Metrology - Photonik

Wavefront-based alignment:  properties and precision
Bild: Fraunhofer IPT

Metrology

Wavefront-based alignment: properties and precision

Wavefront-based alignment is an elegant approach to high-precision positioning. The system status can be evaluated in one single measuring operation and suitable correction actions can be derived. mehr

Optical vibration measurement using laser Doppler vibrometry
Bild: Polytec

Metrology

Optical vibration measurement using laser Doppler vibrometry

Understanding vibrating systems in nature and technology requires sophisticated, flexible, and ideally non-invasive measurement tools. Here, non-contact laser vibrometry proves to be the highest performing method. mehr

BioLayer Interferometry for label-free protein analysis
Bild: Pall Life Sciences

Metrology

BioLayer Interferometry for label-free protein analysis

BioLayer Interferometry for label-free real-time analysis of biomolecular interactions is increasingly establishing itself in the biopharmaceutical drug development and manufacturing sectors. mehr

High-speed 3D measurements
Bild: Fraunhofer IOF

Metrology

High-speed 3D measurements

Using the GOBO (GOes Before Optics) projection principle, a system for the fast recording of 3D data has been developed. mehr

Precise color recognition under industrial operating conditions
Bild: Hochschule Wismar, Astech GmbH

Metrology

Precise color recognition under industrial operating conditions

Color recognition is a well-established method for automatization of industrial processes. Optical sensors therefor must comply with particular requirements. mehr

Multi sensor systems for dimensional quality inspection
Bild: ZEISS

Metrology

Multi sensor systems for dimensional quality inspection

Measuring technology in manufacturing based on combination of optical and contact sensors offer increased speed and flexibility mehr

Absorption measurement in optical components
Bild: REO

Metrology

Absorption measurement in optical components

Appropriate measuring techniques are important for optical manufacturers to provide precise feedback for process control mehr

An excursion into laser power measurement
Bild: Artifex

Metrology

An excursion into laser power measurement

Sensors for laser power measurement are based on various physical effects, each having advantages and disadvantages. The following article describes various systems that are suitable for such measurements. mehr

Auxiliary photometer method for goniophotometric measurements
Bild: Instrument Systems

Metrology

Auxiliary photometer method for goniophotometric measurements

Auxiliary photometer correction method complies with CIE S025 and puts minimal requirements concerning budget and test room dimensions mehr

Calibrated detectors for broad-band terahertz power measurements
Bild: A. Steiger, PTB Berlin

Metrology

Calibrated detectors for broad-band terahertz power measurements

New pyroelectric detectors cover the frequency range from 50 GHz up to 5 THz. Their power responsivity can be determined with low uncertainty. The wavelength independent absorption of these detectors enables their accurate calibration and thus precise terahertz measurements at µW and mW power levels. mehr

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