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Precise thickness measurement of soft materials by means of contact stylus instruments

Date:
June 24, 2013
Source:
Physikalisch-Technische Bundesanstalt (PTB)
Summary:
In microsystems, metallic components are increasingly replaced by components made of inexpensive polymers. As polymers yield when they are subjected to pressure, the layer thicknesses cannot be measured with sufficient accuracy by means of conventional contact stylus instruments. But precision is of decisive importance in microsystem technology. Now, industrial enterprises which measure the thickness of soft polymer layers on hard substrates will be able to correct their measurement results by means of a formula.

Simplified representation of a probe which delineates the surface of a component. To be able to precisely measure also the height of small components made of polymers, the manufacturers need a new procedure.
Credit: PTB

In microsystems, metallic components are increasingly replaced by components made of inexpensive polymers. As polymers yield when they are subjected to pressure, the layer thicknesses cannot be measured with sufficient accuracy by means of conventional contact stylus instruments. But precision is of decisive importance in microsystem technology. Here, the scientists of the Physikalisch-Technische Bundesanstalt (PTB) come into play: In the medium term, industrial enterprises which measure the thickness of soft polymer layers on hard substrates will be able to correct their measurement results by means of a formula.

From the motion sensor to the computer chip -- in many products of daily life components are used whose functioning is based on smallest structures of the size of thousandths of millimetres. Here, the measurements must be exact so that in the end, the overall system will work smoothly. To be able to continue to measure also thin layers of elastic polymers on hard substrates dimensionally by means of contact stylus instruments, PTB has developed a procedure for the correction of the measurement results in cooperation with other European metrology institutes. The scientists have mainly investigated the properties of the widely used Photoresist SU-8® as well as the Polymer Ormocomp® used for the manufacturing of microoptics.

In the case of such soft materials, the contact force, the stylus tip radius and the traverse speed have an influence on the deformation of the component and, thus, on the measurement result. Hence, for the modelling of the observed systematic errors of tactile layer thickness measurements, a model with nonlinear strain hardening has been chosen which takes into account elastic, plastic and viscous deformations. In a next step, the viscoelastic-plastic model will be extended so that the ageing of polymers can also be taken into account.

On the one hand, the results of this work shall enter into a standard and, on the other hand, they shall supply industry with a practical auxiliary means to correct their measurement results. The research work takes place within the scope of the international MeProVisc project (dynamic mechanical properties and long-term deformation behaviour of viscous materials) which forms part of the European Metrology Research Programme (EMRP) and will presumably have been completed by the end of 2014.


Story Source:

The above story is based on materials provided by Physikalisch-Technische Bundesanstalt (PTB). Note: Materials may be edited for content and length.


Journal Reference:

  1. Uwe Brand, Erik Beckert, Andreas Beutler, Gaoliang Dai, Christian Stelzer, Andreas Hertwig, Petr Klapetek, Jürgen Koglin, Richard Thelen, Rainer Tutsch. Comparison of optical and tactile layer thickness measurements of polymers and metals on silicon or SiO2. Measurement Science and Technology, 2011; 22 (9): 094021 DOI: 10.1088/0957-0233/22/9/094021

Cite This Page:

Physikalisch-Technische Bundesanstalt (PTB). "Precise thickness measurement of soft materials by means of contact stylus instruments." ScienceDaily. ScienceDaily, 24 June 2013. <www.sciencedaily.com/releases/2013/06/130624075734.htm>.
Physikalisch-Technische Bundesanstalt (PTB). (2013, June 24). Precise thickness measurement of soft materials by means of contact stylus instruments. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2013/06/130624075734.htm
Physikalisch-Technische Bundesanstalt (PTB). "Precise thickness measurement of soft materials by means of contact stylus instruments." ScienceDaily. www.sciencedaily.com/releases/2013/06/130624075734.htm (accessed October 22, 2014).

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