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Adaptive Impedance Matching Network for Contactless Power and Data Transfer in E-Textiles

Lindeman, Pim (author), Steijlen, A.S.M. (author), Bastemeijer, J. (author), Bossche, A. (author)

One of the major challenges associated with e-textiles is the connection between flexible fabric-integrated wires and rigid electronics. This work aims to increase the user experience and mechanical reliability of these connections by foregoing conventional galvanic connections in favor of inductively coupled coils. The new design allows for...

journal article 2023

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Low-Cost Wearable Fluidic Sweat Collection Patch for Continuous Analyte Monitoring and Offline Analysis

Steijlen, A.S.M. (author), Jansen, K.M.B. (author), Bastemeijer, J. (author), French, P.J. (author), Bossche, A. (author)

Sweat sensors allow for new unobtrusive ways to continuously monitor an athlete's performance and health status. Significant advances have been made in the optimization of sensitivity, selectivity, and durability of electrochemical sweat sensors. However, comparing the in situ performance of these sensors in detail remains challenging because...

journal article 2022

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A New Approach for Monitoring Sweat Ammonia Levels Using a Ventilated Capsule

Steijlen, A.S.M. (author), Bastemeijer, J. (author), Nederhoff, R.J. (author), Jansen, K.M.B. (author), French, P.J. (author), Bossche, A. (author)

Ammonium levels in sweat can potentially be used to measure muscle fatigue and to diagnose particular metabolic myopathies. To research the potential use of ammonia in sweat as a biomarker, a new real-time monitoring system is developed. This system consists of a capsule that is placed on the skin and ventilated with dry air. A metal-oxide...

journal article 2021

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Smart sensor tights: Movement tracking of the lower limbs in football

Steijlen, A.S.M. (author), Burgers, D.B.J. (author), Wilmes, Erik (author), Bastemeijer, J. (author), Bastiaansen, Bram J.C. (author), French, P.J. (author), Bossche, A. (author), Jansen, K.M.B. (author)

This article presents a novel smart sensor garment with integrated miniaturized inertial measurements units (IMUs) that can be used to monitor lower body kinematics during daily training activities, without the need of extensive technical assistance throughout the measurements. The smart sensor tights enclose five ultra-light sensor modules that...

journal article 2021

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Development of Sensor Tights with Integrated Inertial Measurement Units for Injury Prevention in Football

Steijlen, A.S.M. (author), Bastemeijer, J. (author), Plaude, L. (author), French, P.J. (author), Bossche, A. (author), Jansen, K.M.B. (author)

In elite European football, 6 to 7 hamstring muscle injuries occur per team per season, which results in an absence of 14 to 180 days (Ekstrand et al. 2017). These injuries occur typically in the last part of a training or match. This implies that the accumulation of demanding actions is an important factor for hamstring injury risk. In current...

conference paper 2020

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A wearable fluidic collection patch and ion chromatography method for sweat electrolyte monitoring during exercise

Steijlen, A.S.M. (author), Bastemeijer, J. (author), Groen, Pim (author), Jansen, K.M.B. (author), French, P.J. (author), Bossche, A. (author)

This paper presents a method to continuously collect and reliably measure sweat analyte concentrations during exercise. The method can be used to validate newly developed sweat sensors and to obtain insight into intraindividual variations of sweat analytes in athletes. First, a novel design of a sweat collection system is created. The sweat...

journal article 2020

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A novel sweat rate and conductivity sensor patch made with low-cost fabrication techniques

Steijlen, A.S.M. (author), Bastemeijer, J. (author), Jansen, K.M.B. (author), French, P.J. (author), Bossche, A. (author)

Sweat sensor patches offer new opportunities for unobtrusive monitoring of an athlete’s physical status. This paper presents a novel sweat rate and sweat conductivity patch that is easy to prototype and can be made with common low-cost production techniques: laser cutting and standard printed circuit board (PCB) manufacturing. The device...

