| 摘要 |
PURPOSE:To prevent breakout by boring plural measuring holes to the outside flank of the mold plate of a casting mold, inserting optical fibers therein and detecting temp. by the light energy made incident thereon. CONSTITUTION:The optical fibers 22 are inserted via rods 24 into the plural measuring holes 11a bored into two upper and lower rows on the outside flank of the mold plate 11. The light energy made incident on the fibers 22 through the holes 11a is transmitted to a selector 31. The light energy is successively applied to each radiation thermometer 32 by changing over successively the connecting state of one of the plural optical fibers 22 on the upper or lower side and the optical fiber 31a or 31b by a switching controller 33. The radiation thermometers 32 determine successively the temp. corresponding to the light energy intensity and feed the same to a calculator 34. The calculator 34 makes correction in accordance with the transmission wavelength characteristic of each optical fiber. The corrected exact temp. is displayed on a display device 37 and a CRT 38 so that the temp. distribution in the mold plate 11 is known. |
