Download or read book Ion Based High Temperature Pressure Sensor written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high speed, durable, ion probe based pressure sensor is being investigated for use in pulse detonation engines. The environment encountered in such engines necessitates high temperature and durable (vibration resistant) devices. Traditional pressure sensors can be used, however thermal insulating materials must be used to protect the diaphragm. These materials dampen and reduce the pressure wave allowing for qualitative results only. An alternative pressure sensing method is investigated for pressures behind a hydrocarbon flame in the pulse detonation engine. Hydrocarbon flames generate ions that are quenched by collisions with other species and walls. As the collision rate is a function of pressure, so too is the ion quench rate. The ion decay rate is measured using an ion probe well suited for the high temperature flow, inexpensive, and has no moving parts. Similar systems have been used to determine equivalence ratio in automobile engines. Further, wave speed may be determined through the use of multiple sensors. This investigation builds upon these capabilities to examine the quantitative pressures. In the current design, the ion probe acts as a charged capacitor. When an ionized field nears the probe, the electrical circuit is connected. The electrode on the probe discharges through the ionized field to a grounded plate. The rate of discharge indicates the strength of the ionized field which decays according to pressure. The experimental setup for this investigation and preliminary findings are presented here. Correlations between the decay rate and pressure are to be determined and compared to theory.
Download or read book Ion Based Pressure Sensor for Pulse Detonation Engines written by Jeffrey S. Zdenek and published by . This book was released on 2004-03 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high speed, durable, ion probe based pressure sensor is being investigated for use in pulse detonation engines. Traditional pressure sensors are ill suited for the high temperature and vibratory environment encountered in such engines. An alternative transient pressure sensing method is investigated for pressures behind a hydrocarbon flame. These flames generate ions that are quenched by collisions as a function of pressure. An experiment was devised to correlate the ion decay rate with the pressure using an ion probe well suited for the flow. A correlation has been established showing the ion decay rate is a function of pressure. Additional investigation is required even though the ion probe remains a viable alternative method for measuring pressure.
Download or read book A High Temperature Pressure Sensor Based on Magnetic Coupling and Silicon Wafer Bonding written by Deguang Zhu and published by . This book was released on 1995 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book IPRES written by Ruya Li and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, wearable sensing is an attractive focus of research in the sensing field. Flexible sensors thrive along with the development of wearable technologies because they provide unique features for wearable applications through their compliance and comfort. Resistive, parallel-plate capacitive, and piezoelective based flexible pressure sensors have been investigated over the years for flexible pressure sensing. However, the intrinsic defects of these sensors prevent their application in medical devices, as most applications require high sensitivity, accuracy, and a fast mechanical response. In this dissertation, several types of novel, ion-based pressure sensing devices, referred to as iontronic pressure sensors have been developed with ultrahigh sensitivity, fast mechanical responses, and high flexibility for hemodynamic monitoring applications. Using ultrahigh electrical double layer interfacial capacitance and ionic material resistance, highly sensitive pressure sensing devices are designed and fabricated. Different working modes, resistive and capacitive, are tuned to fit different use scenarios. Parameters that influence device performance, such as sensitivity and mechanical response, are modelled and investigated. A microfluidic film based pressure sensing device that can achieve 0.45 kPa−1 sensitivity within a response time of milliseconds is designed and fabricated for large-area pressure distribution mapping in transparent and flexible package. A novel ionic gel material is implemented with improved device performance using the electrical double layer capacitive mode for sensing. An ionic gel droplet based pressure sensor can achieve a sensitivity of 0.2 nF/mmHg and measures pressure distribution in an array configuration. Further integration of the novel ionic gel within textile generates a new type of ionic pressure sensor that can achieve pressure sensing in all-fabric structures. This novel all-fabric ionic pressure sensor has 0.62 nF/mmHg sensitivity and remains stable when placed on a curved surface with radii decreased to 25 mm. Well-developed iontronic pressure sensors are applied in non-invasive pulse waveform monitoring and chronic venous disorder management. In non-invasive pulse waveform monitoring application, the microfluidic based flexible pressure sensor captures radial arterial pulse waveforms with a matrix configuration when worn on the wrist. Hemodynamic parameters can be calculated based on the waveform acquired to indicate arterial condition of the tested individual. In chronic venous disorder management application, an ionic droplet pressure sensing matrix is integrated into a commercial compression garment to monitor pressure distribution on limbs in a wireless and real-time manner. The iontronic pressure sensors presented offer a highly-transformative solution for wearable health monitoring applications which may benefit patients and clinicians in disease diagnosis, treatment, and rehabilitation.
