| 摘要 |
PURPOSE:To enable observation in a temperature range from normal temperature to 1,200 deg.C, by arranging quartz glass, heat ray reflection glass, heat ray absorption glass and a heat ray transmission mirror sequentially on the optical path of a light beam incident from a case front to a camera. CONSTITUTION:A cooling water flowing in at a cooling water inlet 11 cools a support pipe 3, runs into a video camera case 2 passing through a water hose 4 to cool it and drains from a drain pipe 5. Air flowing in through a compressed air inlet 12 cools the inside of the case 2 and is discharged outside passing through a slit 10 in the perimeter of a glass system. Then, light beam entering the case from a glass surface, first, passes through quartz glass 6, reflected on a heat ray reflection glass 7, further advances to a heat ray absorption glass 8, reflecting or absorbed and moreover, after passage therethrough, light with a large wavelength alone is transmitted through a heat ray transmission mirror 9 so that a visible light beam alone is reflected and reaches a video camera 1. A lighting lamp 13 is provided and a supply voltage is remotely controlled with a brightness adjusting transformer 14 to adjust the brightness. |
