公开(公告)号：US20170242124A1

公开(公告)日：2017-08-24

申请号：US15433722

申请日：2017-02-15

Applicant: TOPCON CORPORATION

Inventor： Katsuyuki NAGAI ,  Takahiro MAEHARA ,  Jun ABE

IPC: G01S17/08

CPC classification number: G01S17/08 ,  G01S7/4915 ,  G01S17/36 ,  G01S17/42

Abstract: Decrease in a measurable distance that occurs when a distance measuring light is obliquely incident on an object is suppressed. A distance measuring device 100 includes an emitting unit 103, a detecting unit 104, a frequency-modulated component separating unit 105, a selecting unit 107, and a distance calculating unit 108. The emitting unit 103 emits distance measuring light to an object to be measured. The distance measuring light is modulated by multiple modulation frequencies. The detecting unit 104 receives and detects light of the distance measuring light that is reflected from the object. The separating unit 105 separates components of the received reflected light into multiple frequency-modulated components. The selecting unit 107 selects a frequency-modulated component that has a received-light intensity exceeding a threshold value from among the separated multiple modulation frequencies. The distance calculating unit 108 calculates a distance to the object based on the selected frequency-modulated component.