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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...
During the recent years, capacitor voltage transformers (CVT) gradually replace the electromagnetic voltage transformers (EVT) in high-voltage measurements. Because transient response of the CVT is worse and there are other defects, recently much research work has been focused on improving CVT. In this paper CVT by parallel connecting capacitances with resistances is put forward. Then its principle...
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...
The complex permittivity of a biological medium used for stem cell culture has been measured from 1 GHz to 20 GHz for the first time. Results for the medium are presented here in comparison with those of distilled water. The determination of spectra for the real and imaginary parts of complex dielectric permittivity of the biological medium will help us further to understand the mechanism of absorption...
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...
An advanced automated calibration technique for a trimming inaccuracy (calibration tolerance) of low-cost quartz resonators that are using in the Universal Sensors and Transducers Interface (USTI) integrated circuits for precision frequency (period)-to-digital conversion is described in the paper. It was shown that such technique can be used also for reducing an error due to a quartz crystal aging...
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...
The analysis of physical and chemical characteristics of materials (composite or not) via the determination of change in the effective atomic number (Zeff) can be performed by measuring the relation between the intensities of gamma-rays under coherent (Rayleigh) and inelastic (Compton) scattering. The creation of methods for no-contact, non destructive control of Zeff and density rho of localized...
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...
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...
On-line measurement of physical parameters of solution means a great deal in the osmotic dehydration process of food. Ternary solution with NaCl and sucrose is widely employed in this process. This study aims at reconstructing concentrations of two components and estimating density, viscosity of this ternary solution with multifunctional sensing technique in which the multifunctional sensor was previously...
A novel planar interdigital sensor based sensing and instrumentation system has been developed for detection of dangerous contaminated chemicals in seafood. Three novel interdigital sensors have been designed and fabricated. The sensors were designed with different configurations and analyses of all sensors were conducted from the experiments in order to select the best sensor for further analysis...
There are numerous applications for the use of leadacid batteries: automotive applications, telecommunications, UPS, remote-area power-supply systems, etc. Modern energy-storage applications require higher reliability than has been demanded in the past; in addition, systems have been developed for monitoring and managing the batteries so as to achieve duty in service. For determination of battery...
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...
Due to its restricted usage and accuracy in measuring extremely short interval of time, TDC (time to digital converter) embedded measurement devices are relatively expansive. Even if new applications are being developed in daily life as well as in industry, the cost condition of TDC based measurement systems needs to be improved. To reduce the deployment cost on a commercial scale, analogue interpolation...
A technique was described in which a multi-wavelength pyrometer was used to measure a sample temperature with its short wavelength based on the reflectivity measurement and then to obtain the normal spectral emissivities at longer wavelengths. The normal spectral emisivities of a roughened and slightly oxidized steel plate were measured with this technique at four wavelengths. The standard relative...
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...
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