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In cooperation with the University of Oxford etalon , Braunschweig has developed the procedure Absolute Multiline for the precision measurement of lengths up to 20 m. It should combine the advantages of an interferometer ( high resolution, good metrological traceability ) with which absolute measurements systems. Unlike conventional interferometers , the laser beam can be interrupted with the new technology according to the manufacturer at any time , without loss of precision occurs.
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Integrated in a large machine tool, the technique can continuously monitor the calibration of the machine and initiate compensation if necessary measures to ensure the dimensional stability of the components. The automated metrological monitoring of robots using reference lines is possible. In addition, the method can be used as a metrology system for the control of the entire inline measurement technology of a production hall . Similarly, the geometric long-term monitoring of the dimensional stability of devices as well as the detection of deformations and vibrations ( thermo- ) mechanical systems such as generators, turbines, pressure vessels are conceivable.
The metrological traceability is assured by reference to a basic physical constant: For each measurement, the molecular absorption spectrum of a gas cell is sampled , which is stable over decades and calibrated the system at each measurement automatically. Comparative measurements with a conventional interferometer yielded a measurement uncertainty of 0.5 ppm ( 0.5 microns / m) at distances of 0.2 to 20 m.
Depending on requirements, the measuring systems with eight channels to 100 compact measuring equip . A single sensor consisting of a conventional glass fiber, and a robust appearance without miniaturized electronic components. Each channel can detect movement and vibration of the object to be measured with a time resolution of about 500 kHz. The distance between the sensor and evaluation unit can be several kilometers , so measurements can be far away from the transmitter.