The gateway to Europe's
integrated metrology community.

News

Novel primary standard for measuring long distances

TeleYAG interferometric measurement head mounted on a geodetic pillar

PTB develops primary standard capable of measuring distances up to 1 km with sub-millimetre accuracy

As part of EMRP project Metrology for long distance surveying (SIB60 Surveying), a novel primary standard for the calibration of geodetic reference baselines was developed by PTB. The TeleYAG system is capable of measuring distances up to 1 km optically with sub-millimetre accuracy. Aside from a measurement of humidity, the device does not require information from auxiliary sensor systems like a temperature sensor network. 

The device was successfully demonstrated in a verification experiment performed at one of the best reference baselines in Nummela, Finland. The device offers, for the first time, high-accuracy traceability to the SI definition of the metre for the most common verification approach used by surveyors worldwide.

Select your area of interest
Image showing a Large Modern Hourglass
Hourglass, an early timekeeping device
Optical clock comparison shows new high accuracy, resulting in a Nature paper
2019-11-05

A recently completed EMPIR project confirms unprecedented ultra-low deviation between two independent single-ion optical clocks more

Image showing a close up of a camera lens
Aspheres and freeform surfaces are components used in a variety of optical systems
EMPIR optical project consortium to present at major international conference
2019-10-31

ASPEN 2019: 8th International Conference of Asian Society for precision Engineering and Technology, Japan, 12 – 15 November more

Image showing rows of yellow radioactive waste barrels
Barrels of radioactive waste
EMPIR environment project collects and evaluates data on radioactive waste
2019-10-30

Activities to support the development of a good practice guide on measurements for radioactive waste has begun in CIEMAT Spain more

Page 88 of 227.