Atomic clock - always the exact time!

The Atomic Clock in Braunschweig The atomic clock in Germany is one of the most precise clocks in the world and plays an important role in timekeeping and synchronization. Here is some key information about it: Physikalisch-Technische Bundesanstalt (PTB) The central institution for timekeeping in Germany is the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. The PTB operates several atomic clocks, including caesium and hydrogen maser clocks, as well as the optical strontium clock, which is among the most accurate in the world. How an Atomic Clock Works Atomic clocks are based on the oscillation of atoms, usually caesium-133. A caesium atom oscillates at a frequency of exactly 9,192,631,770 oscillations per second. This frequency is used to define the second. Modern atomic clocks, such as optical strontium clocks, use strontium atoms and achieve even greater accuracy. Importance and Applications

1. Time standard: The PTB provides the legal time standard for Germany, which is crucial for numerous applications.
2. GPS and navigation: Precise timekeeping is essential for GPS systems, as the accuracy of positioning depends directly on the accuracy of time measurement.
3. Telecommunications: Many communication systems require synchronized timekeeping for data transmission.
4. Scientific research: Atomic clocks enable precise measurements in physics and astronomy.

International cooperation The PTB works with international organizations such as the International Bureau of Weights and Measures (BIPM) to coordinate global time standards. PTB time data is incorporated into the calculation of International Atomic Time (TAI) and Coordinated Universal Time (UTC). Innovations and the Future The development of new technologies, such as optical clocks, has the potential to further improve the accuracy of timekeeping. In the future, these innovations could enable even more precise applications and deepen our understanding of fundamental physical processes. The PTB's atomic clocks are therefore an essential part of modern timekeeping and play a crucial role in many areas of our daily

Atomic Clock FAQ

How does an atomic clock work? An atomic clock measures time through the oscillations of atoms, typically caesium or rubidium atoms. In a caesium atomic clock, a beam of caesium-133 atoms is passed through a magnetic field. These atoms are stimulated by microwave radiation to switch from one energy state to another. The frequency of this radiation (9,192,631,770 Hz) is very constant and serves as the clock's timekeeping signal. A rubidium atomic clock works similarly, but uses rubidium-87 atoms. Why is it called an atomic clock? It is called an atomic clock because it is based on the atomic transitions (oscillations) of atoms to measure time. The stability of these oscillations makes it extremely precise. Why are there atomic clocks? Atomic clocks exist because they provide an extremely precise and stable method of timekeeping. They are used in many fields, including GPS, telecommunications, science, and international time standards. How much does an atomic clock cost? The cost of atomic clocks varies greatly. Simple rubidium atomic clocks can cost a few thousand euros, while highly precise caesium atomic clocks can cost several tens of thousands to hundreds of thousands of euros. Very specialized and ultra-precise atomic clocks can cost millions. How many atomic clocks are there in Germany? There is no exact number, but there are numerous atomic clocks in Germany used in research institutions, universities, laboratories, and industry. The Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig operates some of the most accurate atomic clocks in Germany. Where is the most accurate atomic clock in the world? The most accurate atomic clock in the world is often located at research institutions such as the National Institute of Standards and Technology (NIST) in the USA or at the PTB in Germany. One of the most accurate atomic clocks currently is the optical lattice clock at NIST. How large is the atomic clock? The size of an atomic clock varies. Simple atomic clocks can be about the size of a shoebox, while highly precise laboratory atomic clocks can be several meters in size because they contain complex laser and vacuum apparatus. Is an atomic clock radioactive? No, atomic clocks are not radioactive. They are based on the oscillations of atoms, but these oscillations are not connected with radioactive decay. Who invented the first atomic clock? The first working atomic clock was developed in 1949 by the National Bureau of Standards (now NIST) in the USA. In 1955, the British physicist Louis Essen improved the accuracy and stability of atomic clocks through the introduction of the caesium atomic clock. What are atomic clocks made of? Atomic clocks consist of various components:

• Atom source: E.g. caesium or rubidium atoms.
• Resonance chamber: This is where the atoms are stimulated by microwave radiation.
• Magnetic fields and lasers: For sorting and stimulating the atoms.
• Detectors: For measuring the transition frequencies.
• Electronics: For controlling and evaluating the measurements and generating the time signal.

These components work together to enable extremely precise timekeeping.