Optical measurement probe and optical measurement device provided with the same

Patent metadata

Field	Value
Publication number	US-2016349107-A1
Application number	US-201415114528-A
Country	US
Kind code	A1
Filing date	Feb 21, 2014
Priority date	Feb 21, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

Light from a direction (D) different from a predetermined direction is reflected by a tapered surface ( 21 ) so as to enter an optical fiber ( 4 ) for guiding light entering along the predetermined direction to an appliance. Light from the desired direction (D) may thereby be reflected by the tapered surface ( 21 ) according to the angle of the tapered surface ( 21 ) and may be made to enter the optical fiber ( 4 ). Accordingly, even in a case where the installation position of an optical measurement probe ( 1 ) is limited, if the angle of the tapered surface ( 21 ) is appropriately set, light from the desired direction (D) may be made to enter the optical fiber ( 4 ).

First claim

1 . An optical measurement probe for guiding light that is generated at a time of combustion to an appliance, the optical measurement probe comprising:
a light guide for guiding light entering along a predetermined direction to an appliance; and a reflection surface for reflecting light from a direction different from the predetermined direction, and for causing the light to enter the light guide along the predetermined direction.

2 . The optical measurement probe according to claim 1 , further comprising a reflection coating that is formed on the reflection surface.

3 . The optical measurement probe according to claim 2 , wherein the reflection coating is a dielectric multilayer.

4 . The optical measurement probe according to claim 2 , wherein the reflection coating is a metal film.

5 . The optical measurement probe according to claim 1 , further comprising an optical window, having the reflection surface, for causing light entering from a side surface to be reflected by the reflection surface so as to enter the light guide.

6 . The optical measurement probe according to claim 5 , wherein an incident surface that is a curved surface is formed at a part, of the side surface of the optical window, where light is to enter.

7 . The optical measurement probe according to claim 5 , further comprising a main body for holding the light guide and the optical window,
wherein the optical window is attached at an end section of the main body with the reflection surface protruding outward.

8 . An optical measurement device comprising:
an optical measurement probe according to claim 1 ; and a detector for detecting light guided by the optical measurement probe.

9 . An optical measurement device, wherein an optical measurement probe according to claim 1 is attached to a cylinder head of an internal combustion engine in a manner facing an inside of a combustion chamber that is a measurement target.

10 . The optical measurement device according to claim 9 ,
wherein the cylinder head includes a valve train driving member accommodation chamber for accommodating a valve train driving member, and wherein the optical measurement probe is provided on an opposite side from the valve train driving member accommodation chamber of the cylinder head.

Assignees

• Shimadzu Corp
• Honda Motor Co Ltd

Inventors

• Hiraoka Ryoji
• Iwai Nobuyuki
• Nagai Tetsuya
• Furukawa Yasuyuki
• Azumagakito Isao
• Kowada Mitsuru
• Okada Satoru

Classifications

• G01J3/0218

  using optical fibers · CPC title

• G01M15/02

  Details or accessories of testing apparatus · CPC title

• G01J3/0289

  Field-of-view determination; Aiming or pointing of a spectrometer; Adjusting alignment; Encoding angular position; Size of measurement area; Position tracking · CPC title

• G01J1/0425 Primary

  using optical fibers · CPC title

• G01J3/021 Primary

  using plane or convex mirrors, parallel phase plates, or particular reflectors · CPC title