Sensor Letters最新文献

{"title":"Efficient Adsorption of Acid Black 52 from Aqueous Solution by Biochar Prepared from Deoiled Algae Biomass: Process Optimization","authors":"P. Nautiyal, Ashok Kumar","doi":"10.1166/sl.2020.4173","DOIUrl":"https://doi.org/10.1166/sl.2020.4173","url":null,"abstract":"The attempt was made to prepare the novel biochar (BC) from deoiled Spirulina platensis algae biomass (DB) which was obtained after single stage oil extraction and transesterification. The adsorption capacity of biochar for acid black 52 dye (AO) removal from individual aqueous solution was investigated. The optimization of process parameters such as effect of initial concentration of AO dye, dosage of adsorbent and the pH of the given solution on the dye adsorption was also examined. The results from the experiments were further compared with those obtained with commercially available activated carbon (AC). The results showed that with the rise in initial concentration of dye from 30 mg/l till 90 mg/l, there was rise in the percentage removal of dye from 86.67% to 89.84%. The percentage dye removal to some extent got improved from 86.60% to 87.80% using biochar while increasing the dosage of adsorbent from 0.2 to 1 g/100 ml. The removal of dye declined from 88.44% to 85.80% using BC while increasing pH from 2 to 10. From the results obtained, it can be concluded that biochar is a potential adsorbent for dye removal, thus supporting the sustainability of biodiesel from algae.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"86 1","pages":"47-51"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90320200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of Mercaptostyrene Divinyl Benzene Immobilized on Ion-Exchange Polymeric Membrane as Hg(II) Sensor","authors":"Abdellah Hamel, K. Morakchi, A. Bendjama, Hiba Mahfoud, Rochedi Kherrat","doi":"10.1166/sl.2020.4174","DOIUrl":"https://doi.org/10.1166/sl.2020.4174","url":null,"abstract":"Herein, we report the fabrication of electrochemical sensor for the detection of mercury Hg(II) ions using macroporous divinyl benzene immobilized on ion-exchange polymeric ionophore. Impedance spectroscopy was adopted to examine the performance of the fabricated sensor. Various experiments were done to get the optimized experimental conditions of the fabricated sensor. The fabricated sensor demonstrates a linear range of 10–8 to 10–5 M and low detection limit was about 10–4.8 M.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"4 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81521527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and Analysis of Micro-Opto-Mechanical System Cantilever Integrated with Photonics Waveguide for Pressure Sensing Applications","authors":"Veer Chandra, Rakesh Ranjan","doi":"10.1166/sl.2020.4178","DOIUrl":"https://doi.org/10.1166/sl.2020.4178","url":null,"abstract":"In this work, the pressure sensing approach based on the Micro-Opto-Mechanical System (MOMS) cantilever integrated with waveguide structure has been explored. The MOMS based photonic sensors are drawing attention because of their high sensing capabilities. In the design of MOMS based cantilever pressure sensor, mainly two different waveguide structures, Rib and Slot waveguides have been considered. The deviation in light intensity at the output of the waveguide structure is mainly used to analyze the amount of exerted pressure at the free-end of cantilever. Using the different waveguide parameters such as, effective mode area, light intensity variations, etc., the performance comparison between Rib and Slot waveguides have been done. The relationship between the normalized light intensity at the waveguide output corresponding to the applied pressure has been established from the relationship between the deflection versus pressure and normalized intensity versus deflection. It has been anticipated that the performance of pressure sensor using Slot waveguide is significantly better than the Rib waveguide for some application.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"31 1","pages":"18-25"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86534609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Refractive Index Based Micro-Structured Sensor for Blood Components Detection in Terahertz Regime","authors":"Md. Ahasan Habib","doi":"10.1166/sl.2020.4186","DOIUrl":"https://doi.org/10.1166/sl.2020.4186","url":null,"abstract":"In this article, a hexagonal packing photonic crystal fiber based optical sensor is presented and analyzed for different blood components identification using terahertz (THz) signal. The numerical analysis of the proposed sensor is performed by using finite element method based software Comsol V5.0. The proposed fiber is investigated in terahertz frequency spectrum from 1.3 THz to 2.5 THz for higher relative sensitivity and numerical aperture as well as lower absorption loss and confinement loss for better sensing applications. The reported hollow core fiber provide better interaction of light and the analytes, so that high relative sensitivity of 83.45%, 81.20%, 80.78%, 79.60% and 78.80% are obtained for RBCs, Hemoglobin, WBCs, Plasma and Water respectively at a particular geometric condition. Moreover, very low confinement loss and absorption loss with high numerical aperture is offered by the proposed sensor in terahertz spectrum. This optical sensor may be an alternative option to detect blood components present in the blood in a very efficient manner.