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Essential Details of Ultrasonic Thickness Gauge

May 20th 2020 at 3:07 AM

The ultrasonic gauge is widely used for Non-destructive Testing. It is one of the most reliable and fastest ways to measure the thickness of a material. The instrument is a hand-held device that is portable and can be used for measuring the thickness of the material from one side.

Here are a few essential details of the ultrasonic thickness gauge:

  1. The ultrasonic gauge can be used for measuring the thickness of any kind of material. From metals to ceramics, glass, plastics, fibreglass, composite materials, the device can be used for measurement of coatings, individual layers in fabrications that have multiple layers of fabrication.
  2. In fact, this device is so versatile that it can be used for measuring even liquids and biological samples.
  3. In order to use the ultrasonic gauge for thickness testing, the test piece is not required to be cut or divided into sections and coating is not required to be removed for painted structure. This is why it is called a non-destructive testing method.
  4. One of the most effective applications of ultrasonic thickness gauge is measuring the thickness of walls of pipes and tanks.
  5. Materials like wood and paper that are poor conductors, which high-frequency sound waves cannot be measured using the ultrasonic gauge.

Working principle of the gauge

  1. Ultrasound is nothing but sound waves at higher frequencies. Ultrasonic waves cannot be heard by human beings.
  2. Ultrasonic pulse is transmitted into the material to be measured and travelled through towards the other side.
  3. Most materials that are measured using the ultrasonic gauge are measured in the frequency range between 500 KHz and 20 MHz.
  4. The device measures the time taken by an ultrasonic sound wave within a test piece. It captures the sound travels within a material and reflects or echoes from the boundary.

There are three ways to calculate the time taken by the sound waves to travel.

1)  The first mode is the measurement of the time duration between the first generation of the pulse and the first echo that comes back.

2)  The second mode calculates the time interval between the first echo and the first back wall echo.

3) The third mode involves calculating the time between the first back-wall echo and the next one.

Essentially, there are two types of ultrasonic gauges. One is the corrosion gauge and the other is the precision gauge. Choose one as per the requirement of your industry.

About the author

PCTE Industrial specialise in sale and hire of industrial non-destructive testing (INDT) equipment. PCTE INDT is a branch of PCTE, who have been serving in the NDT industry since 2008.We offer a range of INDT equipment that covers the bread and butter applications, with addition of exciting technology. Our range covers devices for Ultrasonic Testing (UT), Eddy Current (ET), Magnetic Particle (MT), Dye Penetrant (DT) and Visual Testing (VT).

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