Laser-based magnetic micro-inscription : surface heating versus deep penetration regime
ID Pogačar, Marko (Author), ID Jezeršek, Matija (Author)

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The technology of magnetic micro-inscription can be used for in-axis positioning measurements directly from a linear actuator which reduces the cost and size of the whole system. In this paper, two different regimes for laser-based magnetic micro-inscription were compared: a surface heating and a deep penetration heating. The first regime is the same as conductive heating and the second is similar to the process of keyhole welding. The experimental results show that both processes can be effectively stabilized by means of controlling the width and depth of the microstructure transformation cross-section, as they are able to compensate for external disturbances, such as higher roughness, and the gradual accumulation of heat. From numerical analysis it could be seen that the perfect inscription should have depth equal or more than 0.8 of period of inscription and width around 0.80+/-0.05 of period which is not achievable with the surface heating regime, but only with the deep penetration regime. Results show that the deep penetration heating requires 5-times less laser energy which leads to lower heat accumulation and a more stable process, is unaffected by disturbances, such as higher roughness, and provides an almost 15% higher relative amplitude as measured by the reference magnetic sensor.

Keywords:magnetic inscriptions, surface heating, deep penetration heating, adaptive laser, power control, microstructure transformation, magnetic encoder
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status in journal:Published
Article version:Postprint, final article version, accepted into publication
Number of pages:Str. 164-170
Numbering:Vol. 114
PID:20.500.12556/RUL-106190 This link opens in a new window
ISSN on article:0030-3992
DOI:10.1016/j.optlastec.2019.01.051 This link opens in a new window
COBISS.SI-ID:16468251 This link opens in a new window
Publication date in RUL:07.02.2019
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Record is a part of a journal

Title:Optics and laser technology
Shortened title:Opt. Laser Technol.
COBISS.SI-ID:26072576 This link opens in a new window

Secondary language

Keywords:magnetne oznake, površinsko gretje, adaptivno krmiljenje laserske moči, mikrostrukturna transformacija, magnetni enkoderji, parnično gretje


Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:L2-8183, P2-0392
Name:Visoko prilagodljivi vlakenski laserji velikih moči za uporabo v industriji, Optodinamika

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