The monitoring system which consist of 40 air temperature sensors, 5 relative humidity sensors an... more The monitoring system which consist of 40 air temperature sensors, 5 relative humidity sensors and one air pressure sensor was prepared and used for determination of environmental conditions on the 50 m interferometric comparator. Large gradients along the test bench and rapid changes in local conditions were obtained. The uncertainty of the measuring system was estimated using Monte Carlo method. The uncertainty of calculation of refractive index of air was estimated on u(n) = 0,000 000 42. This level of uncertainty fulfils requirements for the verification of the CNAM and PTB measurement systems in harsh condition environment.
At its meeting in October 2014, the EURAMET TC for Length, decided upon a key comparison on the c... more At its meeting in October 2014, the EURAMET TC for Length, decided upon a key comparison on the calibration of diameter gauges, named EURAMET.L-K4.2015. Twenty National Metrology Institutes and one Designated Institute from Europe, Asia and South America participated in this comparison, which was carried out in two parallel groups. Twelve laboratories from EURAMET participated in group 1, while ten laboratories from EURAMET and two laboratories from GULFMET and SIM participated in group 2. To provide the link three laboratories, CEM, INRIM and METAS, participated in both groups and in the key comparison CCL-K4.2015. Two sets of gauges consisting of two rings, two plugs and a sphere were circulated in parallel in the two groups, the circulation started in November 2016 and completed in February 2018. The reference value (KCRV) was calculated on a gauge-per-gauge basis as the weighted mean of the submitted results of the diameter, roundness and straightness measurements. With group 1, inconsistent results (En> 1) gave a number of 5 out of 60 independent results for diameter and 7 out of 77 for roundness, while with group 2 a number of 6 out of 59 for diameter. These numbers are reflected in the comparison with reference values, while it is worth noting that with the two plugs of 100 mm diameter a decrement of 2 inconsistent results is achieved by introducing an uncertainty contribution related to the apparent change of length of these gauges. Furthermore, the KCRV was calculated by linking the two groups for the diameter of all the twin gauges and for the roundness of the twin spheres. When compared to those calculated independently for each group, minor changes of the KCRVs and associated uncertainties are observed from linking the groups. Consistency checks are satisfied for most of the gauges with the exception of the plugs 100 mm, which suffer from an apparent change in length during the circulation. With the linking, inconsistent results gave a number of 12 out of 119 independent results for the diameter and 1 out of 21 for roundness of the sphere. The comparison results help to support the calibration and measurement capabilities (CMCs) of the laboratories, while recommendations and actions were agreed with those having inconsistent results. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
This paper shows the result of work of the Institute of Micromechanics and Photonics at Warsaw Un... more This paper shows the result of work of the Institute of Micromechanics and Photonics at Warsaw University of Technology and the Length and Angle Division of Central Office of Measures (GUM) [1] in building an automatic multiwavelength interferometric system with extended measurement range for calibration of long (up to 1 m) gauge blocks. The design of a full working setup with environmental condition control and monitoring systems, as well as image analysis software, is presented. For length deviation determination the phase fraction approach is proposed and described. To confirm that the system is capable of calibrating gauge blocks with assumed accuracy, a comparison between the results of 300 mm length gauge block measurement obtained by using other systems from the Central Office of Measures is made. Statistical analysis proved that the system can be used for high precision measurements with assumed standard uncertainty (125 nm for a length of 1 m). Finally the comparison betwee...
The gauge block interferometer for long gauge blocks up to 500 mm, used for years in the Length L... more The gauge block interferometer for long gauge blocks up to 500 mm, used for years in the Length Laboratory of Length and Angle Division of GUM, was modernized. The measuring method used on the measuring set-up based on the interference in white light, was supplemented with the method of exact fractions based on laser light sources. The measurement of gauge blocks with the modernized set-up may be carried out using the method applied so far, which involves the use of the low coherence white light to detection of gauge block ends by interference and the measuring of the reference mirror displacement corresponding to the length of a gauge block measured by the Renishaw interferometer. After modernization the measurement with use of laser light interference is also possible. For the method of exact fractions, two stabilized He-Ne lasers with wavelengths of 633 nm and 543 nm are used as the standards. The main changes of the measuring system are related to providing a properly formed las...
