CFMCW - Coherent Frequency Modulated Continuous Wave Absolute Distance Meter

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Research unit

INNOSUISSE

Project number

8348.2;7 NMPP-NM

Project title

CFMCW - Coherent Frequency Modulated Continuous Wave Absolute Distance Meter

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Short description (English)	CFMCW - Coherent Frequency Modulated Continuous Wave Absolute Distance Meter
Abstract (English)	The project CFMCW deals with the development of an absolute distance meter for industrial application such as coordinate measurement machines (CMM) and laser scanners. These applications are characterized by extreme requirements on measurement accuracy ( �� 100ìm), and measurement range (up to 100m). They ideally operate both on cooperative and non-cooperative targets with measurement rates that are suitable for object scanning. Todays interferometric methods can in principle fulfill these needs. In practice, the available systems are often limited by non-idealities of the laser source, and much effort has therefore been put into enhancing the performance thereof. In this project, a different approach shall be pursued: Rather than modifying the laser source, algorithmic measures are taken to measure and compensate for the major laser non-idealities, such as phase-noise or tuning-nonlinearities, in the detection process. As a benefit, we expect major reductions in system complexity and cost.

Category

Text

Short description
(English)

CFMCW - Coherent Frequency Modulated Continuous Wave Absolute Distance Meter

Abstract
(English)

The project CFMCW deals with the development of an absolute distance meter for industrial application such as coordinate measurement machines (CMM) and laser scanners. These applications are characterized by extreme requirements on measurement accuracy ( �� 100ìm), and measurement range (up to 100m). They ideally operate both on cooperative and non-cooperative targets with measurement rates that are suitable for object scanning. Todays interferometric methods can in principle fulfill these needs. In practice, the available systems are often limited by non-idealities of the laser source, and much effort has therefore been put into enhancing the performance thereof. In this project, a different approach shall be pursued: Rather than modifying the laser source, algorithmic measures are taken to measure and compensate for the major laser non-idealities, such as phase-noise or tuning-nonlinearities, in the detection process. As a benefit, we expect major reductions in system complexity and cost.