Raman DTS Based on OTDR Improved by Using Gain-Controlled EDFA and Pre-Shaped Simplex Code

Rosolem, J.B.; Bassan, Fábio Renato; Freitas, Daiane Eliene de; Salgado, F. C.

doi:10.1109/jsen.2017.2694343

Cited by 30 publications

(10 citation statements)

References 19 publications

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“…Subsequently, more advanced pulse coding technology is applied in Raman distributed optical fiber sensing, and the typical pulse coding schemes and measurement index are shown in Table 3 . Coding technologies mainly incorporate simplex coding 87 , low-repetition-rate cyclic pulse coding 85 , cyclic pseudo-random sequence coding 89 , and pre-shaped simplex code 90 . Sun and Hong proposed and demonstrated a novel demodulation scheme in 2020 92 , which encoded the interrogation optical data using a single-sequence aperiodic code, and resolved the optical fiber data spatially through rapid demodulation processing.…”

Section: Challenges and Methodsmentioning

confidence: 99%

Physics and applications of Raman distributed optical fiber sensing

Zhang

2022

Light Sci Appl

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Raman distributed optical fiber sensing has been demonstrated to be a mature and versatile scheme that presents great flexibility and effectivity for the distributed temperature measurement of a wide range of engineering applications over other established techniques. The past decades have witnessed its rapid development and extensive applicability ranging from scientific researches to industrial manufacturing. However, there are four theoretical or technical bottlenecks in traditional Raman distributed optical fiber sensing: (i) The difference in the Raman optical attenuation, a low signal-to-noise ratio (SNR) of the system and the fixed error of the Raman demodulation equation restrict the temperature measurement accuracy of the system. {ii) The sensing distance and spatial resolution cannot be reconciled. (iii) There is a contradiction between the SNR and measurement time of the system. (iv) Raman distributed optical fiber sensing cannot perform dual-parameter detection. Based on the above theoretical and technical bottlenecks, advances in performance enhancements and typical applications of Raman distributed optical fiber sensing are reviewed in this paper. Integration of this optical system technology with knowledge based, that is, demodulation technology etc. can further the performance and accuracy of these systems.

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Section: Challenges and Methodsmentioning

confidence: 99%

Physics and applications of Raman distributed optical fiber sensing

Zhang

2022

Light Sci Appl

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“…The authors reported the meticulous calibration to insulate external factors in temperature measurement as the main drawback. Raman OTDR technology is still receiving improvements [16] and several commercial systems are based on it [17][18][19]. II.…”

Section: Condition Monitoring Techniquesmentioning

confidence: 99%

A UAV-Based Framework for Semi-Automated Thermographic Inspection of Belt Conveyors in the Mining Industry

Carvalho

Nascimento

D'Angelo

et al. 2020

Sensors

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Frequent and accurate inspections of industrial components and equipment are essential because failures can cause unscheduled downtimes, massive material, and financial losses or even endanger workers. In the mining industry, belt idlers or rollers are examples of such critical components. Although there are many precise laboratory techniques to assess the condition of a roller, companies still have trouble implementing a reliable and scalable procedure to inspect their field assets. This article enumerates and discusses the existing roller inspection techniques and presents a novel approach based on an Unmanned Aerial Vehicle (UAV) integrated with a thermal imaging camera. Our preliminary results indicate that using a signal processing technique, we are able to identify roller failures automatically. We also proposed and implemented a back-end platform that enables field and cloud connectivity with enterprise systems. Finally, we have also cataloged the anomalies detected during the extensive field tests in order to build a structured dataset that will allow for future experimentation.

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“…However, when EDFA is used to magnify the Simplex encoded optical pulse sequence, the transient effect of EDFA will cause serious distortion of the Simplex encoded sequence, so that the temperature curve of the fiber can not be demodulated correctly. Many researchers proposed various solutions to solve this problem [5][6][7]. Rosolem et al proposed pre-distortion of Simplex code sequence to compensate for the transient effect of EDFA [5].…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers proposed various solutions to solve this problem [5][6][7]. Rosolem et al proposed pre-distortion of Simplex code sequence to compensate for the transient effect of EDFA [5]. Dai et al used two directly-modulated distributed feedback (DFB) lasers with different wavelengths, and modulated the return-to-zero (RZ) Simplex coded pulse sequence and its complementary sequence respectively on the two DFB lasers to avoid the transient effect [6].…”

Section: Introductionmentioning

confidence: 99%

Raman distributed temperature sensor based on pulse compression technique using hybrid modulation method

Zeng¹,

Fan²,

He³

2022

Advanced Sensor Systems and Applications XII

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In this paper, a novel distributed Raman distributed temperature sensing system based on pulse compression technique using hybrid modulation method is proposed. The structure of the new system and the corresponding modulation and demodulation methods are described. The system performance is verified by experiments. This scheme solves the inherent problem of mutual restrictions between spatial resolution and temperature resolution existed in conventional Raman distributed temperature sensing systems. Compared with the other scheme not using coding, the hybrid modulation method using intra-pulse sweep and inter-pulse coding not only mitigates the transient effect existed in the fiber amplifier, which results in a better performance.

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Raman DTS Based on OTDR Improved by Using Gain-Controlled EDFA and Pre-Shaped Simplex Code

Cited by 30 publications

References 19 publications

Physics and applications of Raman distributed optical fiber sensing

Physics and applications of Raman distributed optical fiber sensing

A UAV-Based Framework for Semi-Automated Thermographic Inspection of Belt Conveyors in the Mining Industry

Raman distributed temperature sensor based on pulse compression technique using hybrid modulation method

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