公开(公告)号：US08351029B2

公开(公告)日：2013-01-08

申请号：US12745815

申请日：2008-12-03

申请人： Satoshi Nishikawa ,  Masakazu Takabayashi ,  Eiji Yagyu ,  Kiichi Yoshiara ,  Tateki Mitani ,  Yutarou Hamatani

发明人： Satoshi Nishikawa ,  Masakazu Takabayashi ,  Eiji Yagyu ,  Kiichi Yoshiara ,  Tateki Mitani ,  Yutarou Hamatani

IPC分类号： G01N21/41 ,  G01J1/00

CPC分类号： G01N21/431 ,  G01D5/35383 ,  G01N2021/433 ,  G02B6/02085

摘要： An objective of the present invention is to provide an optical fiber sensor which has a simple configuration to enable sensitively measuring a refractive index of a measurement medium in a wide range of refractive indexes. An optical fiber sensor according to the present invention includes; an optical fiber having a core in which a short-period gratings are formed and a cladding, the optical fiber being made so that transmission loss occurs due to cladding-propagation-mode leakage at its cladding portion where the short-period gratings are formed; a light source from which light having a wavelength range of the cladding propagation mode is emitted; and a light receiving unit for receiving transmission or reflection light having passed through the cladding at the position where the short-period gratings are formed. The optical fiber sensor detects, based on the total receiving light intensity that the light receiving unit receives, the refractive index of the measurement medium contacting the cladding, in which the optical fiber is multi-mode one, and the short-period gratings have plural kinds of periods.

摘要翻译： 本发明的目的是提供一种光纤传感器，其具有能够在宽范围的折射率下敏感地测量测量介质的折射率的简单配置。 根据本发明的光纤传感器包括： 具有形成短周期光栅的芯的光纤和包层，使得在形成有短周期光栅的包层部分处的包层传播模式泄漏的情况下，使光纤发生传输损耗; 发射具有包层传播模式的波长范围的光的光源; 以及光接收单元，用于在形成短周期光栅的位置处接收穿过包层的透射或反射光。 光纤传感器基于光接收单元接收的总接收光强度来检测与光纤为多模光纤的包层接触的测量介质的折射率，短周期光栅具有多个 种类的时期。

公开(公告)号：US20100296080A1

公开(公告)日：2010-11-25

申请号：US12745815

申请日：2008-12-03

申请人： Satoshi Nishikawa ,  Masakazu Takabayashi ,  Eiji Yagyu ,  Kiichi Yoshiara ,  Tateki Mitani ,  Yutarou Hamatani

发明人： Satoshi Nishikawa ,  Masakazu Takabayashi ,  Eiji Yagyu ,  Kiichi Yoshiara ,  Tateki Mitani ,  Yutarou Hamatani

IPC分类号： G01N21/41

CPC分类号： G01N21/431 ,  G01D5/35383 ,  G01N2021/433 ,  G02B6/02085

摘要： An objective of the present invention is to provide an optical fiber sensor which has a simple configuration to enable sensitively measuring a refractive index of a measurement medium in a wide range of refractive indexes. An optical fiber sensor according to the present invention includes; an optical fiber having a core in which a short-period gratings are formed and a cladding, the optical fiber being made so that transmission loss occurs due to cladding-propagation-mode leakage at its cladding portion where the short-period gratings are formed; a light source from which light having a wavelength range of the cladding propagation mode is emitted; and a light receiving unit for receiving transmission or reflection light having passed through the cladding at the position where the short-period gratings are formed. The optical fiber sensor detects, based on the total receiving light intensity that the light receiving unit receives, the refractive index of the measurement medium contacting the cladding, in which the optical fiber is multi-mode one, and the short-period gratings have plural kinds of periods.

