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Coating Thickness Measurement with Digital Technology from SI Instruments

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article image Digital Coating Thickness Gauges

ElektroPhysik, through its Australian distributor SI Instruments , has recently released the MiniTest 700 range of Digital Coating Thickness Gauges featuring SIDSP (Sensor-Integrated-Digital-Signal Processing) technology.  

Digital sensors for coating thickness measurement uses magnetic-induction or the eddy currents principle for complete signal creation; measuring and processing unit inside the sensor.

The sensor is able to create all necessary control signals, editing and processing the return measuring signals digitally inside the sensor. Only the completely processed digital coating thickness values are transferred to the coating thickness gauge for display, statistical evaluation and storage.

The gauge is not used for processing the individual coating thickness values; it merely hosts and manages data, displays the data and exports it.

SIDSP-sensors require two analog modules that can be implemented compactly: a driver amplifier for controlling the sensor head and a measuring amplifier to amplify the measuring signal delivered by the measuring head. One single operating voltage is sufficient. Embedded in a microcomputer, the analog-to digital converters create and process the alternating voltage signals required for measurement. The entire measurement is processed at the point of measurement, not in the host gauge.

Because there are less components used with SIDSP, failure frequency is reduced. Combined with signal interference protection, SIDSP digital sensors provide reliability.  

Due to the high reproducibility of SIDSP sensors, one single measurement may be sufficient to provide a reliable result so that in many cases multiple readings may not be necessary. This makes higher productivity easy.

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