An in-line Mach-Zehnder interferometer(MZI) sensor was proposed and experimentally demonstrated for simultaneously measuring transverse pressure and temperature. The MZI is fabricated by simply splicing the two ends of a segment multicore fiber (MCF) with two short sections of multimode fibers (MMFs) using a commercial fusion splicer. The transverse pressure and temperature characteristics of the sensor have been investigated in experiment. The results show that the transmission spectra shift when the external transverse pressure and temperature variation, and different spectral responses of the resonant dips are observed, which indicates that the sensor can realize simultaneous transverse pressure and temperature measurement by monitoring the wavelength changes of two resonant dips. The obtained sensitivities can reach up to 112pm/N and 43pmm/°C, respectively.The proposed sensor has the potential application in the fields where both temperature and transverse pressure measurments are required
A Mach-Zehnder interferometer based on seven-core fiber (SCF) and muti-mode fiber (MMF) is proposed and experimentally demonstrated. The interferometer is fabricated by splicing a segment of SCF spliced with two MMFs. The SCF length and MMF length are 5cm and 1cm, respectively. When the broadband light is injected into the interferometer through a lead-in single mode fiber, a pronounced interference pattern appears in the transmission spectrum. By monitoring the wavelength and power shifts of interference dips, simultaneous measurement of strain and torsion can be achieved. The experimental results show that the wavelengths at interference dip have a blue shift with the increases of strain, but the wavelength does not respond to the torsion. The power sensitivities of the interference dip to the strain and torsion are sensitivities are 0.001dB /° and 0.16dB/°, respectively. The simultaneous measurement of strain and torsion is demonstrated based on the sensitive matrix. The proposed MZI exhibits the advantages of easy fabrication, low cost, and simultaneous measurement of strain and torsion, which will make a significant contribution to torsion measurement.
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