scholarly journals A High Sensitivity Temperature Sensing Probe Based on Microfiber Fabry-Perot Interference

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1819 ◽  
Author(s):  
Zhoubing Li ◽  
Yue Zhang ◽  
Chunqiao Ren ◽  
Zhengqi Sui ◽  
Jin Li
Keyword(s):  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Temperature Sensing ◽  
Compact Structure ◽  
Fabry Perot ◽  
Temperature Monitor ◽  
Core Fiber ◽  
Fitting In

In this paper, a miniature Fabry-Perot temperature probe was designed by using polydimethylsiloxane (PDMS) to encapsulate a microfiber in one cut of hollow core fiber (HCF). The microfiber tip and a common single mode fiber (SMF) end were used as the two reflectors of the Fabry-Perot interferometer. The temperature sensing performance was experimentally demonstrated with a sensitivity of 11.86 nm/°C and an excellent linear fitting in the range of 43–50 °C. This high sensitivity depends on the large thermal-expansion coefficient of PDMS. This temperature sensor can operate no higher than 200 °C limiting by the physicochemical properties of PDMS. The low cost, fast fabrication process, compact structure and outstanding resolution of less than 10−4 °C enable it being as a promising candidate for exploring the temperature monitor or controller with ultra-high sensitivity and precision.

scholarly journals A Micro Bubble Structure Based Fabry–Perot Optical Fiber Strain Sensor with High Sensitivity and Low-Cost Characteristics

Sensors ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 555 ◽  
Author(s):  
Lu Yan ◽  
Zhiguo Gui ◽  
Guanjun Wang ◽  
Yongquan An ◽  
Jinyu Gu ◽  
...  
Keyword(s):  
Low Cost ◽  
Strain Sensor ◽  
Glass Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fabry Perot ◽  
Micro Bubble ◽  
Bubble Structure ◽  
Cost Characteristics

A high-sensitivity, low-cost, ultrathin, hollow fiber micro bubble structure was proposed; such a bubble can be used to develop a high-sensitivity strain sensor based on a Fabry–Perot interferometer (FPI). The micro bubble is fabricated at the fiber tip by splicing a glass tube to a single mode fiber (SMF) and then the glass tube is filled with gas in order to expand and form a micro bubble. The sensitivity of the strain sensor with a cavity length of about 155 μm and a bubble wall thickness of about 6 μm was measured to be up to 8.14 pm/μϵ.

scholarly journals Cascaded-Cavity Fabry-Perot Interferometric Gas Pressure Sensor based on Vernier Effect

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3677 ◽  
Author(s):  
Peng Chen ◽  
Yutang Dai ◽  
Dongsheng Zhang ◽  
Xiaoyan Wen ◽  
Minghong Yang
Keyword(s):  
Capillary Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Gas Pressure ◽  
Glass Capillary ◽  
Compact Structure ◽  
Fabry Perot ◽  
Fs Laser ◽  
Vernier Effect

An extrinsic Fabry-Perot interferometer (EFPI) composed of double fiber FP cavities in a glass capillary tube to generate Vernier effect has been fabricated and employed for gas pressure sensing. A lead-in single-mode fiber (LSMF) and a reflective single-mode fiber (RSMF) were inserted into the capillary tube to form a FP cavity. Femtosecond (fs) laser was used to ablate openings on a capillary tube for gas passage to the FP cavity. A fusion hole was also drilled on the end face of a SMF by fs laser. The sensitivity of the sensor is enhanced due to Vernier effect. Experimental results show that the sensitivity was as high as 86.64 nm/MPa in the range of 0~0.6 MPa, which is 32.8 times larger than that of an open-cavity EFPI sensor without Vernier effect. The temperature cross-sensitivity of the sensor was measured to be about 5.18 KPa/°C. The proposed sensor was characterized by its high sensitivity, compact structure and ease of fabrication, and would have extensive application prospects in gas sensing fields.

