Technique for referencing of fiber-optic intensity-modulated sensors by use of counterpropagating signals

2004 ◽  
Vol 29 (13) ◽  
pp. 1467 ◽  
Author(s):  
Celia Sánchez-Pérez ◽  
Augusto García-Valenzuela ◽  
G. Eduardo Sandoval-Romero ◽  
Joel Villatoro ◽  
Juan Hernández-Cordero
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Lian Wang ◽  
Juncheng Zhou ◽  
Yuhao Chen ◽  
Liu Xiao ◽  
Guojia Huang ◽  
...  

Abstract An intensity modulated fiber-optic carbon monoxide (CO) sensor by integrating in-situ solvothermal-growth Ag/Co-MOF sensing film is fabricated and evaluated. The Michelson interference sensing structure is composed of single-mode fiber (SMF), enlarged taper, thin-core fiber (TCF), and Ag film as the reflector. Ag/Co-MOF was coated on the cladding of the TCF as the sensing material, and the enlarged taper is located between TCF and SMF as the coupler. The structure, morphology, compositions and thermal stability of the Ag/Co-MOF sensing film were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), etc. The sensitivity of the sensor is 0.04515 dB/ppm, and the fitting parameter of the CO concentration is 0.99876. In addition, the sensor has the advantages of good selectivity, good signal and temperature stability, and it has potential application in trace CO detection.


2021 ◽  
Author(s):  
Putha Kishore ◽  
Dantala Dinakar ◽  
Manchineellu Padmavathi

The sensors presented in this chapter are fiber optic intensity modulated vibrations sensors which are non-contact (extrinsic sensor) to the vibrating object. Three sensors presented make use of non-contact vibration measurement method with plastic fiber using distinct designs, improvement of the sensor response and advantages of one sensor over the other for diverse applications. First discussed about dual plastic optical fiber vibration sensor design and its response. Secondly, discussed about 1x2 fused coupler plastic optical fiber vibration sensor design with advantages over the first one. Finally, discussed about the 2x2 fused coupler plastic optical fiber vibration sensor design along with advantages than other two methods. At the end reported the final results with comparison.


2013 ◽  
Vol 21 (20) ◽  
pp. 23433 ◽  
Author(s):  
Yan Cui ◽  
Yitang Dai ◽  
Feifei Yin ◽  
Jian Dai ◽  
Kun Xu ◽  
...  

2003 ◽  
Vol 42 (25) ◽  
pp. 5040 ◽  
Author(s):  
Silvia Abad ◽  
Francisco M. Araújo ◽  
Luis Alberto Ferreira ◽  
José Luís Santos ◽  
Manuel López-Amo

2013 ◽  
Vol 312 ◽  
pp. 766-770
Author(s):  
Xiao Long Li ◽  
Jian Gan Wang ◽  
Ya Ming Wu

Introducing a new intensity modulated optic microphone theory model, it can be used in infrasound sensor field. Single-mode optical fiber to transmit and receive light and optical lens to collimate is used to realize light intensity modulation, the system also contains MEMS membrane to be compatible with vibration displacement. Through the analysis of membrane size and the change of pressure, the related parameters about the sensitivity of fiber optic displacement sensor could be acquired. Simulation results show that the proper choice of parameters can make the sensitivity of sensor improve in orders of magnitude than traditional light intensity modulated methods.


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