In this paper, an experimental study was carried out for the design of microsensorarrays dedicated to eddy current non destructive applications. A 3-microcoil 1-D array sensor was realized thanks to microtechnology. ...
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ISBN:
(纸本)9781424408412
In this paper, an experimental study was carried out for the design of microsensorarrays dedicated to eddy current non destructive applications. A 3-microcoil 1-D array sensor was realized thanks to microtechnology. Since each coil can be used as a transmitter or a receiver, five different transmission-reception strategies were considered for the inspection of a nickel based alloy target, featuring several calibrated surface notches. While the most basic strategy did not detect the smallest notch (0.1x0.1x0.1 mm(3)), the best strategy detected it with a 20 dB signal to noise ratio. The detection performances were then analyzed versus frequency and versus notch size.
For about 15 years, the solid-state Electronics Lab at the TU Dresden in co-operation with the DIAS Infrared GmbH has been developing pyroelectric linear arrays on the basis of lithium tantalate. These arrays have up ...
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ISBN:
(纸本)9780819468260
For about 15 years, the solid-state Electronics Lab at the TU Dresden in co-operation with the DIAS Infrared GmbH has been developing pyroelectric linear arrays on the basis of lithium tantalate. These arrays have up to 256 responsive elements and are responsive in the wavelength range of 0.8 ... 25 mu m. The geometry of the elements can be easily adjusted to the actual application. The available array technology allows the cost-effective production of linear arrays with a high signal-to-noise ratio and an excellent long-term stability. The paper describes the essential properties of the manufactured and newly developed linear arrays and also their applications in contactless temperature measurement, spectrometry and security systems.
A solid-state potentiometric CO2 sensor of the type CO2, O-2, Au, Li2CO3-BaCO3 vertical bar Nasicon vertical bar Na2Ti6O13-TiO2, Au, O-2, CO2 was fully manufactured in planar thick-film technology. On the rear side of...
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A solid-state potentiometric CO2 sensor of the type CO2, O-2, Au, Li2CO3-BaCO3 vertical bar Nasicon vertical bar Na2Ti6O13-TiO2, Au, O-2, CO2 was fully manufactured in planar thick-film technology. On the rear side of the sensor substrate an integrated heater is applied. Thus, it is possible to operate the sensor as a stand-alone device. On the one hand, based on the special meander structure of the heater, a homogeneous temperature distribution on the sensor side can be obtained. And on the other hand, it is possible to operate the sensor with the ideal working temperature of 525 degrees C. At this temperature, the sensor signal follows the theoretical considerations and responds to the Nernst equation. That way, it is possible to use the sensor in different applications, for example to detect the CO2 concentration of human breathing air or to monitor the air quality in closed rooms. (C) 2014 The Authors. Published
This presentation will discuss the latest developments in solidstate image sensor technology. Topics include 3D stacked image sensors, photon counting arrays, image sensors with phase detection pixels and time of fli...
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We propose a force/pressure sensing method utilizing a stretched capillary bridge of ionic liquid (IL). In the proposed method, an ionic liquid droplet is stretched by two electrodes, one of which is deformable. The f...
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ISBN:
(纸本)9780738125626
We propose a force/pressure sensing method utilizing a stretched capillary bridge of ionic liquid (IL). In the proposed method, an ionic liquid droplet is stretched by two electrodes, one of which is deformable. The force or pressure applied to this electrode causes the capillary bridge to deform and change its impedance. Thus, the applied force/pressure can be measured by measuring the impedance of the capillary bridge. In comparison with the conventional method based on measurement of interfacial capacitance of the IL droplet, the proposed method offers several advantages such as high sample rate and the capability to miniaturizing the sensor without decreasing the sensitivity. To shed a light on the optimization of the sensor design, we investigated the dependence of the impedance of the capillary bridge on the stretched length and the dependence of the impedance change due to the stretching on the volume of the droplet. Finally, we demonstrated the applications of this method as a force sensing cantilever and a pressure sensor that can measure pulse wave.
This paper describe the development of a quasianalog accelerometer which uses an array of acceleration switches. The investigations are based on results or fabricated and evaluated single-microswitch sensors. The new ...
