Metrological Instrumentation

Focus Field: Industrial Metrology

Detector-Based Traceability Chain for Spectral Irradiance using Tunable Laser-Based Facility at PTB

Focus: 
Metrological Instrumentation

A new setup for a detector-based traceability chain for spectral irradiance measurements, independent from the high-temperature blackbody radiator and synchrotron radiation, has been developed at the Physikalisch-Technische Bundesanstalt (PTB). Thus a SI traceability of the spectral irradiance is obtained without any use of calculable radiant sources.

Mentor/s: 
Hangleiter
Mentor/s: 
Kück
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Abd ElMageed

Terahertz-Mikroskopie mit supraleitenden Josephson-Cantilevern und optisch gepumptem Ferninfrarot-Gaslasersystem

Focus: 
Metrological Instrumentation

THz microscopy with superconducting Josephson cantilevers and optically pumped far-infrared gas laser system

Mentor/s: 
Schilling
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Brendel

High Accuracy Measurements of Standard Reflection Materials and Goniochromatic Effect Pigments

Focus: 
Metrological Instrumentation

The basis for the description of diffuse reflecting materials is the concept of the radiance factor or as a quite similar depiction the bi-directional distribution function (BRDF). Both characterisations use the concept of the perfectly reflecting diffuser (PRD), which reflects by definition the incoming radiation loss-free, completely diffuse and with a Lambertian direction characteristics. The PRD is a theoretical concept only, which cannot be realised materially. Since there is no material with these characteristics, the realisation is carried out with physical methods, i.e.

Mentor/s: 
Kück
Institution: 
PTB
Status: 
completed
Ph.D. student: 
Wiegner (née Atamas)

Confocal THz Laser Microscope

Focus: 
Metrological Instrumentation

The terahertz (THz) range refers to frequencies between 0.1 and 10 THz and represents the spectral gap between the microwave and infrared region. Over the past few years, there has been a significant interest in employing THz technology in spectroscopy, imaging, and recently in short-range communication systems.

Mentor/s: 
Koch
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Salhi

Micro Coordinate Measuring Machine for Parallel Measurement of Microstructures

Focus: 
Metrological Instrumentation

This project deals with the development of a coordinate measuring machine for parallel tactile probing of microstructures. The particular challenges due to the parallel probing will be discussed and the concluding results regarding the construction, the control and the simulation environment will be outlined.

Mentor/s: 
Tutsch
Institution: 
Braunschweig IGSM
Status: 
completed
Ph.D. student: 
Schrader

Towards the Implementation of the Concept of Visual Appearance in Reflectometry

Focus: 
Metrological Instrumentation

Visual appearance is the superordinate concept for effects of colour respectively colour change, gloss, haze, orange peel, texture, transparency etc. All these effects look different for different observers, depending on the illumination with sunlight or artificial light, especially with the increasing importance of LED-sources for illumination purposes and the angle between illumination, sample and observer. Furthermore the industrial importance of e.g. multi colour lacquering, textures etc. especially in the automotive industry is rapidly increasing.

Mentor/s: 
Kück
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Häkkinen (née Holopainen)

Advanced methods in measurement of the noise of fluxgate sensors

Focus: 
Metrological Instrumentation

Fluxgate-sensors still are the best peforming room-temperature vectorial magnetic sensors in the nT-mT range. Multiple applications (i.e. medical imaging and scanning, space instrumentiation), require the knowledge of the noise properties of the respective sensor, or generally of the whole magnetometer. As other magnetic sensors do, fluxgates exhibit 1/f noise behaviour, which is well documented in the common range of 0.1-10 Hz and they reach a PSD of units of pT(rms) @ 1 Hz.

Mentor/s: 
Ripka
Mentor/s: 
Schilling
Institution: 
TU Braunschweig
Institution: 
External
Status: 
completed
Ph.D. student: 
Janošek

Position determination of multi-coordinate drives with large work space

Focus: 
Metrological Instrumentation

The most existing multi-coordinate drives were developed for relatively high-precision applications with small moving ranges such as semiconductor manufacturing systems, machining tools, laser-cutting systems and others. In such drives optical measuring systems, such as laser interferometer or optical incremental measuring systems are applied.

Mentor/s: 
Wendt
Mentor/s: 
Zentner
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
discontinued
Ph.D. student: 
Galovskyi

Examination of Mechanical Stresses in Sensor Devices Induced by the Molding Process

Focus: 
Metrological Instrumentation

The reliability of sensor devices is particularly determined by mechanical stress due to encapsulation. In this thesis an X-ray diffractometer has been realised, that allows the three-dimensional stress state to be analysed in the single crystal silicon substrate of encapsulated chips. This requires different innovative aspects to be developed and approached. Only hard X-rays (>15 keV) can penetrate through the injection molding. Because of the special sample geometry only high order Bragg reflections are available.

Mentor/s: 
Göbel
Mentor/s: 
Hangleiter
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Friedrich

Generation, detection and coherent control of purely optically generated current pulses

Focus: 
Metrological Instrumentation

In the last few years, the terahertz (THz) frequency range has enjoyed increasing interest. A multitude of applications have been discussed for THz systems, ranging from medical diagnostics and security applications to industrial control processes. In these application fields, THz imaging techniques stand at the focus of current interest. In addition, "in-door" communication with THz waves promises to be a mass-market by 2015.

Mentor/s: 
Bieler
Mentor/s: 
Koch
Mentor/s: 
Siegner
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Priyadarshi
Syndicate content