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Non conductive material measurement
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HOW-TO GUIDE NON-CONTACT THICKNESS MEASUREMENT OF MOST INSULATING MATERIALS How to achieve accurate thickness measurements of thin, non-conductive materials such as, Glass, Sapphire, Plastic and other Polymers using MTI capacitance ampliﬁers and capacitance probes. A worldwide leader in precision measurement solutions

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WHAT IS NEEDED for up to 1µm accuracy - Opaque, Translucent or Clear Materials Forms a complete thickness measuring system. System calibration made easy with built in calibration software. Thickness data can be viewed on a PC or stream data directly to a ﬁle. SAPPHIRE WAFERS Product Model Digital Accumeasure D202 Digital Accumeasure D402 Dielectric Probes Op onal Dielectric Fixture Op onal 24VDC Power Supply Op onal Micro USB Cable Dielectric Dielectric Fixture Fixture Probe Holders 2 same probes (selec on below) PRODUCT MODEL ASP-250M-ILA ASP-300M-CTA ASP-400M-ILA ASP-2500M-CTA...

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Capacitance sensors are well known for being able to precisely measure thickness and position of conductive targets. MTI capacitance sensors can also measure the thickness of insulating materials such as sapphire, glass, many plastics and even semi- insulating semiconductors material such as GaAs and silicon nitride with thickness <10mm and uniform dielectric constant. The Digital Accumeasure takes all the guess work out of what used to be a complex measurement. • A is the area of the probe sensing element • d is the gap between the probe and the ground plate or gap between opposing probes...

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MEASUREMENT PRINCIPLES for up to 1µm accuracy - Opaque, Translucent or Clear Materials MTI Digital Accumeasure ampliﬁer is a mul channel digital capacitance gauge that is capable of measuring thickness of semi-insula ng wafers such as high bulk resis vity GaAS. Probe 1 1 to 2.5mm Probe 2 This also includes measuring the thickness of dielectric material such as Sapphire, glass, SiC and other high bulk resis vity materials that exhibit a uniform dielectric constant. T= K [GapTotal-(GapA + GapB)] (1-K) *K= dielectric constant *The greater the dielectric constant the more easily the ﬁeld passes...

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The Accumeasure D series amplifier is a true revolutionary design that uses the latest technology to convert a highly reliable capacitive electric field measurement (displacement) directly into a highly precise 24 bit displacement or thickness reading. Where: ,- Guard e= Dielectric constant of the gap medium, typically air Q IS proportional to D D= Gap distance between the probe and grounded target A= Probe sensing area Our new capacitance amplifier converts the gap capacitance directly to a digital target gap (distance). This direct conversion approach eliminates errors that traditional...

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