Development of Adapted Capacitance Manometer for Thermospheric Applications

Abstract

An adapted capacitance manometer is a sensor composed of one fixed plate and one movable plate that is able to make accurate pressure measurements in a low pressure environment. Using detection circuitry, a change in capacitance between the two plates can be measured and correlated to a differential pressure. First, a high sensitivity manometer is produced that exhibits a measurable change in capacitance when experiencing a pressure differential in a low pressure space environment. Second, an accurate and precise detection circuit is identified to measure the change in capacitance. Both, the manometer and the detection circuitry, are tested separately and together to confirm accurate measurements when experiencing small pressure differentials. The manometer shows low sensitivity at the desired differential pressure range but reacts predictably when compared to simulations. The manometer also shows an unexpected correlation in capacitance change to temperature change.