| 摘要 |
PROBLEM TO BE SOLVED: To objectively evaluate a birefringence phenomenon caused by the surface stress of an object to be measured with rising temperature.SOLUTION: A birefringence evaluation device 10 is composed of a holding part 30 for the object to be measured 20, a first and a second polarizations plate 40, 50, a light source 60, a heating part 70, a temperature measuring device 80, a stress measuring device 90, an illuminometer 100, an image sensor 110, a storage part 120, a control part 130 and a monitor 140. The control part 130 heats the object to be measured 20 to an optional set temperature by the heating part 70, performs a control processing of storing each measured signal to the storage part 120 with the input of each of the measured signals of the temperature, stress, illuminance and image data, and performs an evaluation processing of the birefringence phenomenon. Further, the control part 130 displays the results (each of the measurement values, image data, evaluation level) of the birefringence evaluation processing for each set temperature in the monitor 140 associating with each temperature. |
