Abstract
A high temperature (up to 950 °C) sensor was proposed and demonstrated based on a micro taper in-line fiber Mach–Zehnder interferometer (MZI) structure. The fiber MZI structure comprises a single mode fiber (SMF) with two micro tapers along its longitudinal direction. An annealing at 1000 °C was applied to the fiber sensor to stabilize the temperature measurement. The experimental results showed that the sensitivity was 0.114 nm/°C and 0.116 nm/°C for the heating and cooling cycles, respectively, and, after two days, the sensor still had a sensitivity of 0.11 nm/°C, showing a good stability of the sensor. A probe-type fiber MZI was designed by cutting the sandwiched SMF, which has good linear temperature responses of 0.113 nm/°C over a large temperature range from 89 to 950 °C. The probe-type fiber MZI temperature sensor was independent to the surrounding refractive index (RI) and immune to strain. The developed sensor has a wide application prospect in the fields of high temperature hot gas flow, as well as oil and gas field development.
Highlights
Optical fiber interferometer sensors have the advantages of small size, compactness, and high sensitivity, which is why they are widely used in petroleum, chemical industries, and physical and biomedicine sensing [1,2,3,4,5]
The structure is based on a single single mode fiber (SMF), In this paper, a novel in-line fiber Mach–Zehnder interferometer (MZI) sensor based on a micro taper structure was proposed and where two micro tapers are created with a short SMF sandwiched between the two micro tapers
SMFremoved; was removed;,ends bothofends of the optical fiberfixed wereon fixed on the splicer by two fiber clamps
Summary
Optical fiber interferometer sensors have the advantages of small size, compactness, and high sensitivity, which is why they are widely used in petroleum, chemical industries, and physical and biomedicine sensing [1,2,3,4,5]. The structure is based on a single SMF, In this paper, a novel in-line fiber MZI sensor based on a micro taper structure was proposed and where two micro tapers are created with a short SMF sandwiched between the two micro tapers The investigated in both theoretical and experimental studies. Since the micro taper can be created using a common commercial fusion splicer, the structure of the as arc-discharged time, power, and stepped length, resulting in different coupling coefficients from micro taper can be changed by controlling the arc-discharge parameters, such as arc-discharged the input SMF to the sandwiched SMF and, a flexible design of the sensor structure. Power, and stepped length, resulting in different coupling coefficients from the input SMF to the demonstrate the application of the micro taper design, a high-temperature measurement
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