2,108 Works

A8.2 - Parameter Free Model for Diagnosis and Behavior Simulation of Energy Storage Units

P. Büschel, T. Günther & O. Kanoun
For the characterization, simulation and diagnosis of batteries, different methods can be used. One approach is the separation of static and dynamic behavior, to analyze it separately and to combine them into one model. The dynamic behavior is often characterized by pulse tests and spectroscopic methods. The static behavior is determined by measuring the open circuit potential at different state of charge and temperature. To be useful in an application the measured behavior must be...

A8.1 - Water quality assessment by combining impedance spectroscopy measurement with cyclic voltammetry

R. Gruden & O. Kanoun
Optimum detergent dosage during a washing process depends on water quality, degree of pollution and quantity of laundry. Particularly, water quality is an important factor. Other parameters like carbonate- or non-carbonate hardness and calcium-magnesium ratio in addition to total hardness of water have an impact on the amount of detergent. This work discusses the possibilities to realize a detergent sensor which measures important parameters for the washing process and assess the ideal necessary amount of...

B6.1 - Function-Oriented Dimensional Metrology – More than Determining Size and Shape

W. Hartmann & A. Weckenmann
Today’s dimensional metrology has undergone some generational changes. Looking back in history, manufacturing functional products without metrology was just a trial and error procedure, so only a small number of simple products were produced. First, with the implementation of simple gage blocks the construction of complex buildings such as the pyramids were possible. Later, during the industrial revolution requirements for mass production increased, so simple 2-point measurements were no longer sufficient to ensure mating ability...

A7.4 - A high sensitivity analog and digital position sensor for the detection of ferromagnetic target in automotive applications

D. Frachon
This paper introduces a new sensor technology of analog or digital position sensor for the detection of a ferromagnetic target in rotary or linear motion. This sensor is based on the use of a permanent magnet exhibiting a specific shape; this magnet is associated to a conical ferromagnetic part. The presented sensor has an improved sensitivity due to the use of this conical ferromagnetic part (acting as a flux concentrator) associated to a permanent magnet.

B5.4 - Signal Processing for Single Transducer Distance Measurement Applications to Reduce the Blind Zone

A. Schröder & B. Henning
Piezoelectric air ultrasound transducers typically have a small bandwidth. So they cannot be used to transmit short signals. This leads to a blind zone which prevents measuring short distances in single transducer applications, because normally receiving is not possible until transmitting is finished. The blind zone is significantly increased if coded signals are used which is necessary to identify different sensors in a multi sensor environment to reduce crosstalk. One solution is to implement a...

A7.3 - Measurement System for the Characterization of Magnetic Actuators on the base of Magnetic Stray Fields

J. Franke, M. Brela & U. Pellkofer
Common defects in electromagnetic actuators due to the manufacturing process are heterogeneous magnetic properties of the materials, cracks and defects in the magnetic materials and parasitic air gaps in and directly around the magnetic circuit. Considering the high cost pressure, test systems must be adapted to the increasing complexity of the components and be able to detect defects completly in-situ. For these requirements the novel and non-destructive measurement system is suitable to monitor and assure...

B5.3 - A Novel Diagnostic- and Monitoring System for Technological Plasmas Based on the Concept of the Multipole Resonance Probe

T. Styrnoll, R. Storch, M. Lapke, J. Oberrath, C. Schulz, P. Awakowicz, R.-P. Brinkmann, T. Mussenbrock & I. Rolfes
Technological plasmas are inevitable in many industrial applications, especially for deposition of layers for high-precision optics or refining of surfaces. An outstanding part of current research is supervision and control of those plasma processes in an industrial environment. The multipole resonance probe (MRP) has already been proposed as a plasma diagnostic based on the idea of active resonance spectroscopy [1]. In this paper we present a complete system, which is able to generate spatially- and...

A7.2 - LinACE in-axis absolute linear encoder

M. Sivec
LinACETM is an extremely robust absolute linear cylindrical encoder system designed for integration into micro hydraulic, pneumatic and electromechanical actuators as a feedback element for position / velocity closed loop applications. The implementation of LinACE technology means progress from indirect position measurement done by a parallel encoder system to direct on-the-spot encoding by the novel in-axis absolute linear system. The LinACE encoder consists of a sliding encoder readhead module and a solid steel encoder shaft...

