IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0057446
(2008-03-28)
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등록번호 |
US-7489835
(2009-02-10)
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발명자
/ 주소 |
- Xia,Hua
- Goldmeer,Jeffrey Scott
- McCarthy,Kevin Thomas
- Kumar,Aditya
- Annigeri,Ravindra
- Yilmaz,Ertan
- Taware,Avinash Vinayak
- Zhao,Yu
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
25 인용 특허 :
4 |
초록
▼
A fiber gas sensor includes a fiber core with first and second refractive index periodic modulated grating structures having different amplitude modulation profiles positioned about the fiber core. A fiber cladding is positioned about the first and second refractive index periodic modulated grating
A fiber gas sensor includes a fiber core with first and second refractive index periodic modulated grating structures having different amplitude modulation profiles positioned about the fiber core. A fiber cladding is positioned about the first and second refractive index periodic modulated grating structures. A sensing layer is positioned about the fiber cladding of one of the refractive index periodic modulated grating structures. The sensing layer includes a sensing material made of a Pd-based alloy, such as nano-PdOx, nano-Pd(x)Au(y)Ni(1-x-y) or nano-Pd/Au/WOx. The fiber gas sensor provides a measurement of localized, temperature-corrected gas concentration and composition from a combustion environment. A reflection-based or a transmission-based sensing system with an array of one or more fiber gas sensors is also described.
대표청구항
▼
What is claimed is: 1. A fiber gas sensor, comprising: a fiber core having a longitudinal axis; a first refractive index periodic modulated grating structure having a first amplitude modulation profile positioned about the fiber core for sensing a localized gas concentration; a second refractive in
What is claimed is: 1. A fiber gas sensor, comprising: a fiber core having a longitudinal axis; a first refractive index periodic modulated grating structure having a first amplitude modulation profile positioned about the fiber core for sensing a localized gas concentration; a second refractive index periodic modulated grating structure having a second amplitude modulation profile positioned about the fiber core at a distance along the longitudinal axis with respect to the first refractive index periodic modulated grating structure for sensing a localized temperature; a fiber cladding positioned about the first and second refractive index periodic modulated grating structures; and a sensing layer positioned about the fiber cladding of the first refractive index periodic modulated grating structure, the sensing layer including a sensing material made of a Pd-based alloy, wherein the gas sensor is capable of providing a temperature-corrected determination of the localized gas concentration. 2. A gas sensor according to claim 1, wherein the first refractive index periodic modulated grating structure comprises one of a long-period fiber grating structure and a short-period fiber grating structure. 3. A gas sensor according to claim 1, wherein the amplitude modulation profile of one of the first and second refractive index periodic modulated grating structures has a modulation along the longitudinal axis with a pitch size of about 100 microns to about 600 microns. 4. A gas sensor according to claim 1, wherein the second refractive index periodic modulated grating structure comprises a short-period fiber grating structure. 5. A gas sensor according to claim 4, wherein the short-period fiber grating structure comprises a fiber Bragg grating (FBG) structure. 6. A gas sensor according to claim 1, further comprising an adhesive layer positioned between the fiber cladding and the sensing layer. 7. A gas sensor according to claim 1, wherein one of the first and second refractive index periodic modulated grating structures has one of a uniform profile, a blazed profile, an apodized profile, and a blazed and apodized profile. 8. A gas sensor according to claim 1, wherein the Pd-based alloy is made of a group consisting of nano-PdOx, nano-Pd(x)Au(y)Ni(1-x-y) and nano-Pd/Au/WOx. 9. A gas sensor according to claim 1, wherein the gas sensor is integrated into a fuel delivery control system of a gas turbine. 10. A fiber gas sensor, comprising: a fiber core having a longitudinal axis; a first short-period fiber grating structure having a first amplitude modulation profile positioned about the fiber core for sensing a localized gas concentration; a second short-period fiber grating structure having a second amplitude modulation profile positioned about the fiber core at a distance along the longitudinal axis with respect to the first short-period fiber grating structure for sensing a localized temperature; a fiber cladding positioned about the first short-period and second short-period fiber grating structures; and a sensing layer positioned about the fiber cladding of the first short-period fiber grating structure, the sensing layer including a sensing material made of a Pd-based alloy, wherein the gas sensor is capable of providing a temperature-corrected determination of the localized gas concentration. 11. A gas sensor according to claim 10, wherein the amplitude modulation profile of the first short-period fiber grating structure has a modulation along the longitudinal axis with a pitch size of about 0.5 microns. 12. A gas sensor according to claim 10, wherein the second short-period fiber grating structure comprises a fiber Bragg grating (FBG) structure. 13. A gas sensor according to claim 10, further comprising an adhesive layer positioned between the fiber cladding and the sensing layer. 14. A gas sensor according to claim 10, wherein one of the first short-period fiber grating structure and the second short-period fiber grating structure has one of a uniform profile, a blazed profile, an apodized profile, and a blazed and apodized profile. 15. A gas sensor according to claim 10, wherein the Pd-based alloy is made of a group consisting of nano-PdOx, nano-Pd(x)Au(y)Ni(1-x-y) and nano-Pd/Au/WOx. 16. A sensing system, comprising: at least one fiber gas sensor as recited in claim 1; a FC/APC connector operably coupled to each fiber gas sensor; and one of an optical splitter/combiner and an optical switch operably coupled to the FC/APC connector. 17. A sensing system according to claim 16, wherein the optical splitter/combiner is a 1��2, 1��3, 1��4, and 1��8 type. 18. A sensing system according to claim 16, wherein the optical switch is a 1��16 type. 19. A sensing system according to claim 16, wherein the sensing system comprises one of a reflection-based sensing system and a transmission-based sensing system. 20. A sensing system according to claim 16, wherein the sensing system is operated in one of a constant temperature condition for single composition detection or at a temperature modulated condition for multi-composition detection.
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