Miniaturized liquid sensors are essential devices in online process or condition monitoring. In case of viscosity and density sensing, microacoustic such as quartz crystal resonators SAW have proved particularly useful. However, these basically measure a thin‐film viscosity, which is often not comparable to the macroscopic parameters probed by conventional viscometers. cantilever‐based interesting alternatives for applications, but here interaction between oscillating beam more involved. our...

Abstract Due to the necessary transition renewable energy, transport of electricity over long distances will become increasingly important, since sites sustainable generation, such as wind or solar power parks, and place consumption can be very far apart. Currently, is mainly transported via overhead AC lines. However, studies have shown that for distances, DC offers decisive advantages. To make optimal use existing route infrastructure, simultaneous DC, hybrid transmission, should employed....

Miniaturized viscosity sensors are often characterized by high-resonance frequencies and low-vibration amplitudes. The parameter obtained such devices is therefore not always comparable to those probed conventional laboratory equipment. We present a novel micromachined sensor with relatively low operating in the kHz range. utilizes Lorentz force excitation piezoresistive readout. resonating part consists of rectangular plate suspended four beam springs. first mode vibration an in-plane mode....

For vibration and displacement sensors, robustness is one of the key requirements. Optical measurement concepts are among most promising possibilities to achieve it. The presented microoptoelectromechanical system sensor modulates a light flux by means two congruently placed aperture gratings: etched into seismic mass other fixed package. Commercially available LED photodetector components at top bottom sandwich structure generate detect this modulated allow for cost-effective...

A sensor suitable for online monitoring of viscosity and density glycerol–water mixtures is presented. The device based on Lorentz force excitation features an integrated piezoresistive readout. core sensing element a rectangular vibrating plate suspended by four beam springs. Two the plate-carrying springs comprise piezoresistors. With two additional resistors silicon rim they form half Wheatstone-bridge. Through conductive layer sinusoidal current driven. In field permanent magnet, excites...

We present a dark-field video microscopy setup and microfluidic sample cell to detect suspended particles measure their size. The chip was fabricated by etching of shallow chambers in silicon bonding with glass, thus achieving robust devices low background signal for microscopy. system is suitable measuring liquid media, such as metallic wear originating from lubricated tribocontacts oil. Here, were generated the laboratory sliding piston ring section against cylinder liner reciprocating...

A smart system for flow measurement is presented, consisting of a micromachined thermal sensor combined with front-end electronic interface. The based on novel transduction method, which combines the hot-film and calorimetric sensing principles. consists four germanium thermistors embedded in thin membrane connected to form Wheatstone bridge supplied constant DC current. In this configuration, both unbalance voltage at supply terminals are functions offering high initial sensitivity, i.e.,...

Increasing demands for online monitoring of liquids have not only resuted in many new devices relying on well-established sensing parameters like shear viscosity but also initiated research alternative parameters. Recently, the longitudinal has been evaluated as a promising candidate because arising enable bulk liquid to be probed rather than thin surface layer. We report multi-purpose sensor which allows simultaneous measurement sound velocity and liquids. The device embodiment features...

This work presents a novel air flow sensor for measuring velocities in heating, ventilating, and conditioning systems. The transducer relies on printed circuit board technology allowing the fabrication of robust, design flexible, cost-effective devices. Due to interaction with streaming fluid, generates an electrically measurable signal determination total fluid. measurement principle is based modified calorimetric where heater excited through DC current sensing resistors are sine. Guided by...

For the first time we demonstrate a microfluidic platform for preparation of biosensing hydrogels by in situ polymerization polyethyleneglycol diacrylate (PEG-DA) single step. Capillary pressure barriers enable precise formation gel microstructures fast molecule diffusion. Parallel arrangement these finger structures allows macroscopic and standard equipment readout methods. The analyte automatically fills space between fingers hydrophilic nature gel. Introducing functional chip fabrication...

We present Brownian motion-based sizing of individual submicron and nanoparticles in liquid samples. The advantage our approach is that particles can freely diffuse a 10 μm thin film are therefore always within the focal depth low numerical aperture objective. Particles visualized with dark-field microscopy, resulting diffraction-limited spots tracked over wide field view several hundred micrometers. Consequently, it ascertained long 2D trajectories acquired, which leads to significantly...

In this contribution we demonstrate the feasibility of a sensor system for viscosity and concentration measurement complex liquids, in particular suspensions silicon dioxide particles water. The is based on doubly clamped micromachined beam vibrating sample liquid, an optical readout utilizing DVD player pickup head. features resonance frequencies range several 10 kHz, higher mechanical amplitudes than microacoustic sensors, e.g., quartz thickness shear mode (TSM) resonators or surface...

This paper presents encouraging results of a novel optoelectronic conversion method for relative displacement. An optical modulator responding to acceleration and gravitation is used characterization. The Si microelectromechanical system (MEMS) component comprise spring suspended, in-plane oscillating mass carrying an array apertures. Light flux modulation achieved with second complementary apertures that fixed the frame. investigated device comprises sandwich structure SMD LED, MEMS...

This paper presents a novel microfluidic chip for in-vitro detection of biomolecules tagged by magnetic microparticles (MAPs) suspended in static fluid. The system consists two channels: reference channel which bare MAPs are and magnetically (LMAPs). LMAPs functionalized (of the same volume as ones channel) with attached biomolecules. overall, non-magnetic is greater than that MAPs. Current carrying microconductors positioned underneath channels order to impose field gradient move them from...