Soft pressure sensors have recently attracted considerable attention because of their applications in human–machine interface, soft robotics, and prosthetics. However, there remain some challenges in achieving satisfactory performance (e.g., high sensitivity, wide sensing range, high stability) for soft pressure sensors. This article reports an intentional blocking based photoelectric pressure sensor. Two different blocking methods are investigated: the single-row-pyramid blocking and the double-row-pyramid blocking. The sensor has a simple structure, which is made of a light-emitting diode, photosensitive element, and silicone sensor shell. Experiments demonstrate that the sensor has a high sensitivity (the maximum sensitivity is 48.07 kPa⁻¹, and the minimum measurement pressure is 0.8 Pa), large pressure-sensing range (the sensing range is up to 120 kPa), superior stability (a drift about 0.4% over 12,130 repetitive cycles at 0–80 kPa), low drift (< ±0.2% in different 3-day testing), negligible hysteresis, and high signal-to-noise ratio (over 55 dB). By mounting the pressure sensor at the end of a robotic arm, the robot can detect subtle collisions (such as touching a balloon through a pinpoint). In addition, this article fabricates a tactile glove based on the proposed pressure sensor and shows the application of this glove for music playing and object weighing. This study provides a new structure for photoelectric sensors to increase sensitivity and also provides a more convenient way to fabricate photoelectric pressure sensors.

中文翻译：

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具有高灵敏度和稳定性的基于故意阻塞的光电软压力传感器

软压力传感器最近因其在人机界面、软机器人和假肢中的应用而引起了相当大的关注。然而，软压力传感器在实现令人满意的性能（例如，高灵敏度、宽传感范围、高稳定性）方面仍然存在一些挑战。本文报道了一种基于故意阻塞的光电压力传感器。研究了两种不同的阻塞方法：单排金字塔阻塞和双排金字塔阻塞。该传感器结构简单，由发光二极管、光敏元件和硅胶传感器外壳组成。实验表明该传感器具有较高的灵敏度（最大灵敏度为48.07 kPa ⁻¹, 最小测量压力为0.8 Pa), 压力传感范围大(传感范围可达120 kPa), 稳定性好(0~80 kPa下12,130次重复循环漂移约0.4%), 漂移小(<在不同的 3 天测试中为 ±0.2%），滞后可忽略不计，信噪比高（超过 55 dB）。通过在机械臂末端安装压力传感器，机器人可以检测到细微的碰撞（例如通过精确点触摸气球）。此外，本文基于所提出的压力传感器制作了一种触觉手套，并展示了这种手套在音乐播放和物体称重方面的应用。该研究为光电传感器提供了一种新的结构以提高灵敏度，也为制造光电压力传感器提供了一种更方便的方法。