| 摘要 |
PURPOSE:To facilitate the measurement of temperature in a wide range, by attaching thin metal to a gage base made of an insulating brittle material, breaking the metal foil together with the gage base at a value exceeding the limit strain, and measuring the amount of change in electric resistance. CONSTITUTION:A ceramic material is used as an insulating brittle material, which is broken at a value exceeding the limit strain for a gage base 2. A thin metal 3 made of a conductor of nickel chromium alloy or the like is attached to the ceramic gage base 2. When strain is applied to a strain gage and the strain exceeding a limit is yielded, the ceramic gage base 2 is broken. Since the strain is concentrated at the broken part of the gage base, the metal foil 3 is broken at the corresponding part of the strain concentration. Owing to the breakdown of the metal foil 3, the amount of change in electric resistance between gage terminals 6 moves to the state, at which the amount is increased to infinity in a step state, from the state, at which the amount is increased in proportion to the magnitude of the applied strain.
|
