International and National Journals
A. Balsamo, G. Mana, F. Pennecchi
The expression of uncertainty in non-linear parameter estimation
Metrologia, Vol. 43, pp. 396-402, 2006.
We made an analysis of uncertainty propagation in parameter estimation when the cost function minimization leads to a set of non-linear equations. In our study, which concerns an uncertainty-propagation law independent of any specific minimization algorithm, we review the relationship between the Hessian of the cost function and the estimate uncertainty, as well as the reasons supporting their identification. We show that the uncertainty expressed on this basis could lead to accuracy overestimation.
M. Pisani, M. Astrua
Angle amplification for nanoradian measurements
Applied Optics, Vol 45, no. 8, pp. 1725-1729, 2006.
A method to amplify the rotation angle of a mirror, based on multiple reflections between two quasi-parallel mirrors, is presented. The method allows rotations of fractions of nanoradians to be measured with a simple setup. The working principle, the experimental setup, and the results are presented.
A. Balsamo, A. Meda
Geometrical error compensation of coordinate measuring systems
Nanotechnology and Precision Engineering, Editorial Office of Nanotechnology and Precision Engineering, Tianjin (China), Vol. 4, no. 2, pp. 83-91, 2006.
Software compensation of coordinate measuring systems (CMSs) is widely used for its potential in improving CMS performances with a limited marginal cost. Even for those CMSs whose model equations are well established, still a question remains on whether the associated experimental procedure to derive the model parameters is optimal. In less fortunate cases, even the model equation is not well established, and a complete exercise is needed, from modelling to testing. This paper approaches this problem in a procedural way, by defining a sequence of steps to follow. For each of them, the relevant problems are pointed out and advice is given. are carried out through two cases with very different in nature and mathematical description. The cases of two CMSs are discussed, very different in nature and mathematical description.
J. P. Wallerand, L. Robertsson, L. S. Ma, M. Zucco
Absolute frequency measurement of molecular iodine lines at 514.7 nm, interrogated by a frequency-doubled Yb-doped fibre laser
Metrologia, Vol. 43, no. 3, pp. 294-298, 2006.
The frequency of several hyperfine components of 127I2 has been measured at 514.67 nm using an optical frequency comb. Among them, the a3 component of the P(13)43-0 transition is recommended by the CIPM for the practical realization of the definition of the metre. The result is consistent with other measurements of the same line within 1.5 kHz of uncertainty, when the collisional shift is taken into account. A frequency-doubled distributed feedback fibre laser has been developed to carry out these measurements.
R. Hamid, E. Sahin, M. Celik, G. Özen, M. Zucco, L. Robertsson, L.-S. Ma
10-12level reproducibility of an iodine stabilized He-Ne laser endorsed by absolute frequency measurements in the BIPM and UME
Metrologia, Vol. 43, no. 1, pp. 106-108, 2006.
The absolute frequency of the f-component for the UME laser was measured with the BIPM femtosecond laser comb to be (473 612 353 602.0 ± 1.1) kHz during 3 March to 8 March, 2003 and with the UME comb to be (473 612 353 600.6 ± 1.1) kHz from 20 June to 25 June, 2005. After appropriate correction for power and modulation shifts a subkilohertz agreement between the two measurements was found. Moreover, the relative frequency stability for different UME-BIPM laser pairs is investigated using standard heterodyne techniques and Allan variance statistics.
A. Meda, A. Balsamo
Error correction of a triangulation vision machine by optimization
P. Ciarlini, E. Filipe, A. B. Forbes, F. Pavese, C. Perruchet, B. Siebert (editors), Advanced Mathematical and Computational Tools in Metrology VII, pp. 316-319, World Scientific, Singapore, 2006.
This paper reports the error model, the identifiability study of its parameters, its software simulation and the experimental validation used to compensate the error of a triangulation vision machine (AVS-Active Vision System) intended for monitoring and diagnosing monuments and other Cultural Heritage. A careful alignment is required but not sufficient to achieve the sought performance. In addition, operation in open air - where temperature fluctuations up to ±15 K are expected - and transportation would require realignment on the spot. As the errors resulting from misalignment are highly repeatable, they are best compensated in software.
A. Balsamo, M. Cibien
Regole decisionali: ISO ed ASME a confronto
Tutto Misure, n. 1, pp. 15-19, 2006.
L'incertezza di misura gioca un ruolo fondamentale non solo in ambito strettamene metrologico, ma anche in campo industriale, dove la misurazione viene essenzialmente usate come base decisionale. Le decisioni basate su misure sono necessariamente incerte, ed occorre definire regole decisionali in grado di trattare quest'incertezza. Dal punto di vista normativo, esistono due approcci al problema, almeno nel campo di competenza del sistema GPS(Geometrical Product Specification): quello dell'ISO, descritto nella serie di norme ISO 14253, e quello delL'ASME, descritto dalle ASME B89.7.3. Quest'articolo tenta un confronto critico fra i due approcci, indicando quali parti sono in comune, e come l'utilizzatore può beneficiare d'entrambi.
