Title:
DISTANCE MEASURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/181695
Kind Code:
A1
Abstract:
The present invention includes: an emission unit which emits laser light obtained by modulating light intensity on the basis of a first frequency signal of a first frequency and a second frequency signal of a second frequency higher than the first frequency; a light reception unit which receives laser light that has been reflected at a target object and converts the light intensity into an electrical signal; a first phase difference detection unit which detects a phase difference between a signal component of the first frequency generated from the electrical signal and the first frequency signal; a second phase difference detection unit which detects a phase difference between a signal component of the second frequency generated from the electrical signal and the second frequency signal; and a distance calculation unit which calculates the distance to the target object on the basis of the phase differences for the first frequency and the second frequency. The light intensity of the laser light is modulated by a composite wave signal obtained by adding a first sine wave of a third frequency, which is the difference between the first frequency and the second frequency, and a second sine wave of a fourth frequency, which is the sum of the first frequency and the second frequency.
Inventors:
OKUDA YOSHIYUKI (JP)
Application Number:
PCT/JP2019/010333
Publication Date:
September 26, 2019
Filing Date:
March 13, 2019
Export Citation:
Assignee:
PIONEER CORP (JP)
International Classes:
G01S17/36
Foreign References:
| JPH04131787A | 1992-05-06 | |||
| JP2011007551A | 2011-01-13 | |||
| JP2013535675A | 2013-09-12 | |||
| US5082364A | 1992-01-21 |
Attorney, Agent or Firm:
LEXT, P.C. (JP)
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