Electro-optical distance meter

Abstract

[Problem] To provide an electro-optical distance meter in which the measurement time is reduced, and a temperature phase drift of electrical components is reduced. [Solution Means] An electro-optical distance meter includes a first light-emitting element () which emits light modulated with a plurality of main modulation frequencies (Fand F), a second light-emitting element () which emits light modulated with a plurality of adjacent modulation frequencies (F−Δfand F−Δf) close to the main modulation frequencies, respectively, first and second light receiving elements (and) which receive light emitted from both light-emitting elements, a first frequency converter group () connected to the first light receiving element, and a second frequency converter group () connected to the second light receiving element. The light emitted from the first light-emitting element is split into two parts, one of these is made incident onto the first light receiving element through a distance measuring optical path () for traveling to and from a target reflection object (), and the other is made incident onto the second light receiving element through a first reference optical path (), and the light emitted from the second light-emitting element is split into two parts, one of these is made incident onto the second light receiving element through a second reference optical path (), and the other is made incident onto the first light receiving element through a third reference optical path ().