenuation |
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Space resolution - longitudinal (3) |
Approx. 0,5 microsecond (transducer-dependant) |
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Space resolution - lateral (4) |
Defined by the transducer used |
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Channel distance |
Variable, from 0,37 mm in water (medium-dependant) |
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Velocity resolution |
1/256 of maximum velocity (1 LSB) |
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Repetition rate (emissions per profile) (5) |
8 to 240, step of 8 |
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Acquisition time per profile (6) |
Variable, minimum approx. 4 ms |
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| Doppler shift detection algorithm | Time domain | |
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Triggering |
External signal (TTL 0-5 V, min 20 ns) or keyboard |
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Time delay between profiles |
0 to 65 000 ms |
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Recording capacity |
As per the internal hard disk capacity |
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Configuration parameters saving |
Unlimited number of configuration files can be saved |
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Operating system |
Windows NT 4 (true multi-tasking) |
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Display |
8,4" TFT Color display (640 x 480 pixels) |
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Communication |
Keyboard, 2 serial ports, 1 parallel port, Ethernet, external SVGA port |
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Interface signals |
Echo (max 0,7 V), pulse repetition frequency, window 'start' gate, trigger input |
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Power supply |
110/220 V, 50/60 Hz |
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Size of instrument casing |
550 x 250 x 470 mm |
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Weight |
18 kg |
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| Operating conditions | Temperature
0 - 40°C, storage -20 - 60°C Relative humidity 30 - 80%, non-condensing |
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Transport packing |
Sturdy aluminium case (on request) |
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(1) Increasing
number of emitted cycles improves signal quality but decreases longitudinal
resolution.
(2) The maximum pulse repetition frequency is limited by the maximum measurable
depth, i.e. by time of flight of ultrasonic signal to a distant point
and back to transducer.
(3) The least number of waves in a pulse is two. Longitudinal space resolution
depends on ultrasonic frequency (wavelength) and also on agility of the
transducer used. Met-Flow transducers are very agile and therefore converge
to the theoretical resolution limit.
(4) For ultrasonic beam divergence values see the Transducers data sheet.
(5) When using high repetition rate (many emissions per profile), sliding
averaging in time is achieved.
(6) Acquisition time depends on the ultrasound flight time to the maximum
depth point and back, and on the repetition rate.