A7.1 - Large Area Magnetic Field Camera for Inline Magnet Inspection

K. Vervaeke
We report on further advancements in the field of magnetic field camera technology for magnet inspection, based on high resolution high speed two-dimensional magnetic field mapping of the magnetic field distribution of permanent magnets. The advancements presented here extend the applications of the technology to inspection of large magnets and magnets with non-planar geometries, such as rotary symmetric magnets (e.g. permanent magnet rotors or radially or diametrically magnetized cylinder or ring magnets for sensor applications....

B5.2 - Multi-sensor Systems for Safety-related Monitoring

M. Bartholmai, P. P. Neumann, H. Kohlhoff & W. Daum
The benefits of combining different types of sensors to multi-sensor systems should be demonstrated by means of three different examples of actual developments carried out by BAM Federal Institute for Materials Research and Testing: a micro-drone for gas measurement in hazardous scenarios, sensor enabled RFID tags for safeguard of dangerous goods, and a multifunctional sensor for spatially resolved under-surface monitoring of gas storage areas. Objective of the presented projects is to increase the personal and...

B5.1 - Radar Based Detection and Tracking of Objects under Poor Visibility Conditions

A. Ens, Ch. Zech, A. Hülsmann, L. Georgi & K.-F. Becker
Places which have to be monitored permanently (such as security sectors, industrial areas or power plants) are facing the problem of large-area monitoring. Optical security cameras can observe such areas under good lighting and visibility conditions, but objects might get invisible when fog, darkness or smoke reduces the visibility. This problem can be solved with millimeter-wave radars with very high slew rates of the chirp signal. The radar has a detection range of above 100...

A6.3 - Automated Non-Destructive Testing of Roller Bearings using GMR-Sensorarrays

M. Kreutzbruck, M. Pelkner, Th. Erthner & V. Reimund
Their small size together with a remarkable field sensitivity are the most prominent features of presentday GMR sensors paving the way for various applications in automated magnetic non-destructive testing (NDT). This work presents a prototype for fast and automated magnetic testing of roller bearings. A local magnetization unit excites the magnetic field inside the bearing. As a result of a design study and the following wafer fabrication the probe was equipped with NDT-adapted GMR sensor...

B4.4 - Mesoporous Al-doped SnO2 nanotubes with enhanced gas-sensing properties fabricated by electrospinning

J. Wu, S. Zhang & D. Zeng
Fabrication of metal-oxide nanotubes with quasi-one dimensional (Q1D) nanostructure is complex and expensive. In this work, mesoporous Al-doped SnO2 nanotubes were fabricated by a facile route of simple electrospinning. SEM and HRTEM characterizations of these nanotubes exhibited distinctive mesoporous hollow Q1D structure with 150 nm inner diameter and 250 nm outer diameter. The gas-sensing properties of the nanotubes with varying Al/Sn ratio were tested under variable temperature and formaldehyde (HCHO) concentration. At first, the gas-sensing...

B4.1 - Carbon-containing High Temperature Piezoresistive Materials

E. Ionescu, H.-J. Kleebe, K. Krause, N. Nicoloso, R. Riedel & L. Toma

A6.2 - Highly flexible absolute integrated encoder system on GMR-basis

B. Stritzke, Ch. Brode & M. Danowski
The cooperative project GMR-Flex is funded by the Federal Ministry of Education and Research (BMBF) within the support program “Microsystems 2004-2009”. The aim of the GMR-Flex project is the development of a GMR-based absolute rotary encoder system, which is flexibly scalable between module 0.2 and 4 and shaft diameters from 20 to 500 mm. One of the project’s primary objectives is an accuracy of 14 bits, which has solely been achieved by optical encoder systems...

A6.1 - Highly integrated magnetoresistive sensors in aerospace applications

R. Slatter
The usage of magnetic sensors is increasing steadily in the field of electric drives. Above all magnetoresistive (MR) sensors are experiencing a significant increase in applications in motion control and power electronics systems, not only in the industrial and automotive fields, but also in aerospace applications. MR sensors are not only used for measuring rotational and linear motion, but also for non-contact switching applications and furthermore for highly dynamic current measurement. This is largely the...

B3.4 - Hot Stamped Conductors on Nano-Micro Wires Made by Electroplating for Medical Sensors and Micro-Implants

T. Rossner, R. Sarwar, A. Lyashenko, E. Dörsam & R. Werthschützky
This paper presents a novel concept of hot stamped conductors on wires in a nano- or microscale. The process of producing arrays of wires selectively on the desired contact pad by electroplating of a template foil is described. The new concept provides electrical conductivity by penetration of wire arrays through the conductive layer of a hot stamping foil. Because of the small cross section of the wires, a large surface provides a low resistance between...

