Mitsubishi Electric Corporation

Takanori Yamauchi

Naoki Suzuki

Hiroki Goto

Kiyoshi Onohara

Tsuyoshi Yoshida

An optical distance measurer includes: a beam splitter splitting a laser beam and outputting as measurement light and reference light; a measurement light beam splitter splitting the measurement light and outputting as first measurement light and second measurement light; a reference light beam splitter splitting the reference light and outputting as first reference light and second reference light; a first optical system having a first Rayleigh length, the first optical system emitting the first measurement light to a target object; and a second optical system having a second Rayleigh length different from the first Rayleigh length, the second optical system emitting the second measurement light to the target object; a first receiver receiving the first reference light and first reflection light that is the first measurement light reflected by the target object and outputting a first receiving signal indicating the first reference light and the first reflection light; and a second receiver receiving the second reference light and second reflection light that is the second measurement light reflected by the target object and outputting a second receiving signal indicating the second reference light and the second reflection light.

Optical distance measurement device

A first optical path length from an emission surface of a first optical system to a reflection surface of a target object is calculated on the basis of first reflected light received by the first optical system and reference light generated by a splitter. A second optical path length from an emission surface of the second optical system to a reflection surface of a reflector is calculated on the basis of second reflected light reflected by the reflector and received by the second optical system and the reference light generated by the splitter A refractive index of a space is calculated on the basis of the second optical path length, and a distance from the emission surface of the first optical system to the reflection surface of the target object is calculated on the basis of the refractive index and the first optical path length.

Growing community of inventors

Tokyo, Japan

Takanori Yamauchi