Centre for Thermometry, Photometry and Radiometry
Contacts:
Ing. Renáta Knorová
riaditeľ centra
tel.: 02/60294 228
e-mail: knorova@smu.gov.sk
Jarmila Steigaufová
sekretariát
tel.: 02/60294248
e-mail: steigaufova@smu.gov.sk
THERMOMETRY LABORATORY
Quantity - temperature.
Unit - of thermodynamic temperature is K (Kelvin) or °C (Celsius), which is by definition equal in magnitude to the kelvin. The kelvin and the degree Celsius are also the units of the International Temperature Scale.
Tasks of the laboratory
The main task of theLlaboratory is the realisation of the temperature scale.
International comparisons
CIPM CCT K-3, EUROMET 552.
1. Temperature (resistance, liquid-in-glass thermometers): Range: -39°C to 962°C
Available metrological services
Calibration of resistance thermometers in temperature range from -39°C to 962°C and liquid-in-glass thermometers in the temperature range -39°C to 190°C. Type tests of resistance thermometers. Consulting.
Methods of measurement:
- calibration by comparison method or direct measurement at defining fixed points.
Instruments in use
The National Standard (key comparison CCT-K3 for range from 0°C to 660°C, EUROMET project 552 in progress for range from -39°C to 660°C:
- defining fixed point,
- standard-platinum resistance thermometers (SPRT),
- set of liquid thermometers,
- set of furnace,
- resistance bridge.
Contact
Dr. Stanislav Ďuriš
phone: + 421 2 60294 277
e-mail: duris@smu.gov.sk
Mrs. Renáta Knorová
phone: + 421 2 60294 288
e-mail: knorova@smu.gov.sk
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2. Temperature (thermocouples) Range: 0°C to 1553°C
Available metrological services
calibration of thermocouples within given temperature range (Calibration at defining fixed poits - thermocouples: calibration at freezing point of In, Sn, Zn, Al, Ag, Au, Pd. Expanded uncertainty is 0.4°C to 5°C, for k=2. And calibration by comparison - thermocouples: combined standard uncertainty of calibration is 1°C to 8 °C).
Methods of measurement:
- calibration by comparison method, wire bridge method or direct measurement at defing fixed points.
Instruments in use
SMU furnace for temperature fixed points Defining fixed points. Standard-platinum resistance thermometers. Standard thermocouples. Set of liquid thermostats, set of furnace, multimeter.
Contact
Mr. Ladislav Oravec
phone: + 421 2 60294 447
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3. Heat
Range: All types of measuring instruments produced in the Slovak Republic and imported to the Slovak republic. Temperature range of heat-conducting fluids: - water: 0°C to 200°C; - steam: 100°C to 600°C.
Maximum premissible relative errors of heat meters for water:
2 % to 4 % of RDG for the accuracy class of 2,
4 % to 6 % of RDG for the accuracy class of 4,
5 % to 8 % of RDG for the accuracy class of 5.
Traceability to the standards: traceability is ensured using standards of temperature, pressure, flowrate, electrical resistance and frequency.
Available metrological services
Pattern testing of calorimetric counters and resistance thermometers. Verification of calorimetric counters and temperature sensors.
Methods of measurement:
- an indirect method of the heat consumption determination using a simulation of heat-conducting fluid volumes or flowrates and its temperatures.
Instruments in use
Centesimal resistance decades for the temperature simulation. Sources of electric signal for simulation of flow rate or volume. Counter, multimeter, electric stop watch and auxiliary devices.
Contact
Dr. Stanislav Ďuriš
phone: + 421 2 60294 277
e-mail: duris@smu.gov.sk
Mrs. Renáta Knorová
phone: + 421 2 60294 288
e-mail: knorova@smu.gov.sk
PHOTOMETRY LABORATORY
Quantity - The basis unit Candela of photometric quantity - luminous intensity - is defined as follows: the Candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540x1012 Hz and that has a radiation intensity in that direction of 683-1 watt per sterradian.
Unit - Candela (cd), lumen (lm), lux (lx), cd·m-2, kelvin (K).
Tasks of the laboratory
The main tasks of the Laboratory are research and development for the realisation and dissemination of the units of the physical quantities of luminous intensity, luminous flux, illuminance, luminance, spectral temperature distribution and calibration and certification of luminous intensity standards and instruments.
International comparisons
CCPR Key Comparison K3-a of Luminous intensity with Lamps as Transfer standards, 1998.
CCPR Key Comparison K4 of Luminous flux with Lamps as Transfer standards, 1998.
CCPR Key Comparison K3-b of Luminous responsivity measurement, 1998.
Available metrological services
Methods of measurement:
- the transfer of the luminous intensity scale is realised using a method of variable distance on the optical bench at the spectral distribution temperatures of 2024 K, 2353 K and 2856 K. The spectral distribution temperature is measured by two colour filtres method. Standards of the luminous flux are regularly verified at the BIPM Paris. Calibration of the luminance meters is performed using the source of luminance compared to the standards of luminous intensity. Illuminance meters are calibrated by the working luminous intensity standards - standard photometric incandescent lamps.
