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2020 | OriginalPaper | Buchkapitel

4. Microwave Rotary Encoders

verfasst von : Ferran Martín, Cristian Herrojo, Javier Mata-Contreras, Ferran Paredes

Erschienen in: Time-Domain Signature Barcodes for Chipless-RFID and Sensing Applications

Verlag: Springer International Publishing

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Abstract

It was shown in Chap. 3 that the relative position and instantaneous velocity between the tag and the reader in a chipless-RFID system based on time-domain signature barcodes can be easily inferred by measuring the time distance between dips, or pulses, in the envelope function. If the system is intended to be applied to motion control (i.e., as linear displacement and velocity sensor), the ID code of the tag must be well known, so that from the space between functional resonant elements or strips in the tag, the tag position and velocity can be determined. As it was discussed in Sect. 3.​6.​3, it is convenient to implement the tag with all-functional inclusions (code ‘111…’), since the spatial resolution (intimately related to the number of pulses in the envelope function) is optimized by considering such ID code. Thus, the angular displacement and velocity of the circular resonator chain (printed or etched in the rotor), relative to the sensitive part of the reader (which acts as stator), can be recorded.

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Fußnoten
1
In the proposed rotary encoders of this chapter, the tag inclusions are resonant elements.
 
2
To automatically determine the pulses, or dips, in the envelope function, it is convenient to maximize the variation experienced by such function.
 
3
This expression is valid for constant angular velocity. If the rotation speed varies with time, the integral form is needed.
 
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Metadaten
Titel
Microwave Rotary Encoders
verfasst von
Ferran Martín
Cristian Herrojo
Javier Mata-Contreras
Ferran Paredes
Copyright-Jahr
2020
DOI
https://doi.org/10.1007/978-3-030-39726-5_4

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