A Perpendicular Direction Gauge Using a Lenticular Lens*

There are level gauges that measure the level with respect to the direction of gravity, but there are no compact devices like level gauges that measure the perpendicular direction to a line or a plane. The author has developed a lenticular angle gauge (LEAG) to visualize the relative orientation using a lenticular lens, and a “perpendicular gauge” to identify the perpendicular direction with respect to a line or plane using a LEAG. This paper describes the principle and structure of the perpendicular gauge and the results of a performance test using a prototype. The author will also discuss the various uses and future prospects for the perpendicular gauge.