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"17 1","pages":"74-82"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85048614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Analysis and Optimal Design of All-Optical Fiber Differential Acceleration Sensor","authors":"Ya‐Lin Li, Xiaoqian Cui, X. Fang","doi":"10.1166/sl.2020.4175","DOIUrl":"https://doi.org/10.1166/sl.2020.4175","url":null,"abstract":"In order to improve the sensitivity of measurement and realize its miniaturization, an all-optical fiber differential acceleration sensor is studied. This sensor adopts a novel four-port ring fiber coupler, which can realizes the difference of optical signals and the isolation of light source and optical signal. Therefore, the sensitivity of this sensor is doubled compared with that of traditional fiber sensors. The stress–strain relationship simulation results of the sensor probe model show that with the increase of the measured acceleration value, the relative sensitivity, relative resolution, and relative error of the sensor all decrease. In the structural parameters of the probe-sensitive unit, the film thickness has the greatest influence on the performance of the sensor. The radius of the diaphragm 65 μm, a thickness of 2 μm, taking the thickness of the center of mass 20 μm, the mass 20 μm taken radius conditions, sensitivity of this fiber acceleration sensor is not less than 0.0025 m–1 · s2, less than 2% error, the linear measuring range of 0 to 2800 m · s–2. This design combines microelectronics and optical fiber technology, which can more easily realize the miniaturization and multi-function of acceleration sensor.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"18 1","pages":"12-17"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79820022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustical Studies on Beryllium Oxide/Silicone Oil Nanofluids","authors":"T. M. A. Britto, A. Jeevaraj","doi":"10.1166/sl.2020.4191","DOIUrl":"https://doi.org/10.1166/sl.2020.4191","url":null,"abstract":"Molecular interactions of Silicone oil based Beryllium oxide nanofluids have been studied using ultrasonic parameters at room temperature. BeO nanoparticles synthesized by chemical precipitation method was used to prepare silicone oil based BeO nanofluids. BeO nanofluids were prepared by dispersing synthesized BeO nanoparticles in the Silicone Oil base fluid with the help of sonication. Ultrasonic velocity for particle-fluid mixtures of Silicone oil with BeO has been carried out for different volume fraction (0 to 0.003) at 0.0005 intervals at room temperature. The data experimentally measured has been used to estimate the various acoustical and thermodynamical parameters. The behavior of these parameters in this particle fluid system has been discussed in terms of inter/intramolecular interactions with respect to concentration. The particle base fluid molecular interactions in the nanofluids cause an increment in velocity value of Silicone oil based nanofluids. The propagation of ultrasonic waves causes impedance which increases the intermolecular distance between the molecules. The transmission and reflection modes of sound waves in the nanoparticle and base fluid molecules are noted by the specific acoustic impedance. It is noted that the acoustic impedance value increases with rise in concentration owing to the molecular interaction between BeO and silicone oil fluid molecules affecting the structural arrangement.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"11 1","pages":"69-73"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88714558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced Thermal Conductivity of Carboxyl (–COOH) Functionalized Multi-Walled Carbon Nanotube (MWCNT)-Silicone Oil Based Nanofluids","authors":"M. Premalatha, N. Preetha, S. Padmavathi, A. Jeevaraj","doi":"10.1166/sl.2020.4188","DOIUrl":"https://doi.org/10.1166/sl.2020.4188","url":null,"abstract":"Thermal conductivity and viscosity studies of carboxyl (–COOH) functionalized multi-walled carbon nanotubes-Silicone oil nanofluids were discussed in this work. Carboxyl (–COOH) functionalized MWCNT-Silicone oil nanofluids were prepared in various concentration ranges from 0.001 to 0.005 g of COOH-MWCNT and characterized at a range of temperatures between 303 K to 323 K. The thermal conductivity of carboxyl (–COOH) functionalized MWCNT-Silicone oil nanofluids increases with the raise in concentration of MWCNTs and also with the raise in temperatures. Mechanism for the enhancement of Silicone oil with concentration of MWCNT is due to the percolation of heat through the nanotubes through axial direction than through radial direction. Because of large aspect ratio of nanotubes heat transfer inside MWCNTs is also more. Also, as the temperature increases the viscosity of the (–COOH) functionalized MWCNT-Silicone oil nanofluids decreases, because CNT aggregation kinetics may contribute resulting in enhanced thermal conductivity.