M. Pisani
Il premio Nobel per la fisica e la definizione del metro
Tutto Misure, n. 2, p. 141, 2006.
A. Balsamo
Le misure alla 55a Assemblea Generale del CIRP
Tutto Misure, n. 2, pp. 155-156, 2006.
Breve resoconto delle novità emerse durante l'Assemblea del CIRP (Accademia Internazionale d'Ingegneria di Produzione), e recensione degli articoli principali presentati nella parte congressuale.
A. Balsamo
A Charlotte la riunione del ISO/TC213 - GPS
Tutto Misure, n. 3, pp. 226-229, 2006.
Breve resoconto della riunione della commissione tecnica dell'ISO/TC213 Specifica e verifica geometrica dei prodotti .
A. Balsamo, M. Cibien
CMM: strumento principe della metrologia dimensionale
Unificazione & Certificazione, n. 7, pp. 12-14, 2006.
Le macchine di misura a coordinate (CMM) sono uno strumento dimensionale di straordinaria versatilità. Esse costituiscono l'elemento di trasferimento fra il mondo fisico e materiale e quello numerico della descrizione virtuale. In questo senso, esse sono l'elemento duale del CIM, che trasferisce la descrizione numerica di un prodotto nel prodotto stesso, attraverso la lavorazione automatica. Il triangolo ideale è chiuso tramite il CAD, che trasferisce la descrizione virtuale in sequenze di lavorazione.
Conference Proceedings
E. Barini, M. P. Sassi
Gauge blocks measurements by mechanical comparison: aspects of the uncertainty budget through the analysis of an interlaboratory comparison
Proceedings of the CAMET International Conference on Metrology, Casablanca (Marocco), April 2006.
S. Cesare, G. Sechi, L. Bonino, R. Sabadini, M. Marotta, F. Migliaccio, M. Reguzzoni, F. Sansò, A. Milani, M. Pisani, B. Leone, P. Silvestrin
Satelite-to-satellite laser tracking mission for gravity field measurement
1stInternational Symposium of the International Gravity Field Service, Istambul (Turkey), August 2006.
L. Bonino, F. Bresciani, G. Piasini, M. Pisani, A. Cabral
An interferometer for high-resolution optical surveillance from geo - internal metrology breadboard
Proceedings of ICSO 2006, 6th International Conference on Space Optics, ESTEC, Noordwijk (The Netherlands), 27-30 June 2006 (ESA SP-621, June 2006, N. Armandillo and A. Wilson eds.).
L. Bonino, F. Bresciani, G. Piasini, C. Flebus, J. H. Lecat, S. Roose, M. Pisani
An interferometer for high-resolution optical surveillance from geostationary orbit
Proceedings of ICSO 2006, 6th International Conference on Space Optics, ESTEC, Noordwijk (The Netherlands), 27-30 June 2006 (ESA SP-621, June 2006, N. Armandillo and A. Wilson eds.).
F. D'Angelo, L. Bonino, S. Cesare, G. Castorina, S. Mottini, F. Bertinetto, M. Bisi, E. Canuto, F. Musso
Laser metrology and optic active control system for GAIA
Proceedings of ICSO 2006, 6thInternational Conference on Space Optics, ESTEC, Noordwijk (The Netherlands), 27-30 June 2006 (ESA SP-621, June 2006, N. Armandillo and A. Wilson eds.).
Technical Reports
F. Alasia, F. Bertinetto, M. Bisi, P. Cordiale, G. La Piana, G. Martini, A. Rivetti
Thrust measurement system voice coil characterization
INRIM Technical Report no. 1, February 2006.
This Report describes the characterization of an electromagnetic actuator realized by ETEL SA, Switzerland. The actuator calibration constant, i.e. the force step obtained after a LSB change of the 18-bit force command, has been calculated. The e_ect of the assembling of the actuator parts has been investigated. A proper mounting tool has been realized. The activity described in this Report was performed in the framework of the Nanobalance Facility Upgrade Contract 572540534561 and funded by Alcatel Alenia Space Italia.
M. Bisi
A note on the lens selection for the mode-matching of the laser beam to the Nanobalance optical cavity
INRIM Technical Report no. 37, November 2006.
This document is issued in the framework of the Alcatel Alenia Space Italia S.p.A. contract 572640535748. It aims to provide the guidelines for the correct selection of the lens necessary for the proper mode-matching of the laser to the Nanobalance optical cavity.
G. E. D'Errico
Logica e incertezza
Rapporto Tecnico INRIM n. 40, novembre 2006.
Si delinea un'analisi comparativa, in termini logico-matematici, di alcuni paradigmi per l'elaborazione dell'incertezza: calcolo della probabilità, sistemi multivalenti, teoria dei sistemi sfumati e teoria matematica dell'evidenza. Ragioni a supporto basilare della preferibilità del paradigma probabilistico sono evidenziate e discusse.