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most advanced ultra-sonic test system for accurately identifying
basic characteristics of coarse grained materials.
Technical
The velocity of ultrasonic energy pulses travelling in a solid material
are related to the density and elastic properties of the material.
The pulse velocity is thus a measure of density and elastic properties
of the material.
In transmitting ultrasonic energy through a coarse grained material
such as concrete, ceramics or wood, it is necessary for the wave
length of energy to be greater than the diameter of the largest
grain particle. If it is not, all of the energy will be reflected
back by the particles and none will reach the receiver.
Typically, the 150 KHz transducers are used for ceramic testing
– the signal wave length is about 1.4 inches (34mm). Finer
materials require higher frequencies for opti-mum resolution.
The basic Ultrapulse™ System contains a transmitter, a receiver
and a very accurate high speed electronic clock. The transmitter
generates an electrical pulse, which when applied to a transmitting
transducer, converts the electrical energy into a pulse of ultrasonic
mechanical vibration. This vibration is coupled with the speciman
under test by placing the transducer in contact with the speciman.
At another selected point on the speciman another receiving transducer
is coupled by mechanical contact. Each transmitted pulse of energy
registers on the high speed clock. The first energy
wave reaching the receiving transducer is converted back to an electrical
signal and turns off the clock. The elapsed time is displayed on
the LCD in 0.1 microsecond increments.
The large LCD display has a graphic display of waveform in the
lower half of the LCD with option for displaying the envelope of
the received signal or expanded front end of the signal.
The hand-held terminal is an external input device; it facilitates
input of:
- Distance between transducers.
- English or Metric Units.
- Density differences.
- Moisture correction.
- Selection of P or S wave transducers.
Enabling the following to be done automatically:
- Calculation of ultrasonic pulse velocity
- Calculation of Poissons Ratio
- Calculation of modulus of elasticity
- Finally, the hand-held terminal with RS-232 adaptor
- enables stored data to be uploaded to a P.C.
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