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"13 1","pages":"52-54"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89071470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of the Vibratory Analysis by Enhancement of Accelerometer Characteristics","authors":"S. Belkhiri, Z. Ghemari, S. Saad, Ghania Boudechiche","doi":"10.1166/sl.2020.4185","DOIUrl":"https://doi.org/10.1166/sl.2020.4185","url":null,"abstract":"In this work, the mathematical model suitable for the operating principle of the piezoelectric accelerometer is extracted then this model which connects the accuracy and the measurement error according of the frequency ration and the damping rate is validated by simulation. The model developed makes it possible to improve the performances of the accelerometer such as precision, sensitivity and reliability as well as to propose a new conception of the latter. A comparative study is made to show the importance of our results compared to literature, these results have showed that a suitable and appropriate choice of damping ratio develops the accelerometer parameters and enhances the vibratory analysis technique.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"39 1","pages":"39-42"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78046679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anionic Surfactant Sensing by Optical Properties of Erythrosin B","authors":"Zainab Saberi","doi":"10.1166/sl.2020.4177","DOIUrl":"https://doi.org/10.1166/sl.2020.4177","url":null,"abstract":"The nonlinear optical properties, absorbance and fluorescence spectra of Erythrosin B (ErB) aqueous solution in different CTAB concentration was studied. Z-scan technique under laser light excitation at 532 nm, was used for study reverse saturable absorption (RSA) of ErB. it was observed that the RSA of solution depend on CTAB concentration. A enhancing of absorbance and quenching of fluorescence is observed with increase of CTAB concentration in solution and the RSA can reduce the fluorescence intensity. It was proposed that the micelle can reduce the dye aggregation is solutions and it can affect on linear and nonlinear optical properties of ErB.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"89 1","pages":"43-46"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72853486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tango Binary Search Tree Based Asymmetric Cryptographic Sensor Node Authentication for Secured Communication in Wireless Sensor Networks","authors":"A. Cynthia, V. Saravanan","doi":"10.1166/sl.2020.4189","DOIUrl":"https://doi.org/10.1166/sl.2020.4189","url":null,"abstract":"Wireless sensor network (WSN) comprises the group of sensor nodes distributed to sense and monitor the environments and collects the data. Due to the distributed nature of the sensor nodes, security is a major role to access the confidential data and protect the unauthorized access. In order to improve the secure communication, authentication is essential process in WSN. A Tango Binary Search Tree based Schmidt Cryptographic Sensor Node Authentication (TBST-SCSNA) technique is introduced for secured data communication in WSN with higher authentication accuracy. Initially, the trust values for each sensor nodes are calculated for increasing the security in data communication. The sensor nodes in WSN are arranged in tango binary search tree based on the trust value. The nodes in tree are inserted or removed based on their deployment. After that, the Schmidt-Samoa cryptographic technique is applied for node authentication and secure data communication. The cryptographic technique comprises three processes key generation, encryption and decryption. In key generation phase, the public key (i. e., node_ID) are generated and distributed for the sensor nodes and private key is kept secret using Schmidt-Samoa algorithm. The root node is embedded with a key during the deployment and it is controlled the entire the sensor nodes in the path. A Parent node generates the keys for child node based on the ID of parent node. After the key generation, the sender node encrypts the data packet and transmits to receiver node in the tree with the receiver node ID. After that, the receiver node enters their private key and verifies it with already stored key at the time of key generation. If both keys are same, then the node is said to be authentic node. Otherwise, the sensor node is said to be a malicious node. The authentic node only receives the original data packets. This process gets repeated till all the nodes in the path verify their identities and performs the secure communication. Simulation is carried out with different parameters such as authentication accuracy, authentication time and security level with respect to a number of sensor nodes and a number of data packets. The results observed that the TBST-SCSNA technique efficiently improves the node authentication accuracy, security level with minimum time than the state-of-the-art-methods.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"61 1","pages":"55-63"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74509267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}