Metrology

Přednášející:

Jaroslav Boháček (gar.)

Cvičící:

Jaroslav Boháček (gar.)

Předmět zajišťuje:

katedra měření

Anotace:

After a brief description of the role of the most important domestic and foreign metrological organizations and institutions, explanation is focused on units of measurable quantities and possibilities of their definition, realization, conservation and reproduction by means of measurement standards. After that, attention is paid to measurement methods and techniques for evaluating and increasing measurement accuracy. Facilities and methods applicable to precision measurements of both active and passive electrical quantities are described.

Požadavky:

Osnova přednášek:

1. Metrology and its role in science and industry.

2. Physical quantities and their units. International system of units (SI).

3. Standards of electrical quantities. Quantum standards of voltage and resistance.

4. Thompson-Lampard´s capacitance standard. Transfer and collective standards.

5. Measurement principles, methods and procedures.

6. Errors of direct static measurements. Systematic and random errors. Allan variance.

7. Errors of indirect measurements, law of error propagation. Errors of dynamic measurements.

8. Measurement uncertainties. Type A and type B uncertainties. Law of propagation of uncertainty.

9. Inductive ratio devices and optimization of their metrological parameters.

10. Measurement of current. Current balance, electronic kilogram.

11. Potentiometers. Measurement of voltage in audiofrequency range..

12. DC and AC measurements of electrical resistance.

13. Transformer and current-comparator-based capacitance bridges.

14. Coaxial bridges.

Osnova cvičení:

1. Introductory exercise. Directives for metrological tests of measuring devices.

2. Calibration of digital voltmeters.

3. Calibration of resistance boxes.

4. Investigation of influence of the shield potential on parameters of capacitance standards.

5. Characterization of standards of self- and mutual inductance.

6. Thermoelectric transfer standard.

7. Collective standard of voltage.

8. Thompson-Lampard´s capacitance standard.

9. Measurement of frequency dependences of resistance standards.

10. Application of Hamon transfer standards to precision measurement of voltage ratios.

11. Calibration of inductive voltage dividers.

12. Measurement uncertainties (examples of calculation).

13. Visit to the Czech Metrology Institute.

14. Discussion, assessment.

Cíle studia:

Studijní materiály:

[1] Boháček, J.: Metrology of Electrical Quantities (in Czech). Publishing House of CTU, Prague 1994.

[2] Chudý, V. - Palenčár, R. - Kureková, E. - Halaj, M.: Measurement of Technical Quantities (in Slovak). Publishing House of STU, Bratislava 1999.

[3] Regtien, P. P. L.: Measurement Science for Engineers. Kogan Page Science, London 2004.

[4] Guide to the Expression of Uncertainty in Measurement. ISO, Geneva 1993.

[5] M3003 - The Expression of Uncertainty and Confidence in Measurement. UCAS, Feltham 2007.

Poznámka:

Rozsah výuky v kombinované formě studia: 14p+6l

http://measure.feld.cvut.cz/en/education/courses/AE0M38MET

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