The monitoring system which consist of 40 air temperature sensors, 5 relative humidity sensors an... more The monitoring system which consist of 40 air temperature sensors, 5 relative humidity sensors and one air pressure sensor was prepared and used for determination of environmental conditions on the 50 m interferometric comparator. Large gradients along the test bench and rapid changes in local conditions were obtained. The uncertainty of the measuring system was estimated using Monte Carlo method. The uncertainty of calculation of refractive index of air was estimated on u(n) = 0,000 000 42. This level of uncertainty fulfils requirements for the verification of the CNAM and PTB measurement systems in harsh condition environment.
At its meeting in October 2014, the EURAMET TC for Length, decided upon a key comparison on the c... more At its meeting in October 2014, the EURAMET TC for Length, decided upon a key comparison on the calibration of diameter gauges, named EURAMET.L-K4.2015. Twenty National Metrology Institutes and one Designated Institute from Europe, Asia and South America participated in this comparison, which was carried out in two parallel groups. Twelve laboratories from EURAMET participated in group 1, while ten laboratories from EURAMET and two laboratories from GULFMET and SIM participated in group 2. To provide the link three laboratories, CEM, INRIM and METAS, participated in both groups and in the key comparison CCL-K4.2015. Two sets of gauges consisting of two rings, two plugs and a sphere were circulated in parallel in the two groups, the circulation started in November 2016 and completed in February 2018. The reference value (KCRV) was calculated on a gauge-per-gauge basis as the weighted mean of the submitted results of the diameter, roundness and straightness measurements. With group 1, inconsistent results (En> 1) gave a number of 5 out of 60 independent results for diameter and 7 out of 77 for roundness, while with group 2 a number of 6 out of 59 for diameter. These numbers are reflected in the comparison with reference values, while it is worth noting that with the two plugs of 100 mm diameter a decrement of 2 inconsistent results is achieved by introducing an uncertainty contribution related to the apparent change of length of these gauges. Furthermore, the KCRV was calculated by linking the two groups for the diameter of all the twin gauges and for the roundness of the twin spheres. When compared to those calculated independently for each group, minor changes of the KCRVs and associated uncertainties are observed from linking the groups. Consistency checks are satisfied for most of the gauges with the exception of the plugs 100 mm, which suffer from an apparent change in length during the circulation. With the linking, inconsistent results gave a number of 12 out of 119 independent results for the diameter and 1 out of 21 for roundness of the sphere. The comparison results help to support the calibration and measurement capabilities (CMCs) of the laboratories, while recommendations and actions were agreed with those having inconsistent results. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
This paper shows the result of work of the Institute of Micromechanics and Photonics at Warsaw Un... more This paper shows the result of work of the Institute of Micromechanics and Photonics at Warsaw University of Technology and the Length and Angle Division of Central Office of Measures (GUM) [1] in building an automatic multiwavelength interferometric system with extended measurement range for calibration of long (up to 1 m) gauge blocks. The design of a full working setup with environmental condition control and monitoring systems, as well as image analysis software, is presented. For length deviation determination the phase fraction approach is proposed and described. To confirm that the system is capable of calibrating gauge blocks with assumed accuracy, a comparison between the results of 300 mm length gauge block measurement obtained by using other systems from the Central Office of Measures is made. Statistical analysis proved that the system can be used for high precision measurements with assumed standard uncertainty (125 nm for a length of 1 m). Finally the comparison betwee...
The gauge block interferometer for long gauge blocks up to 500 mm, used for years in the Length L... more The gauge block interferometer for long gauge blocks up to 500 mm, used for years in the Length Laboratory of Length and Angle Division of GUM, was modernized. The measuring method used on the measuring set-up based on the interference in white light, was supplemented with the method of exact fractions based on laser light sources. The measurement of gauge blocks with the modernized set-up may be carried out using the method applied so far, which involves the use of the low coherence white light to detection of gauge block ends by interference and the measuring of the reference mirror displacement corresponding to the length of a gauge block measured by the Renishaw interferometer. After modernization the measurement with use of laser light interference is also possible. For the method of exact fractions, two stabilized He-Ne lasers with wavelengths of 633 nm and 543 nm are used as the standards. The main changes of the measuring system are related to providing a properly formed las...
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