IMEKO Event Proceedings

Page 8 of 792 Results 71 - 80 of 7918

Andrzej Miekina, Roman Z. Morawski
A CALIBRATION METHOD, BASED ON RIDGE LS ESTIMATOR DESIGNED FOR DETERMINATION OF OLIVE OIL MIXTURES ON THE BASIS OF NIR SPECTRAL DATA

The spectrophotometric analysis of oil mixtures, containing olive oil, is the subject of this paper. Its objective is to propose and evaluate a new methodology for determination of a selected component of such a mixture. According to this methodology, the space of concentration values to be estimated is partitioned into subspaces and the calibration is performed separately for each subspace by means of a new piecewise ridge least-squares estimator. The estimation of concentrations is carried out, using the results of calibration, in two cycles: first, rough estimates of concentrations are found and a corresponding subspace is identified; next, the results of calibration, obtained for this subspace, are used for refining the estimates of concentrations. The performance of the proposed methodology is assessed using a criterion related to measurement uncertainty.

T. Dunker, S. Sperling
A CALIBRATION STRATEGY FOR SYSTEMS WITH 2-D LASER SENSORS

We consider measuring machines (MMs), which use one ore more 2-D laser sensors (2-DLSs) for automated dimensional inspection. In order to transform several measurements from their sensor coordinate frame (CF) into a world or object CF, we need a parameterized model of these transformations. We present a method, which allows for very different MMs to set up a model, to construct a calibration object and to estimate the model parameter from measurements on the calibration object.

C. Hirunyapruk, P. Rattanangkul, B. Thummawut, V. Plangsangmas
A CALIBRATION SYSTEM FOR LASER VIBROMETERS AT NIMT

Laser Vibrometers have been used in many applications such as automotive and hard disk drive industries. In metrological field, laser vibrometers are employed as reference standards for the calibration of accelerometers. To have the traceability chain to the International System of Units (SI), several National metrological institutes (NMIs) and companies have developed calibration systems for laser vibrometers. National Institute of Metrology (Thailand), NIMT, is one of those NMIs. This paper describes the set-up for the primary vibrometer calibration system used at NIMT and presents the methods used according to methods 1 and 2 shown in the international standard ISO16063-41. The calibration results are also discussed.

Sari Semenoja, Martti Heinonen
A calibration system for PTU devices

Devices measuring pressure, temperature and humidity simultaneously are known as PTU devices. There are hardly any commercial calibration systems for the PTU devices available for low temperatures (< 0 °C). To obtain more comprehensive data on the performance of PTU devices, a new calibration system is developed at MIKES. In this PTU Apparatus, pressure, temperature and humidity can be controlled simultaneously so that all combinations over the ranges are possible. The nominal ranges of the system are the following: absolute pressure 500 hPa … 1200 hPa, temperature -52 °C … +80 °C and relative humidity 10 % … 95 %. The estimated uncertainties (k = 2) of the pressure, temperature and humidity are 10 Pa, 0,1 °C to 0,3 °C and 1 %RH to 3 %RH, respectively. The construction and operation as well as the results of operational tests of the PTU Apparatus are reported in this paper.

Georgiana Moraru, Marcel Istrate
A Case Study In Water And Wastewater Systems’ Energy Efficiency

World economy is closely related to energy and to how it contributes to the modernization of the society, by raising the standard of living and the degree of civilization of the population. In this context, water supply systems are attractive for energy efficiency, occupying an important place in the hierarchy of energy consumers. The purpose of this paper is to present some important aspects of a case study that must be considered in order to respond to specific requirements of water supply systems and it also shows a few measures that can be implemented with or without investments in order to reduce costs and energy consumption.

Cristiano Benedetto De Vita
A Case Study of Agrarian Assets in the Territory of Caere (6th-5th century BC)

The present paper defines some approaches employed to study the agrarian landscape of the Etruscan city of Caere.The aim is to verify some features of rural infrastructures of this territory, which has been planned systematically since the end of the 7th- early 6th century BC. Through the use of different approaches – from the archaeomorfology to the metrology, to the aerial photo interpretation – the research seeks to verify those signs suggesting systematic and symmetrical forms of occupation of the Caeretancountryside, as an effect of an articulated plan imposed by the city at the time of its greatest expansion. The results, still under development, show the constant recurrence of distances and orientations, with variations often related to the characteristics of the territory or the needs of community exploitation.

