Title:
RANGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/245778
Kind Code:
A1
Abstract:
A ranging device (1) has a subject interferometer (103) that detects interference light between light from a wavelength scanning light source (100) and reflected light that has been reflected by a measurement subject (104), and a reference interferometer (102) that detects interference light between light outputted from a light source and light having a prescribed optical path length difference. The ranging device (1) uses a single-frequency-equivalent distance calculated using the scanning phase width or the scanning frequency width of a relative phase calculated from a phase change curve of an interference signal from the reference interferometer (102), also uses a resampling timing calculated using the phase change curve and a prescribed phase gap, and moreover uses the peak frequency of a signal in which the interference signal from the subject interferometer (103) is sampled, to calculate the distance to the measurement subject (104) in the subject interferometer (103). This makes it possible to realize a ranging device in which measurement precision is improved and fluctuations in ranging results with respect to fluctuations in scanning frequency width are suppressed.
Inventors:
UENO MASAHIRO (JP)
TANAKA YURINA (JP)
AKAGE YUICHI (JP)
SAKAMOTO TAKASHI (JP)
KAWAMURA SOHAN (JP)
OKA SOICHI (JP)
TANAKA YURINA (JP)
AKAGE YUICHI (JP)
SAKAMOTO TAKASHI (JP)
KAWAMURA SOHAN (JP)
OKA SOICHI (JP)
Application Number:
PCT/JP2020/021734
Publication Date:
December 09, 2021
Filing Date:
June 02, 2020
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G01S17/34
Domestic Patent References:
| WO2017168628A1 | 2017-10-05 |
Foreign References:
| JP2016024086A | 2016-02-08 | |||
| JP2016209182A | 2016-12-15 | |||
| CN110646805A | 2020-01-03 |
Other References:
GORA, M . ET AL.: "Ultra high-speed swept source OCT imaging of the anterior segment of human eye at 200 kHz with adjustable imaging range", OPTICS EXPRESS, vol. 17, no. 17, 6 August 2009 (2009-08-06), pages 14880 - 14894, XP055056202, ISSN: 1094-4087, DOI: 10.1364/OE.17.014880
Attorney, Agent or Firm:
YAMAKAWA, Shigeki et al. (JP)
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