G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 25/16 (2006.01) G01D 5/34 (2006.01)
Patent
CA 2064773
ABSTRACT A laser beam-transmitting section of a laser measuring instrument of dimensional change is arranged at one side of a specimen heating furnace, a laser beam- receiving section is arranged at the opposide side of the furnace, a slit fixture for shielding within-the-furnace radiation heat and light is provided inside a measuring window, a heat insulating material having a slit for shielding within-the-furnace radiation heat and light is provided inside said slit fixture, and a within-the-furnace radiation light shielding slit plate and a within-the- furnace radiation light reducing optical filter are dis- posed at the end faces of said respective laser beam- transmitting section and said laser beam-receiving section whereby measuring errors caused by the light and heat generated within the furnace are prevented (the interior of a specimen heating furance core pipe can be replaced by various kinds of atmospheres as necessary, and it is possible to measure the dimensional change of small-size specimens of ceramics or the like). According to the present apparatus for measuring thermal dimensional change of ceramics or the like, measurement is possible with a resolution of not greater than 0.5 µm.
Fujiwara Teiichi
Hisanari Toshiaki
Mimura Toshisada
Macrae & Co.
Shinagawa Refractories Co. Ltd.
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