Abstract
A reflective fiber-optic interferometer for ultra-high temperature measurement is proposed and experimentally demonstrated. The device consists of a short piece of polarization-maintaining photonic crystal fiber (PM-PCF) spliced with a lead-in single mode fiber (SMF) without any offset. The hollow holes within the PM-PCF are partly collapsed due to the directional arc-heating splicing and excite two linearly polarized (LP) modes over the downstream PM-PCF. These two LP-modes are reflected at the end face of PM-PCF and backward recoupled into the lead-in SMF through the collapsed region. A superimposed interference pattern is obtained as the result of interference of the polarized modes. The proposed interferometer is demonstrated for ultra-high temperature measurement up to 1100 °C with a sensitivity of 12.3 pm/°C over repeated measurements. Meanwhile, isochronally thermal annealing has been studied to address the effect of residual stress in the sensing probe and the feasibility of further improving temperature measurement range of the device.
Highlights
Photonic crystal fibers (PCFs) as the new generations of optical fibers have played an important role in many fields [1]–[4], due to their unique properties that cannot be realized in unstructured fibers
A fiber optic interferometer based on intermodal coupling of two linearly-polarized (LP) modes within polarization-maintaining photonic crystal fiber (PM-PCF) has been proposed for torsion measurement [12]
We propose a compact reflection-based fiber-optic interferometer for ultra-high temperature measurement with a simple fabrication that a short piece of PM-PCF is spliced with a lead-in single mode fiber (SMF)
Summary
Photonic crystal fibers (PCFs) as the new generations of optical fibers have played an important role in many fields [1]–[4], due to their unique properties that cannot be realized in unstructured fibers. Fiber (PMF) achieved in BPanda[, Bbow-tie[ or elliptical core fiber [6], the polarization-maintaining photonic crystal fibers (PM-PCFs) as one of index-guiding PCF group show some new advantages because of their higher birefringence, lower intrinsic temperature sensitivity [7], and high temperature resistance (compared with fiber grating-based devices especially). We propose a compact reflection-based fiber-optic interferometer for ultra-high temperature measurement with a simple fabrication that a short piece of PM-PCF is spliced with a lead-in SMF. The proposed PM-PCF sensor performs a linear temperature sensitivity of 12.3 pm=C over repeated temperature measurements, which is about 30 times higher than that of the previous PM-PCF-based devices [9], [11], [23], [24]. Compared with the previous reports, the fabrication of sensing device is simple and cost-effective, making it a good candidate for ultra-high temperature measurement
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