In recent years optical waveguide sensors have been used for applications as biosensors and chemical sensors. Often the fluidic element of the sensor has a large working volume (mul) and full device integration is not...
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In recent years optical waveguide sensors have been used for applications as biosensors and chemical sensors. Often the fluidic element of the sensor has a large working volume (mul) and full device integration is not undertaken. We look at a number of fabrication routes available to integrate microfluidic and optical detection components to achieve a fully integrated microsystem and highlight some of the technical issues arising in different integration strategies. Wafer and chip integration strategies using anodic, thin film and polymer bonding for the fluidic module and the optical sensor were investigated. The integrated microsystem was evaluated for fluidic and optical performance, integration showed no significant impact on performance of either component. The fluidic system presents a nanolitre detection volume offering reduced sample volumes in HPLC applications. Initial optical performance of the integrated structure was carried out using a refractive index measurement system, the Farfield Analight(R) Bio250. (C) 2004 Elsevier B.V. All rights reserved.
Low-cost, disposable, SiO2/Si3N4 chemical field effect transistor (ChemFET) microsensors have been fabricated for pH measurements and adapted to biochemical applications by using polyvinyl alcohol (PVA) enzymatic laye...
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Low-cost, disposable, SiO2/Si3N4 chemical field effect transistor (ChemFET) microsensors have been fabricated for pH measurements and adapted to biochemical applications by using polyvinyl alcohol (PVA) enzymatic layers deposited and patterned either by dip-coating, or spin-coating and photolithographic techniques. Both processes have been compared for the development and optimization of a creatinine-sensitive enzymatic field effect transistor (Creatinine-EnFET). Creatinine detection properties have been characterized in dialysate, demonstrating better properties for the spin-coated PVA enzymatic layers. Thus, creatinine sensitivity has been estimated at approximately 30 mV/pCreatinine on the [10-1000 mumol L-1] concentration range. The microsensor will be used for blood analysis and more precisely for haemodialysis. (C) 2004 Elsevier B.V. All rights reserved.
Low-cost, disposable, SiO2/Si3N4 chemical field effect transistor (ChemFET) microsensors have been fabricated for pH measurements and adapted to biochemical applications by using polyvinyl alcohol (PVA) enzymatic laye...
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Low-cost, disposable, SiO2/Si3N4 chemical field effect transistor (ChemFET) microsensors have been fabricated for pH measurements and adapted to biochemical applications by using polyvinyl alcohol (PVA) enzymatic layers deposited and patterned either by dip-coating, or spin-coating and photolithographic techniques. Both processes have been compared for the development and optimization of a creatinine-sensitive enzymatic field effect transistor (Creatinine-EnFET). Creatinine detection properties have been characterized in dialysate, demonstrating better properties for the spin-coated PVA enzymatic layers. Thus, creatinine sensitivity has been estimated at approximately 30 mV/pCreatinine on the [10-1000 mumol L-1] concentration range. The microsensor will be used for blood analysis and more precisely for haemodialysis. (C) 2004 Elsevier B.V. All rights reserved.
Many environmental problems due to atmospheric pollution have increased the interest for the development of portable multisensor systems (electronic noses) for gas detection applications. In this way, we use a metal o...
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Many environmental problems due to atmospheric pollution have increased the interest for the development of portable multisensor systems (electronic noses) for gas detection applications. In this way, we use a metal oxide sensor array dedicated to two industrial and environmental gases, alone or mixed. These gases have an antagonistic influence on the sensor layers, reducing (H2S) or oxidising (NO2). So the sensor time-responses present different behaviour according to the (low or high) concentration of the gases. In addition, humidity presents a notable reducing influence. We present in this work a new method to discriminate successfully the concentration of the atmospheric components, in three different reference atmospheres taking into account humidity and carbon dioxide. (C) 2004 Elsevier B.V. All rights reserved.
Ion sensitive field effect transistor (ISFET) microsensors including a SiO2/Si3N4 pH-sensitive gate structure and a titanium/gold pseudo-electrode have been used to detect the activity of the Lactobacillus Acidophilus...
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Ion sensitive field effect transistor (ISFET) microsensors including a SiO2/Si3N4 pH-sensitive gate structure and a titanium/gold pseudo-electrode have been used to detect the activity of the Lactobacillus Acidophilus bacterium. The first results have shown that such applications require high bacterial concentrations and, therefore, small analysis volumes. Thus, the pH-ISFETs have been adapted by fabricating micro-tanks from plexiglas or poly-dimethylsiloxane (PDMS). Bacterial detection over several minutes has been made possible by monitoring pH variations. This will allow ChemFET microsensors to be developed for bacteriological applications and for clinical analysis in particular. (C) 2004 Elsevier B.V. All rights reserved.
