INTERFERNG LIGHT

摘要

Micromachined silicon carbide-sapphire fiber-optic pressure sensor operates in 3,600°F environment. Hot enough for you? Acquiring accurate, transient measurements in harsh environments has always taxed the available measurement technology. Until recently, the technology to directly measure certain properties in extremely high-temperature environments has not existed. Advancements in optical measurement technology have led to the development of measurement techniques for pressure, temperature, acceleration, and skin friction using extrinsic Fabry-Perot interferometry (EFPI). The basic operating principle behind EFPI enables the development of sensors that can operate in the harsh conditions associated with turbine engines, high-speed combustors, and other aerospace propulsion applications where the flow environment is dominated by high-frequency pressure and temperature variations caused by combustion instabilities, blade-row interactions, and unsteady aerodynamic phenomena. Using micromachining technology, these sensors are quite small and therefore ideal for applications where restricted space or minimal measurement interference is a consideration.