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Thickness Measurements and Flaw Detection of Ceramics. Its 38dl plus case is designed to meet IP67 requirements to withstand the rigors of very wet or dusty environments. Olivier Martin. Contact Form. Product Details.

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These transducers are available in a wide range of frequencies, diameters, and connector styles. When this is the case, the message shown in Figure on page 67 appears momentarily on the help text bar see section 8. Figure The calibration lock message 5. Calibration The accuracy of any ultrasonic measurement is only as good as the accuracy and care with which you calibrate the instrument. In some cases, it may be desirable to optimize these setups for specific measurement situations. In all 38dl plus, it is essential that you perform the velocity and zero calibrations whenever the test material or transducer is changed.

Periodic checks with samples of known thickness are recommended to verify that the gage is operating properly. Surface roughness of the test piece The best measurement accuracy is obtained when both the front and back surfaces of the test piece are smooth. When the contact surface is rough, the minimum thickness that can be measured will be increased because of sound reverberating in the increased thickness of the couplant layer. Additionally, when the two test piece surfaces are rough, the slightly different multiple sound paths seen by the transducer may cause distortion in the returning echo, resulting in measurement inaccuracies. Coupling technique In mode 1 contact transducer measurements, 38dl plus couplant layer thickness is part of the measurement and is compensated by a portion of the zero offset.

A, June 68 Chapter 5 maximum accuracy is to be achieved, then the coupling technique must be consistent. In order to accomplish consistent measurements, use a couplant of reasonably low viscosity; employ only enough couplant to achieve a reasonable reading; and apply the transducer with uniform pressure.


Practice will show the degree of moderate to firm pressure that produces repeatable readings. In general, smaller diameter transducers require less 38dl plus force to squeeze out the excess couplant than larger diameter transducers.

In all modes, tilting the transducer distorts echoes and causes inaccurate readings, as noted below. Curvature of the test piece A related issue to this section involves the alignment of the transducer with respect to the test 38dl plus.


When measuring on curved surfaces, it is important that the transducer be placed approximately on the centerline of the part and held as steadily to the surface as possible. In some cases, a spring-loaded V-block holder may be helpful for maintaining this alignment. In general, as the radius of curvature decreases, the size of the transducer should be reduced, and the more critical transducer 38dl plus will become. For very small radii, an immersion approach is necessary. In some cases it may be useful to observe the waveform display as an aid in maintaining optimum alignment.

Practice the best way to hold a transducer with the aid of a waveform display.

On curved surfaces, it is important to use only enough couplant to obtain a reading. Excess couplant forms a fillet between the transducer and the test surface where sound reverberates and possibly creates 38dl plus signals that may trigger false readings. Taper or eccentricity If the contact surface or back surface of the test piece is tapered or eccentric with respect to the other, the return echo is distorted due to the variation in sound path across the width of the beam.


The accuracy of the measurement is reduced. In severe cases, no measurement is possible.

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Acoustic properties of the test material There are several conditions found in certain engineering materials that can potentially limit the accuracy and range of ultrasonic thickness measurements: Sound scattering: In materials such as cast stainless steel, cast iron, fiberglass, and composites, sound energy 38dl plus from 38dl plus crystallites in the casting or boundaries of dissimilar materials within the fiberglass or composite. Porosity in any material can have the same effect.

Adjust the instrument sensitivity to prevent detection of these spurious scatter echoes.The 38DL PLUS is an innovative instrument that 38dl plus a new era in ultrasonic thickness gaging. Ideally suited for almost every ultrasonic thickness application, this handheld thickness gage is fully compatible with a full line of dual and single element transducers. The 38DL PLUS is an innovative instrument that signals a new era in ultrasonic thickness gaging. Ideally suited for almost every ultra- sonic thickness.

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