Compact interferometers, called phasemeters, make it possible to operate over a large
range while ensuring a high resolution. Such performance is required for the stabilization of …

Abstract The revised International System of Units (SI) came into force on May 20, 2019.
Simultaneously, updated versions of supporting documents for the practical realization of the …

Precision positioning of an object relative to a reference point is a common task in many
activities of production engineering. Sensor technologies for single axis measurement …

A precision PGC demodulation for homodyne interferometer modulated with a combined
sinusoidal and triangular signal is proposed. Using a triangular signal as additional …

To date, there have been few dynamic measurements of gravitation in the laboratory, and
fully controlled quantitative experiments have been limited to frequencies in the millihertz …

The PTB developed a new optical heterodyne interferometer in the context of the European
joint research project'Nanotrace'. A new optical concept using plane-parallel plates and …

The 2019 revision of the International System of Units (SI) linked the seven base units to
fundamental constants; only a minor rewording was necessary for the metre whose …

In order to be able to resolve displacements of a picometer with widely used commercially
available heterodyne interferometers, an advanced phase meter was developed at PTB. Key …

We report on a comparison between piezoelectric and interferometric readouts of vibrations
in quartz tuning forks (QTFs) when acting as sound wave transducers in a quartz-enhanced …

This paper discusses the generation of a novel periodic nonlinear error in homodyne
interferometers due to geometric misalignments. These misalignments arise from cumulative …