| 摘要 |
PURPOSE:To obtain the title high-quality matrix by installing filters having mutually identical flow coefficient on the upstream and downstream parts of a reaction chamber to bring gas stream in a perfect laminar flow state. CONSTITUTION:Using a feed fan 8 equipped on the upstream side and an exhaust fan 9 onthe downstream side, air feeding and exhaustion are made at a constant gas flow. The upstream and downstream parts of a reaction chamber 7 having invariant sectional area and circular shape are respectively equipped with filters 5A and 5B with mutually identical flow coefficient, to accomplish dust removal and bringing gas stream to a laminar flow state by its speed set at 0.05-1.5m/s. The inside of the reaction chamber 7 is equipped with (A) a starting material 3 supported so as to be free in advance and retreat thereof across the gas flow route and also free in rotation thereof and (B) a burner 2, facing to said material 3, for allowing glass soot to be deposited thereon, thereby providing ensuring stable and fluctuation-free burning flame for glass material to be ensured the continuation, thus obtaining the objective high-quality matrix 1 with desired refractive index distribution. |