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This paper describe the development of a quasianalog accelerometer which uses an array of acceleration switches. The investigations are based on results or fabricated and evaluated single-microswitch sensors. The new acceleration sensor concept combines the advantage of high EMI immunity and simple signal pre-conditioning circuitry. Important characteristics of the laterally moving cantilevers, such as resonance frequency and switching time, can he determined by a single mask. First test devices have been fabricated by the use of a special sacrificial-layer additive technology. This Microform technology combines UV patterning of very thick photoresist layers and moulding of the resulting patterns by electroplated metals. This technology is used for the fabrication of laterally driven microswitches, each having a different acceleration threshold. tinder an applied acceleration, the cantilever beam deflects laterally and closes a contact with an electrode. With an electrode on each side of the cantilever, two directions of acceleration can be measured. A simulation model has been developed which enables the design of quasianalog sensors for different applications. Different layouts are created to investigate the basic characteristics. The simulation results are verified on a shaker using the fabricated lest structures of a single-microswitch sensor.
sensorapplications, Inc. has developed a variety of novel approaches in the use of low-cost, passive magnetic sensors, referenced to the earth's magnetic field, to provide a true measurement of roll, pitch, and y...
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ISBN:
(纸本)0819414727
sensorapplications, Inc. has developed a variety of novel approaches in the use of low-cost, passive magnetic sensors, referenced to the earth's magnetic field, to provide a true measurement of roll, pitch, and yaw, and, as a derivative, angular acceleration and velocity. These sourceless, non-inertial sensors have a strong potential to replace existing inertial, gravity or mass-based technologies in a multitude of applications. The novel geometric arrangement of solidstate magnetic sensors and the associated algorithms involved in resolving the earth's magnetic field vectors, provides a non-inertial 3-axis sensor capable of monitoring in realtime roll, pitch, and yaw. This paper also describes the current development of a solidstate, adaptive, self-calibrating sensor, also referenced to the earth's magnetic field, that is immune to local field strength variations. Promising results outlined in this paper from pilot projects in virtual reality headtracking, biomechanical gait analysis, suggests that this new technology has the potential to meet the angular tracking requirements of both large volume consumer applications, and small cost-conscious research efforts.
This paper gives an overview of the most important results obtained in the development of pyroelectric single-element detectors and arrays (up to 256 responsive elements) at the Institute for solid-state Electronics a...
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ISBN:
(纸本)0819451355
This paper gives an overview of the most important results obtained in the development of pyroelectric single-element detectors and arrays (up to 256 responsive elements) at the Institute for solid-state Electronics at the Dresden University of Technology. Since the late 1970s, the Institute has been carrying out a wide range of research and development work in this area. This work aimed at the development of sensor technologies which allow the construction and cost-efficient manufacturing of long-term stable detectors with a high signal-to-noise ratio. It is shown that a flexible sensor technology has been developed on the basis of lithium tantalate (LiTaO3) which allows to adjust the detector layout and its properties to the planned application in the best possible way. This applies to the number and geometry of the responsive elements and also to the spectral responsitivity, the noise and the spatial resolution of the detectors.
solid-state nanopores are a promising class of electronic sensor for biosensing applications and single-molecule studies. We report the development of solid-state nanopores for the detection and study of single rod-li...
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ISBN:
(纸本)9781467322980
solid-state nanopores are a promising class of electronic sensor for biosensing applications and single-molecule studies. We report the development of solid-state nanopores for the detection and study of single rod-like viruses, and a nanopore combined with a micron-scale chamber for trapping and analyzing a single DNA molecule.
Electron field emission from an array of patterned pyramids of polycrystalline diamond for microsensorapplications has been investigated. Selective deposition and molding of polycrystalline diamond film in a silicon ...
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Electron field emission from an array of patterned pyramids of polycrystalline diamond for microsensorapplications has been investigated. Selective deposition and molding of polycrystalline diamond film in a silicon cavity mold and subsequent creation of free standing polycrystalline diamond diaphragm with diamond pyramidal-microtips has been achieved. High current emission from the patterned diamond microtip arrays was obtained at low electric fields. Field emission for these diamond microtips exhibits significant enhancement both in total emission current and stability compared to pure silicon emitters. The findings suggest the potential use of diamond-based field emitter arrays in microsensors such as pressure sensors, accelerometers, and tactile sensors.
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