SAW-based redio sensor systems for short-range applications

Scholl, Gerd; Korden, C.; Riha, E.; Ruppel, C.C.W.; Wolff, U.; Riha, G.; Reindl, L.; Weigel, Robert

doi:10.1109/mmw.2003.1266068

Cited by 49 publications

(12 citation statements)

References 13 publications

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“…The same microcontroller can measure temperature by an additional sensor. A more advanced solution can apply the newly developed SAW-based radio temperature sensor [15]. This means that the temperature sensor can be attached directly to the varistor case without wires but at the cost of an additional transceiver unit connected to the microcontroller.…”

Section: Measurement System For Varistor Quality Monitoringmentioning

confidence: 99%

Problems of Varistor Quality Assessment During Exploitation

Smulko¹,

Olesz²,

Hasse³

et al. 2012

Metrology and Measurement Systems

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Varistors are commonly used elements which protect power supply networks against high-voltage surges or lightning. Therefore, quality and endurance of these elements is important to avoid losses when an expensive laboratory equipment would not be protected from random overvoltages. Additionally, excessive leakage currents generate serious costs due to high energy consumption. The paper presents shortly properties of varistors that comprized different ZnO grain types and can have various quality which changes continuously during exploitation (due to exposition to overheating and overvoltage pulses). Therefore, it is important to monitor varistors during their ageing (causing changes within their microstructures). A few methods of varistor property diagnosis were considered and compared with the methods currently applied in laboratory or industry applications. A new measurement (diagnostic) system that can monitor varistors during ageing and can be widely applied in power networks is presented. The proposed system fulfills requirements of the industrial customers which demand various methods for power line protection. The proposed system can be simply developed into a more advanced wireless diagnostic system of long power supply lines.

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Section: Measurement System For Varistor Quality Monitoringmentioning

confidence: 99%

Problems of Varistor Quality Assessment During Exploitation

Smulko¹,

Olesz²,

Hasse³

et al. 2012

Metrology and Measurement Systems

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“…10 In our tests, we use two tags with extended antennas and a center passband separation of 350 kHz to differentiate the two sensors with frequency discrimination. For larger networks, it is possible to use delay lines to give each tag a unique identifier in the time domain.…”

Section: B Dual Tagsmentioning

confidence: 99%

Fabrication methods for creating flexible polymer substrate sensor tags

Skinner

2009

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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Articles you may be interested inA wireless demodulation system for passive surface acoustic wave torque sensor Rev. Sci. Instrum. 85, 125001 (2014); 10.1063/1.4902180 Local oscillator phase noise limitation on the resolution of acoustic delay line wireless passive sensor measurement Rev. Sci. Instrum. 85, 065001 (2014); 10.1063/1.4880455 Surface acoustic wave devices as passive buried sensorsThe authors describe the design, fabrication, and testing of a passive wireless sensor platform utilizing low-cost commercial surface acoustic wave ͑SAW͒ filters and sensors. Polyimide and polyethylene terephthalate sheets are used as substrates to create a flexible sensor tag that can be applied to curved surfaces. A microfabricated antenna is integrated on the substrate in order to create a compact form factor. The sensor tags are fabricated using 315 MHz SAW filters and photodiodes and tested with the aid of a fiber-coupled tungsten lamp. Microwave energy transmitted from a network analyzer is used to interrogate the sensor tag. Due to an electrical impedance mismatch at the SAW filter and sensor, energy is reflected at the sensor load and reradiated from the integrated antenna. By selecting sensors that change electrical impedance based on environmental conditions, the sensor state can be inferred through measurement of the reflected energy profile. Testing has shown that a calibrated system utilizing this type of sensor tag can detect distinct light levels wireless and passively. The authors also demonstrate simultaneous operation of two tags with different center passbands that detects light. Ranging tests show that the sensor tags can operate at a distance of at least 3.6 m.

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“…The acoustic wave velocity is typically a function of the quantity intended to be measured. Applications and limitations of the technology have been heavily studied [9] with the limiting factors being low packaging reliability, higher cost, and lithographic upper limits on the resonance frequency and quality factor.…”

Section: Introductionmentioning

confidence: 99%

A parallel plate dielectric resonator as a wireless passive strain sensor

Aftab

Yousaf

Hoppe

et al. 2015

2015 IEEE Sensors Applications Symposium (SAS)

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This paper presents a wireless passive strain sensing concept that functions by detuning a dielectric resonator. It is shown how a high Q resonator functions as a wireless passive sensor when correctly matched with an antenna. Finite element and analytical models are compared with experimental data and the sensor cross sensitivity with respect to temperature and humidity are also explored. The sensitivity of the resonance frequency to the strain, temperature and humidity is measured to be 51.6 ppm/µm, 10.09 ppm/K and -0.65 ppm/% respectively.

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SAW-based redio sensor systems for short-range applications

Cited by 49 publications

References 13 publications

Problems of Varistor Quality Assessment During Exploitation

Problems of Varistor Quality Assessment During Exploitation

Fabrication methods for creating flexible polymer substrate sensor tags

A parallel plate dielectric resonator as a wireless passive strain sensor

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