US 2026/0202185 A1 · EXTRINSIC FABRY-PEROT INTERFEROMETER METALLIC SURFACE SENSOR

Abstract

The present invention relates to a method of adapting an Extrinsic Fabry-Perot interferometer (EFPI) to measure the distance between a reflective surface of the EFPI and a metal surface. In one embodiment of the invention, the EFPI is embedded into a mold wall and measures the shrinkage gap size formed between a mold wall and a metal surface as the molten metal solidifies. In another embodiment a plurality of EFPI is placed in any array. The EFPI array and a cast metal surface are configured to move relative to each other such that the distance between the cast metal surface and the reflective surface of the EFPI is measured at a plurality of locations. The present invention further relates to an array of a plurality of EFPI.

Claims20

Dependent claims

A method of measuring distance from a metal surface using an Extrinsic Fabry-Perot interferometer (EFPI), comprising:

directing a broadband light source of the EFPI onto a metal surface located at a first position and reflecting the light waves incident thereon to a reflector of the EFPI located at a second position to produce an interference pattern read by a sensor of the EFPI,
generating a signal from the interference pattern read by the sensor corresponding to the distance between the first position and the second position.

A method of measuring the distance from a cast metal surface at a plurality of locations using an Extrinsic Fabry-Perot Interferometer (EFPI), the method comprising:

providing the EFPI comprising a sensor, a reflector, and a broad band light source,
positioning the EFPI such that the broad band light source is generally perpendicularly incident to the surface of the cast metal and reflected back to the reflector of the EFPI to produce an interference pattern read by the sensor of the of the EFPI,
generating a signal from the interference pattern read by the sensor corresponding to the distance between the surface of the cast metal and the surface of the reflector.

Dependencies are inferred from the claim text.

Extrinsic fabry-perot interferometer metallic surface sensor

Life of this patent

Extrinsic fabry-perot interferometer metallic surface sensor

Life of this patent

Abstract

Claims20