Abstract: A prism coupling system configured to determine at least one stress characteristic in a chemically strengthened substrate having a surface and a near-surface waveguide has a a light source system that generates measurement light. A coupling prism provides optical coupling of the measurement light into and out of the near-surface waveguide over an optical path that comprises a low-angle region and a high-angle region. A detector system arranged to receive the measurement light from the coupling prism to detect a mode spectrum image. A light-blocking member is operably disposed to at least partially extend into the low-angle region without extending into the high-angle region to increase or optimize the contrast of the mode spectrum image.

Abstract: Operational status information associated with a process entity in a process plant is received. The operational status information is mapped into one of a plurality of status conditions. Then, an alert message associated with the process entity is generated, where the alert message is indicative of the one status condition of the plurality of status conditions.