Near-field interrogation of SAW resonators on rotating machinery

Boccard, J.-M.; Katus, P.; Renevier, R.; Reindl, Leonhard M.; Friedt, Jean Michel

doi:10.5194/jsss-2-147-2013

Cited by 9 publications

(8 citation statements)

References 24 publications

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“…This strategy showed better stability of the transmission loss for different angular positions. In our case, both stator and rotor lines were matched to the SAW devices and the transmission loss obtained with the stator matched to 50 Ω and the rotor in short circuit ( Figure 6 a) is similar to the transmission loss Boccard et al obtained ( Figure 10 , [ 20 ]).…”

Section: Resultssupporting

confidence: 85%

“…A similar coupler was implemented by Boccard and his co-workers [ 20 ]; however, they used a coplanar strip line coupler, the coupling elements were de-tuned and resonated at a higher frequency than the SAW device and the design approach aimed at minimizing the frequency pulling and providing 360° angular coverage of the sensor visibility by the reader. This strategy showed better stability of the transmission loss for different angular positions.…”

Section: Resultsmentioning

confidence: 99%

“…In some cases, however, this procedure may make the shaft itself more fragile and would need to be avoided. One way to overcome this issue would be to clamp the temperature sensor to the shaft, like in [ 20 ]. In this case, the sensor would not be measuring the temperature of the shaft directly and the pre-calibration of the set sensor + clamping ring + shaft would be required.…”

Section: Discussionmentioning

confidence: 99%

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Measuring Torque and Temperature in a Rotating Shaft Using Commercial SAW Sensors

Silva

Mendes

Péreira

et al. 2017

Sensors

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Real-time monitoring of torque in a rotating shaft is not easy to implement with technologies such as optic fiber sensors or strain gages. Surface acoustic wave (SAW) sensors are wireless and passive and can be used to monitor strain in moving parts. Commercial solutions (sensors, antennas and interrogation unit) can easily be purchased from some companies; however, they are not customized and may not meet the specificity of the measurements. In order to evaluate the adequacy of commercial off-the-shelf (COTS) solutions, temperature and strain sensors fabricated by SENSeOR (Besançon, France) were mounted on a load cell. The sensors were calibrated using a thermal chamber and a universal testing machine. The load cell was then assembled together with a steel shaft that rotated at different speeds inside an oven. The commercial antennas were replaced with an RF (radio frequency) coupler and the sensors were interrogated with the commercial interrogation unit. The influence of rotation in the accuracy on the measurements, as well as the adequacy of the sensors structure, was evaluated. It can be concluded that SAW sensors can be used to measure temperature or torque in a rotating environment; however, some customization of the components is required in order to overcome the limitations posed by COTS sensing solutions.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Measuring Torque and Temperature in a Rotating Shaft Using Commercial SAW Sensors

Silva

Mendes

Péreira

et al. 2017

Sensors

View full text Add to dashboard Cite

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“…Usually, RF rotation couplers are used in these scenarios for wireless interrogation, which have the advantage of a good signal transmission and higher robustness against external interference compared to a free space transmission. There are several possibilities for the realization of such couplers, e.g., based on electrically shorted transmission lines or open coplanar strip lines [ 134 , 135 ]. In general, care must be taken to minimize the parasitic frequency shift (known as “pulling effect”) caused by angle-dependent impedance variations of the coupling elements [ 135 ].…”

Section: Overall Comparison and Discussionmentioning

confidence: 99%

Reader Architectures for Wireless Surface Acoustic Wave Sensors

Lurz

Ostertag²,

Scheiner

et al. 2018

Sensors

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Wireless surface acoustic wave (SAW) sensors have some unique features that make them promising for industrial metrology. Their decisive advantage lies in their purely passive operation and the wireless readout capability allowing the installation also at particularly inaccessible locations. Furthermore, they are small, low-cost and rugged components on highly stable substrate materials and thus particularly suited for harsh environments. Nevertheless, a sensor itself does not carry out any measurement but always requires a suitable excitation and interrogation circuit: a reader. A variety of different architectures have been presented and investigated up to now. This review paper gives a comprehensive survey of the present state of reader architectures such as time domain sampling (TDS), frequency domain sampling (FDS) and hybrid concepts for both SAW resonators and reflective SAW delay line sensors. Furthermore, critical performance parameters such as measurement accuracy, dynamic range, update rate, and hardware costs of the state of the art in science and industry are presented, compared and discussed.

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“…Pulling effect refers to unwanted frequency change due to the metallic environment-induced parasitic impedances of the probed circuit. It will always yield frequency decrease with respect to the resonator resonance frequency 24 and induces the measurement errors, which is the core difference compared with traditional wireless sensors.…”

Section: Research Consideration and Methodsmentioning

confidence: 99%

Transmission and measurement characteristics evaluation of surface acoustic wave sensor on rotating spindle in machine tools

Yao

Luan

2016

Advances in Mechanical Engineering

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Surface acoustic wave sensors offer overwhelming advantages over other potentially competitive sensing technologies in rotating mechanical structures for their wireless and passive capability. Nevertheless, the challenges of using these sensors have not been adequately addressed. Radio frequency signal of surface acoustic wave sensors acts as not only the role of data transmission but also the role of energy supply during the sensing system working process. Thus, the performance of surface acoustic wave sensors when they are used to monitor rotating spindles should be investigated due to the harsh metallic environments for radio propagation in machine tool. This article aims to experimentally study the performance of surface acoustic wave sensors on both rotating spindle with Computer Numerical Control machine tool and self-developed spindle apparatus. The measurement study is performed using a temperature surface acoustic wave sensor working in the Industrial Scientific and Medical (ISM) band (433.05-434.79 MHz). Experimental results have shown that transmission and measurement characteristics were closely depended on the surface acoustic wave sensor installation location and rotation speeds. The conclusions will directly guide the sensor location optimization, power setting, errors avoidance, or correction in the future work.

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Near-field interrogation of SAW resonators on rotating machinery

Cited by 9 publications

References 24 publications

Measuring Torque and Temperature in a Rotating Shaft Using Commercial SAW Sensors

Measuring Torque and Temperature in a Rotating Shaft Using Commercial SAW Sensors

Reader Architectures for Wireless Surface Acoustic Wave Sensors

Transmission and measurement characteristics evaluation of surface acoustic wave sensor on rotating spindle in machine tools

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