A Thin Format Vision-Based Tactile Sensor with A Micro Lens Array (MLA)
This addresses the problem of bulky sensor designs in robotics, enabling more compact and versatile tactile sensing applications, though it is incremental as it builds on existing vision-based methods.
The researchers tackled the bulkiness of vision-based tactile sensors by developing a micro lens array (MLA) system, achieving a thin 5 mm sensor package that provides high-resolution tactile imaging and precise 3D information like displacement mapping and force distribution.
Vision-based tactile sensors have been widely studied in the robotics field for high spatial resolution and compatibility with machine learning algorithms. However, the currently employed sensor's imaging system is bulky limiting its further application. Here we present a micro lens array (MLA) based vison system to achieve a low thickness format of the sensor package with high tactile sensing performance. Multiple micromachined micro lens units cover the whole elastic touching layer and provide a stitched clear tactile image, enabling high spatial resolution with a thin thickness of 5 mm. The thermal reflow and soft lithography method ensure the uniform spherical profile and smooth surface of micro lens. Both optical and mechanical characterization demonstrated the sensor's stable imaging and excellent tactile sensing, enabling precise 3D tactile information, such as displacement mapping and force distribution with an ultra compact-thin structure.