Abstract
Optical measurement systems are an important part of the portfolio of 3D topography sensors. By precise, contactless and rapid measurements these sensors constitute an alternative to tactile instruments. In this contribution the principle of a laser interferometric distance sensor is presented, which in combination with lateral scan axes acts as a topography sensor and also as distance sensor for the compensation of vibrations in a coherence scanning Linnik interferometer. An advantage of this distance sensor is its high acquisition rate of height values, which in case of working as a topography sensor enables high scan velocities as it is demonstrated at a chirp standard measured with a scan velocity of 80 mm/s. This is much higher than the scan velocity of tactile instruments, which are typically limited up to 1 mm/s. In addition, the compensation of vibration disturbances demonstrates the capability of the fast distance measurement.
In contrast to other existing high-speed point sensors the relevant components are mass products. This keeps the costs of the sensor setup in a limited range. Furthermore, the sensor shows potential of much higher measurement rates than 116 kHz provided by the sensor used here.
Zusammenfassung
Optische Messsysteme bilden einen wichtigen Bestandteil des Portfolios an 3D-Topographiesensoren. Durch präzise, berührungslose und schnelle Messungen stellen diese Sensoren eine Alternative zu taktilen Tastern dar. In diesem Beitrag wird das Prinzip eines laserinterferometrischen Abstandssensors vorgestellt, welcher in Kombination mit lateralen Scanachsen als Topographiesensor und ebenso als Abstandssensor zur Kompensation von Vibrationen in einem Linnik-Interferometer dient. Ein Vorteil dieses Abstandssensors ist seine hohe Erfassungsrate von Höhenwerten, welche beim Einsatz als Topographiesensor hohe Scangeschwindigkeiten ermöglicht, wie durch eine Messung an einem Chirpnormal mit einer Scangeschwindigkeit von 80 mm/s gezeigt wird. Diese liegt deutlich über der Scangeschwindigkeit von taktilen Tastschnittgeräten, welche typischerweise auf 1 mm/s begrenzt sind. Die Kompensation von Störschwingungen demonstriert zusätzlich die Möglichkeiten, die sich aus der schnellen Abstandsmessung ergeben.
Im Vergleich zu anderen existierenden Hochgeschwindigkeitspunktsensoren sind die relevanten Bauteile des Sensors Massenprodukte. Dies hält die Kosten des Sensors in engen Grenzen. Des Weiteren verfügt der hier präsentierte Sensor über Potenzial zur Erhöhung der Messdatenrate auf deutlich über 116 kHz.
About the authors
M.Sc. Sebastian Hagemeier is a research assistant in Measurement Technology Group of University of Kassel, Faculty of Electrical Engineering and Computer Science. Research interest: Multisensor measuring system for topography sensors, Fiber optic sensors, Coherence scanning interferometry (CSI).
Dr.-Ing. Stanislav Tereschenko is a research assistant in Measurement Technology Group of University of Kassel, Faculty of Electrical Engineering and Computer Science. Research interest: Coherence scanning interferometry (CSI), Vibration compensation in CSI, Signal processing in CSI and laser interferometry.
Prof. Dr.-Ing. habil. Peter Lehmann is head of the Measurement Technology Group of University of Kassel, Faculty of Electrical Engineering and Computer Science. Research interest: Optical metrology, Interferometry, Fiber optic sensors.
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