Isa Albanna
Sistem Komputer-Institut Teknologi Adhi Tama Surabaya
Jl. Arief Rahman Hakim No.100 Surabaya
Email : [email protected]
ABSTRACT
Interdigital sensor capacitor (IDC-S) is a sensor-based non-destructive testing (NDT), which is able
to change the value of physical parameters into electrical quantity (capacitance). The design of the sensor
IDC-S in this research aim for units of measure the water content in the brick production. The general
objective of this research is perform data acquisition from sensor model IDC-S in the implementation of the
measurement of water content. Water is a material that has a dielectric value. Interaction of dielectric
material and the electric field which is transmitted by electrode sensor coplanar IDC-S will be able to
change the capacitance value. The first stage in the research is FEM numerical model simulations IDC-S
using software Agros2D. The simulation results show the potential distribution around cover the electrodes.
In the simulation contours there is no a potential overlap between the electrodes. Process of testing
conducted by two methods: static and dynamic. In the static testing method measurement capacitance value
to variation of water content. Capacitance measurement in a static method is done by standard
instrumentation RCL Meter PM-6303A Fluke-Phillip. Data obtained capacitance value of about 8.2 pF –
45.5 pF (the water content of 0% – 70%). The second method is the measurement of capacitance values by
utilizing a square signal. The results of analysis exponential function from the measured signal outputs
obtained large capacitance is 9.4 pF-43.9 pF. Capacitance measurement values in the dynamic method is
influenced by low frequency noise, which is identified through FFT spectrum analyzer SR 770. The research
is expected that IDC-S sensor can be implemented for measurement of of water content of brick based on
NDT.
Keywords : Interdigital capacitor, capacitive, Sensors, Electrodes, Dielectric Materials