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公开(公告)号：WO9617225A2
公开(公告)日：1996-06-06
申请号：PCT/US9515370
申请日：1995-11-22
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUNPHY JAMES R , RYAN JAMES J
CPC classification number: G01M11/083 , G01D5/35383 , G01N17/00 , G01N21/45
Abstract: A highly sensitive optical fiber cavity coating removal detector employs an optical fiber (18) having a pair of Bragg gratings (20, 30) embedded therein and separated by a section of fiber making up an optical cavity (26). The optical path length of the cavity (26) is sized with the central reflection wavelength of the fiber gratings (20, 30) so as to create an optical resonator. The cavity (26) is coated with a material (40) which corrodes or is otherwise removable, such as aluminum. The coating (40) exerts forces (46) radially inward on the cavity (26) so as to cause the refractive index of the cavity and thus its optical path length to change, thereby causing the resonator to come out of resonance. The forces (46) on the cavity (26) are reduced when the coating (40) corrodes, thereby causing the resonator to re-enter resonance. Additionally, the coating causes optical losses to exist due to non-uniform variations in refractive index caused by non-uniform forces from coating irregularities.
Abstract translation: 高灵敏度的光纤腔涂层去除检测器采用光纤（18），其具有嵌入其中的一对布拉格光栅（20,30），并由构成光腔（26）的纤维的一部分分隔开。 通过光纤光栅（20,30）的中心反射波长来确定空腔（26）的光路长度，以便产生光学谐振器。 空腔（26）涂覆有腐蚀或可移除的材料（40），例如铝。 涂层（40）在空腔（26）上径向向内施加力（46），以引起空腔的折射率并因此改变其光路长度，从而使谐振器脱离共振。 当涂层（40）腐蚀时，空腔（26）上的力（46）减小，从而使谐振器重新进入共振。 此外，由于涂层不均匀的不均匀的力引起的折射率的不均匀的变化，涂层会导致光学损失。
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公开(公告)号：GR3029748T3
公开(公告)日：1999-06-30
申请号：GR990400833
申请日：1999-03-19
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUNPHY JAMES R , RYAN JAMES J
IPC: G01B11/16 , B29C35/02 , B29C70/54 , C03C25/10 , G01D5/353 , G01M11/08 , G01N11/00 , G01N33/44 , G01D5/26 , G01L1/00 , C03C25/00 , G02B6/245
Abstract: An optical corrosion sensor employs an optical fiber Bragg grating 20 embedded within an optical fiber 18 . The grating 20 has a coating 40 made of a material, such as aluminum, which corrodes or can otherwise be removed. The coating 40 exerts forces 46 radially inward around and along the grating 20 so as to cause the wavelength bandwidth of the grating reflectivity profile to become broader and to be shifted relative to its uncoated condition. Also, the forces on the grating 20 are reduced when the coating corrodes, thereby causing the wavelength bandwidth and shift of the reflectivity profile of the grating to narrow and to return to its uncoated condition.
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公开(公告)号：DK0795118T3
公开(公告)日：2002-02-11
申请号：DK95944597
申请日：1995-11-22
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUNPHY JAMES R , RYAN JAMES J
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公开(公告)号：DK0795117T3
公开(公告)日：1999-09-13
申请号：DK95942454
申请日：1995-11-21
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUNPHY JAMES R , RYAN JAMES J
IPC: G01B11/16 , B29C35/02 , B29C70/54 , C03C25/10 , G01D5/353 , G01M11/08 , G01N11/00 , G01N33/44 , G01D5/26 , C03C25/00 , G01L1/00 , G02B6/245
Abstract: An optical corrosion sensor employs an optical fiber Bragg grating 20 embedded within an optical fiber 18 . The grating 20 has a coating 40 made of a material, such as aluminum, which corrodes or can otherwise be removed. The coating 40 exerts forces 46 radially inward around and along the grating 20 so as to cause the wavelength bandwidth of the grating reflectivity profile to become broader and to be shifted relative to its uncoated condition. Also, the forces on the grating 20 are reduced when the coating corrodes, thereby causing the wavelength bandwidth and shift of the reflectivity profile of the grating to narrow and to return to its uncoated condition.
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