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This paper deals with low-invasive temperature monitoring inside freeze dryers. During lyophilization, both the temperature of the freeze-dryer shelves and the temperature of the products have to be measured in order to control the process and to guarantee the product quality. In addition, temperature measurements are essential to obtain reliable information during the development of the freeze-drying...
Pressure transducer is generally calibrated in room temperature. But in many applications, pressure transducer may be required to work in a very low temperature down to -40degC. Pressure measurement will be affected by extreme temperature in those cases. For example, those real experiments in cold area, transducer and its measurement system often work at very low temperatures. The paper describes...
Present work proposes a novel, low cost non-contact temperature measurement technique using consumer grade digital still camera. The images of various visible heat sources are captured. Using colour image segmentation, source zones are identified. The actual temperature is measured by placing a miniature thermocouple in each zone. The colour temperature correlation is established by applying various...
An electronic system based on a microcontroller architecture devoted to interfacing an Ultra Low Power (ULP) Metal OXide (MOX) gas sensor is presented. The circuit controls the operating temperature and manages the acquired data. A Pulse Width Modulation (PWM) signal with variable duty cycle is used to provide power to the heating resistor in order to set the desired operating temperature. The heating...
Nanostructured copper(II) oxide film was deposited using reactive DC magnetron sputtering. It has been characterized using XRD, EDAX, XPS, and FESEM. The grain size of copper oxide film was found to be 40-65 nm with size distribution. The entire study was divided into two parts. In the first part, the film has been studied for its response to alcohol at different temperatures to find the optimum sensing...
Mobile agent system provides us with a new way to realize distributed collaborative information processing in sensor networks. In this paper, we present a middleware to realize mobile-agent-based data fusion on wireless sensor networks nodes, which is implemented entirely in TinyOS and has been tested on TelosB motes. It consists of two parts. One is the strategy for the serialization of algorithm...
This paper deals with the development and the metrological management of an acquisition system that has been developed for monitoring an experimental photovoltaic (PV) plant. The main targets are the comparison among the performance of different photovoltaic technologies and the verification of the nominal specifications of the employed PV modules. For these reasons, the traceability of the measurements...
A wireless sensing network Bluetooth enabled was designed and implemented for continuous monitoring of indoor humidity and temperature conditions as well as to detect pollutant gases and vapors. The novelty of the work is related to the development of an embedded software using Java2ME technology for a smart phone that materializes a user friendly HMI. Two mobile software modules assure sensor nodes...
This paper provides details of the potential designs of a high-pressure high-temperature (HPHT) sensor which forms part of a highly accurate optical measurement system for permanent monitoring of pressure and temperature in oil wells. The proposed sensors are of a hybrid construction and comprise two different types of spectrally encoded transducers - a fiber Bragg grating (FBG) and a Fabry-Perot...
A real-time electronic nose system is designed to analyze methane (CH4), hydrogen (H2) and their mixtures, the main combustible gases in the environment. The system is based on a single chip for acquiring measurement data from a gas sensor array. Four Fe2O3 gas sensors with little humidity effect are employed in the gas sensor array. A principal component regression (PCR) method is applied to process...
Capacitive fluidic inclinometers provide an interesting alternative to pendulum based sensor principles for inclination measurement in harsh industrial environments, as mechanical problems due to the large pendulum are avoided. However, the performance of these sensors is strongly dictated by fluid properties. A common means to cope with the non ideal effects of the fluid in order to achieve high...
This paper describes the realization of a temperature sensor based on plasma sputtered thermocouples. The thermocouples are realized in the vacuum with quite pure materials, negligible oxydation and with low contamination thus enabling accurate measurements and are made inert by means of a thin coating of tetraethoxysilane (TEOS) that seals them. The thermocouples have an overall thickness of few...
A wireless sensor network comprises of several nodes (also called motes). A mote communicates with other nodes based on the information collected through the sensor module attached with multiple sensors, e.g., accelerometer, pressure, temperature and humidity sensors. It is important that the sensors provide accurate readout of the physical quantity that they sense, especially when the motes are operated...
In this paper we design and implement a surveillance system based on an embedded system with multiple Pyroelectric Infrared sensors (PIR) to enhance the reliability. The sensing reliability of a PIR sensor decreases when the distance from the object has increased or the ambient temperature has risen. Our design integrates multiple sensors to construct a sensor group and count their states by using...
The paper presents the interface designed for wireless data and power transmission. The interface operation idea was tested using build up hardware and software. The sample construction of the temperature sensor embedded with this type interface was designed. Measurements show that the sensor can be wirelessly supplied with energy and is capable to sent data (temperature readings) in 5 cm distance...
Temperature measurement and monitoring plays a very important role in cold chain of blood. This paper describes a Web-based real-time monitoring system on cold chain of blood. The objective is split into three different tasks. First, wireless sensors send sensing data to database server through two types of networks: 1) For outdoor network, wireless sensors on mobile devices send data through the...
A temperature sensor that could be interrogated contactless represents an attractive solution for measurements into harsh environments such as in presence of high temperatures that do not permit the correct working of electronics. This paper discusses a telemetric system consisting of two coupled planar inductors, which constitute a coupled transformer with the primary one connected to the measurement...
Thermocouple is a very popular and effective sensor for temperature measurement. But how to eliminate the interference of the temperature of cold junction is always a problem. A method based on recursive B-spline least-squares is proposed as a solution. The method establishes two models to convert the cold junction temperature to electromotive force (EMF) and the hot junction EMF to temperature respectively...
A micro-array method using Hall sensors was proposed in previous research by the authors. That array method allowed a two-dimensional magnetic field measurement with high spatial resolution using simplified connections. A wide range of magnetic fields could be measured quantitatively with high spatial resolution. This paper proposes a nondestructive testing (NDT) method using a magnetic camera with...
Sensors are typically designed to produce outputs related to the instantaneous value of the quantity of interest; however situations exist where an output related to the total, cumulative or 'integral' exposure to the quantity of interest is required. This paper describes a low-cost optical sensor for the monitoring of the total exposure to sulphide vapors exploiting a non-reversible chemical reaction...
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