A5.4 - Clean or not clean - Detecting fouling in heat exchangers

E. Wallhäußer, M.A. Hussein & T. Becker
Fouling describes unwanted deposits on heat transferring surfaces leading to reduced heat transfer and increased heat transfer resistance. Hence, fouling is a severe issue particularly in food processing because product quality and safety cannot be ensured, and plant efficiency is reduced. As a result, cleaning is performed which limits processing time and increases plant downtime as well as costs because usually it cannot be adapted to amount and type of fouling present. Monitoring of cleaning...

B3.3 - Properties of a novel silver sintering die attach material for high temperature - high lifetime applications

S. Kraft, S. Zischler, N. Tham & A. Schletz
Silver sintering technology has proven to be a high reliable alternative for solder die attaches as well as wire bonding. Previous work at Fraunhofer IISB showed as well a rise in passive temperature cycling capability as in active temperature cycling lifetime with power electronic test modules compared to soldered and wire bonded samples. Since it is a new die attach technology, the material’s properties are still not yet well know. In this work, the Young’s...

A5.3 - Surface acoustic wave hybrid devices: High sensitivity conductivity probes and low-jitter single photon sources

H.J. Krenner, D. A. Fuhrmann, St. Völk, F. J. R. Schülein, F. Knall, J. Ebbecke & A. Wixforth
We employ surface acoustic waves to probe and manipulate optically active nanosystems. We demonstrate that the attenuation of a SAW provides a high sensitivity probe of the electrical conductivity by measuring the persistent photoconductivity in a multi quantum well structure. Moreover we apply SAW to dissociate photogenerated electron-hole pairs and by acoustic transport convey these at the speed of sound over macroscopic distances to a remote quantum emitter. After inherently sequential injection of electrons and...

B3.2 - A new packaging approach for reliable high temperature MEMS devices based on multilayer ceramic interposers

F. Roscher, A. Otto, R. Döring, S. Rzepka, M. Wiemer, M. Ihle & St. Ziesche
In this work, we will describe a promising procedure for the development of a silicon based micro electro mechanical system (MEMS) suitable for 300°C operation temperature. Design aspects as well as a suitable packaging concept and technology will be highlighted. The value of accompanying FEM simulations together with the usage of novel reliability tools will be demonstrated as a design and construction accelerator that can help to avoid typical mistakes within the material selection and...

A5.2 - Studies of Adsorption and Complexation of Copper and Lead with Environmental Relevance with an Electrochemical Quartz Crystal Nanobalance

M. T. S. R. Gomes, A. Yamasaki & J. A. B. P. Oliveira
Electrochemical methods when performed on an electrode of a piezoelectric quartz crystal can give extra information on mass deposited and stripped from the electrode. Current and mass give complementary information about the electrochemical phenomena. Reagent and products adsorption, as well as the importance of transport mechanisms as diffusion, can be easily perceived by following one or both variables. The examples here shown of voltammetric methods performed on copper and lead solutions, using one of the...

B3.1 - Assembly and Interconnection Technologies for Sensors for Very High Temperature Applications

J. Wilde, P. Wagner & R. Zeiser

A5.1 - Design Strategy for a New High-G Accelerometer

R. Kuells, S. Nau, Ch. Bohland, M. Salk & K. Thoma
A new piezoresistive high-g accelerometer is presented that was developed on the basis of an unconventional, displacement focused design approach. The approach analyses the “geometrical constant”, which describes the relation between the square of the resonant frequency and the displacement under static load of a spring-mass system. The value is maximized in order to achieve a high sensitivity, high bandwidth accelerometer. It has a figure of merit (sensitivity times resonant frequency squared) of about 5·106/m,...

A4.4 - An in situ impedance measurement set-up for high sound pressure levels

A. Grosso, E. Tijs & B. Zajamsek
In aerospace and related industries there is a request for acoustic impedance measurements under high sound pressure levels. Standard measurement techniques do not satisfy testing requirements or are sometime not applicable. In this paper a newly developed measurement system is introduced which can be used to measure materials properties under high sound pressure levels. The acoustic impedance can be measured in situ in a wide frequency range, from 100 Hz up to 8 kHz. From...

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