Many environmental problems due to atmospheric pollution have increased the interest for the development of portable multisensor systems (electronic noses) for gas detection applications. In this way, we use a metal o...
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Many environmental problems due to atmospheric pollution have increased the interest for the development of portable multisensor systems (electronic noses) for gas detection applications. In this way, we use a metal oxide sensor array dedicated to two industrial and environmental gases, alone or mixed. These gases have an antagonistic influence on the sensor layers, reducing (H2S) or oxidising (NO2). So the sensor time-responses present different behaviour according to the (low or high) concentration of the gases. In addition, humidity presents a notable reducing influence. We present in this work a new method to discriminate successfully the concentration of the atmospheric components, in three different reference atmospheres taking into account humidity and carbon dioxide. (C) 2004 Elsevier B.V. All rights reserved.
The advent of GMR magnetic sensors and GMR sensorarrays with frequency‐independent sensitivity offers improvements in speed, depth, and resolution in eddy‐current testing. arrays of GMR magnetic sensors allow rapid...
The advent of GMR magnetic sensors and GMR sensorarrays with frequency‐independent sensitivity offers improvements in speed, depth, and resolution in eddy‐current testing. arrays of GMR magnetic sensors allow rapid scanning of an area for defects in a single pass. The small size and low power consumption of these solid‐state magnetic sensors enable the fabrication of compact arrays of sensors on circuit boards and even on‐chip sensorarrays. arrays have been fabricated with sensor spacing as small as 5 micrometers when fine resolution is required. GMR sensor elements can be deposited on active silicon substrates facilitating on‐chip signal processing and multiplexing. This integration simplifies the sensor/signal‐processing interface, minimizes the number of leads, and can reduce the effect of noise. This paper will discuss the technology of fabricating arrays on GMR sensors, especially on‐chip arrays. Integrated sensorarrays with on‐chip signal processing and multiplexing will be described. Finally, some applications of arrays to crack and corrosion detection will be discussed.
In recent years optical waveguide sensors have been used for applications as biosensors and chemical sensors. Often the fluidic element of the sensor has a large working volume (mul) and full device integration is not...
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In recent years optical waveguide sensors have been used for applications as biosensors and chemical sensors. Often the fluidic element of the sensor has a large working volume (mul) and full device integration is not undertaken. We look at a number of fabrication routes available to integrate microfluidic and optical detection components to achieve a fully integrated microsystem and highlight some of the technical issues arising in different integration strategies. Wafer and chip integration strategies using anodic, thin film and polymer bonding for the fluidic module and the optical sensor were investigated. The integrated microsystem was evaluated for fluidic and optical performance, integration showed no significant impact on performance of either component. The fluidic system presents a nanolitre detection volume offering reduced sample volumes in HPLC applications. Initial optical performance of the integrated structure was carried out using a refractive index measurement system, the Farfield Analight(R) Bio250. (C) 2004 Elsevier B.V. All rights reserved.
The primary mission of the National Energy Technology Laboratory (NETL) is to assure U.S. fossil energy resources can meet increasing demand for affordable energy without compromising the quality of life for future ge...
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ISBN:
(纸本)0780386922
The primary mission of the National Energy Technology Laboratory (NETL) is to assure U.S. fossil energy resources can meet increasing demand for affordable energy without compromising the quality of life for future generations of Americans. In this mission, NETL has historically focused on the development of advanced technologies as part of or in support of larger programs, such as the Clean Coal Power Initiative, FutureGen, the solidstate Energy Conversion Alliance (SECA), and the Turbines program. Power generation research at NETL covers many areas, including coal and oil gasification and gas cleanup, turbine combustion, high temperature fuel cells, internal combustion engines for stationary power, and hybrid fuel-cell turbine power systems. Advancement in these areas either requires or would benefit from advances in sensor technology for harsh environments. This presentation will discuss opportunities for sensors in modern fossil-fuel based power generation, challenges posed by the operating environments, and summarize research at NETL on a sensor for in-situ monitoring of gas turbine combustors.
We have been developing custom multi channel mixed signal readout integrated circuits (ICs) for advanced position sensitive solid-state radiation detector arrays for applications ranging from X-ray astronomy and medic...
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We have been developing custom multi channel mixed signal readout integrated circuits (ICs) for advanced position sensitive solid-state radiation detector arrays for applications ranging from X-ray astronomy and medical imaging to security and industrial inspection. Readout ICs are an integral part of position-sensitive semiconductor detectors for X-ray, gamma-ray and charged particle imaging. Different detector applications require custom IC, which is typically designed for a specific detector array. Therefore, it is important to develop generic ICs to meet a range of applications in different complementing fields. To achieve this aim NOVA has been developing generic ICs for different fields of applications, which embodies versatile and adaptable functions as well as selectable features. An overview of generic ICs developed at NOVA is presented here. Each chip described targets a complementing application field with versatile functions and features.
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