Download or read book Development of Dynamic Pressure Sensor for High Temperature Applications written by Alfin Leo and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pressure Sensors written by Duane Tandeske and published by CRC Press. This book was released on 1990-11-19 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical handbook provides the knowledge needed to specify and apply the best piezoresistive pressure sensors to interface with microprocessors and computers. Eliminating the details of semiconductor physics, it clarifies the three kinds of pressure measurement, explains silicon sensor design
Download or read book High Temperature Fiber optic Pressure Sensor with Built in Temperature Sensor written by Satoshi Hachiya and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fabrication of High Temperature Silicon Pressure Sensors written by Suneat Pranonsatit and published by . This book was released on 2000 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor based Sensors written by Fan Ren and published by World Scientific. This book was released on 2016-08-26 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive summary of the status of emerging sensor technologies and provides a framework for future advances in the field. Chemical sensors have gained in importance in the past decade for applications that include homeland security, medical and environmental monitoring and also food safety. A desirable goal is the ability to simultaneously analyze a wide variety of environmental and biological gases and liquids in the field and to be able to selectively detect a target analyte with high specificity and sensitivity. The goal is to realize real-time, portable and inexpensive chemical and biological sensors and to use these as monitors for handheld gas, environmental pollutant, exhaled breath, saliva, urine, or blood, with wireless capability.In the medical area, frequent screening can catch the early development of diseases, reduce the suffering of patients due to late diagnoses, and lower the medical cost. For example, a 96% survival rate has been predicted in breast cancer patients if the frequency of screening is every three months. This frequency cannot be achieved with current methods of mammography due to high cost to the patient and invasiveness (radiation). In the area of detection of medical biomarkers, many different methods, including enzyme-linked immunsorbent assay (ELISA), particle-based flow cytometric assays, electrochemical measurements based on impedance and capacitance, electrical measurement of microcantilever resonant frequency change, and conductance measurement of semiconductor nanostructures, gas chromatography (GC), ion chromatography, high density peptide arrays, laser scanning quantitiative analysis, chemiluminescence, selected ion flow tube (SIFT), nanomechanical cantilevers, bead-based suspension microarrays, magnetic biosensors and mass spectrometry (MS) have been employed. Depending on the sample condition, these methods may show variable results in terms of sensitivity for some applications and may not meet the requirements for a handheld biosensor.
Download or read book Development of a High Temperature Silicon Carbide Capacitive Pressure Sensor System Based on a Clapp type Oscillator Circuit written by Maximilian C Scardelletti and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, the development of a packaged silicon carbide (SiC) based MEMS capacitive pressure sensor system that is designed to monitor the pressure of a conventional gas turbofan engine is described. The electronic circuit of the pressure sensor system is based on a Clapp-type oscillator that includes a 6H-SiC MESFET, a SiCN MEMS-based capacitive pressure sensor, titanate MIM capacitors, wirewound inductors, and thick film resistors. The capacitive pressure sensor is incorporated in the LC tank circuit of the oscillator so that a pressure-induced change in capacitance causes a change in the resonant frequency of the oscillator. The MESFET is used to induce oscillation. Individual passive components were evaluated at high temperature to assess their utility in an integrated system. Both wireless and wired variants of the pressure sensor systems for use at high temperature were developed. In developing the final packaged device, several prototype designs of the Clapp-type oscillator circuit that incorporate wireless capability were explored. Prototype circuits with slot-ring and chip antennas operating between 700 MHz and 1 GHz exhibited a maximum operating temperature of 250¿C, limited by the low gain of the MESFET at these frequencies. Prototype circuits operating at 30 and 90 MHz that utilize large spiral inductors in the Clapp oscillator as the radiating element extended stable operation to 470°C. Several wireless pressure sensor prototypes based on the Clapp oscillator circuit were developed. A prototype incorporating a polysilicon capacitive pressure sensor and a spiral inductor exhibited stable operation up to 300°C. A second prototype that used a SiCN capacitive pressure sensor functioned at temperatures up to 400°C. A third prototype based on the 2nd prototype but incorporating a compact, directional chip antenna had a maximum operating temperature of 300oC, limited by the antenna. Based on size restrictions, the packaged system utilized a wired configuration. This prototype operates reliably from 0 to 350 psi and from 25 to 540°C, with a sensitivity of 6.8x10-2 MHz/psi and negligible difference in frequency response. The packaged sensor passed standard benchtop temperature, pressure and vibration acceptance tests required prior to any future test on a flight worthy engine.