conference paper 2020

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Development of a microfluidic collection system to measure electrolyte variations in sweat during exercise

Steijlen, A.S.M. (author), Bastemeijer, J. (author), Groen, W.A. (author), Jansen, K.M.B. (author), French, P.J. (author), Bossche, A. (author)

A wide variety of electrochemical sweat sensors are recently being developed for real-time monitoring of biomarkers. However, from a physiological perspective, little is known about how sweat biomarkers change over time. This paper presents a method to collect and analyze sweat to identify inter and intraindividual variations of electrolytes...

conference paper 2020

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Analysing sweat to determine internal training load during an incremental exercise

Thomas, Miguel (author), Bossche, A. (author), Groen, W.A. (author), Bastemeijer, J. (author), Steijlen, A.S.M. (author), French, P.J. (author)

Sweating is a normal reaction of the body to exercise. Although much of sweat is water, there are many other components. These components can be an indication of the condition of the athlete. Increase of elements and salts in the tissue will also work their way through to the sweat. Measurement directly in tissue can be an excellent indicator,...

conference paper 2019

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A Low-Power MEMS IDE Capacitor with Integrated Microhotplate: Application as Methanol Sensor using a Metal-Organic Framework Coating as Affinity Layer

Ramachandrappa Venkatesh, M. (author), Sachdeva, S. (author), El Mansouri, B. (author), Wei, J. (author), Bossche, A. (author), Bosma, D. (author), de Smet, L.C.P.M. (author), Sudhölter, Ernst J. R. (author), Zhang, Kouchi (author)

Capacitors made of interdigitated electrodes (IDEs) as a transducer platform for the sensing of volatile organic compounds (VOCs) have advantages due to their lower power operation and fabrication using standard micro-fabrication techniques. Integrating a micro-electromechanical system (MEMS), such as a microhotplate with IDE capacitor,...

journal article 2019

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Microstructure for Thermal Impedance Spectroscopy for Biofuel Composition Measurement

Jiang, Bo (author), Ghaderi, M. (author), Bossche, A. (author), Visser, Jaco H. (author), Wolffenbuttel, R.F. (author)

Thermal impedance spectroscopy has been investigated as a non-destructive technique to determine the composition of ternary mixtures of biofuels. The principle of the thermal conductivity detector has been extended for measuring both the thermal conductivity and the thermal capacity of biofuel in the range between 1 to 100 Hz, using an AC...

conference paper 2017

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Combining impedance spectroscopy with optical absorption spectroscopy in the UV for biofuel composition measurement

Middelburg, L.M. (author), Ghaderi, M. (author), Bossche, A. (author), Bastemeijer, J. (author), de Graaf, G. (author), Wolffenbuttel, R.F. (author), Soltis, Rick (author), Visser, Jaco (author)

A capacitive probe is generally used in a flex-fuel engine for measuring the ethanol content in biofuel. However, the water content in biofuel of high ethanol content cannot be disregarded or considered constant and the full composition measurement of ethanol, gasoline and water in biofuel is required. Electrical impedance spectroscopy with a...

conference paper 2017

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Multi-domain spectroscopy for composition measurement of water-containing bio-ethanol fuel

Middelburg, L.M. (author), de Graaf, G. (author), Bossche, A. (author), Bastemeijer, J. (author), Ghaderi, M. (author), Wolffenbuttel, F.S. (author), Visser, J. (author), Soltis, R. (author), Wolffenbuttel, R.F. (author)

Measuring the ethanol/water ratio in biofuel of high ethanol content, such as E85, is important when used in a flex-fuel engine. A capacitive probe is generally used for measuring the ethanol/gasoline ratio. However, the water content in E85 biofuel cannot be disregarded or considered constant and full composition measurement of biofuel is...

journal article 2017

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Optical Spectroscopy for Biofuel Composition Sensing

