Research on Large Range OFDR Distributed Temperature Sensing Technology Based on Frequency Sampling and Moving Reference Spectral Method

被引：1

作者：

Li Yitong ^{[1
]}

Zhang Liyun ^{[1
]}

Li Sibo ^{[1
]}

Shang Chuanyin ^{[1
]}

Wang Xingfei ^{[1
]}

Peng Wenxiu ^{[1
]}

Li Peng ^{[1
]}

机构：

[1] Tianjin Univ Technol, Engn Res Ctr Optoelect Devices & Commun, Tianjin Key Lab Thin Film Elect & Commun Devices, Minist Educ,Sch Integrated Circuit Sci & Engn, Tianjin 300384, Peoples R China

来源：

AOPC 2023:OPTIC FIBER GYRO | 2023年 / 12968卷

基金：

中国国家自然科学基金;

关键词：

OFDR; Frequency sampling; Reference Rayleigh scattering spectrum; Large range distributed temperature sensing; SYSTEM; FIBER;

D O I：

10.1117/12.3007557

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The Optical Frequency Domain Reflectometry (OFDR) is widely used in fields such as aviation temperature detection and integrated circuit processing and manufacturing. This paper proposes a large range OFDR distributed temperature sensing method based on the frequency sampling method and the reference spectral moving method. The frequency sampling method is employed to compensate for the tuning nonlinearity effect of the tunable laser source in the OFDR system, ultimately achieving a spatial resolution of 0.2mm on a fiber under test of 11.1m. However, when the temperature of the fiber under test exceeds the effective range of the system, the phenomenon of the traditional cross-correlation method fails to correctly demodulate the temperature occurs. Therefore, demodulating the spectral shifts by moving the reference Raleigh scattering spectrum. Experimental result shows that by using a narrow sweep range of 4nm, the reference spectral shifting method can stably and reliably measure a temperature range of 50 degrees C to 340 degrees C with a high spatial resolution. In comparison, the traditional cross-correlation method can only test the temperature range of 50 degrees C to 150 degrees C. Therefore, the reference spectral moving method extends the effective temperature measurement range by 2.9 times.

引用

页数：11

共 12 条

[1]

Chen L., 2023, Infrared and Laser Engineering, V52, P82

[2] Compensation of laser frequency tuning nonlinearity of a long range OFDR using deskew filter [J].