couplant


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couplant

[′kəp·lənt]
(engineering)
A substance such as water, oil, grease, or paste used to avoid the retarding of sound transmission by air between the transducer and the test piece during ultrasonic examination.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Adequate couplant is applied, squeezed with force in compression and in shear, then fix the sensor with a spring and/or a holder, or by winding tape over the sensor.
In the beginning of the experiment, the couplant is smeared uniformly onto the interface between the specimen and the transducer.
Many ultrasonic NDT methods use couplants between the material under a test and ultrasonic transducers.
While the screws are being tightened this rubber or putty will compact and the ultrasonic transducer will be forced upward in contact with the top of the attachment, completely mating it with the top surface and wringing it with the required ultrasonic couplant. The rubber or putty will also provide thermal insulation from the heat source underneath the ultrasonic transducer.
The contact between the sensors and sample was improved using ultrasonic couplant. The saturated and oven dried samples were measured in accordance with that proposed by ISRM (1978).
Step 4: The ultrasonic wave form is recorded for each segment which covers the whole area of the workpiece by using ultrasonic flaw detector with constant parameters such as range, gain and velocity of the couplant.
A high-resolution linear array transducer of 7-13 MHz with a relatively small footprint is ideal, using acoustic gel as the couplant, but such transducers have only 4-5 cm depth of penetration.
The first reflection is from the interface between the water couplant and top surface of the PEM.
On observe qu'alors que le modele non inhibe de substrat classique de Monod peut etre utilise a des fins de simulation pour la biodegradation de l'anthracene, le comportement reactionnel de la bioremediation de sol peut s'exprimer en couplant l'equation classique de Monod avec une cinetique de degradation des cellules au premier ordre.
The unit is packaged in a compartmentalized and padded carrying case along with the transducer set, a 20-ft interconnection cable, one tube of acoustic couplant, and mounting hardware.
Each sticker protruded slightly from the load and had attached (using a constant force spring) an AET175 kHz transducer, using grease couplant. The output from the transducer was fed to 60 dB preamps with 125 to 250 kHz filters, and then to an AET5500 computerized amplifier and data acquisition system.