Laser-based magnetic micro-inscription : surface heating versus deep penetration regime

Pogačar, Marko (author), Jezeršek, Matija (author)

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.

• Language: English
• 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: Published
• Publication version: Author Accepted Manuscript
• Year: 2019
• Number of pages: Str. 164-170
• Numbering: Vol. 114
• PID: 20.500.12556/RUL-106190
• UDC: 535.13(045)
• ISSN on article: 0030-3992
• DOI: 10.1016/j.optlastec.2019.01.051
• COBISS.SI-ID: 16468251
• Publication date in RUL: 07.02.2019

Record is a part of a journal

• Title: Optics and laser technology
• Shortened title: Opt. laser technol.
• Publisher: Elsevier
• ISSN: 0030-3992
• COBISS.SI-ID: 26072576

Secondary language

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

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: L2-8183, P2-0392
• Name: Visoko prilagodljivi vlakenski laserji velikih moči za uporabo v industriji, Optodinamika