The electrical conductivity of metal-oxide gas sensors depends on the gas atmosphere and on the temperature of the sensor. Temperature control systems for gas sensors were developed as a conventional PlD-controller. Problems appear in cases of hard disturbances (i.e. rough gas flows) to fix a temperature point that has its origin in the high non-linearity of the controlled system. A new concept...

Wireless Sensor Networks (WSN) have recently been applied in various monitoring applications including hazardous gases detection. However, being a major power consumer of a sensor node, off-the-shelf gas sensors significantly constrain its lifetime. In this paper we present a WSN for hazardous gases detection with a special focus on the power consumption of the sensor node. The sensor node is d...

In the present work, a detailed theoretical analysis of a surface plasmon resonance (SPR)-based fiber optic sensor with an alternating dielectric multilayer system is carried out. The dielectric system consists of silica and titanium oxide layers. The effect of critical design parameters on the sensor’s sensitivity and detection accuracy is studied. The results are explained in terms of appropr...

Electronic noses utilizes an array of chemical sensors of different specificities which responds to the volatile organic compounds present in the gases. The use of electronic chemical sensors in an array design with coupled signal conditioning and appropriate pattern recognition system is capable of identifying complex odours.Such an artificial gas sensing system is called 'electronic nose'. Th...

Ceramic gas sensors used for measuring ambient air quality have features suitable for practical applications such as healthcare and air quality management, but have a major drawback-large power consumption to preheat the sensor for accurate measurements. In this paper; the adaptive preheating duration control (APC) method is proposed to reduce the power consumption of ambient air quality sensor...

Unpublished AIChE shall not be responsible for statements or opinions contained in papers or printed in its publications. Abstract This paper describes a novel calorimeter applicable for the simultaneous measurement of adsorption isotherms and the corresponding heats of adsorption. The calorimeter is based on a new metrological principle as a gas surrounding the adsorption vessel containing the...

Thesis for the degree of Doctor of Technology to be presented with due permission for public examination and debate in Abstract Numerical simulation models for capacitive, micromechanical inertial sensors are presented. These dynamic, nonlinear models include the contributions of electrical, mechanical, and uidic energy domains by means of electrical equivalent circuits consisting of lumped, fr...

Using the sensor technology as the core, combining with the A/D technology, pattern recognition technology and other technologies, we have designed a new type of gas detection system. Gases are detected through BP neural network algorithm. The design of the system, the establishment of BP neural network and the improvement of its algorithm are given. The fusion technology of multi-sensor is exp...