Design and performance of a microwave strain measuring system for materials tests
Abstract
Development of a microwave frequency sensor and associated instrumentation for deformation measurements, with a microwave cavity resonating in circular TE113 and TM110 modes as strain sensor, is described. The functioning of the microwave measuring system is demonstrated in a tension test and a creep test. The tension test, staged at room temperature, provided a comparison of microwave sensor measurements and electrical resistance strain gage measurements. The capability of the system for elevated-temperature measurements was evaluated in the creep test. The strain measuring sensitivity (one millionth) and accuracy (1% of the measured value) of the microwave sensor system are equivalent to those of standard electrical strain gages at room temperature, and the high-temperature creep tests yielded performance data of the same order.
- Publication:
-
Nuclear Technology
- Pub Date:
- November 1976
- DOI:
- 10.13182/NT76-A31689
- Bibcode:
- 1976NucTe..31..264B
- Keywords:
-
- Materials Tests;
- Microwave Sensors;
- Strain Gages;
- Stress Measurement;
- Cavity Resonators;
- Creep Tests;
- High Temperature Tests;
- Tensile Tests;
- Instrumentation and Photography