APPARATUS FOR SHIFTING REFERENCE DISTANCE OF LASER DISPLACEMENT SENSOR WITH PLATE-TYPE TRANSPARENT MEMBER HAVING REFRACTIVE INDEX LARGER THAN THAT OF AIR IS INSERTED INTO LASER DISPLACEMENT SENSOR AND OBJECT

摘要

PURPOSE: An apparatus is provided to shift a reference distance of a laser displacement sensor and to expand a measurement range of the laser displacement sensor by inserting a transparent member into a laser beam path. CONSTITUTION: A laser displacement sensor(100) includes a laser beam source(11) and a laser beam receiving section(12). The laser beam source(11) generates laser beam. The laser beam receiving section(12) receives laser beam reflected from an object(13) to be measured. A plate-type transparent member(200) having a refractive index larger than that of air is inserted into the laser displacement sensor(100) and the object(13). The transparent member(200) is supported by a holder.