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Il-Bum Kwon, Chi-Yeop Kim, Dae-Cheol Seo, Hyo-Chang Hwang
MULTIPLEXED FIBER OPTIC OTDR SENSORS FOR MONITORING OF SOIL SLIDING

Fiber optic optical time domain reflectometry (OTDR) sensors are suitable to apply the distributed measurement by multiplexing configuration. OTDR sensor system with displacement sensors has been developed to monitor slope stability in soil layers. The displacement was determined from the difference between the reflected signal of the sensing optical connector and the signal of the reference optical connector. Laboratory tests indicate that displacements can be measured with the resolution of several mm and the maximum measurable displacement is about 10 cm, which is enough to apply for the monitoring of soil movements.

P. Gil Morais, C. Almeida Santos, Mariana R. de Carvalho
AUTOMATIC MEASUREMENT SYSTEM FOR GROUND ANCHOR PROOF TESTING

This paper describes the development of a automatic measurement system used to perform ground anchor proof testing. Among other objectives the new system aims at providing fully automatic data collection, data processing and display. A brief overview of anchor testing, measurable quantities and aspects that governed system design are discussed. The main system components are fully described. System validation through measuring chains calibration and field testing results are presented.

Aimé Lay-Ekuakille, Salvatore Gioffreda , Amerigo Trotta
A SMART-AUTOLEARNED ARCHITECTURE AND PROTOCOL FOR VOLATILE ORGANIC COMPOUND MEASUREMENT

Emissions monitoring of volatile organic compounds (VOC) from industrial facilities is complex for both economical, computational and practical reasons. A new wide areas monitoring approach based on "few sensors" wireless network supported by a predictive learning algorithm and an air modeling software can obtain both local and wide VOC estimation.

Leonardo Moreira Leódido, João Nildo de Souza Vianna, Alessandro Borges de Sousa Oliveira, Jean Pierre Damion
A NEW METHODOLOGY FOR CALIBRATION OF TRANSDUCERS FOR ENVIRONMENTAL POLLUTERS – CO2 CASE STUDY

The transducers employed to measure the concentration of CO2 launched to the atmosphere are only calibrated in a static manner. Thus, the transient effects of the flow of such gas are not properly recorded. This study aims at presenting a new methodology to characterize the dynamic performance of carbon dioxide transducers, and to experimentally determine its transference function. To achieve this goal, a device was developed in which the variables influencing the measures are controlled, allowing the transducer’s dynamic response to be assessed.

O. Postolache, P. Silva Girão, M. D. Pereira
PDA BASED VIRTUAL MEASURING SYSTEM FOR BROADBAND AIR QUALITY MONITORING

The paper presents the implementation of a low cost, small size portable measuring system based on a personal digital assistant (PDA) for indoor air quality monitoring. The virtual system is based on a compact flash data acquisition board (CF-DAQ), plugged-in the PDA, that provides a set of analogue inputs used to read the voltages associated with temperature, humidity and broadband air quality sensors. The acquired voltages corresponding to the air conditions of individual rooms or vehicle cabins under observation are processed at the PDA level using the LabVIEW software that assures the voltage to air quantity conversion (VAQc) using techniques such as look-up tables and polynomial or neural network inverse modelling. A comparison between the above mentioned conversion techniques are considered. Information from the sensors can also be recorded in the PDA memory (quite limited) or in the building room air quality monitoring in a personal computer that are Wi-Fi connected to the PDA.

Samuel E. de Lucena
THE ELECTRONIC DETAIL OF A DIGITAL PH-METER

This paperwork presents the complete circuitry used to build a microcontroller-based pH-meter. Key control software is also discussed. An industry-standard glass combination electrode has been employed for pH detection. Electrode parameter extraction procedure is presented. Good measurement results, with 1% error, have been attained.

A. Michalski, A. Kalicki, Z. Staroszczyk, B. Dziadak, L. Makowski
WWW SYSTEM SOLUTION FOR HYDROCARBON POLLUTION MONITORING AND ENVIRONMENT PROTECTION

The main purpose of this paper is to present the www hydrocarbon pollution monitoring system which is under development at the Warsaw University of Technology (WUT) The dedicated system server collects data from mobile GSM/GPRS accessed observation points, and delivers information on potential pollution to the authorized www clients. The emergency alarm information is planned to be send directly to palmtop/mobile phone equipped emergency teams to assure short response time to environment contamination. The moving observation points property and country wide GSM operator coverage makes the system flexible and universal.

Luis Gurriana
THE EFFECTS OF GEOMETRIC FACTORS ON THE BEHAVIOUR OF TWO ELECTRODES AND THREE ELECTRODES CONDUCTIVITY CELLS: A MODELLING AND SIMULATION SOFTWARE APPROACH

This paper presents a study of the effects of geometric factors on the behaviour of conductivity cells for water quality monitoring.
A modelling and simulation software tool has been used to study the variation of the current density near the cells and its influence on the value of the geometric factor as well as in the value of conductivity.
The effect of the number of electrodes and their relative positions in the value of geometric constant of cells are shown as well as several plots of electric field and current density for different values of conductivity and in the presence of conductive and non conductive objects to study their influence on the conductivity measurements.

Erasmo F. Vergara, Jovani A. Steffani, Samir N. Y. Gerges, Marcos A. Pedroso
UNCERTAINTY ANALYSIS OF NOISE EXPOSURE MEASUREMENTS FOR HEADPHONE USERS

Noise emissions from sources located close to the ear, such as the headphones of telemarketing operators are determined using the international standard ISO 11904. The MIRE and manikin techniques are applied simultaneously to estimate the levels of noise exposure. The uncertainties from different sources are estimated for the determination of the diffuse-field related equivalent continuous A-weighted SPL from an earphone.

C. De Capua, A. Liccardo, R. Morello
A PORTABLE MEASUREMENT SYSTEM BASED ON A PDA DEVICE FOR ACQUIRING AND TESTING ELECTROMAGNETIC FIELD LEVELS

In this paper an user-friendly and manageable measurement system for environmental monitoring and control applications is presented. The specific experimental case concerns the acquisition and processing of the exposure levels to environmental electromagnetic field (EMF). The proposed measurement instrument is equipped with a Personal Digital Assistant (PDA) device and a field probe sensing the electromagnetic field in high frequency range. The small dimensions make it a practical tool in order to monitor the pollution state in urban area. The embedded application allows user to acquire and test in real-time the field levels in order to verify their conformity with fixed exposure limits. The processing stage optimization is achieved by analyzing the influence of measurement uncertainty on the comparison process between measured values and tolerance limits. So, according to measurement result, a confidence level provides information on the response reliability about the compliance or non-compliance with the fixed thresholds. A final report on the PDA display shows user the general EMF trend and the possible limit overcoming happening. Then data can be transmitted to a remote client for further analysis, so designing timely appropriate intervention plans in order to safeguard population from potential hazardous situations.

Page 880 of 977 Results 8791 - 8800 of 9762