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AssigneeShinagawa Refractories Co., Ltd.
InventorsTeiichi Fujiwara, Toshisada Mimura, Toshiaki Hisanari
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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 disposed 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 furnace 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 .mu.m.
An apparatus for measuring thermal dimensional change of ceramics and the like, comprising a furnace for heating a specimen to be tested, a furnace core pipe passing through said furnace for receiving the specimen to be tested and including end faces at opposite ends thereof and measuring windows provided at said end faces, a laser dimensional change measuring instrument for measuring thermal dimensional change including a laser-beam transmitting section arranged at one end of said furnace core pipe and a laser beam-receiving section arranged outside the other end of said core pipe, a within-the-furnace radiation heat and light shielding slit metal fixture provided inside each of said measuring windows, a heat insulating material disposed inside said slit metal fixture and including a within-the-furnace radiation heat and light shielding slit, and a within-the-furnace radiation heat shielding slit plate and an optical filter arranged respectively at the end faces of said laser beam-transmitting section and said laser beam-receiving section.
Dependencies are inferred from the claim text.