Method of Calibration of a Laser-Based Galvanometric Scanning System with Submicron Resolution

Bessmeltsev, V. P.; Goloshevsky, N. V.; Kasterov, V. V.; Kipriyanov, Ya. A.; Smirnov, K. K.

doi:10.3103/s8756699018040118

Cited by 3 publications

(2 citation statements)

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“…In most of the published works [7,[14][15][16][17], the calibration of laser galvanometric scanning systems by calculating correction tables was performed as follows: The laser beam was controlled to desired positions, which were defined by a grid of points. The laser beam engraved a grid of marks on a calibration plate to establish real positions of laser spot.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Subsequently, the real positions of laser spot were measured by a measurement system in another location. Finally, based on mathematical models (with assembly defects [7] or without defects [16,17]) and experimental data, the correction tables/matrices were calculated. These methods allow the laser galvanometric scanning heads to be calibrated effectively and precisely.…”

Section: Literature Reviewmentioning

confidence: 99%

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In situ calibration of galvanometric scanning head for laser powder bed fusion machines based on a vision system

Quinsat

2020

Int J Adv Manuf Technol

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In Laser Powder Bed Fusion (LPBF) additive manufacturing machines, a laser galvanometric scanning system is used to control the movement of the laser beam, which melts material powders layer-by-layer in a powder bed. Errors between desirable positions and actual positions of the laser in the work plane of the machine directly affect the geometry accuracy of built parts. Therefore, calibrating the laser galvanometric scanning system of LPBF machines is a very important task. This system is generally calibrated by calculating correction tables for its joint components. However, most existing calibration methods require a measuring phase of actual positions of laser engraved on a calibration plate. This phase was generally performed by a measuring system in another location, thus requiring a delay time and causing an interruption of the calibration process. In the current study, an in-situ calibration method for the laser galvanometric scanning head of LPBF machines was developed based on a vision system. The vision system (i.e., a high-resolution monochrome camera) was used to acquire experimental data rapidly during the calibration process, thereby avoiding the laser marking and the measuring phases of laser marks in another location. The acquired experimental data was subsequently used to calculate the correction tables/matrices for calibrating the optical chain of an LPBF machine prototype. The obtained results show that the developed measurement method is acceptable for the in-situ measurement with a good accuracy. After the calibration process, errors between the positions generated by the identified LPBF machine and those measured by the proposed method are very small with an average error of 0.03 mm, and about 80% of positions present an error less than 0.04 mm in the calibration region.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%