Patent ID: 11840923

Abstract:
Layered coating applications for sensing telemetry are provided. An example method can include depositing, on a surface of a tool, a waveguide including a first layer of low refractive-index material, a second layer of high refractive-index material applied to a surface of the first layer, and a third layer of low refractive-index material applied to a surface of the second layer; configuring an evanescent wave interaction region on the waveguide, the evanescent wave interaction region including the first layer of low refractive-index material, the second layer of high refractive-index material, and an outer layer of low refractive-index material having a reduced thickness; configuring, at a second location of the waveguide, a non-uniformity configured to reflect light; determining characteristics of the reflected light after traveling through the evanescent wave interaction region; and based on the characteristics of light reflected by the non-uniformity, detecting characteristics of an environment of the tool.