| 摘要 |
PURPOSE:To improve the accuracy and reliability of strength test by constructing a strength tester such that breakage is detected by measuring light transmitted in an optical fiber. CONSTITUTION:An optical fiber 9 is fixed between sample holders 4 and 5. The tensile speed of a tension device 2 is set by a tensile speed changeover device 12 in a controller 1. The device 2 is operated to apply load to the optical fiber 9. With the application of the load, a timer 14 is operated by a command from a CPU 11 and measuring light is incident into the optical fiber 9 from a light source 8. After transmitted in the optical fiber 9, the measuring light is photoelectrically converted by a photosensitive device 7 and inputted to the timer 14. The load applied to the optical fiber 9 is measured by a load cell 3 and a measured value is fed to the CPU 11. When the optical fiber 9 is broken, the measuring light incident into the optical fiber 9 is scattered in broken portion, thereby no output value is obtained from the photosensitive device 7. Thus, the timer 14 stops the measurement of time, measured time value is inputted to the CPU, input data are operation-processed by the CPU 11 and breaking load and the like are displayed on a display unit 15.
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