High temp. displacement indicator for thermal deformation measurement - uses quartz glass measuring element contacting measured object and inductive measuring system

摘要

The displacement indicator uses a measuring element (1) of quartz glass incorporating cooling channels, allowing its use in a range extending from room temp. to 2300 degrees C. The measuring element is coupled via a straight line interface with a non-magnetic rod (6), with an attached armature (4) displaced relative to a coil housing (5). The movement of the rod is guided via at least two spring guides, each with upper and lower springs. Pref. the tip (2) of the measuring element contacting the thermally-loaded measuring object (28) is made of a material with a higher thermo-viscosity limit, e.g. sapphire. ADVANTAGE - Provides accurate measurement under transient conditions, with wide working temp. range.