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.