Instruments in use
The primary standard of lumious intensity is based on properties of special photometric heads with perfect match V (λ) function are used. For transfer of luminous intensity scale a set of unique photometric incandescent lamps and spectral sensitivity photodetectors exactly corrected to the V (λ) function are used. Luninous flux measurement is performed using an integrating sphere. The equipment is installed in a black air-conditioned laboratory with the floor vibration isolation.
Supplementary activities
There is a possibility to perform if negotiating with a consumer, other measurements in the laboratory: measurement of spectral intensity of the radiation sources in visible and near IR region; spectral sensitivity calibration of optical radiation detectors in spectral range from 350 nm to 800 nm; CCPR Key Comparison of Luminous Responsitivity K3b, 1998; CCPR Key Comparison of Luminous Intensity K3a, 1999; CCPR Key Comparison of Luminous Flux K4, 1999; CCPR Key Comparison of Spectral Responsitivity K7, 2001.
Contact
Dr. Peter Nemecek
phone: + 421 2 60294 278
e-mail:nemecek@smu.gov.sk
OPTICAL RADIOMETRY and PYROMETRY LABORATORY
Available metrological services
Calibration of optical radiometers and optical radiation sources. Spectroradiometers calibration in spectral responsivity in spectral range from 300 nm to 10500 nm with the total uncertainty of (0.14 - 2.5) % in accordance withe the spectral range and responsivity of calibrated radiometer.
Methods of measurement:
- the basic method of radiometers and spectroradiometers calibration is the comparison method using standard radiometers, spectroradiometers and suitable optical radiation sources consisted of monochromator and other optical (filtres, reflectors, lenses, etc.) and mechanical elements (diaphragms, modulators, etc.). For the purpose of optical radiometers calibration the procedures were elaborated at the SMU and the international standards e.g. EN 613 Calibration of fibre optic power meter are used. The basic primary standard radiometers are compared to the metrological laboratories abroad (Key comparison CCPR-K2.a, CCPR-K2.b). The total uncertainty of measurement (0.14 - 2.5) % is dependent on spectral band, level of irradiation or radiant flux.
Instruments in use
The equipment of radiometric laboratory consists of a set of optical radiometers and spectroradiometers for different spectral regions and energetic levels, optical radiation sources and equipment for broadband and spectral measurement.
Supplementary activities
With the exception of activities mentioned above, the laboratory participates in projects of metrological assurance for various areas of optics and optoelectronics. Besides common metrological services the laboratory provides expertises including measurements as follows:
- calibration of UV radiometers on Hg and Ne lines up to the value of radiant flux of 50 µW resp. 500 mW; calibration of monochromators at the wavelength of Hg, Ne, Cd, Na and other discarge lamps in the spectral band 300 - 2800 nm, resp. a monochromator scale checking in medium and infra-red bands; radiometric measurement of emittance with temperatures greater than 300K; measurement of transmittancy factor, directional and total reflection in IR and visible band of optical spectrum; expect evaluation of optical system power engineering in visible and IR band optical spectrum; measurement of basic parameters of optical detectors and their evaluation according to the needs of user; theoretic analyses of transfer energy by optical radiation; measurement of refractive index in IR spectral band.
Contact
Dr. Peter Nemeček
phone: + 421 2 60294 278
e-mail: nemecek@smu.gov.sk
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1. Temperature (PYROMETRY)
Range: 962°C to 2200°C
Uncertainty of calibration: uc = (0.5 to 3)°C
Available metrological services
Calibration of measuring instruments (optical pyrometers, temperature lamps) within a given temperature range.
Methods of measurement:
- calibration within a given temperature range is performed using a comparison method.
Instruments in use
Set of standard temperature lamps. Photoelectric pyrometer, optical pyrometer. Blackbody models of defining fixed points.
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Range: 600°C to 1550°C
Combined standart uncertainty of calibration (verification): uc = (0.7 to 2)°C
Available metrological services
Calibration of measuring instruments (radiation pyrometers) within a defined temperature range.
Methods of measurement:
- calibration of a comparison method.
Instruments in use
SMU standard pyrometer Standard photoelectric pyrometer. Set of blackbody models.
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Range: -15°C to 900°C
Combined standart uncertainty of calibration (verification): uc = (0.5 to 0.7)°C
Available metrological services
Calibration of measuring instruments (radiation pyrometers) within a given temperature range.
Methods of measurement:
- a comparative method.
Instruments in use
Platinum resistance temperature standard. Set of blackbody models.
Contact
Dr. Stanislav Ďuriš
phone: + 421 2 60294 277
e-mail: duris@smu.gov.sk
Dr. Peter Nemeček
phone: + 421 2 60294 278
e-mail: nemecek@smu.gov.sk
