Optical fiber sensing has potential to overcome weak points of the traditional electric sensors. Many types of optical
fiber sensors have been proposed according to the modulation parameter of incident light. We proposed optical pulse
correlation sensing system which focuses the time drift values of the propagating optical pulses to monitor the
temperature- or strain-induced extension along the optical fiber transmission line. In this study, we stabilize the pulse
correlation signal instability due to the time drift fluctuation at the long transmission line to purify the response and
improve the accuracy of signals at the focused sensing regions.
We propose and demonstrate a regional selectable distributed optical sensing system based on monitoring the fiber optic
length fluctuation shifting by using optical pulse correlation measurement. The measureable regions easily upgrade using
by scanning of time position method and frequency sweep of pulse repetition method. These regional selected sensing
techniques experimentally operated within sub-micro-epsilon level strain of resolution in monitoring fiber environment
change.
A fiber optic wide region temperature sensing system based on optical pulse correlation measurement and SHG
differential detection technique is proposed and demonstrated. In order to establish the reliability of this fiber optic
temperature sensing system, a long-term wide region outside temperature monitoring experiment with a new
designed 20ps time-bias optical pulse correlation unit for wide measurement rang was carried out. The temperature
measured by means of a correlation sensor had the same variation as and higher sensitivity and quick measurement
response than the digital thermometer. The resolution of the correlation sensor is approximately ±0.01 oC . This fiber
optic temperature sensor can measure even in very tough environment and low and high temperature range. Not only
point temperature but also a field area average temperature can monitor by this system.
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