Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology

Abstract

We demonstrated a fiber in-line Mach-Zehnder interferometer (MZI) coated with platinum (Pt) for the simultaneous measurement of strain and temperature. The sensor was fabricated by splicing a section of multimode fiber (MMF) between two single mode fibers (SMFs) and the Pt coating was prepared by iron sputtering technology. Fine interference fringes of over 20 dB with a compact size of 20 mm were achieved. The experimental results of the two different resonant dips showed strain sensitivities of −2.06 pm/με and −2.21 pm/με, as well as temperature sensitivities of 55.2 pm/°C and 53.4 pm/°C, respectively. Furthermore, it was found that the Pt coating can improve the strain sensitivity significantly, resulting in an increase of about 54.5%. In addition, the sensor has advantages of easy fabrication, low cost, and high sensitivity, showing great potential for the dual-parameter sensing of strain and temperature.

Simultaneous Curvature and Temperature Sensing Based on a Novel Mach-Zehnder Interferometer

“…In order to analyze the mode changes and power distribution of the interference modes with an increase in the curvature, the transmission spectra in Fig. 7 are analyzed by Fourier transform [26] to get the spatial frequency spectra, and the frequency spectra of two curvatures (0 and 0.65 m −1 ) are shown in Fig. 8.…”

Theoretical study of the dispersion effects occurring at optical fiber connections

“…At the same time, published sources [5][6][7][8][9][10] do not provide information on the effect of the investigated power redistribution processes on form, and, consequently, duration of the optical signal.…”

“…Instead, a considerable attention is paid to improvement of OF connections in terms of reducing errors at the receiving side [8]. There are papers devoted to metrological aspects of study of attenuation occurring in the OF connection points [9,10]. These studies also do not take into consideration a phenomenon of signal form distortion caused by redistribution of signal power in an OF connection point.…”

“…These studies also do not take into consideration a phenomenon of signal form distortion caused by redistribution of signal power in an OF connection point. An extensive list of references devoted to the mentioned issues is given in [5][6][7][8][9][10]. However, these studies do not consider the effect of fiber connection points on the optical signal length and magnitude of introduced dispersion.…”

“…Real estimates of probabilities of energy transition are provided by various schemes of direct measurement [5,9,22]. For the problems considered in this paper, it is sufficient to be restricted to approximate estimates.…”