BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Magnetic field sensors for high precision surface scanners DTSTART:20220118T130000Z DTEND:20220118T150000Z DTSTAMP:20260802T192914Z UID:faa4ab9f-31bb-4b7e-a233-b15a95be5be3 SEQUENCE:3 CREATED:20220111T143339Z DESCRIPTION:Abstract: The new technical paradigm of Industry 4.0 has been pushing the sensor technology\, instrumentation\, and measurement science to continue the progression of achieving the control and efficiency over t he entire mass production process. Therefore\, the development of smart an d autonomous systems has led to a high demand of sensors for the monitoriz ation of angular and linear positioning among the industrial\, automotive and robotics market.The main limitations of the existing magnetic sensing technology based on state-of-art anisotropic magnetoresistive and hall eff ect sensors for incremental and absolute positioning systems rely on a low reading distance and a minimum pole pitch size down to 500 µm\, which le ads to a lower resolution and accuracy when compared to optical based enco ders. The recent developments on magnetoresistive sensor technologies prov ide a competitive and reliable solution for the next generation of motion systems based on magnetic encoders\, where the high signal-to-noise ratio and the enhanced spatial resolution of tunnel magnetoresistive sensors (TM R) can promote the detection of sub-100 µm pole pitch dimensions\, drivin g to a performance similar to low-level optical encoders in terms of accur acy but with a lower production cost\, enhanced working distance\, reduced mounting tolerances and higher robustness to harsh environments. Therefor e\, following the technological trend observed in the hard disk devices\, the development of the new generation of incremental magnetic encoders bas ed on the TMR sensing technology focused on the (i) enhancement of the dev ice reading distance beyond a gap equivalent to 1x pole pitch dimension an d on the (ii) improvement of the accuracy employing (a) commercial elastom er bonded ferrite linear scales from a sub-100µm to a 5 mm pole pitch ran ge and (b) microfabricated thin film magnetic scales based on a pole-groov e pattern with a sub-500 µm pole pitch range.The optimization of the sens ing technology\, the sensor arrangement and packaging method delivered a s uccessful outcome for a future short-term breakthrough on the available en coder solutions by achieving an accuracy around 3 µm at a reading distanc e of 1x for a pole pitch of 80 µm. On the other hand\, a reading distance range around 3x was achieved for standard pole pitch dimensions\, being a ble to reduce the mounting requirements in non-accurate applications. LAST-MODIFIED:20220111T143805Z LOCATION:Online URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/magnetic-field-sensors-for -high-precision-surface-scanners/ X-ALT-DESC;FMTTYPE=text/html:

Abstract:
The new technical paradigm of Industry 4.0 has been pushing the sensor technology\, instrumentation\, and measurement science to continue the pro gression of achieving the control and efficiency over the entire mass prod uction process. Therefore\, the development of smart and autonomous system s has led to a high demand of sensors for the monitorization of angular an d linear positioning among the industrial\, automotive and robotics market .

The main limitations of the existing m agnetic sensing technology based on state-of-art anisotropic magnetoresist ive and hall effect sensors for incremental and absolute positioning syste ms rely on a low reading distance and a minimum pole pitch size down to 50 0 µm\, which leads to a lower resolution and accuracy when compared to op tical based encoders.

The recent developments on magnetoresistiv e sensor technologies provide a competitive and reliable solution for the next generation of motion systems based on magnetic encoders\, where the h igh signal-to-noise ratio and the enhanced spatial resolution of tunnel ma gnetoresistive sensors (TMR) can promote the detection of sub-100 µm pole pitch dimensions\, driving to a performance similar to low-level optical encoders in terms of accuracy but with a lower production cost\, enhanced working distance\, reduced mounting tolerances and higher robustness to ha rsh environments.

Therefore\, following the technological trend observed in the hard disk devices\, the development of the new generation of incremental magnetic encoders based on the TMR sensing technology focus ed on the (i) enhancement of the device reading distance beyond a gap equi valent to 1x pole pitch dimension and on the (ii) improvement of the accur acy employing (a) commercial elastomer bonded ferrite linear scales from a sub-100µm to a 5 mm pole pitch range and (b) microfabricated thin film m agnetic scales based on a pole-groove pattern with a sub-500 µm pole pitc h range.


The optimization of the sensing technology\, the sensor arrangement and packaging method delivered a succ essful outcome for a future short-term breakthrough on the available encod er solutions by achieving an accuracy around 3 µm at a reading distance o f 1x for a pole pitch of 80 µm. On the other hand\, a reading distance ra nge around 3x was achieved for standard pole pitch dimensions\, being able to reduce the mounting requirements in non-accurate applications.

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