摘要翻译： 本发明的目的是提供一种光纤传感器，其具有能够在宽范围的折射率下敏感地测量测量介质的折射率的简单配置。 根据本发明的光纤传感器包括： 具有形成短周期光栅的芯的光纤和包层，使得在形成有短周期光栅的包层部分由于包层传播模式泄漏而发生传输损耗的光纤; 发射具有包层传播模式的波长范围的光的光源; 以及光接收单元，用于在形成短周期光栅的位置处接收穿过包层的透射或反射光。 光纤传感器基于光接收单元接收的总接收光强度来检测与光纤为多模光纤的包层接触的测量介质的折射率，短周期光栅具有多个 种类的时期。

公开(公告)号：US08285086B2

公开(公告)日：2012-10-09

申请号：US12529865

申请日：2008-01-07

申请人： Satoshi Nishikawa ,  Masakazu Takabayashi ,  Kiichi Yoshiara ,  Eiji Yagyu ,  Tateki Mitani ,  Yutaro Hamatani

发明人： Satoshi Nishikawa ,  Masakazu Takabayashi ,  Kiichi Yoshiara ,  Eiji Yagyu ,  Tateki Mitani ,  Yutaro Hamatani

IPC分类号： G02B6/00 ,  G02B6/34

CPC分类号： G01N21/774

摘要： An optical fiber sensor measuring refractive index of a medium with high sensitivity in a wide range. The optical fiber sensor includes an optical fiber causing a transmission loss due to leakage in the clad propagation mode from a portion of a core and a clad where a Bragg grating is provided, a light source permitting light in a wavelength band in the clad propagation mode to enter the optical fiber, and a light-receiving section receiving the transmitted or reflected light transmitted through the core and the clad at the portion where the Bragg grating is provided. The refractive index of the medium to be measured in contact with the clad is measured according to total intensity of the light received by the light-receiving section. The Bragg grating is inclined at a predetermined angle of inclination to the vertical line vertical to the length direction of the optical fiber.

摘要翻译： 测量宽范围高灵敏度介质折射率的光纤传感器。 光纤传感器包括光纤，该光纤引起由包层传播模式中的泄漏引起的传输损耗，其中芯部和布拉格光栅的包层部分，允许在覆盖传播模式中波长带的光的光源 以及光接收部分，其接收在布拉格光栅提供的部分处透射穿过芯体和包层的透射或反射光。 根据由光接收部接收的光的总强度来测量与包层接触的待测量介质的折射率。 布拉格光栅以与光纤的长度方向垂直的垂直线倾斜预定的倾斜角度。

公开(公告)号：US20100080502A1

公开(公告)日：2010-04-01

申请号：US12529865

申请日：2008-01-07

申请人： Satoshi Nishikawa ,  Masakazu Takabayashi ,  Kiichi Yoshiara ,  Eiji Yagyu ,  Tateki Mitani ,  Yutaro Hamatani

发明人： Satoshi Nishikawa ,  Masakazu Takabayashi ,  Kiichi Yoshiara ,  Eiji Yagyu ,  Tateki Mitani ,  Yutaro Hamatani

IPC分类号： G02B6/00

CPC分类号： G01N21/774

摘要： An optical fiber sensor measuring refractive index of a medium with high sensitivity in a wide range. The optical fiber sensor includes an optical fiber causing a transmission loss due to leakage in the clad propagation mode from a portion of a core and a clad where a Bragg grating is provided, a light source permitting light in a wavelength band in the clad propagation mode to enter the optical fiber, and a light-receiving section receiving the transmitted or reflected light transmitted through the core and the clad at the portion where the Bragg grating is provided. The refractive index of the medium to be measured in contact with the clad is measured according to total intensity of the light received by the light-receiving section. The Bragg grating is inclined at a predetermined angle of inclination to the vertical line vertical to the length direction of the optical fiber.

摘要翻译： 测量宽范围高灵敏度介质折射率的光纤传感器。 光纤传感器包括光纤，该光纤引起由包层传播模式中的泄漏引起的传输损耗，其中芯部和布拉格光栅的包层部分，允许在覆盖传播模式中波长带的光的光源 以及光接收部分，其接收在布拉格光栅提供的部分处透射穿过芯体和包层的透射或反射光。 根据由光接收部接收的光的总强度来测量与包层接触的待测量介质的折射率。 布拉格光栅以与光纤的长度方向垂直的垂直线倾斜预定的倾斜角度。