What is the right time - Contributions of the Physikalisch - Technischen Bundesanstalt (PTB)

September 14th, 16:30 – 17:30

In the 1930s the German ‚Institute for Standards‘ created high precision quartz clocks. For the first time this proved the variations in the earth’s rotation rate over the course of a year. Starting in the late 1960s, the PTB designed and built atomic clocks. Currently they use three types of atomic clocks: Primary Caesium Standard clocks, Caesium fountain clocks, and Optical clocks, which are basically stabilized lasers observing atomic transitions. Two fountain clocks provide the German national standard time. They are accurate to within a few one billionths of a second per year.

Andreas Bauch


 After studying Physics in Mainz, he joined the PTB in 1983 as a doctoral student. Up to 2002 he was a key contributor in improving caesium atomic clocks. Later his interests shifted toward their application and toward developing procedures to synchronize multiple atomic timekeeper across intercontinental distances. Since its inception he has contributed to the time standards of the European Galileo GPS system. Currently he leads the ‚Time transmission‘ team at the PTB.