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OPCARD - 01/100
Ultrasonic board with integrated pulser and receiver -
Single Channel PCI-bus UT PC-Card
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OPCARD -01/100 is a complete ultrasonic
testing device, suitable for all ultrasonic measurements, and due to
many additional digital inputs/outputs and
internal processor it can
be used as a controller for more complicated devices.
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The card can work together with
following devices:
· 32 channel multiplexer - the card can control it directly;
· Scanner - it has input for incremental encoders;
The card has an implemented one channel pulser & receiver and can be
used with one transducer or with two (one is sending and the second
receiving).
OPCARD -01/100 is a
short PCI card and can be installed in a standard PC.
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| Technical
data |
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A/D converter: |
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- Resolution: |
8
bit |
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- Sampling frequency: |
12.5,25,50
or 100MHz1 |
| Data
buffor |
256,
512, 1K, 2K,4K,8K,16K, 32k, 64k, 128k1 |
| Analog
parameters: |
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- Input amplifier gain: |
from
-20dB to 76dB1 |
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- Input attenuator: |
off
or -20dB1 |
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- Sensitivity: |
0.1mV
- 1Vpp |
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- Bandwidth: |
0.5
MHz - 25 MHz (-3dB) |
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- Input impedance |
50
Ohm, 10pF |
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- Filters switchable |
0.5
- 6MHz1, 0.5 - 10MHz1, 0.5 - 15MHz1,
0.5 - 25MHz1,
1 - 6MHz1, 1 - 10MHz1, 1 - 15MHz1,
1 - 25MHz1,
2 - 6MHz1, 2 - 10MHz1, 2 - 15MHz1,
2 - 25MHz1,
4 - 6MHz1, 4 - 10MHz1, 4 - 15MHz1,
4 - 25MHz1 |
| Pulser: |
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- Pulse Voltage |
off(0V)
to 360V (positive pulse, Short circuit step pulser) |
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- Fall Time |
<=
20 ns |
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- Pulse Duration |
Short
circuit, bandwidth up to about 50MHz |
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- Output impedance |
<
1 Ohm |
| Delay
time: |
Post
trigger 256us, measurement accuracy better than 1ns |
| Data
buffer: |
256,
512, 1K, 2K,4K,8K,16K, 32k, 64k, 128k1 |
| DAC
(TGC) with arbitrary waveform generator |
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- Frequency |
50MHz |
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- Resolution |
8
bit |
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- Max. Gain changing |
48dB
pro step |
| Counters
/ Input for incremental encoder: |
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- Counters for Incremental Encoders 2 channel |
16-bit |
| Trigger |
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- Internal trigger rate |
Software |
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- External trigger rate |
TTL
Signal |
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- Multiplexer control |
Software |
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- Trigger output signal |
TTL
Signal |
| Additional
inputs: |
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- 2 x digital line |
TTL
Signal |
| Output: |
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- 5 x digital line |
TTL
Signal |
| Data
bus: |
PCI
(short card) |
| Transfer: |
Bus
Mastering DMA data transfer |
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1 - software selected |
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Signals on the external connectors |
Lemo:
PE - Measured input signal (sending / receiving);
TT - Measured input signal (receiving);
DB15:
Pin1, 9 - TTL encoder input signals
Pin2, 10 - TTL general input signals
Pin4 - TTL trigger out signal
Pin5, 6, 7, 12, 13 - multiplexer channels control lines
Pin8 - +12V
Pin15 - -12V
Pin14 - GND
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| Characteristic
of the card: |
One of the most important features
of the card is a precise synchronization between the transmitter
trigger signal postTrigger and the moment when the sampling of the
input signal starts.
This
time (postTrigger) is software programmable in the range of 0 –
255us with a resolution of 1us and has stability within the range
of 1ns. It is particularly important in the case of scanning devices,
since it allows to achieve a very small time skew between different
positions (channels). 1ns would correspond to a clock frequency of 1GHz
which is much higher than the actual frequency used.
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| Characteristic
of the pulser on board: |
Pulser circuit waveforms: The rising edge of the
Trigger signal (described as Trigger) initiates the transducer
charging process which takes about 3us. After this time a transistor
switch which discharges the transducer is turned on (discharge time is
about 20ns, but it can be longer, if the capacitance of the transducer
is too large; the limit is reached, if the transducer is made from the
standard ceramics, is 0.1 mm thick and has 8 mm diameter).
Because
of the very low output impedance of the device (<1 Ohm) and short
discharge time the pulse generated with this device could be concerned
as a real pulse answer for the most transducers. Transducers with a
parallel matching inductance should not be used, since they do not
allow the transducer to be pre-charged (the inductance causes a short-circuit).
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| Software
Package |
The software (for Windows
95,98/NT 4.0/2000/XP) includes all necessary functions for ultrasonic measurements.
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Technical description of the OPCARD
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