Experimental Research of Strain and Temperature Based on EFPI Sensor

2011 ◽  
Vol 130-134 ◽  
pp. 4185-4188
Author(s):  
Xiu Feng Yang ◽  
Chun Yu Zhang ◽  
Zheng Rong Tong
Keyword(s):  
Low Cost ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Good Reliability ◽  
High Repetition ◽  
Sensing Applications ◽  
Fabry Perot ◽  
Wet Chemical ◽  
The Many ◽  
Multi Mode

An extrinsic Fabry-Perot (F-P) interferometric (EFPI) sensor by using simple etching and fusing method is proposed and demonstrated. The cavity is formed by wet chemical etching of multi-mode fiber (MMF) end face in hydrofluoric acid solutions, and then it is fused to the end of a single-mode fiber (SMF) to form an extrinsic F-P structure. The strain and temperature of EFPI sensor are studied experimentally. The experimental results show that the interference wavelength becomes 2.648nm longer while the strain increases from 0N to 637N, and the strain sensitivity is about 0.004nm/N, and linearity is 0.999. The interference wavelength becomes 0.032nm shorter while the temperature increases from 20°C to 100°C. This kind of sensor has the many advantages of easy fabrication, good reliability, high-repetition, small size, low cost and mass-production, which offers great prospect for sensing applications.

scholarly journals An Optical Fiber Fabry–Perot Pressure Sensor with Optimized Thin Microbubble Film Shaping for Sensitivity Enhancement

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 358 ◽  
Author(s):  
Shubin Zhang ◽  
Zhenjun Shao ◽  
Jinrong Liu ◽  
Meixue Zong ◽  
Jian Shen ◽  
...  
Keyword(s):  
Thin Film ◽  
Arc Discharge ◽  
Structural Parameters ◽  
Silicon Film ◽  
Glass Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fabry Perot ◽  
Micrometer Scale

A pressure-assisted arc discharge method of preparing silicon microbubbles with a glass tube was utilized for decreasing the bubble film’s thickness and improving the bubble’s uniformity. By controlling the arc discharge intensity, discharge time and the position of the fiber carefully, the thickness of the microbubble film was reduced to the micrometer scale. Later, the thin film of the microbubble was transferred to the end the single-mode-fiber/glass-tube structure, for forming the FP (Fabry–Perot) interference cavity. As the thin film is sensitive to the outer pressure, such a configuration could be used for a high-sensitive-pressure measurement. Experimental results show that the sensitivity of this FP (Fabry–Perot) cavity was 6790 pm/MPa when the outer pressure ranges from 100 to 1600 kPa, and the relationship between the structural parameters of the thin film and the outer pressure was theoretically analyzed. Moreover, this special structure made of the end silicon film microbubble is more suitable for high-sensitivity applications.

scholarly journals A High Precision Fiber Optic Fabry–Perot Pressure Sensor Based on AB Epoxy Adhesive Film

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 581
Author(s):  
Yanan Zhang ◽  
Shubin Zhang ◽  
Haitao Gao ◽  
Danping Xu ◽  
Zhuozhen Gao ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Epoxy Adhesive ◽  
Curing Time ◽  
Adhesive Film ◽  
Interference Spectrum ◽  
Fabry Perot ◽  
Potential Applications

This paper proposes a Fabry–Perot pressure sensor based on AB epoxy adhesive with ultra-high sensitivity under low pressure. Fabry–Perot interference, located between single-mode fiber (SMF) and hollow-core fiber (HCF), is an ultra-thin AB epoxy film formed by capillary action. Then the thick HCF was used to fix the HCF and SMF at both ends with AB epoxy adhesive. Experimental results show that when the thickness of AB epoxy film is 8.74 μm, and the cavity length is 30 μm, the sensor has the highest sensitivity. The sensitivity is 257.79 nm/MPa within the pressure range of 0–70 kPa. It also investigated the influence of the curing time of AB epoxy on the interference spectrum. Experiments showed that the interference spectrum peak is blue-shifted with the increase of curing time. Our study also demonstrated the humidity stability of this pressure sensor. These characteristics mean that our sensor has potential applications in the biomedical field and ocean exploration.

Carbon monoxide gas sensor based on α-Fe2O3/rGOQDs composite film integrated Michelson interferometer

2021 ◽  
Author(s):  
Sijie He ◽  
Yushan Liu ◽  
Wenlin Feng ◽  
Bangxin Li ◽  
Xiao-Zhan Yang ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Composite Film ◽  
Silver Film ◽  
Simple Structure ◽  
High Selectivity ◽  
Michelson Interferometer ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Core Fiber

Abstract A carbon monoxide sensor based on Michelson interferometer combined with α-Fe2O3/rGOQDs composite film is proposed and fabricated. First, a waist-enlarged taper is formed between the single-mode fiber (SMF) and the no-core fiber (NCF), then the other end of the NCF is spliced with a section of thin-core fiber (TCF). Besides, the end of the TCF is coated with a layer of silver film to enhance the reflection. Thus, the Michelson interferometer of SMF-NCF-TCF is formed. The α-Fe2O3/rGOQDs composite film is deposited on the outside surface of TCF. The specific adsorption of carbon monoxide by the composite film leads to the change of the sensor’s effective refractive index (RI), realizing the detection of carbon monoxide. The results show that the interference intensity of the monitoring valley decreases with the increase of the concentration of carbon monoxide. The sensitivity of the sensor is 0.057 dBm/ppm, the detection limit of the sensor is 105 ppb, and the response time and recovery time are 70 s and 100 s, respectively. The sensor has the advantages of high sensitivity, high selectivity and simple structure, and it is expected to be applied for the detection of carbon monoxide gas with low concentration.

