Radar Applications in Level Measurement, Distance Measurement and Nondestructive Material Testing

Otto, J.

doi:10.1109/euma.1997.337946

Cited by 16 publications

(6 citation statements)

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“…In addition to simultaneous sensing of multiple fluids, our proposed multi-sensor makes use of radio frequency, in the range of 130MHz to 180MHz, which is much higher in frequency as compared to the excitation frequency used for capacitive sensors, while it is much lower in frequency than what is used for radar based level sensors making its readout circuitry much cheaper and easier to realize. In radar based wave reflective sensors, resolution is directly linked with the frequency used because of which 24GHz frequency band is typically used to achieve 1% resolution [8]. In comparison, the presented resonator based microwave sensor has been demonstrated to achieve level measurement accuracy of 0.6% and the resolution at least 5 times higher i.e.…”

Section: Introductionmentioning

confidence: 98%

“…Wide range of sensors based upon the principles of optics [1], ultrasounds [2] [3], capacitance [4] [5] and radars [6] [7] are currently available to do the job. However, optical sensors suffer with low signal-to-noise (SNR) ratio in the presence of dust or fog while ultrasound based level sensors are known to get affected by the surface foams [8]. It has been shown by Demori in [9] that low excitation frequency (below 2 MHz), which is typically used to extract capacitance to sense liquids based upon their dielectric constant, results into low sensitivity especially in the presence of lossy mediums like saline water.…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, microwave resonator based sensors are used for characterizing small amounts of fluids in microfluidic channels [10] [11]. For high-volume liquid sensing, ultra-high frequency guided wave radar based level sensors are currently used which are not only expensive [12] but are intrusive as well [7] while contactless radar based level sensors are affected by surface turbulence during liquid agitation and extensive signal processing is required to mitigate the effects which increases the cost of the system [8].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Channel, Microwave-Based, Compact Printed Sensor for Simultaneous and Independent Level Measurement of Eight Liquids

2019

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Industrial automation relies on sensing the process parameters like liquid levels. Simultaneous sensing of multiple fluids is especially useful for many automation processes involving multiple ingredients. Some of the desirable features in any level sensor are its non-intrusiveness, high accuracy and consistent performance. These features can be achieved with typical microwave radar based level sensors. However, this paper presents a microwave resonance method instead of typical microwave reflectance (radar) to reliably sense the liquid level at fraction of the cost using a unique printed sensor. In addition to that, sensor design presented in this article enables sensing liquid level of 8 liquids simultaneously and independently utilizing its multiple channels. An array of eight modified microwave Tresonators has been compactly packed inside a metallic cylinder of just 4˝ diameter where the resonators share the same ground plane. Sensors' performance, to measure the unknown level of eight different fluids (with dielectric constant (∈r) ranging from 2.8 to 80), has been measured in real time using a custom-built software. Simple one point calibration procedure has also been proposed in this paper which has resulted into measurement accuracy of ~0.6% which is better than 1%, realizable with highend and expensive radar based level sensors.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-Channel, Microwave-Based, Compact Printed Sensor for Simultaneous and Independent Level Measurement of Eight Liquids

2019

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“…Hence, for example, iGPS, which is usually considered a very accurate and versatile system, cannot be used for the measurement of liquid surfaces in tanks. 117,118 On the contrary, US systems may be used for measuring the change of density or temperature in air or for flow analysis. 119 Hence, they can be very helpful for mapping environment gradients in a given volume or space.…”

Section: 113-116mentioning

confidence: 99%

Large-scale dimensional metrology (LSDM): from tapes and theodolites to multi-sensor systems

Franceschini

Galetto

Maisano

et al. 2014

Int. J. Precis. Eng. Manuf.

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Last decades witness an increasing interest in Large-Scale/Large-Volume Dimensional Metrology (LSDM). Many fields of application, ranging from construction to shipbuilding and aerospace, have shown more and more accurate and versatile systems for geometric control and tolerancing. Especially in the last ten years, optical technology has registered a fundamental step forward both in terms of metrological performances, versatility and convenience of use. This is further demonstrated by the current large diffusion of laser tracker and photogrammetric systems. The growth is also complemented by the development of new standards, even though a comprehensive body specific for LSDM is still lacking. The twofold aim of the present survey is to present a bibliographical and bibliometric analysis of the field and to propose a scheme of classification of the main current approaches. As an output of this paper, a "LSDM Multi-perspective Model" is introduced, according to which dominant technologies and restrictions are analyzed with the aim of individuating current lacks and defining the roadmap for future development of new instruments and systems.

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“…Die Mehrzahl der am Markt befindlichen Radar-Fçllstandmessgeråte besitzen eine Betriebsfrequenz bei 6 GHz oder 10 GHz [2]. Neuerdings ist ein klarer Trend zur 24-GHz-Technologie zu verzeichnen [3].…”

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Neuartiges Radar-Füllstand-Messgerät auf Basis von 24-GHz-Technologie (Novel Radar Level Gauge Using 24-GHz-Technology)

Oréans¹,

Heide²

2000

Teme

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Die Radartechnik bietet im Vergleich zu traditionellen Messprinzipien (Schwimmer, Peilstab, kapazitive und konduktive Sonden, Differenzdruckmessung etc.) entscheidende Vorteile [1], die der Technologie im Bereich Fçllstandmessung hohe Zuwachsraten bescheren. Einige wichtige Vorzçge sind das berçhrungslose Messen, die Materialunabhångigkeit der Messung und die Insensitivitåt gegençber verånderlichen Prozessbedingungen (Temperatur, Druck, Staub, aggressive Medien etc.).

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Radar Applications in Level Measurement, Distance Measurement and Nondestructive Material Testing

Cited by 16 publications

References 0 publications

Multi-Channel, Microwave-Based, Compact Printed Sensor for Simultaneous and Independent Level Measurement of Eight Liquids

Multi-Channel, Microwave-Based, Compact Printed Sensor for Simultaneous and Independent Level Measurement of Eight Liquids

Large-scale dimensional metrology (LSDM): from tapes and theodolites to multi-sensor systems

Neuartiges Radar-Füllstand-Messgerät auf Basis von 24-GHz-Technologie (Novel Radar Level Gauge Using 24-GHz-Technology)

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