2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)最新文献

{"title":"Thermal analysis of cantilever MEMS based Low power microheater array for the selective detection of explosive and toxic gases","authors":"Sugato Ghosh, S. Chatterjee, A. Kundu, S. Maity, H. Saha","doi":"10.1109/ISPTS.2012.6260949","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260949","url":null,"abstract":"A cantilever type microheater array consisting of four individual isolated microheaters on single die has been designed here for MEMS based gas sensor platform using metal oxide semiconductor for different gas detection through a single sensor die for explosive and toxic gas analysis in the underground manhole. A thin SiO2/Si3N4 cantilever of 250µn X 100µn has been designed here for low power consumption and uniform temperature distribution throughout the entire active area. As the microheaters are isolated from each other, different temperatures may be achieved by applying different voltages in different heaters.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"3 1","pages":"290-293"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87822575","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":"Thick film hydrogen sensor based on nanocrystalline nickel ferrite prepared using simple microwave oven","authors":"S. Tatkare, S. Rane, S. Gosavi","doi":"10.1109/ISPTS.2012.6260926","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260926","url":null,"abstract":"This paper reports the synthesis of nano crystalline nickel ferrite (NiFe2O4) by solvothermal technique using simple microwave oven. This ferrite nano powder was used as a functional material in the thick film sensors. Thick film sensors were fabricated using screen printing technique. The structural, microstructural, thermal analysis of powder and the film were characterized by XRD, SEM and TG analysis. The hydrogen sensing properties of the sensor was detected by measuring the change in resistance under the exposure of gas. The results show that nickel ferrite provides good sensitivity nd response to H2 gas at an operating temperature of 175°C.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"38 1","pages":"212-215"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82865153","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":"Distributed multi-sensor network for real time monitoring of illumination states for a reconfigurable solar photovoltaic array","authors":"B. Patnaik, J. Mohod, S. Duttagupta","doi":"10.1109/ISPTS.2012.6260892","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260892","url":null,"abstract":"In a solar photovoltaic (SPV) array [mxn] the solar modules are connected in series and parallel to achieve desired power output. The SPV array performance depends on different parameters such as incident insolation, temperature, array layout, shading etc. Shading due to cloud cover results in Non-Uniform Illumination (NUI STATES- BRIGHT, GREY and DARK). Mismatch in currents and voltages of the modules due to change in one or more parameters leads to loss in output power. Hence real time monitoring of current (I, di/dt) for each solar module and bypass diode in the SPV array is necessary. In addition temperature sensors are required to monitor open-circuit voltage (Voc) fluctuations. Previously, we have demonstrated optimization of an SPV array in BRIGHT and DARK state [1]. However in field testing we have observed an intermediate GREY state as well. The power output can be depressed in a string having multiple state modules in series. In this paper we have proposed a reconfiguration strategy whereby modules are categorized into BRIGHT, GREY, and DARK illumination states. Based on this strategy it has been demonstrated that a reconfigured SPV array will yield maximum power at the highest operating voltage.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"26 1","pages":"106-109"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85429433","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":"Overview and innovations in LTCC manufacturing for 3D, sensors and MEMS applications","authors":"Roderik Hoppener, Ronald van Olmen, Martin De Moya, Joze Stupar","doi":"10.1109/ISPTS.2012.6260966","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260966","url":null,"abstract":"An overview of the state of the art LTCC process, technology and its applications will be presented. LTCC integrated electronic circuit technology is currently developing rapidly into new areas. Well known for its robustness and suitability for high frequency circuits, LTCC is now developing into new applications such as MEMS sensors and actuators. New possibilities are created by 3D fluidic integration for sensors and micro reactors. With ever increasing requirements for miniaturisation, optimized processing methods have been developed. The new LTCC processing methods enable higher accuracies of the produced parts while facilitating the incorporation of 3D channels in production environments. The higher accuracy methods however also put constraints on the properties of the materials used making it necessary to choose the correct process and material for its application.