A Stretchable Capacitive Strain Sensor Having Adjustable Elastic Modulus Capability for Wide‐Range Force Detection,Advanced Engineering Materials

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A Stretchable Capacitive Strain Sensor Having Adjustable Elastic Modulus Capability for Wide‐Range Force Detection
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2019-12-17 , DOI: 10.1002/adem.201901239
Peng-Juan Cao _{1,

2,

3} , Yiwei Liu _{2,

3,

4} , Waqas Asghar _{2,

3} , Chao Hu _{2,

3} , Fali Li _{2,

3} , Yuanzhao Wu _{2,

3} , Yunyao Li _{2,

3,

5} , Zhe Yu _{2,

3} , Shengbin Li _{2,

3} , Jie Shang _{2,

3,

4} , Xincai Liu ₁ , Run-Wei Li _{2,

3,

4}

Affiliation

Stretchable strain sensors are important components of soft robotics, rehabilitation assistance, and human health monitoring systems. However, strain sensors capable of wide‐range force detection with adjustable modulus facilities are highly desirable to obtain mechanical feedback in various scenarios. Herein, a stretchable capacitive strain sensor capable of adjustable modulus and wide‐range force detection is reported. The sensor consists of two liquid metals (LMs) filled thermoplastic elastomer (TPE) tubes encapsulated in flexible silicone. The adjustable modulus capability of the sensor is attained by mounting the sensor with springs of different elastic coefficients. During electromechanical tests, the elastic coefficient‐dependent adjustable modulus is obtained in the range of 0.78–10.3 MPa. After optimizing the performance, a sensor capable of wide force‐sensing range (0.07–74 N), high cyclic stability (>3500 cycles), with low hysteresis, good linearity, and fast response time (<50 ms) is achieved. Finally, a digital display system is developed to display the amount of detected force during the loading of the sensor, which confirms the great capability of the sensor to be applied in joint rehabilitation and soft robotic fields.

中文翻译：

具有可调节弹性模量的可拉伸电容式应变传感器，用于宽范围力检测

可拉伸应变传感器是软机器人，康复辅助和人体健康监测系统的重要组成部分。但是，非常需要能够通过可调模量工具进行大范围力检测的应变传感器，以在各种情况下获得机械反馈。在此，报道了一种具有可调模数和宽范围力检测能力的可拉伸电容应变传感器。该传感器由两个液态金属（LM）填充的热塑性弹性体（TPE）管组成，并封装在柔性硅树脂中。通过将传感器安装在具有不同弹性系数的弹簧上，可以实现传感器的可调模量功能。在机电测试过程中，获得的弹性系数可调节模量在0.78-10.3 MPa的范围内。优化性能后，实现了一种传感器，该传感器具有宽的力感范围（0.07–74 N），高的循环稳定性（> 3500个循环），低的滞后性，良好的线性度和快速的响应时间（<50 ms）。最后，开发了一种数字显示系统来显示传感器加载过程中检测到的力的大小，这证实了该传感器在关节康复和软机器人领域中具有巨大的应用能力。

更新日期：2019-12-17

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