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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range.

Yinghong Xue¹, Yueping Niu¹, Shangqing Gong¹

¹School of Physics, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, China.

Sensors (Basel, Switzerland)

|August 28, 2021

Summary

This summary is machine-generated.

This study introduces an external modulation Optical Coherent Domain Reflectometry (OCDR) system. The new method significantly extends measurement range and speed for optical fiber sensing.

Keywords:

Rayleigh backscattering coherent detection optical fiber sensor reflectometry

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Area of Science:

Optoelectronics
Fiber Optic Sensing
Metrology

Background:

Optical Coherent Domain Reflectometry (OCDR) offers high spatial resolution.
Traditional OCDR systems suffer from limited measurement ranges.
Receiver bandwidth typically limits spatial resolution in OCDR.

Purpose of the Study:

To propose and demonstrate an external modulation OCDR system.
To overcome the range limitations of conventional OCDR.
To enhance the measurement speed and spatial resolution of OCDR.

Main Methods:

Utilizing a pair of linear frequency-modulated pulses as probe and reference.
Employing external modulation for pulse generation.
Simultaneously diagnosing a fiber section with each pulse pair.

Main Results:

Achieved a measurement range of up to 50 km.
Obtained a spatial resolution of 1.4 m.
Completed measurements in less than 30 seconds.

Conclusions:

The external modulation OCDR system effectively extends measurement range and boosts speed.
This technology enables simultaneous fiber section diagnosis, improving efficiency.
The proposed system offers a significant advancement in optical fiber sensing capabilities.