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Special Issue "Developments and Applications of Optical Fiber Sensors"

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Leibniz Institute of Photonic Technology, 07745 Jena, Germany
Interests: fiber optics; optical fiber sensing; holographic endoscope; multimode fiber imaging

Special Issue Information

Dear Colleagues,

Optical fiber sensors have emerged as a promising technology for a wide range of applications, including civil structural health monitoring, environmental sensing, biomedical diagnostics, aerospace and defense monitoring, industrial process control, etc. The ability of optical fibers to transmit light signals with minimal loss, coupled with their high sensitivity to external stimuli, make them ideal candidates for sensing applications.

One of the key themes of this Special Issue is the development of optical fiber sensors for real-world applications, particularly discussing the challenges associated with deploying optical fiber sensors in harsh environments and proposing solutions for robust and reliable sensing.

Another important aspect of this Special Issue is the exploration of new sensing schemes based on optical fibers. It will cover topics such as distributed sensing, micro/nano-structured fiber sensors, multiplexing, and hybrid sensing systems, which are promising for enabling new sensing applications with enhanced performance and capabilities.

Overall, this Special Issue aims to provides a comprehensive overview of the latest research and developments in optical fiber sensors. It will be of interest to researchers, engineers, and practitioners working in the field of optical fiber sensing, as well as those interested in the broader applications of sensing technology.

Dr. Yang Du
Guest Editor

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Keywords

optical fiber sensors
distributed fiber optic sensing
optical fiber chemical sensors
optical fiber biosensors
resonance-based sensors
fiber gratings sensors
microstructured fibers
nanostructured fibers

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Research

Open AccessArticle

Evaluation of a Scintillating Plastic Optical Fiber Device for Measuring kV-Cone Beam Computed Tomography Dose

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Sensors 2023, 23(18), 7778; https://doi.org/10.3390/s23187778 - 09 Sep 2023

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Abstract

Background: Justification of imaging procedures such as cone beam computed tomography (CBCT) in radiotherapy makes no doubt. However, the CBCT composite dose is rarely reported or optimized, even though the repeated CBCT cumulative dose can be up to 3% of the prescription dose. This study aimed to evaluate the performance and utility of a new plastic scintillating optical fiber dosimeter for CBCT dosimetric quality assurance (QA) applications before a potential application in patient composite CBCT dosimetry. Methods: The dosimeter, made of 1 mm diameter plastic fiber, was installed under a linear accelerator treatment table and linked to photodetectors. The fiber impact on the fluence and dose delivered was respectively assessed with an electronic portal imaging device (EPID) and EBT3 Gafchromic^® film. The presence of artifacts was visually evaluated on kV images. The dosimeter performances were determined for various acquisition parameters by comparison with ionization chamber values. Results: The maximum impact of the fiber on the fluence measured by the EPID was −1.2% for the 6 MV flattening filter-free beam. However, the fiber did not alter the film dose profile when measured for all the beams tested. The fiber was not visible at energies ≥ 80 kV and was merely visible on the CBCT images. When the rate of images per second or mA was changed, the maximum relative difference between the device and the ionization chamber CTDIs was <5%. Changing collimation led to a −7.2% maximum relative difference with an absolute dose difference that was insignificant (−0.3 mGy). Changing kV was associated with a −8.7% maximum relative difference, as published in the literature. Conclusions: The dosimeter may be a promising device for CBCT recurrent dosimetry quality control or dose optimization. According to these results, further developments are in progress in order to adapt the solution to the measurement of patient composite CBCT doses. Full article

(This article belongs to the Special Issue Developments and Applications of Optical Fiber Sensors)

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Open AccessCommunication

Integrated Fiber Ring Laser Temperature Sensor Based on Vernier Effect with Lyot–Sagnac Interferometer

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Sensors 2023, 23(14), 6632; https://doi.org/10.3390/s23146632 - 24 Jul 2023

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Abstract

The Vernier effect created using an incorporated Lyot–Sagnac loop is used to create an ultra-high sensitivity temperature sensor based on a ring laser cavity. Unlike standard double Sagnac loop systems, the proposed sensor is fused into a single Sagnac loop by adjusting the welding angle between two polarization-maintaining fibers (PMFs) to achieve effective temperature sensitivity amplification. The PMFs are separated into two arms of 0.8 m and 1 m in length, with a 45° angle difference between the fast axes. The sensor’s performance is examined both theoretically and experimentally. The experimental results reveal that the Vernier amplification effect can be achieved via PMF rotating shaft welding. The temperature sensitivity in the laser cavity can reach 2.391 nm/°C, which is increased by a factor of more than eight times compared with a single Sagnac loop structure (0.298 nm/°C) with a length of 0.8 m without the Vernier effect at temperatures ranging from 20 °C to 30 °C. Furthermore, unlike traditional optical fiber sensing that uses a broadband light source (BBS) for detection, which causes issues such as low signal-to-noise ratio and broad bandwidth, the Sagnac loop can be employed as a filter by inserting itself into the fiber ring laser (FRL) cavity. When the external parameters change, the laser is offset by the interference general modulation, allowing the external temperature to be monitored. The superior performance of signal-to-noise ratios of up to 50 dB and bandwidths of less than 0.2 nm is achieved. The proposed sensor has a simple structure and high sensitivity and is expected to play a role in biological cell activity monitoring. Full article

(This article belongs to the Special Issue Developments and Applications of Optical Fiber Sensors)

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Special Issue "Developments and Applications of Optical Fiber Sensors"

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