A Novel In-Line Fiber Mach–Zehnder Interferometer Temperature Sensor Made of Thermally Expanded Core Fiber

2014 ◽  
Vol 635-637 ◽  
pp. 856-859 ◽  
Author(s):  
Ying Wu Zhou ◽  
Sheng Yu Chen
Keyword(s):  
Temperature Sensor ◽  
Low Cost ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Core Mode ◽  
Temperature Changes ◽  
The Core ◽  
Core Fiber ◽  
Mach Zehnder Interferometer

A novel in-line fiber temperature sensor by splicing a piece of single mode fiber between two thermally expanded core fibers at their core-expanded ends is proposed and demonstrated. This structure forms an all fiber Mach–Zehnder interferometer due to the interference between the core mode and the cladding modes of the single mode fiber. The fabricated sensor is applied to measure temperature changes. The temperature sensitivity of the sensor at a length of 6.3cm is about 65.3 pm/°C. The proposed sensor is low cost, easily fabricated, and may be useful for detection of temperature.

scholarly journals A Composite Fabry-Perot Interferometric Sensor with the Dual-Cavity Structure for Simultaneous Measurement of High Temperature and Strain

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 4989
Author(s):  
Ping Xia ◽  
Yuegang Tan ◽  
Caixia Yang ◽  
Zude Zhou ◽  
Kang Yun
Keyword(s):  
High Temperature ◽  
Simultaneous Measurement ◽  
Strain Measurement ◽  
Fiber Composite ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Compact Structure ◽  
Cavity Structure ◽  
Fabry Perot ◽  
Interferometric Sensor

In this paper, an optical fiber composite Fabry-Perot interferometric (CFPI) sensor capable of simultaneous measurement of high temperature and strain is presented. The CFPI sensor consists of a silica-cavity intrinsic Fabry–Perot interferometer (IFPI) cascading an air-cavity extrinsic Fabry–Perot interferometer (EFPI). The IFPI is constructed at the end of the transmission single-mode fiber (SMF) by splicing a short piece of photonic crystal fiber (PCF) to SMF and then the IFPI is inserted into a quartz capillary with a reflective surface to form a single-ended sliding EFPI. In such a configuration, the IFPI is only sensitive to temperature and the EFPI is sensitive to strain, which allows the achieving of temperature-compensated strain measurement. The experimental results show that the proposed sensor has good high-temperature resistance up to 1000 °C. Strain measurement under high temperatures is demonstrated for high-temperature suitability and stable strain response. Featuring intrinsic safety, compact structure and small size, the proposed CFPI sensor may find important applications in the high-temperature harsh environment.

scholarly journals All Single-Mode-Fiber Supercontinuum Source Setup for Monitoring of Multiple Gases Applications

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3239
Author(s):  
Javier A. Martin-Vela ◽  
Eloisa Gallegos-Arellano ◽  
Juan M. Sierra-Hernández ◽  
Julián M. Estudillo-Ayala ◽  
Daniel Jauregui-Vázquez ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Experimental Results ◽  
Hitran Database ◽  
Broadband Absorption ◽  
Sensing System ◽  
Absorption Technique

In this paper, a gas sensing system based on a conventional absorption technique using a single-mode-fiber supercontinuum source (SMF-SC) is presented. The SC source was implemented by channeling pulses from a microchip laser into a one kilometer long single-mode fiber (SMF), obtaining a flat high-spectrum with a bandwidth of up to 350 nm in the region from 1350 to 1700 nm, and high stability in power and wavelength. The supercontinuum radiation was used for simultaneously sensing water vapor and acetylene gas in the regions from 1350 to 1420 nm and 1510 to 1540 nm, respectively. The experimental results show that the absorption peaks of acetylene have a maximum depth of approximately 30 dB and contain about 60 strong lines in the R and P branches, demonstrating a high sensitivity of the sensing setup to acetylene. Finally, to verify the experimental results, the experimental spectra are compared to simulations obtained from the Hitran database. This shows that the implemented system can be used to develop sensors for applications in broadband absorption spectroscopy and as a low-cost absorption spectrophotometer of multiple gases.

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