coulombméter

A coulombmeter is an instrument used to measure electric charge. It is also known as a charge meter or charge plate analyzer. The unit of electric charge is the coulomb, named after the French physicist Charles-Augustin de Coulomb. A coulombmeter typically works by measuring the voltage across a known capacitor or by integrating the current flowing into or out of a capacitor over a period of time.

Coulombmeters are used in various applications, including electrostatic testing, semiconductor manufacturing, and research laboratories. For instance, in electrostatic testing, a coulombmeter can measure the charge accumulated on surfaces or objects. This is important for understanding and mitigating electrostatic discharge (ESD) risks, which can damage sensitive electronic components. In semiconductor manufacturing, coulombmeters can be used to verify the charge on wafer surfaces or in fabrication processes.

The accuracy and sensitivity of a coulombmeter can vary depending on its design and intended use. Some coulombmeters are designed for general-purpose measurements, while others are highly specialized for specific applications requiring very precise readings. The operational principle often involves sensing the electric field produced by the charge and converting this field into a measurable electrical signal.