| 摘要 |
PURPOSE:To obtain the titled level meter reduced in heat loss, by mutually arranging a laser irradiation part and a laser receiving part so as to provide a definite distance therebetween and making the irradiation angle of the laser irradiation part variable to detect an angle. CONSTITUTION:The laser beam 5 of a laser irradiation part 11 is allowed to be incident to a reference surface 13 to be reflected at a point P0 and the reflected beam 16 thereof is received by a laser receiving part 12. The laser beam 17 of the laser irradiation part 11 is allowed to be incident to a falling surface 14 in the same way to be reflected at a point P1 and the reflected beam 18 thereof is received by the laser receiving part 12. Herein, the displacement (h) from the reference surface 13 to the falling surface 14 represented by formula (wherein h is the distance from the point P formed by connecting the leading end part of the laser irradiation part 11 and that of the laser receiving part 12 to the molten glass falling liquid surface 14, h0 is the distance from the point P to the reference liquid surface 13, d is each of the distances from the point P to the laser irradiation part 11 and the laser receiving part 12 and theta is the angle formed by laser beam and the falling surface). Because d and h0 are determined by a setting condition, the displacement (h) is calculated by detecting the irradiation angle theta. |
