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The Basics of Calibrating a UT Instrument

In any measurement equipment, the right calibration is important. The subject of calibrating any UT (ultrasonic) instrument is quite a complex subject, but it must be well understood. Default factors are very adequate so that any further calibration is not required for many applications. However, when dealing with the highest precision, this instrument must be calibrated properly.

People often end up confused when learning the right calibration of a UT instrument as different factors affect it. First, transducer calibration should be studied, and its main aim is establishing the y-intercept of time versus a length graph. In practice, it’s often accomplished simply by measuring the test samples of sound velocity and known lengths. When calibrating it, use a mater bolt as your reference standard if you have any problems with either your UT instrument or a transducer.

Next, velocity calibration should be masters, and it’s often included in the transducer one, so users should recognize their differences. Modern UT instruments are quite accurate and stable. It’s advisable to use special calibration blocks to verify and check whether their velocity is within tolerance. Normally, velocity doesn’t vary a lot, but it still may cause a lot of trouble when calibrating UT instruments. Having the wrong one will have a negative impact on their future use.

Stress factor calibration is another important factor, and it’s about a ratio of the mechanical length changes divided by UT length changes. This area is also quite confusing for many people, but they need to understand it well. The sound velocity drops because of density changes, and it results in apparent and fast UT length changes. Some materials have different stress factors, while they are almost constant for steel. When doing extremely exacting works, a stress factor can be calibrated on the samples of actual instruments used.

Finally, there is temperature factor calibration that shouldn’t be overlooked. Usually, temperature chances so that it must be compensated. Changes in the temperature of UT instruments affect their length, but this elongation can be corrected. Their average temperature is hard to get under specific circumstances, so small temperature changes aren’t so important. In practice, this calibration of UT instruments is done only when some extreme temperature ranges are used.

In any measurement equipment, the right calibration is important. The subject of calibrating any UT (ultrasonic) instrument is quite a complex subject, but it must be well understood. Default factors are very adequate so that any further calibration is not required for many applications. However, when dealing with the highest precision, this instrument must be calibrated properly.

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Assignment ID
100004106
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CREATED ON
28 February 2017
COMPLETED ON
1 March 2017
Price
$18
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