News

Novel primary standard for measuring long distances

TeleYAG interferometric measurement head mounted on a geodetic pillar – Courtesy of PTB

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
2017 SIP call is now open
2017-07-25

EURAMET e.V. announces the launch of the EMPIR Call for Support for Impact. more

Improving radiotherapy success
2017-07-03

Innovative MRI-guided radiotherapy method rolled out for clinical use in EMPIR project - first patients treated in May 2017 more

Page 1 of 94.