Abstract
With the wide application of laser in the field of skin plastic surgery, micro laser galvanometer scanner has made great progress in this field with its portability. However, the measurement method used to measure the deflection angle of laser galvanometer in the narrow space of scanner with high precision remains to be studied. In this paper, an angle measurement method based on magnetic field is proposed, and the effect of the shapes of permanent magnets (PMs) on the measurement is studied by theoretical and experimental study under the condition that the maximum available space for the PMs is a 10 mm side cube. An angle measuring experimental device is set up, and the contrast experiment is carried out with different PMs which are the same as simulation. The experimental results show that cylindrical PM is more suitable than other PMs, which is consistent with the simulation results, and the maximum nonlinearity error is 0.562%. This method has the advantages of small volume, non-contact measurement, small moment of inertia, good dynamic response and no external excitation for the PMs, so it has a broad application prospect in micro laser galvanometer scanner.
Highlights
Micro laser galvanometer scanner has important applications in the field of skin plastic surgery, such as in scar removal surgery
This method has the advantages of small volume, non-contact measurement, small moment of inertia, good dynamic response and magnet without external excitation
It is very suitable for the measurement of laser galvanometer deflection angle in the micro laser galvanometer scanner
Summary
Micro laser galvanometer scanner has important applications in the field of skin plastic surgery, such as in scar removal surgery. The angle measurement of the galvanometer is an important part of the micro laser galvanometer scanner, which has an important effect on the accurate positioning and precise cutting of the laser It requires measurement methods with small volume, good dynamic response, low rotational moment inertia and strong anti-interference ability.[1,2,3,4,5,6,7]. The measurement method based on magnetic field is to measure the deflection angle by using the combination of the permanent magnets (PMs) and the magnetic sensor. An angle measurement method based on magnetic field in a narrow space is proposed, and the effect of the shapes of PMs on the measurement is explored
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