Download or read book Fiber Optic Microbend Pressure Sensor Designed for High temperature Applications written by Robert J. Ferina and published by . This book was released on 1990 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automotive Sensors written by John Turner and published by Momentum Press. This book was released on 2009 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will help engineers, technicians, and designers to better understand a wide range of sensors, from those based on piezoelectric phenomena through those for thermal and flow measurement to the directional sensors that can inform the driver of his orientation on the road. Author John Turner, concludes his book with future trends in use of telematic sensing systems for traffic control and traffic automation.
Download or read book Laser induced Graphene written by Ruquan Ye and published by . This book was released on 2020-11-30 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: LIG is a revolutionary technique that uses a common CO2 infrared laser scriber, like the one used in any machine shop, for the direct conversion of polymers into porous graphene under ambient conditions. This technique combines the preparation and patterning of 3D graphene in a single step, without the use of wet chemicals. The ease in the structural engineering and excellent mechanical properties of the 3D graphene obtained have made LIG a versatile technique for applications across many fields. This book compiles cutting-edge research on LIG by different research groups all over the world. It discusses the strategies that have been developed to synthesize and engineer graphene, including controlling its properties such as porosity, composition, and surface characteristics. The authors are pioneers in the discovery and development of LIG and the book will appeal to anyone involved in nanotechnology, chemistry, environmental sciences, and device development, especially those with an interest in the synthesis and applications of graphene-based materials.
Download or read book Characterization and Fabrication of alpha 6H SiC as a Piezoresistive Pressure Sensor for High Temperature Applications written by Robert Sylvester Okojie and published by . This book was released on 1996 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silicon Carbide Pressure Sensors for High Temperature Applications written by Sheng Jin and published by . This book was released on 2011 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron Paramagnetic Resonance in Modern Carbon Based Nanomaterials written by Dariya Savchenko and published by Bentham Science Publishers. This book was released on 2018-06-05 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents information about several topics in the field of electron paramagnetic resonance (EPR) study of carbon-containing nanomaterials. It introduces the reader to an array of experimental and theoretical approaches for the analysis of paramagnetic centers (dangling bonds, interface defects, vacancies, and impurities) usually observed in modern carbon-containing materials such as nanographites, graphene, disordered onion-like carbon nanospheres (DOLCNS), single-walled carbon nanotubes (SWCNTs), multi-walled carbon nanotubes (MWCNT), graphene oxide (GO), reduced graphene oxide (rGO), nanodiamonds, silicon carbonitride (SiCN) and silicon carbide (SiC) based composites and thin films. In particular, the book describes in detail: • The fundamentals of EPR spectroscopy and its application to the carbon-containing materials; • The resolution of the EPR signals from different species in carbon materials; • EPR characterization of spin dynamics in carbon nanomaterials; • Magnetic properties of DWCNTs and MWCNTs polymer composites; • EPR investigations on GO, rGO and CNTs with different chemical functionalities; • EPR spectroscopy of semiconducting SWCNTs thin films and their transistors; • In-situ EPR investigations of the oxygenation processes in coal and graphene materials; • The two-temperature EPR measurement method applied to carbonaceous solids; • Characterization of impurities in nanodiamonds and SiC nanomaterials and related size effects by CW and pulse EPR techniques; • Application of multifrequency EPR to the study of paramagnetic defects in a-Si1-xCx:H thin films and a-SiCxNy based composites. This volume is a useful guide for researchers interested in the EPR study of paramagnetic centers in the carbon-containing thin films, nanomaterials, ceramics, etc. It is also a valuable teaching tool at graduate and postgraduate levels for advanced courses in analytical chemistry, applied sciences and spectroscopy.
Download or read book A High temperature Pressure Sensor Utilizing Linear Voltage Differential Transformer LVDT and Silicon Wafer to wafer Fusion Bonding Technologies written by Robert Sylvester Okojie and published by . This book was released on 1993 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
