scholarly journals Deployment and Comparison of a Low-Cost High-Sensitivity Concentration Meters Using Micro-Optical Resonators

Proceedings ◽  
2020 ◽  
Vol 60 (1) ◽  
pp. 53
Author(s):  
Amir R. Ali ◽  
Maram Wael ◽  
Reem Amr Assal
Keyword(s):  
Chemical Composition ◽  
Morphological Changes ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Optical Resonators ◽  
Optical Resonator ◽  
Single Mode Laser ◽  
Varied Chemical ◽  
Very High

Micro-optical resonators have been introduced as sensors in many applications for a wide number of variable types of stimuli due to their very high resolution, high sensitivity, and high-quality factor. In this paper, a novel micro-optical sensor was designed and tested as a concentration meter for chemical composition of a solution. The micro-optical resonator used is based on whispering gallery mode (WGM). This phenomenon appears when a tapered, single-mode laser carrying micro-optical fiber is evanescently coupled with a polymeric or silica micro-optical resonator. The presented sensor shows the change in concentration by experiencing a change in its morphology due to the varied viscosity of its environment. The variation of concentrations or fluid contents results in a change between the radii of the micro-optical resonator. With varied chemical composition and concentration in the tested sample varied infinitesimally small morphological changes are detected. The change in the resonators shape is read as a WGM shift in the resonance transmission spectrum, which is interpreted using a technique called cross-correlation, which compares the output across time to display the shift, which is later translated into distinct concentration levels. The proposed, exceptionally low-cost sensors were able to detect change at very high resolutions allowing better sensitivity along with wider range of variation. Experimental work for detection of ranges of concentrations of variable type of contaminants is presented.

scholarly journals INVESTIGATING THE EFFECT OF TAPER LENGTH ON SENSITIVITY OF THE TAPERED-FIBER BASED TEMPERATURE SENSOR

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Baktiar Musa ◽  
Yasmin Mustapha Kamil ◽  
Muhammad Hafiz Abu Bakar ◽  
Ahmad Shukri Mohd Noor ◽  
Alyani Ismail ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Optimum Parameter ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Careful Selection ◽  
Tapered Fiber ◽  
Tapered Optical Fiber ◽  
Good Repeatability ◽  
Selection Of

A temperature sensor using single-mode tapered fiber is presented. To better understand the behaviour of a tapered optical fiber, transmission experiments with different taper profiles, specifically waist length were performed. The effects of taper profiles on the sensitivity of the sensor were also investigated. It is demonstrated that careful selection of the taper profile can increase the sensitivity of the sensor. In our experiment, a good temperature sensing result was achieved using the optimum parameter. The best sensitivity achieved was 45.5 pm/°C that measured the range of temperature from 30°C to 120°C. The fabricated sensors are easy to fabricate and relatively low cost. Our results indicate that the tapered fiber based temperature sensor has high sensitivity and good repeatability.  

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.

A Novel and Simple Electrochemical Glucose Biosensor Based on a Silicon Nanowire Array Electrode

2014 ◽  
Author(s):  
Che-Wei Hsu ◽  
Wen-Chao Feng ◽  
Kang J. Chang ◽  
Gou-Jen Wang
Keyword(s):  
Low Cost ◽  
Silicon Nanowire ◽  
Nanowire Array ◽  
High Sensitivity ◽  
Glucose Biosensor ◽  
Glucose Detection ◽  
Redox Peak ◽  
Array Electrode ◽  
Silicon Nanowire Array ◽  
Very High

In this study, a novel and simple electrochemical glucose biosensor based on a silicon nanowire array (SNA) electrode was proposed. Metal-assisted etching (MAE) method using an AgNO3 and HF mixing solution as the etchant was employed to grow the silicon nanowire array (SNA) electrode. A thin gold shell is then sputtered over each silicon nanowire. Potassium ferricyanide, glucose oxidase (GOx), and a Nafion thin film were then sequentially coated onto the fabricated SNA for glucose detection. The processing time of the MAE and sputtering as well as the GOx concentration were optimized in terms of the redox peak currents of the SNA electrode. Compared with the corresponding plane gold electrode, the effective sensing area of the synthesized SNA electrode was measured to be 6.12 folds. Actual glucose detections demonstrated that the proposed SNA array electrode could operate in a linear range of 0.55 mM-11.02 mM and a very high sensitivity of 346 μA mM−1 cm−2. The proposed SNA electrode based glucose biosensor possesses advantages of simple fabrication process, low cost, and high sensitivity. It is feasible for future clinical applications.

A PNA-Mediated Clamping PCR for Routine Detection of KRAS Mutations in Colorectal Carcinoma

2014 ◽  
Vol 29 (1) ◽  
pp. e55-e61 ◽  
Author(s):  
Francesca Messa ◽  
Federica Tonissi ◽  
Enrico Millo ◽  
Enrico Bracco ◽  
Silvana Ungari ◽  
...  
Keyword(s):  
Colorectal Carcinoma ◽  
Low Cost ◽  
Screening Method ◽  
High Sensitivity ◽  
Kras Mutations ◽  
Laboratory Equipment ◽  
Highly Sensitive ◽  
Appropriate Therapy ◽  
Definition Of ◽  
Very High

