High-temperature extensometer

Extensometer measurement apparatus to measure thermally or mechanically induced extensions in the range of high temperatures of a test specimen up to about 2300.degree. C., with a preferable working range from room temperature to about 1600.degree. C., and with an application range of pressures from vacuum to about 100 bar, characterized by the combination of the following features:

• an inner frame;
• two inner blocks respectively spacially mounted in said inner frame separated by a distance l, said two inner blocks each mounted for independent rotation about their respective axes aligned with a reference direction Y in orthogonal directional axes references X, Y, Z;
• two measurement probes coupled to a sensor for generating measurement signals, each measurement probe respectively mounted in one of said inner blocks;
• an outer frame surrounding said inner frame, said inner frame rotatably mounted in said outer frame so as to be rotatable about said orthogonal directional axis reference X;
• an outer block, said outer frame rotatably mounted in said outer block so as to be rotatable about said orthogonal directional axis reference Y;
• a housing adapted for mounting said outer block therein;
• a shaft mounted in said housing, said outer block movably mounted on said shaft for movement along said orthogonal directional axis reference Z;
• and
• means for supplying cooling liquid to said housing for cooling said sensor.