| 摘要 |
PURPOSE: A length measuring device for a slab is provided to measure the length of a slab with an optical sensor unit, thereby improving a quality of a product by enhancing measurement accuracy. CONSTITUTION: A length measuring device for a slab comprises an optical sensor unit(20), a mounting unit(30), and a reflecting unit(70). The optical sensor unit irradiates lights and senses. The mounting unit is installed on a first position of a slab. The reflecting unit is installed on a second position of the slab facing to the mounting unit and reflects the lights irradiated from the optical sensor unit to the optical sensor unit.
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