A new vehicle axle detector for roadways based on fiber optic Mach-Zehnder interferometer

2005 ◽  
Author(s):  
Ying Wang ◽  
Qifeng Wu ◽  
Mudi Xiong ◽  
Rongxi He
Keyword(s):  
Fiber Optic ◽  
Zehnder Interferometer ◽  
Mach Zehnder Interferometer

scholarly journals Optical Fiber Based Mach-Zehnder Interferometer for APES Detection

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5870
Author(s):  
Huitong Deng ◽  
Xiaoman Chen ◽  
Zhenlin Huang ◽  
Shiqi Kang ◽  
Weijia Zhang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
External Environment ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Mach Zehnder Interferometer

A 3-aminopropyl-triethoxysilane (APES) fiber-optic sensor based on a Mach–Zehnder interferometer (MZI) was demonstrated. The MZI was constructed with a core-offset fusion single mode fiber (SMF) structure with a length of 3.0 cm. As APES gradually attaches to the MZI, the external environment of the MZI changes, which in turn causes change in the MZI’s interference. That is the reason why we can obtain the relationships between the APES amount and resonance dip wavelength by measuring the transmission variations of the resonant dip wavelength of the MZI. The optimized amount of 1% APES for 3.0 cm MZI biosensors was 3 mL, whereas the optimized amount of 2% APES was 1.5 mL.

A Fiber Optic Micro-Curvature Sensor Based on an In-line Mach-Zehnder Interferometer and Erbium-Doped Fiber

2021 ◽  
Author(s):  
V. H. R. Cardoso ◽  
M. L. C. Amaral ◽  
M. T. M. R. Giraldi ◽  
C. S. Fernandes ◽  
J. C. W. A. Costa
Keyword(s):  
Fiber Optic ◽  
Zehnder Interferometer ◽  
Erbium Doped ◽  
Mach Zehnder Interferometer ◽  
Curvature Sensor

scholarly journals Optical Coupling Structures of Fiber-Optic Mach-Zehnder Interferometers Using CO2Laser Irradiation

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Chien-Hsing Chen ◽  
Chih-Yu Hsu ◽  
Pei-Hsing Huang ◽  
Jian-Neng Wang ◽  
Wei-Te Wu
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Zehnder Interferometer ◽  
Measurement Tool ◽  
Wavelength Shift ◽  
Refractive Index Sensor ◽  
Interference Signal ◽  
Optical Coupling ◽  
Interference Signals ◽  
Mach Zehnder Interferometer

The Mach-Zehnder interferometer (MZI) can be used to test changes in the refractive index of sucrose solutions at different concentrations. However, the popularity of this measurement tool is limited by its substantial size and portability. Therefore, the MZI was integrated with a small fiber-optic waveguide component to develop an interferometer with fiber-optic characteristics, specifically a fiber-optic Mach-Zehnder interferometer (FO-MZI). Optical fiber must be processed to fabricate two optical coupling structures. The two optical coupling structures are a duplicate of the beam splitter, an optical component of the interferometer. Therefore, when the sensor length and the two optical coupling structures vary, the time or path for optical transmission in the sensor changes, thereby influencing the back-end interference signals. The researchers successfully developed an asymmetrical FO-MZI with sensing abilities. The spacing value between the troughs of the sensor length and interference signal exhibited an inverse relationship. In addition, image analysis was employed to examine the size-matching relationship between various sensor lengths and the coupling and decoupling structure. Furthermore, the spectral wavelength shift results measured using a refractive index sensor indicate that FO-MZIs with a sensor length of 38 mm exhibited excellent sensitivity, measuring 59.7 nm/RIU.

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