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"31 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86924708","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":"Electroceramics for sensors and actuators","authors":"C. Prakash","doi":"10.1109/ISPTS.2012.6260919","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260919","url":null,"abstract":"Electroceramics is a class of very important and versatile ceramic materials whose electrical properties are exploited to make devices for a number of advanced applications for civil and military use. These materials include: ferrites, ferroelectrics, piezoelectrics, pyroelectrics, microwave dielectrics etc. Their physical and chemical properties are sensitive to a change in the environment such as temperature, pressure, electric field, magnetic field etc. They form essential component of any smart system. Most of the practical applications are based on bulk ceramics. A material can be tailored by suitable substitutions to get desired characteristics to meet specific requirements. Though the material properties are predominantly governed by composition, processing methodology plays an important role to control material performance and thus optimization of processing parameters become very crucial. Here development of microwave ferrites and dielectrics for phase shifters, prizoelectrics for actuator applications and pyroelectrics for IR detectors are described. Some of the novel material processing techniques shall also be presented.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"38 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83487277","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":"LPG and NH3 sensing characteristics of 1-D interlinked nanowired Co3O4 films deposited by using pulsed D.C. electrochemical deposition method","authors":"P. Shelke, Y. Khollam, M. Chaskar, K. Mohite","doi":"10.1109/ISPTS.2012.6260866","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260866","url":null,"abstract":"Presently, our environment is polluted by number of gases exhausted from auto and chemical industry. The detection of harmful gases is becoming a need of society. Sensors play an important role in the areas of emissions control, environmental protection, public safety and human health. Over the past decades, several kinds of gas sensors have been developed. Co3O4 is an important p-type semiconductor with a normal spinel structure and it has many commercial or potential applications. However, literature research revealed that thin film gas sensors based on Co3O4 are not reported up to now. In view of this, the LPG and NH3 sensing characteristics of 1-D interlinked nanowired Co3O4 films deposited by using pulsed D.C. electrochemical deposition method are presented in this paper. The (CH3COO)2Co.4H2O (0.5 M) and H3BO3 (0.15 M) were dissolved one by one in 250 ml of double distilled water and then filtered using Whatman 41 filter paper. The cobalt based thin films were deposited on thoroughly cleaned stainless steel (SS) and copper (CU) substrates (each of size: 2 cm × 2 cm & thickness = 0.5 mm) using pulsed DC electrochemical deposition method. The films were deposited by using following parameters: (1) pH of solution ∼ 4.5 (by adding NaOH / HCl in solution), (2) cathode-anode distance ∼ 2.5 cm, (3) pulsed deposition on time = 1.5 minute, (4) pulsed off time = 20 sec, (5) total deposition time = 11 minute and (6) current density ∼ 8 mA/cm2. All as-deposited films were heated at 350 °C for 2 hr. The films prepared on SS and CU substrates were identified as PESA and PEUA respectively. The resultant films were characterized by using X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM). The LPG and NH3 gas sensing properties: sensitivity factor (S.F.), response time, recovery time and repeatability of these films were measured at room temperature (RT) by using home-built static gas sensing system at different concentrations ranging from ∼ 25 to 350 ppm of a given test gas.The XRD and Raman spectroscopy studies clearly indicated the formation of pure Co3O4 phase in these films. The values of lattice parameter (ao) calculated for PESA and PEUA films are found to be 8.063 Å and 8.062 Å respectively, which are found to be matching with reported value = 8.084 Å for cubic spinel Co3O4. The morphological studies of films by SEM showed some interesting observations. The surface of each film is found to be covered with the mesh of interlinked wires with more or less flat base. The interlinked wired mesh is noted to be attached firmly to base at different points with the insertion of ends of wires into the surface at those points. The diameters and lengths of 1-D interlinked wires are found to be between 250 – 350 nm and 2 – 10 µm respectively. The densification at the surface of each film is seen to be moderate, however, qualitatively the densification below the interlinked wired mesh structure is found to be good. The LPG and NH3 g","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"4 1","pages":"21-24"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86709363","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":"Gas sensing properties of the fluorine-doped tin oxide thin films Prepared by advanced spray pyrolysis","authors":"P. S. Shewale, M. Uplane","doi":"10.1109/ISPTS.2012.6260861","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260861","url":null,"abstract":"Transparent conducting fluorine-doped tin oxide (FTO) thin films were prepared onto glass at low substrate temperature by an advanced spray pyrolysis technique, with stannic chloride and ammonium fluoride as precursors. The films were grown at different substrate temperatures varied in the range of 250–340°C. The effect of the substrate temperature on the structural, morphological, and hydrogen sulphide (H2S) gas sensing properties of the films has been investigated. XRD studies confirm tetragonal crystal structure of the films and all the films are found to be polycrystalline in nature. The FTO film prepared at 250°C exhibits the maximum sensitivity (∼ 10 %) at 250°C operating temperature. Further, the effect of palladium sensitization on the H2S sensing properties of the 250°C sample has been studied and an enhanced sensing response was obtained.