Title:
DISTANCE MEASURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/188302
Kind Code:
A1
Abstract:
This distance measuring device comprises: an emission unit for emitting laser light, the optical intensity of which has been modulated on the basis of a first frequency signal having a first frequency and a second frequency signal having a second frequency higher than the first frequency; a light-receiving unit for receiving the laser light reflected by an object, and converting the optical intensity of the received laser light into an electrical signal; a first phase difference detection unit for detecting the phase difference between the first frequency signal and a signal component having the first frequency and generated from the electrical signal; a second phase difference detection unit for detecting the phase difference between the second frequency signal and a signal component having the second frequency and generated from the electrical signal; and a distance calculation unit for calculating the distance to the object on the basis of the phase difference detected by the first phase difference detection unit and the phase difference detected by the second phase difference detection unit. The laser light has an optical intensity that has been modulated with a composite signal obtained by displacing the phase of a sinusoidal signal having the second frequency on the basis of a sinusoidal signal having the first frequency.
Inventors:
OKUDA YOSHIYUKI (JP)
Application Number:
PCT/JP2019/010335
Publication Date:
October 03, 2019
Filing Date:
March 13, 2019
Export Citation:
Assignee:
PIONEER CORP (JP)
International Classes:
G01S17/36
Foreign References:
| JPH11118928A | 1999-04-30 | |||
| JPH0980153A | 1997-03-28 | |||
| JP2011522216A | 2011-07-28 | |||
| US5082364A | 1992-01-21 |
Attorney, Agent or Firm:
LEXT, P.C. (JP)
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