A New and Accurate System for Measuring Cruising Yacht Freeboards With Magnetostrictive Sensors

Baronti, Federico; Fantechi, G.; Roncella, Roberto; Saletti, Roberto

doi:10.1109/tim.2011.2113050

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…In our experiments, the current in the transmitting coil of the magnetostrictive sensor was used to produce a time-varying magnetic field around the conductor [8], [9]. The electromagnetic relationship of them can be simply expressed by…”

Section: Magnetostrictive Guided Wave and Signal Processing A Mamentioning

confidence: 99%

A Magnetostrictive Guided-Wave Nondestructive Testing Method With Multifrequency Excitation Pulse Signal

Zhang

Zhou

Sun³

et al. 2014

IEEE Trans. Instrum. Meas.

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As a rapid, noncontact, and nondestructive technology, magnetostrictive guided waves have been widely used for the quality inspection of pipes and stay cables. Traditionally, a singlefrequency signal with a high amplitude and a long pulse duration is used to increase the excitation energy and detection distance. However, the longer the pulse duration of a single-frequency signal is, the lower the resolution of adjacent defects and the accuracy of defect location will be. A novel method of addressing this problem is proposed in this paper. An encoded multifrequency excitation signal, whose frequency range is selected from a calculated dispersion curve, is used to excite the guided wave. After passing through the signal-conditioning board, the detected defect signals are sampled, averaged, and then filtered using a matched filter. In this manner, the pulse width of echoes can be greatly compressed. Our experimental results demonstrate that our proposed method can improve the resolution of adjacent defects and the accuracy of defect location in the propagation direction of the magnetostrictive guided wave.

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Section: Magnetostrictive Guided Wave and Signal Processing A Mamentioning

confidence: 99%

A Magnetostrictive Guided-Wave Nondestructive Testing Method With Multifrequency Excitation Pulse Signal

Zhang

Zhou

Sun³

et al. 2014

IEEE Trans. Instrum. Meas.

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“…This value is obviously a theoretical bound given by the digital nature of the displacement measurement and is not achievable because of the many factors for which the accuracy obtainable is worse than resolution. If we consider the absolute accuracy of the displacement reading to be of the order of 1 mm [ 17 ] and the same value as the accuracy of a differential measurement, then from Equation (5) the accuracy achievable with the density sensor is 1.49 × 10 −4 ( i.e. , about 150 ppm).…”

Section: Density Meter Designmentioning

confidence: 99%

“…The aim of this paper is to extend the findings mentioned above and to present the design of a seawater electronic density meter based on the buoyancy force measurement carried out using a magnetostrictive linear displacement sensor. A preliminary description of this meter, used in a WSN for measuring the freeboard of cruising yachts, can be found in [ 17 ]. We extend here the brief description in [ 17 ] by recalling the theory of operation, presenting in detail the design of the prototype and showing some new experimental results that demonstrate its functionality and characterize its performance.…”

Section: Introductionmentioning

confidence: 99%

“…A preliminary description of this meter, used in a WSN for measuring the freeboard of cruising yachts, can be found in [ 17 ]. We extend here the brief description in [ 17 ] by recalling the theory of operation, presenting in detail the design of the prototype and showing some new experimental results that demonstrate its functionality and characterize its performance. The laboratory experiments were carried out by equipping the sensor with a radiofrequency (RF) standard wireless interface (namely Bluetooth).…”

Section: Introductionmentioning

confidence: 99%

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Wireless Sensor Node for Surface Seawater Density Measurements

Baronti

Fantechi

Roncella

et al. 2012

Sensors

Self Cite

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An electronic meter to measure surface seawater density is presented. It is based on the measurement of the difference in displacements of a surface level probe and a weighted float, which according to Archimedes’ law depends on the density of the water. The displacements are simultaneously measured using a high-accuracy magnetostrictive sensor, to which a custom electronic board provides a wireless connection and power supply so that it can become part of a wireless sensor network. The electronics are designed so that different kinds of wireless networks can be used, by simply changing the wireless module and the relevant firmware of the microcontroller. Lastly, laboratory and at-sea tests are presented and discussed in order to highlight the functionality and the performance of a prototype of the wireless density meter node in a Bluetooth radio network. The experimental results show a good agreement of the values of the calculated density compared to reference hydrometer readings.

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“…Therefore, many studies have been conducted in attempts to clarify these issues. Most of the research literatures on MPS focus on improving the efficiency of magnetomechanical coupling [6], [7], increasing the precision of measurement position [8], [9], dealing with nonlinear signals [10], optimizing the strain transportation, receiving process [11], [12] and the structural parameters of the sensor [13], improving the blind area and the noise suppression [14], [15], expanding the engineering application scope [16]- [18], and so on.…”

Section: Introductionmentioning

confidence: 99%

Enhancing MPS Signal by Bipolar Pulse Excitation and Interference of Reflection Wave

Deng

Kang

et al. 2014

IEEE Trans. Instrum. Meas.

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To enhance the signal intensity of magnetostrictive position sensor (MPS), a new method of bipolar pulse excitation (BPE), and a new structure of single-end damper (SED) are proposed in this paper. Two torsion strain waves, named as W1 and W2 waves, are generated by the BPE, and the W1 wave is reflected (changed into RW1) by the SED. Based on the principle of wave superposition, the interference between RW1 and W2 is realized by adjusting the structure parameters of the sensor. Therefore, the MPS signal is strengthened 1.8 times approximately as well as the measuring range. The notable difference between the new strategy and the conventional one lies in the reflection wave. In conventional MPS, the smaller the reflection wave is, the better the signal will be. However, the reflection wave should be as strong as possible in the new strategy. After the explanation of BPE and SED, a new model is presented. The validity and feasibility of the proposed strategy are verified by experiments. Finally, the characteristics of BPE and SED, such as the measured object, the polar of excitation pulse, and the limit of signal, are discussed in detail. Research results indicate that the proposed BPE method and SED structure are innovative development to conventional MPS, and are of great practical value.Index Terms-Magnetostrictive position sensor (MPS), measuring range expansion, signal enhancement, torsion strain wave, wave interference.

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A New and Accurate System for Measuring Cruising Yacht Freeboards With Magnetostrictive Sensors

Cited by 7 publications

References 16 publications

A Magnetostrictive Guided-Wave Nondestructive Testing Method With Multifrequency Excitation Pulse Signal

A Magnetostrictive Guided-Wave Nondestructive Testing Method With Multifrequency Excitation Pulse Signal

Wireless Sensor Node for Surface Seawater Density Measurements

Enhancing MPS Signal by Bipolar Pulse Excitation and Interference of Reflection Wave

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