To investigate the effect of aging at 580 °C in wet air (humid aging) on the oxygen adsorption on the surface of SnO₂ particles, the electric properties and the sensor response to hydrogen in dry and humid atmospheres for SnO₂ resistive-type gas sensors were evaluated. The electric resistance in dry and wet atmospheres at 350 °C was strongly increased by humid aging. From the results of oxygen ...

The broad objectives of this work are the testing, deployment and refinement of spectroscopic sensors for monitoring the distributions of reactive chemicals in seawater. The analytes of special interest in this work are iron, copper, nitrate, nitrite, ammonia, phosphate and CO2-system variables (total inorganic carbon, total alkalinity, CO2 partial pressure and pH). The desired accuracy of the ...

The gas sensing properties of resistive gas sensors of BaFe0.7Ta0.3O3−δ (BFT30) prepared by the socalled aerosol deposition method, a method to manufacture dense ceramic films at room temperature, were investigated. The electrical response of the films was investigated first under various oxygen concentrations and in a wide temperature range between 350 and 900 C. Between 700 and 900 C, the con...

In this work, the potential of auto-ignition of heavy oil during in-situ combustion (ISC) process was studied. Kinetic studies were carried out using Thermo Gravimetric Analyzer (TGA), Differential Scanning Calorimetry (DSC) and Accelerating Rate Calorimetric (ARC) techniques. Effects of oxygen partial pressure, reservoir pressure and clay on auto ignition condition were investigated on a n...

This paper presents design and assembly of mixed electronic circuitry for measured signal processing of the capacitive difference pressure sensor, as well as analysis of the obtained results. The smart pressure sensor provides values of measured pressure via 4 20 mA current loop output. The loop current is also used for sensor circuitry supplying. This means that current consumption of the whol...

This paper presents the simulation, fabrication and characterization of a microFET (field effect transistor) pressure sensor with readout circuits. The pressure sensorincludes 16 sensing cells in parallel. Each sensing cell that is circular shape is composed ofan MOS (metal oxide semiconductor) and a suspended membrane, which the suspendedmembrane is the movable gate of the MOS. The CoventorWar...

Bulk micromachined piezoresistive pressure sensor was designed, fabricated, packaged, and tested at RIT laboratory facility. Every aspect of the fabrication is studied thoroughly and used as an educational tool in better understanding the fabrication of MEMs devices.

BACKGROUND The measurement of CO(2) partial pressure (PCO(2)) is of great importance. Former systems of transcutaneous capnometry combining the measurement of oxygen partial pressure (PO(2)) and PCO(2) had their limitations due to skin irritations caused by the heating-up of the sensor and a short application time of 4 h. OBJECTIVES To evaluate for the first time combined monitoring of transc...

Background: The measurement of CO 2 partial pressure (P CO 2 ) is of great importance. Former systems of transcutaneous capnometry combining the measurement of oxygen partial pressure (P O 2 ) and P CO 2 had their limitations due to skin irritations caused by the heating-up of the sensor and a short application time of 4 h. Objectives: To evaluate for the first time combined monitoring of trans...