Specialists from Perm National Research Polytechnic University (PNRPU) have developed a mathematical model that significantly improves touch recognition on acoustic touchscreens.
The technology makes it possible to determine the coordinates of a touch with an accuracy of up to 0.1 millimeters, even when exposed to vibrations, moisture, dust, or mechanical damage. This opens up opportunities for using devices in mines, chemical plants, oil platforms, robotics, and the space industry.
Acoustic touchscreens record sound waves that occur when the surface is touched. Signals are captured by microphones, and algorithms calculate the location of the touch based on the speed of sound and the time it takes to travel. However, existing methods required complex designs with a large number of sensors or special materials, and accuracy was often limited to one meter.
The new model simplifies the system: three microphones located at the corners of the screen are sufficient for operation. Scientists have found that the optimal placement is in the form of a right triangle with sensors at the maximum distance from the center. This reduces the cost of devices and increases reliability, as it eliminates dependence on fragile additional elements.
Experiments in SciLab and specialized software have confirmed the effectiveness of the solution. The algorithm reduces the number of calculations to 2–4 cycles, ensuring fast response. The initial parameters of the system are set in the center of the screen, which minimizes error. According to researchers, the approach provides close to 100% accuracy even in harsh environments.
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