Patent ID: 6172742
Filing Date: 2001-01-09
Classification: G01C

Abstract:
A reference beam detecting apparatus for detecting a rotated reference laser beam emitted from a laser unit to determine the height of construction comprising:a first light receiving section and a second light receiving section for receiving the laser beam and located to leave a space therebetween in a rotating direction of the laser beam;a distance computing circuit for determining by computation the distance between the apparatus and the laser unit on the basis of the output signals of the first and second light receiving sections;an inclination storing circuit to store an inclination of a construction work as input;a height computing circuit for determining by computation the height to be used for the construction work on the basis of the output from the distance computing circuit and the value stored in the inclination store circuit; anda data display section for displaying the height to be used for the construction work on the basis of the output of the height computing circuit.