A Capacitance Build-Up Method to Determine LCR Meter Errors and Capacitance Transfer

We present a capacitance build-up method suitable for the determination of the measurement error of a capacitance meter. The method requires only a small number of uncalibrated base capacitors, to be connected in parallel in various combinations, and a single calibrated capacitor, which provides measurement traceability. The outcome of the method is both the determination of the meter error and the calibration of all the base capacitors; it can therefore be also considered a capacitance scaling method. The method's equations, cast in matrix form, express estimates and uncertainties for all the quantities of interest. As an example of application, a commercial LCR meter is calibrated in the ranges of (100-1000) pF and (1-10) nF at 1.6 and 10 kHz, with an accuracy at the level of a few parts in 10(6). The calibration is validated by comparison with an ultrahigh accuracy capacitance bridge

An international comparison of phase angle standards between the novel impedance bridges of CMI, INRIM and METAS

We report here the results of a comparison of electrical impedance standards aimed at evaluating four novel digital impedance bridges developed by the national metrology institutes CMI, INRIM and METAS. This comparison, which is the first of its kind, involved phase angle impedance standards developed by TÜBITAK UME with phase angles of  ± 30° and  ± 60°, and magnitudes ranging from about 100 Ω to 1 MΩ. The comparison demonstrated agreement among the measurement results obtained with the different bridges, and allowed us to gather information on the stability of the phase standards and on more critical aspects related to the characterization of the bridges

Advanced photonic and electronic systems - WILGA 2017

WILGA annual symposium on advanced photonic and electronic systems has been organized by young scientist for young scientists since two decades. It traditionally gathers more than 350 young researchers and their tutors. Ph.D students and graduates present their recent achievements during well attended oral sessions. Wilga is a very good digest of Ph.D. works carried out at technical universities in electronics and photonics, as well as information sciences throughout Poland and some neighboring countries. Publishing patronage over Wilga keep Elektronika technical journal by SEP, IJET by PAN and Proceedings of SPIE. The latter world editorial series publishes annually more than 200 papers from Wilga. Wilga 2017 was the XL edition of this meeting. The following topical tracks were distinguished: photonics, electronics, information technologies and system research. The article is a digest of some chosen works presented during Wilga 2017 symposium. WILGA 2017 works were published in Proc. SPIE vol.10445

Sensors for food industry: two cases of study

La tesi illustra alcuni esempi di analisi su liquidi alimentari utilizzando la spettroscopia d'impedenza e gli ultrasuoni. Per le misure d'impedenza elettrica sono stati utilizzati dei sensori interdigitati senza la presenza di alcuno strato bio-recettore, normalmente utilizzato per aumentarne la selettività. Le misurazioni hanno riguardato l'analisi di latte vaccino per la verifica di adulterazioni attraverso l'aggiunta di acqua e contaminazioni da detergenti. Nonostante la buona sensibilità di questi sensori in alcune applicazioni, si è riscontrata una saturazione nelle misure su liquidi ad elevata conduttività. Per questo motivo si è progettata e sperimentata una nuova cella elettrochimica a geometria variabile che permette di risolvere questo problema al costo di una maggiore complessità di misura. L'utilizzo degli ultrasuoni ha invece riguardato la misurazione della loro velocità di propagazione in liquidi, al fine di ottenere informazioni sulla densità di questi ultimi. L'intero sistema di trasmissione e ricezione è stato progettato basandosi sull'utilizzo di trasduttori piezoelettrici. Attraverso simulazioni è stato verificato un nuovo metodo di valutazione del tempo di arrivo, basato sulla stima dell'incertezza degli attraversamenti di zero, successivi al primo, nell'oscillazione innescata al ricevitore. Come attività collaterale è inoltre riportato il progetto di un sistema di controllo per fluidi a regime impulsato basato sull'utilizzo di un anemometro a film caldo senza alcun tipo di compensazione.Some examples of analysis on food liquids, based on impedance spectroscopy and ultrasounds techniques, are shown. InterDigitated Array Microelectrodes, IDAMs, have been used with the purpose of verifying their sensitivity in milk quality control. Oppositely to their typical use, no bio-recognition elements have been applied on the sensors surface. Milk affected by adulteration with water, or by contamination with cleaning solutions, was the main topic of the performed measurements. Good sensitivity was found for some applications but a not linear behaviour gathers from measurements on high conductive solutions. A new electrochemical cell, with variable dimensions, was designed and tested for solving that problem at the cost of a more complex measurement. Ultrasounds were used for measuring their propagation speed in liquids with the aim of gather information about the solution density. Transmitter and receiver were designed using piezoelectric transducers. The post processing was simulated to study a new technique for the estimation of the arrival time based on the zero crossing times following to the first one in the received waveform. As a fringe activity, a flow control system was designed and tested for monitoring pulsed flows, using a hot film anemometer without any compensation technique and adaptive filters

Modeling EMI Resulting from a Signal Via Transition Through Power/Ground Layers

Signal transitioning through layers on vias are very common in multi-layer printed circuit board (PCB) design. For a signal via transitioning through the internal power and ground planes, the return current must switch from one reference plane to another reference plane. The discontinuity of the return current at the via excites the power and ground planes, and results in noise on the power bus that can lead to signal integrity, as well as EMI problems. Numerical methods, such as the finite-difference time-domain (FDTD), Moment of Methods (MoM), and partial element equivalent circuit (PEEC) method, were employed herein to study this problem. The modeled results are supported by measurements. In addition, a common EMI mitigation approach of adding a decoupling capacitor was investigated with the FDTD method

Abstracts on Radio Direction Finding (1899 - 1995)

The files on this record represent the various databases that originally composed the CD-ROM issue of "Abstracts on Radio Direction Finding" database, which is now part of the Dudley Knox Library's Abstracts and Selected Full Text Documents on Radio Direction Finding (1899 - 1995) Collection. (See Calhoun record https://calhoun.nps.edu/handle/10945/57364 for further information on this collection and the bibliography). Due to issues of technological obsolescence preventing current and future audiences from accessing the bibliography, DKL exported and converted into the three files on this record the various databases contained in the CD-ROM. The contents of these files are: 1) RDFA_CompleteBibliography_xls.zip [RDFA_CompleteBibliography.xls: Metadata for the complete bibliography, in Excel 97-2003 Workbook format; RDFA_Glossary.xls: Glossary of terms, in Excel 97-2003 Workbookformat; RDFA_Biographies.xls: Biographies of leading figures, in Excel 97-2003 Workbook format]; 2) RDFA_CompleteBibliography_csv.zip [RDFA_CompleteBibliography.TXT: Metadata for the complete bibliography, in CSV format; RDFA_Glossary.TXT: Glossary of terms, in CSV format; RDFA_Biographies.TXT: Biographies of leading figures, in CSV format]; 3) RDFA_CompleteBibliography.pdf: A human readable display of the bibliographic data, as a means of double-checking any possible deviations due to conversion

ATS-6 engineering performance report. Volume 5: Propagation experiments

Propagation experiments at 1550 MHz to 1650 MHz are reviewed, including the Integrated L-Band Experiments system and results, and the Mobile L-Band Terminals for Satellite Communication system. Experiments at 4 GHz to 6 GHz are reported, including the Radio Frequency Interferometer Measurements system and results, and Earth station antenna evaluations. Experiments above 10 GHz are discussed, including Comsat and ATS-6 millimeter wave propagation/experiments, and communication ATS-6 version at 20 and 30 GHz