Experiment name: Full-field scanning laser vibration measurement.
Research direction: Tactile feedback
The purpose of the experiment: Based on the tactile feedback device, by exciting the resonance between the piezoelectric material and the substrate to obtain a larger amplitude, adjust the surface friction of the substrate, so as to realize the texture reproduction of the surface of the object.
Experimental content: When the substrate is excited with an out-of-plane displacement of more than 1 micron at the ultrasonic frequency, the human finger can clearly feel the change of friction force when touching it, which is called surface tactile feedback based on friction force modulation. In this study, based on the glass-based piezoelectric materials, designed and fabricated highly transparent tactile devices. Excitation with a 22.5kHz, 10 V sine wave produced a displacement of 1 micron on the vibrating plate, which is standard for commercial applications. When the voltage was increased to 24V, the displacement reached 4 microns. The average transmittance of the entire tactile reproduction device reached 75%. This study provides a theoretical and experimental basis for designing a new generation of haptic devices embedded in touchscreen displays.
Test equipment: signal generator, power amplifier SLA-100-720, test device, laser vibrometer, etc.
Experimental process: Use the SLA-100-720 amplifier to provide electrical signal excitation for the tactile feedback device. The available effective voltage, effective current, phase difference and active power are 5.85 V, 799 mA, 40° and 3.58 W, respectively.
Test results: In the ultrasonic frequency band, extremely high amplitude is obtained under unit driving voltage, the amplitude under 10V voltage is 1 micron, and the acceleration is about 30 km/s, which meets the commercial application standard. The displacement under 24 V voltage is as high as 4 microns, which is at the international leading level.