Helena Ramos, M. Pereira, V. Viegas, O. Postolache, P. Girão
A CENTRONICS BASED TRANSDUCER INDEPENDENT INTERFACE (TII) FULLY COMPLIANT WITH 1451.2 STD.

The paper reports the tests conducted on a dedicated Transducer Independent Interface (TII) to check its compliance with standard IEEE 1451.2 specifications. The interface was built using a synchronous data transfer based on the Serial Peripheral Interface (SPI) protocol integrated in a PIC microcontroller used as the Smart Transducer Interface Module (STIM) and the Centronics port of the PC, used as the Network Capable Application Processor (NCAP’s TII port). The description of each line and the connections are also presented.
The working prototype of the STIM controlled by a NCAP module was implemented to connect several transducers without communication capabilities used in a water quality monitoring network. The NCAP, also described in the paper, is emulated in a PC and it was fully developed using LabVIEW 6.1.

Halina Nieciag, Zbigniew Chuchro
A CERTAIN METHOD FOR CHEBYSHEV APPROXIMATION USED IN IOS METROLOGICAL SOFTWARE

The paper presents a method that is an attempt to solve the problem of non-linear approximation of geometrical elements according to Chebyshev norm. On the base of general two step algorithm it performs an evaluation of minimal deviation from maximal values of measured shapes driving to the optimal solution on the iterative way. The proposed method implemented for some geometric features has been verified for a many samples of simulated and measured datapoints.

Fabio Leccese
A CHEAP WI-FI INSTRUMENTATION REMOTE CONTROL PLATFORM FOR ELECTRIC AND ELECTRONIC DIDACTIC LABORATORY

Remote control of instrumentations and the connected measurement techniques represent an interesting topic particularly appreciated in some sectors as industry, research and e-learning. The current technologies allow to fully control modern instrumentation that is already conceived for this aim, while it is harder to manage old instrumentation not specifically designed for this kind of control. At the moment the costs are strongly conditioned by the current architecture that uses a personal computer as local server to manage the local instrumentations making impossible a really common use of these technologies. In this paper a system for remote controlling instrumentations implementing IEEE 488 or otherwise, based on an economic Wi-fi architecture, is described.

Yongping Han, Shahin Mehdizad Taleie, Tino Copani, Bertan Bakkaloglu, Sayfe Kiaei
A CMOS 1.5-Bit ΣΔ DIGITAL IF TO RF TRANSMITTER FOR WCDMA APPLICATION

A digital intermediate frequency (IF) to RF transmitter targeted for 2 GHz wideband code division multiple access (WCDMA) is presented. The proposed transmitter integrates a 3-level digital IF current-steering cell, an up-conversion mixer with a tuned load and an RF variable gain amplifier (RF VGA) with an embedded semidigital finite impulse response (FIR) reconstruction filter. A 4th-order 1.5-b IF bandpass sigma delta modulator (BP ΣΔM) is designed to guarantee in-band signal-to-noise ratio (SNR) and error vector magnitude (EVM) performances while the out-of-band quantization noise due to noise shaping is suppressed by the embedded FIR reconstruction filter to meet spectrum emission mask and ACPR requirements. The on-chip RF VGA provides 50 dB power scaling in 10-dB steps with less than 1 dB gain error. Together with the power control at the ΣΔM stage, the 74-dB dynamic range at RF frequency is achieved. The design is fabricated in a 4-metal 0.18-µm CMOS technology with a total core area of 0.8 × 1.6 mm². The IC delivers 0 dBm output power to the 50 Ω load at 2 GHz and it draws approximately 120 mA from a 1.8 V DC supply at the maximum output power.

Page 8 of 792 Results 71 - 80 of 7918