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A two-dimensional laser scanning mirror using motion-decoupling electromagnetic actuators.

Shin BH, Oh D, Lee SY - Sensors (Basel) (2013)

Bottom Line: The upper moving-coil type actuator to rotate only the mirror part has the optical reflection angle of 15.7° at 10 Hz, 90° at the resonance frequency of 60 Hz at ±3 V (±70 mA) and the bandwidth of 91 Hz.The lower moving-magnet type actuator has the optical reflection angle of 16.20° at 10 Hz and 50° at the resonance frequency of 60 Hz at ±5 V (±34 mA) and the bandwidth of 88 Hz.The proposed compact and simple 2-D scanning mirror has advantages of large 2-D angular deflections, wide frequency bandwidth and low manufacturing cost.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Sogang University, 1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea.

ABSTRACT
This work proposes a two-dimensional (2-D) laser scanning mirror with a novel actuating structure composed of one magnet and two coils. The mirror-actuating device generates decoupled scanning motions about two orthogonal axes by combining two electromagnetic actuators of the conventional moving-coil and the moving-magnet types. We implement a finite element analysis to calculate magnetic flux in the electromagnetic system and experiments using a prototype with the overall size of 22 mm (W) × 20 mm (D) × 15 mm (H) for the mirror size of 8 mm × 8 mm. The upper moving-coil type actuator to rotate only the mirror part has the optical reflection angle of 15.7° at 10 Hz, 90° at the resonance frequency of 60 Hz at ±3 V (±70 mA) and the bandwidth of 91 Hz. The lower moving-magnet type actuator has the optical reflection angle of 16.20° at 10 Hz and 50° at the resonance frequency of 60 Hz at ±5 V (±34 mA) and the bandwidth of 88 Hz. The proposed compact and simple 2-D scanning mirror has advantages of large 2-D angular deflections, wide frequency bandwidth and low manufacturing cost.

No MeSH data available.


Related in: MedlinePlus

The experiment setup to measure reflection angles. (a) A prototype of the 2-D mirror scanning system, (b) the measurement of the torque of the mirror by a load cell, (c) the measurement of the torque of the frame by a load cell, (d) the displacement measurement of mirror, (e) the measurement of laser beam.
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f3-sensors-13-04146: The experiment setup to measure reflection angles. (a) A prototype of the 2-D mirror scanning system, (b) the measurement of the torque of the mirror by a load cell, (c) the measurement of the torque of the frame by a load cell, (d) the displacement measurement of mirror, (e) the measurement of laser beam.

Mentions: In order to measure the dynamic performances of the 2-D scanning mirror system, we manufactured a prototype as shown in Figure 3(a). The thin glass mirror is attached to the plastic mirror mold. And then the coil and pin are inserted into the plastic mirror mold. The size of the mirror is 8 mm × 8 mm and the overall size of the scanning mirror system is 22 mm (W) × 20 mm (D) × 15 mm (H). The moving frame is made of plastic using a rapid prototyping process to reduce inertia. The total mass of the moving parts is 1.45g. Magnet material is ND45. The coil in the mirror part has 712 turns and 42 Ω, but the coil at the base has 1,312 turns and 145Ω. The material of the core yoke of the base coil is steel (S45C) and the material of the base frame is duralumin (A7075).


A two-dimensional laser scanning mirror using motion-decoupling electromagnetic actuators.

Shin BH, Oh D, Lee SY - Sensors (Basel) (2013)

The experiment setup to measure reflection angles. (a) A prototype of the 2-D mirror scanning system, (b) the measurement of the torque of the mirror by a load cell, (c) the measurement of the torque of the frame by a load cell, (d) the displacement measurement of mirror, (e) the measurement of laser beam.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3673076&req=5

f3-sensors-13-04146: The experiment setup to measure reflection angles. (a) A prototype of the 2-D mirror scanning system, (b) the measurement of the torque of the mirror by a load cell, (c) the measurement of the torque of the frame by a load cell, (d) the displacement measurement of mirror, (e) the measurement of laser beam.
Mentions: In order to measure the dynamic performances of the 2-D scanning mirror system, we manufactured a prototype as shown in Figure 3(a). The thin glass mirror is attached to the plastic mirror mold. And then the coil and pin are inserted into the plastic mirror mold. The size of the mirror is 8 mm × 8 mm and the overall size of the scanning mirror system is 22 mm (W) × 20 mm (D) × 15 mm (H). The moving frame is made of plastic using a rapid prototyping process to reduce inertia. The total mass of the moving parts is 1.45g. Magnet material is ND45. The coil in the mirror part has 712 turns and 42 Ω, but the coil at the base has 1,312 turns and 145Ω. The material of the core yoke of the base coil is steel (S45C) and the material of the base frame is duralumin (A7075).

Bottom Line: The upper moving-coil type actuator to rotate only the mirror part has the optical reflection angle of 15.7° at 10 Hz, 90° at the resonance frequency of 60 Hz at ±3 V (±70 mA) and the bandwidth of 91 Hz.The lower moving-magnet type actuator has the optical reflection angle of 16.20° at 10 Hz and 50° at the resonance frequency of 60 Hz at ±5 V (±34 mA) and the bandwidth of 88 Hz.The proposed compact and simple 2-D scanning mirror has advantages of large 2-D angular deflections, wide frequency bandwidth and low manufacturing cost.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Sogang University, 1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea.

ABSTRACT
This work proposes a two-dimensional (2-D) laser scanning mirror with a novel actuating structure composed of one magnet and two coils. The mirror-actuating device generates decoupled scanning motions about two orthogonal axes by combining two electromagnetic actuators of the conventional moving-coil and the moving-magnet types. We implement a finite element analysis to calculate magnetic flux in the electromagnetic system and experiments using a prototype with the overall size of 22 mm (W) × 20 mm (D) × 15 mm (H) for the mirror size of 8 mm × 8 mm. The upper moving-coil type actuator to rotate only the mirror part has the optical reflection angle of 15.7° at 10 Hz, 90° at the resonance frequency of 60 Hz at ±3 V (±70 mA) and the bandwidth of 91 Hz. The lower moving-magnet type actuator has the optical reflection angle of 16.20° at 10 Hz and 50° at the resonance frequency of 60 Hz at ±5 V (±34 mA) and the bandwidth of 88 Hz. The proposed compact and simple 2-D scanning mirror has advantages of large 2-D angular deflections, wide frequency bandwidth and low manufacturing cost.

No MeSH data available.


Related in: MedlinePlus