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[Translate to English:] Großringlaser


The first system, the large ring laser, was presented to us by Dr. Thomas Klügel. Ring laser allow recording the Earth’s rotational speed. The principle of such a laser is based on the so called “effect of Sagnac”. If light, deflected by mirrors revolves an area in a resting system clockwise and counter clockwise, the travel time is identical in both directions. But if the whole system is spinning, the travel time of this light is longer which is travelling in the same direction like the rotation; the travel time of the light travelling the other direction is shorter. This effect can be observed in a form of a beat frequency by overlaying both travelling direction of the light. On the rotating Earth, a laser gyro is a local sensor for the Earth rotation, neither dependent on the observed objects, nor global observation networks. The main advantage of a laser gyro for detecting the Earth rotation is seen in the chronological higher resolution compared to the previously used systems. The results of the laser can be observed locally and be published almost in real-time. The construction of the large ring laser “G” (stands for Großringlaser) began in 1999. The ring laser, which spans an area of 4 m by 4 m, is located in a subterraneous laboratory. Only under these conditions, constant temperatures and best possible shielding from exterior influences can be guarantied. After three years of construction, the measuring mode started by the end of 2001. With the help of the ring laser, diurnal motions of the pole of a few centimetres, which had been predictable only theoretically, could be proofed for the first time in reality.

 superconducting gravimeter
 permanent GNSS receiver
 20 m radio telescope
 WLRS (Wettzell Laser Ranging System)
 time and frequency system  homepage of the excursion

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