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"37 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72679775","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":"Structural, magnetic and dielectric properties in Cu substituted Ni-Zn ferrite for sensors applications","authors":"P. Das, G. Singh","doi":"10.1109/ISPTS.2012.6260868","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260868","url":null,"abstract":"Copper substituted NiZn ferrite powder of a chemical formula Ni<inf>0.5−x</inf>Cu<inf>x</inf>Zn<inf>0.5</inf>Fe<inf>2</inf>O<inf>4</inf> (0≤ × ≤0.3) is synthesized by auto combustion process at 350°C followed by the calcination at 600, 900 and 1000°C for 2h. The derived powder shows well distinct total seven peaks of cubic spinel structure with space group Fdℨ̅m. The considerable increments in the lattice constant and the reduction in an average crystallite sizes are observed with increasing the Cu content. At the optimal condition of x = 0.1, the crystallite size as small as 26 nm and the coercivity as high as 158 Oe is obtained in samples calcined at 600°C. The dielectric (έ, ε″, and tanδ) analyses show the frequency sensitive behavior in the low frequency region and the frequency independent characteristics at high frequency side due to the Maxwell-Wagner type of interfacial polarization and also due to hopping of charges between Fe²⁺ ↔Fe3⁺. The highest dielectric constant ∼ 48 at 1 kHz and the lowest dielectric loss ∼ 0.06 at 4 MHz are obtained in the studied frequency range, whereas the maximum frequency sensing response ∼ 92% is observed at 4 MHz in same sample.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"3 1","pages":"29-32"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74351939","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":"Advances and challenges in NDE sensors","authors":"M. Shyamsunder","doi":"10.1109/ISPTS.2012.6260939","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260939","url":null,"abstract":"The industrial world continues to demand greater efficiency and effectiveness from the inspection processes using Nondestructive Evaluation (NDE) techniques. NDE sensors form the heart of any inspection system and could be one of the most important contributor to effective and reliable inspections in the industrial world. One important and frequently adopted approach by researchers in the NDE community is to innovate in the NDE sensors area. The industrial world of engineering structures and components is reasonably complex and extremely broad in terms of materials used, shapes, designs, defects to be detected, operating conditions, etc. The reasons for focusing on the sensors side is multifold; most important being the fact that in the entire system, it is the closest in proximity to the object being inspected and thus can contribute significantly. In addition many of the advances taking place in a host of enabling technologies such as electronics, communication, signal processing, computers, manufacturing, modeling/simulation tools, etc, have accelerated and motivated the design and development of new NDE sensors which can meet today's tough demands.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"32 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74566555","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":"Effect of RE3+ (RE = Eu, Sm) ion doping on dielectric properties of nano-wollastonite synthesized by combustion method","authors":"Sandhya Kulkarni, R. Damle, B. Nagabhushana, Narsimha Parvatikar","doi":"10.1109/ISPTS.2012.6260954","DOIUrl":"https://doi.org/10.1109/ISPTS.2012.6260954","url":null,"abstract":"The nano-ceramic perovskite oxide Wollastonite (β-CaSiO<inf>3</inf>) doped with rare earth (RE) ions Eu³⁺and Sm³⁺ were synthesized by Low temperature solution combustion method, characterized by Powder XRD (X-ray Diffraction), FTIR(Fourier Transform Infrared Spectroscopy). The XRD studies revealed that there is a phase transition from β- to α-phase on doping with rare earth ions. The FTIR results showed that there is a dramatic stress on the Si-O bonds due to the effect produced by means of A-site vacancies resulted, on substitution of Eu³⁺ and Sm³⁺ in Ca2+ site. The particle size was estimated by TEM (Transmission Electron Microscopy), it was compared with the size determined by Scherrer's formula. The SEM (Scanning Electron Microscopy) of β-CaSiO<inf>3</inf> shows that it is a porous material containing agglomerated nanoparticles. The dielectric measurements for lower frequencies (10² Hz–10⁶ Hz) were performed for the undoped as well as doped with Eu³⁺ (3 mole %) and Sm³⁺(4 mole %). The measurements revealed that the undoped β-CaSiO<inf>3</inf> shows high dielectric constant (54) and low dielectric loss (0.03) and low value of dielectric conductivity (of the order of 10–7mho cm) at 1MHz.frequency. However the dielectric constant (66) increased and dielectric loss (0.008) decreased by doping with the rare earth elements of atomic radii smaller than that of Calcium and an unusual observation is that the dielectric constant, dielectric loss and dielectric conductivity become equalized when β-CaSiO<inf>3</inf> was doped with 3 mole% Eu³⁺ and 4 mole% Sm³⁺.","PeriodicalId":6431,"journal":{"name":"2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1)","volume":"109 1","pages":"305-310"},"PeriodicalIF":0.0,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73679445","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}