| 摘要 |
A device is provided with a measurement window, which is provided in a heat treat furnace and which permits direct visual observation of a surface to be measured of a heat-treated workpiece, and a temperature sensor, which is provided outside the measurement window and which is capable of carrying out noncontact measurement of the surface temperature of the surface to be measured through the measurement window. The temperature sensor has a measurement wavelength range in which the absorptivity by water is low (e.g., 1.95 mum to 2.5 mum). Further, the measurement window is composed of a window material having a high transmittance in the measurement wavelength range (e.g., germanium). |