Middelburg, L.M. (author), de Graaf, G. (author), Ghaderi, M. (author), Bossche, A. (author), Bastemeijer, J. (author), Visser, J.H. (author), Soltis, R.E. (author), Wolffenbuttel, R.F. (author)

The optical absorption of water-containing bio-fuel is investigated as a parameter to determine the gasoline content of this fuel. Optical measurements reveal that gasoline shows an interesting and useful spectrum with typical absorption behavior in the UV range between 230 and 300 nm. This result indicates that significant information can be...

journal article 2016

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Low-Cost Technology for the Integration of Micro- and Nanochips into Fluidic Systems on Printed Circuit Board: Fabrication Challenges

Palacios-Aguilera, N.B. (author), Bastemeijer, J. (author), Mollinger, J.R. (author), Bossche, A. (author), Mokkapati, V.R.S.S. (author), Visser, H.A. (author), Akkerman, R. (author)

Nowadays, micro- and nanochips are usually fabricated with Silicon and/or glass. A simple, low-cost and reliable integration packaging method that provides flexibility to the incorporation of electronic and fluidic devices into a system has not been fully developed yet. The use of Printed Circuit Board material as substrate to create dry film...

journal article 2012

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Method for determining a spring constant for a deformable scanning probe microscope element, and scanning probe microscope and calibration device arranged for determining a spring constant for a probe element

Sadeghian, H. (author), Yang, C.K. (author), Bossche, A. (author), French, P.J. (author), Goosen, J.F.L. (author), Van Keulen, A. (author)

A method for determining a spring constant k for a deformable probe element (102) of a scanning probe microscope SPM (100). The probe (102) has an outer surface area consisting of a tip area (112) on a first probe side (108) and a tip-less area (113). The probe (102) also has a probe electrode (114) and a scanning probe tip (104) in the tip area...

patent 2012

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On the size-dependent elasticity of silicon nanocantilevers: Impact of defects

Sadeghian, H. (author), Goosen, H. (author), Bossche, A. (author), Thijsse, B. (author), Van Keulen, F. (author)

Recent measurements have indicated that the elastic behaviour of silicon nanocantilevers and nanowires is size-dependent. Several theoretical models have been proposed to explain this phenomenon, mainly focused on surface stress effects. However, discrepancies are found between experiments and theories, indicating that there could be other...

journal article 2011

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Some considerations of effects-induced errors in resonant cantilevers with the laser deflection method

Sadeghian, H. (author), Yang, C.K. (author), Gavan, K.B. (author), Goosen, J.F.L. (author), Van der Drift, E.W.J.M. (author), Van der Zant, H.S.J. (author), Bossche, A. (author), French, P.J. (author), Van Keulen, F. (author)

Micro/nano resonant cantilevers with a laser deflection readout have been very popular in sensing applications over the past years. Despite the popularity, however, most of the research has been devoted to increasing the sensitivity, and very little attention has been focused on effects-induced errors. Among these effects, the surface effects...

journal article 2010

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Effects of size and defects on the elasticity of silicon nanocantilevers

Sadeghian, H. (author), Yang, C.K. (author), Goosen, J.F.L. (author), Bossche, A. (author), Staufer, U. (author), French, P.J. (author), Van Keulen, F. (author)

The size-dependent elastic behavior of silicon nanocantilevers and nanowires, specifically the effective Young’s modulus, has been determined by experimental measurements and theoretical investigations. The size dependence becomes more significant as the devices scale down from micro- to nano-dimensions, which has mainly been attributed to...

journal article 2010

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Surface stress-induced change in overall elastic behavior and self-bending of ultrathin cantilever plates

Sadeghian, H. (author), Goosen, J.F.L. (author), Bossche, A. (author), Van Keulen, F. (author)

In this letter, the dominant role of surface stress and surface elasticity on the overall elastic behavior of ultrathin cantilever plates is studied. A general framework based on two-dimensional plane-stress analysis is presented. Because of either surface reconstruction or molecular adsorption, there exists a surface stress and a surface...

journal article 2009