Related Experiment Video
Updated: Mar 25, 2026
04:41
Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures
Published on: September 2, 2019
7.9K
Spot event detection along a large-scale sensor based on ultra-weak fiber Bragg gratings using time-frequency
Applied Optics
|February 25, 2016
Summary
A novel fiber Bragg grating (FBG) sensor system enables accurate quasi-distributed sensing. This simple, robust device measures temperature, length, and position along a 5m fiber with high resolution.
Area of Science:
- Photonics
- Optical Sensing
- Fiber Optic Sensors
Background:
- Quasi-distributed fiber sensing offers advantages for monitoring applications.
- Existing methods can be complex and instrumentation-heavy.
Purpose of the Study:
- To propose a simple, robust scheme for interrogating a 5m photonics device.
- To demonstrate its application in quasi-distributed fiber sensing.
- To achieve accurate measurements of temperature, length, and position.
Main Methods:
- Utilizing an array of 500 weak fiber Bragg gratings (FBGs) serially written in a single fiber.
- Employing a measurement system combining optical time domain reflectometry and frequency-scanned interrogating pulses.
- Performing time-frequency analysis on the back-reflected signal.
Main Results:
- Demonstrated accurate measurement of temperature, length, and position events along the sensor.
- Achieved a spatial resolution of 9 mm using an 80 ps optical pulse.
- Attained a temperature resolution better than 0.42 K using a 500 ps incident pulse.
- System performance is controllable via interrogating pulse duration.
Conclusions:
- The proposed FBG sensor system is simple, robust, and polarization-insensitive.
- It alleviates instrumentation complexity for distributed sensing applications.
- The method offers tunable spatial and temperature resolution based on pulse duration.
