DETECTION METHOD AND DETECTION SYSTEM

Title:

DETECTION METHOD AND DETECTION SYSTEM

Document Type and Number:

WIPO Patent Application WO/2016/171218

Kind Code:

A1

Abstract:

Provided are a detection method and a detection system which utilize circularly polarized light and which provide high sensitivity and limited erroneous detection when a transparent article is the object to be detected. Provided is a detection method in which an object is detected through detection of light which originates from emitted light and which has passed through the object, the emitted light is circularly polarized light, the light detected is circularly polarized light, and the light originating from the emitted light enters the object at an angle of greater than 20°to not greater than 70° with respect to the normal of the object. Also provided is a transmission-type detection system including an emitting unit, an object moving unit, and a detection unit in this order, in which the sense of circularly polarized light emitted by the emitting unit is opposite to the sense of circularly polarized light detected by the detection unit, and an angle made at an intersection where the object moving unit and the light path of light which originates from light emitted from the emitting unit and which enters the detection unit intersect is greater than 20° to not greater than 70°with respect to the normal of the object moving unit. Also provided is a reflective detection system further including a specular reflection member, in which the sense of the circularly polarized light emitted by the emitting unit is the same as the sense of the circularly polarized light detected by the detection unit.

Inventors:

MAJIMA WATARU (JP)
OKI KAZUHIRO (JP)
ICHIHASHI MITSUYOSHI (JP)

Application Number:

PCT/JP2016/062652

Publication Date:

October 27, 2016

Filing Date:

April 21, 2016

Export Citation:

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Assignee:

FUJIFILM CORP (JP)

International Classes:

G01N21/23; G01N21/88; G01V8/10; G02B5/30

Domestic Patent References:

WO2014181799A1

2014-11-13

Foreign References:

JPS5026234B1	1975-08-29
JP2008175940A	2008-07-31
JP2013036888A	2013-02-21
JP2011149935A	2011-08-04

Other References: