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Dickenmessung von Polymer Flugzeugwindschutzscheiben


Application: Measurement of individual layers and total thickness in multilayer polymer aircraft windshields.

Background: Multilayer plastic construction is commonly employed by the aerospace industry for aircraft windshields, in which two relatively thick layers of acrylic or a similar hard plastic are typically sandwiched around a thinner layer of a soft material such as polyvinyl butyral (PVB) which provides thermal stress relief. The hard plastic layers are typically about 0.4" to 0.5" (10 to 12.5 mm) thick and the soft inner layer about 0.050" (1.25 mm) thick.

Scratches in aircraft windshields are typically removed by polishing during routine maintenance, after which thickness measurement is required to insure that windshield thickness has not been reduced below a specified minimum. Additionally, manufacturers need to measure the soft PVB middle layer to insure that it is within specified thickness.

Equipment: The Model 38 DL PLUS thickness gage with the Multi-Measurement software option is recommended for measurement of individual layers and total part thickness in this application. With this software, the 38DL PLUS gage is capable of using separately programmed setups (including sound velocity, gain, and blanking settings) for each layer being measured to optimize performance. In this test, the gage is normally used with either an M110-RM (5 MHz) or M112-RM (10 MHz) contact transducer.


Typical Procedure: The waveforms below show simultaneous measurement of all three layers of a typical multilayer aircraft windshield using an M110 (5 MHz) contact transducer. The outside layer is measured in Mode 1, to the first negative echo. The thin middle layer is measured in Mode 2, negative peak to positive peak. The bottom layer is also measured in Mode 2, positive to negative. The small echo just to the left of the detected backwall echo in the bottom screen print is not another layer, but rather a second multiple of the backwall echo from the outer layer.


outside polycarbonate layer


middle PVB layer


bottom polycarbonate layer


As with any ultrasonic thickness measurement, accuracy is dependent on proper sound velocity calibration. Velocity calibration must be performed for each material being measured, on samples of known thickness.

Olympus IMS

应用所使用的产品

Das hochmoderne 72DL PLUS Ultraschall-Dickenmessgerät liefert präzise Dickenmessungen mit hoher Geschwindigkeit in einem portablen, bedienerfreundlichen Gerät. Dieses innovative Dickenmessgerät ist mit Einzelschwinger-Messköpfen bis zu 125 MHz kompatibel und eignet sich zur Messung der Dicke von sehr dünnen Werkstoffen, einschließlich mehrschichtiger Anstrichfarbe, Beschichtungen und Kunststoffen. Es kann die Dicke von bis zu 6 Schichten gleichzeitig anzeigen.

Der 45MG ist ein hochmodernes Ultraschall-Dickenmessgerät mit Standard-Messfunktionen und Softwareoptionen. Dieses einzigartige Dickenmessgerät ist mit allen unseren Sender-Empfänger-Messköpfen und Einzelschwingermessköpfen kompatibel.

Das vielseitig einsetzbare 38DL PLUS Messgerät kann mit Sender-Empfänger-Messköpfen zur Messung korrodierter Rohre bis hin zur sehr präzisen Dickenmessung von dünnen oder mehrschichtigen Materialien mit einem Einzelschwingermesskopf verwendet werden.
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