Pinching accidents involving thin bags, canes used by the blind, or stroller wheels are a serious problem. To date, only a few studies have investigated the anti-pinch system of train doors. Hence, this paper proposes a novel pinching sensor that utilizes the acoustic characteristics inside an elastic tube. To investigate whether a highly sensitive sensor can be realized, the sensitivity was experimentally measured. In particular, we investigated whether a displacement of 1 mm can be detected along door rubber tubes, with a length of 2200 mm. First, we conducted load detection experiments for a conventional door rubber tube with an inner diameter of 15 mm. The sensor system comprises an earphone, a microphone, and an elastic tube. By adopting sweep signals of 0.5–4.5 kHz, power spectra inside the rubber were obtained, and the position responses were calculated via Fourier transform. Subsequently, we determined the applied loads based on the peak ratios. The subtraction method was adopted to detect small displacements (=1 mm). The obtained results indicated that displacements of 1 mm could be detected from 100 to 1400 mm. Next, load sensing experiments were conducted using five different types of door rubber tubes, and the obtained results indicated that the proposed method can be applied to both the widely used rubber tube, as well as in other types of door rubber tubes. Based on these results, we verified that the proposed system can be adopted as a highly sensitive pinching sensor system.

涉及薄袋、盲人使用的手杖或婴儿车轮子的夹伤事故是一个严重的问题。迄今为止，只有少数研究调查了列车车门的防夹系统。因此，本文提出了一种利用弹性管内声学特性的新型挤压传感器。为了研究是否可以实现高灵敏度传感器，通过实验测量了灵敏度。特别是，我们研究了是否可以检测到沿门橡胶管（长度为 2200 毫米）的 1 毫米位移。首先，我们对内径为 15 mm 的常规门橡胶管进行了载荷检测实验。传感器系统包括耳机、麦克风和弹性管。通过采用0.5-4.5 kHz的扫描信号，获得了橡胶内部的功率谱，并且通过傅立叶变换计算位置响应。随后，我们根据峰值比率确定了施加的载荷。采用减法方法检测小位移（=1 mm）。获得的结果表明，从 100 到 1400 毫米可以检测到 1 毫米的位移。接下来，使用五种不同类型的门胶管进行了负载传感实验，所得结果表明所提出的方法既适用于广泛使用的胶管，也适用于其他类型的门胶管。基于这些结果，我们验证了所提出的系统可以用作高灵敏度挤压传感器系统。采用减法方法检测小位移（=1 mm）。获得的结果表明，从 100 到 1400 毫米可以检测到 1 毫米的位移。接下来，使用五种不同类型的门胶管进行了负载传感实验，所得结果表明所提出的方法既适用于广泛使用的胶管，也适用于其他类型的门胶管。基于这些结果，我们验证了所提出的系统可以用作高灵敏度挤压传感器系统。采用减法方法检测小位移（=1 mm）。获得的结果表明，从 100 到 1400 毫米可以检测到 1 毫米的位移。接下来，使用五种不同类型的门胶管进行了负载传感实验，所得结果表明所提出的方法既适用于广泛使用的胶管，也适用于其他类型的门胶管。基于这些结果，我们验证了所提出的系统可以用作高灵敏度挤压传感器系统。以及其他类型的门橡胶管。基于这些结果，我们验证了所提出的系统可以用作高灵敏度挤压传感器系统。以及其他类型的门橡胶管。基于这些结果，我们验证了所提出的系统可以用作高灵敏度挤压传感器系统。