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Interferometric fiber optic sensors.

Lee BH, Kim YH, Park KS, Eom JB, Kim MJ, Rho BS, Choi HY - Sensors (Basel) (2012)

Bottom Line: Some of the simple to fabricate but exceedingly effective Fabry-Perot interferometers, implemented in both extrinsic and intrinsic structures, are discussed.Also, a wide variety of Mach-Zehnder and Michelson interferometric sensors based on photonic crystal fibers are introduced along with their remarkable sensing performances.Finally, the simultaneous multi-parameter sensing capability of a pair of long period fiber grating (LPG) is presented in two types of structures; one is the Mach-Zehnder interferometer formed in a double cladding fiber and the other is the highly sensitive Sagnac interferometer cascaded with an LPG pair.

View Article: PubMed Central - PubMed

Affiliation: School of Information and Communications, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, Korea. leebh@gist.ac.kr

ABSTRACT
Fiber optic interferometers to sense various physical parameters including temperature, strain, pressure, and refractive index have been widely investigated. They can be categorized into four types: Fabry-Perot, Mach-Zehnder, Michelson, and Sagnac. In this paper, each type of interferometric sensor is reviewed in terms of operating principles, fabrication methods, and application fields. Some specific examples of recently reported interferometeric sensor technologies are presented in detail to show their large potential in practical applications. Some of the simple to fabricate but exceedingly effective Fabry-Perot interferometers, implemented in both extrinsic and intrinsic structures, are discussed. Also, a wide variety of Mach-Zehnder and Michelson interferometric sensors based on photonic crystal fibers are introduced along with their remarkable sensing performances. Finally, the simultaneous multi-parameter sensing capability of a pair of long period fiber grating (LPG) is presented in two types of structures; one is the Mach-Zehnder interferometer formed in a double cladding fiber and the other is the highly sensitive Sagnac interferometer cascaded with an LPG pair.

No MeSH data available.


Related in: MedlinePlus

(a) Experimental setup of the Sagnac interferometric sensor combined with an LPG pair MZI sensor, and (b) the measured transmission spectrum [85]. It can measure temperature and strain simultaneously.
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f12-sensors-12-02467: (a) Experimental setup of the Sagnac interferometric sensor combined with an LPG pair MZI sensor, and (b) the measured transmission spectrum [85]. It can measure temperature and strain simultaneously.

Mentions: Another beneficial point of the SI-based sensors is the simultaneous sensing capability with the help of other fiber optic devices [80–85]. Figure 12(a) shows the experimental setup of hybrid Sagnac-MZI sensor based on a PMF and an LPG pair for measuring temperature and strain simultaneously [85]. The fiber loop was composed by cascading a piece of PMF and a pair of LPGs within a fiber loop. As illustrated in Figure 12(a), the sensing fiber was fixed at a computer-controlled stage for the strain measurement and also put into an oven for the temperature measurement. The measured transmission spectrum is presented in Figure 12(b) [85]. We can see two interference signals within the interesting wavelength range. The left big peak around 1500 nm is caused by the PMF SI and the other fine one around 1530 nm is formed by the LPG pair MZI. Figure 13(a) shows the temperature response of the hybrid Sagnac-MZI sensor. As increasing the temperature, both interference signals were shifted to the shorter wavelength direction; however, the sensitivity of the PMF was 4 times higher than that of the LPG pair. The strain response of the sensor is shown in Figure 13(b); the PMF was more sensitive to the strain compared to the LPG pair. From the different sensitivities of the PMF SI and the LPG pair MZI, temperature and strain could be measured simultaneously with the same fiber loop.


Interferometric fiber optic sensors.

Lee BH, Kim YH, Park KS, Eom JB, Kim MJ, Rho BS, Choi HY - Sensors (Basel) (2012)

(a) Experimental setup of the Sagnac interferometric sensor combined with an LPG pair MZI sensor, and (b) the measured transmission spectrum [85]. It can measure temperature and strain simultaneously.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376629&req=5

f12-sensors-12-02467: (a) Experimental setup of the Sagnac interferometric sensor combined with an LPG pair MZI sensor, and (b) the measured transmission spectrum [85]. It can measure temperature and strain simultaneously.
Mentions: Another beneficial point of the SI-based sensors is the simultaneous sensing capability with the help of other fiber optic devices [80–85]. Figure 12(a) shows the experimental setup of hybrid Sagnac-MZI sensor based on a PMF and an LPG pair for measuring temperature and strain simultaneously [85]. The fiber loop was composed by cascading a piece of PMF and a pair of LPGs within a fiber loop. As illustrated in Figure 12(a), the sensing fiber was fixed at a computer-controlled stage for the strain measurement and also put into an oven for the temperature measurement. The measured transmission spectrum is presented in Figure 12(b) [85]. We can see two interference signals within the interesting wavelength range. The left big peak around 1500 nm is caused by the PMF SI and the other fine one around 1530 nm is formed by the LPG pair MZI. Figure 13(a) shows the temperature response of the hybrid Sagnac-MZI sensor. As increasing the temperature, both interference signals were shifted to the shorter wavelength direction; however, the sensitivity of the PMF was 4 times higher than that of the LPG pair. The strain response of the sensor is shown in Figure 13(b); the PMF was more sensitive to the strain compared to the LPG pair. From the different sensitivities of the PMF SI and the LPG pair MZI, temperature and strain could be measured simultaneously with the same fiber loop.

Bottom Line: Some of the simple to fabricate but exceedingly effective Fabry-Perot interferometers, implemented in both extrinsic and intrinsic structures, are discussed.Also, a wide variety of Mach-Zehnder and Michelson interferometric sensors based on photonic crystal fibers are introduced along with their remarkable sensing performances.Finally, the simultaneous multi-parameter sensing capability of a pair of long period fiber grating (LPG) is presented in two types of structures; one is the Mach-Zehnder interferometer formed in a double cladding fiber and the other is the highly sensitive Sagnac interferometer cascaded with an LPG pair.

View Article: PubMed Central - PubMed

Affiliation: School of Information and Communications, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, Korea. leebh@gist.ac.kr

ABSTRACT
Fiber optic interferometers to sense various physical parameters including temperature, strain, pressure, and refractive index have been widely investigated. They can be categorized into four types: Fabry-Perot, Mach-Zehnder, Michelson, and Sagnac. In this paper, each type of interferometric sensor is reviewed in terms of operating principles, fabrication methods, and application fields. Some specific examples of recently reported interferometeric sensor technologies are presented in detail to show their large potential in practical applications. Some of the simple to fabricate but exceedingly effective Fabry-Perot interferometers, implemented in both extrinsic and intrinsic structures, are discussed. Also, a wide variety of Mach-Zehnder and Michelson interferometric sensors based on photonic crystal fibers are introduced along with their remarkable sensing performances. Finally, the simultaneous multi-parameter sensing capability of a pair of long period fiber grating (LPG) is presented in two types of structures; one is the Mach-Zehnder interferometer formed in a double cladding fiber and the other is the highly sensitive Sagnac interferometer cascaded with an LPG pair.

No MeSH data available.


Related in: MedlinePlus