The detection of somatic mutations in a tumor represents a valuable tool for tumor characterization and provides the clinicians with information for setting up the most appropriate therapy. KRAS mutations in codons 12 and 13 are important biomarkers routinely analyzed in the clinic for the management of anti-EGFR treatment in colorectal carcinoma (CRC). Here we report a sensitive and inexpensive assay for KRAS mutations based on a PNA-mediated PCR clamping. The assay displays very high sensitivity (0.7%) and specificity (96.7%) when compared to traditional sequencing (SS) and pyrosequencing (PS), two of the most commonly and routinely used methods employed today by diagnostic laboratories. Furthermore, the PNA assay requires only basic and low-cost laboratory equipment, in contrast with all the most recent PCR-based technologies, which are highly sensitive but also much more expensive. Finally, despite the PNA assay does not allow for the definition of specific mutations, it is the cheapest and easiest screening method to firstly stratify wild-type and mutated patients, information that is strictly necessary to clinicians for the management of CRC and anti-EGFR treatment.

scholarly journals Photonic skins based on flexible organic microlaser arrays

2021 ◽  
Vol 7 (31) ◽  
pp. eabh3530
Author(s):  
Chunhuan Zhang ◽  
Haiyun Dong ◽  
Chuang Zhang ◽  
Yuqing Fan ◽  
Jiannian Yao ◽  
...  
Keyword(s):  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Single Mode ◽  
Direct Writing ◽  
Practical Applications ◽  
Single Mode Laser ◽  
Integrated Devices ◽  
Laser Sources ◽  
Mechanical Sensor

Flexible photonics is rapidly emerging as a promising platform for artificial smart skins to imitate or extend the capabilities of human skins. Organic material systems provide a promising avenue to directly fabricate large-scale flexible device units; however, the versatile fabrication of all-organic integrated devices with desired photonic functionalities remains a great challenge. Here, we develop an effective technique for the mass processing of organic microlaser arrays, which act as sensing units, on the chip of photonic skins. With a bilayer electron-beam direct writing method, we fabricated flexible mechanical sensor networks composed of coupled-cavity single-mode laser sources on pliable polymer substrates. These microlaser-based mechanical sensor chips were subsequently used to recognize hand gestures, showing great potential for artificial skin applications. This work represents a substantial advance toward scalable construction of high-performance and low-cost flexible photonic chips, thus paving the way for the implementation of smart photonic skins into practical applications.

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 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.

scholarly journals Self-Imaging Effect in Liquid-Filled Hollow-Core Capillary Waveguide for Sensing Applications

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 135 ◽  
Author(s):  
Yijian Huang ◽  
Shuhui Liu ◽  
Lichao Zhang ◽  
Yiping Wang ◽  
Ying Wang
Keyword(s):  
Simple Structure ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Fiber Optic Sensor ◽  
Hollow Core ◽  
Sensing Applications ◽  
Index Matching ◽  
Potential Applications ◽  
Physical And Chemical

A high sensitivity fiber-optic sensor based on self-imaging effect in a hollow-core capillary waveguide (HCCW) is presented for sensing applications. The sensor is composed of a section of HCCW fusion spliced between single mode fibers (SMFs). The self-imaging effect in the HCCW is investigated with different fiber lengths and arc-fusion parameters. By infiltrating the hollow core with index matching liquids, the peak wavelength of the proposed device shifts towards longer wavelengths. The temperature and refractive index (RI) responses of the sensor are studied systematically. When temperature is increased from 25 °C to 75 °C, the temperature sensitivity of the device can be improved significantly with the infiltrated structure, and reaches −0.49 nm/°C, compared with that of the un-filled device, which is 9.8 pm/°C. For the RI response, the liquid-filled structure achieves sensitivity of 12,005 nm/RIU in the range between 1.448 and 1.450, slightly higher than the 11,920 nm/RIU achieved by the un-filled one. The proposed sensor exhibits the advantages of simple structure, high sensitivity and low cost, which may find potential applications in physical and chemical sensing.

Dual Fabry–Pérot Interferometric Carbon Monoxide Sensor Based on the PANI/Co3O4 Sensitive Membrane-Coated Fibre Tip

2019 ◽  
Vol 74 (2) ◽  
pp. 101-107 ◽  
Author(s):  
Jin Peng ◽  
Wenlin Feng ◽  
Xiaozhan Yang ◽  
Guojia Huang ◽  
Shaodian Liu
Keyword(s):  
Carbon Monoxide ◽  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Photonic Crystal Fibre ◽  
Single Mode Fibre ◽  
Fabry Perot ◽  
Response And Recovery ◽  
Sensing Membrane ◽  
Mode Fibre

AbstractA novel dual Fabry–Pérot (F-P) interferometric carbon monoxide gas sensor based on polyaniline/Co3O4 (PANI/Co3O4) sensing film coated on the optical fibre end face is proposed and fabricated. Its structure is composed of standard single-mode-fibre (SMF), endlessly photonic crystal fibre (EPCF), and PANI/Co3O4 sensing membrane (PCSM). Therefore, they form three F-P reflectors, the reflector between SMF and EPCF, that between EPCF and PCSM, and interface between PCSM and air. So, the dual F-P interferometer is achieved. The results show that in the range of 0–70 ppm, the interference spectra appear red shift with the increasing carbon monoxide concentration. In addition, the high sensitivity of 21.61 pm/ppm, the excellent linear relationship (R2 = 0.98476), and high selectivity for carbon monoxide are achieved. The response and recovery time are 35 and 84 s, respectively. The sensor has the advantages of high sensitivity, strong selectivity, low cost, and simple structure and is suitable for sensitive detection of trace carbon monoxide gas.

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