Yang Jiayi, Chen Yuanyuan, Liu Shuoyan, Liu Chang, Ma Tian, Luo Zhenmin, Ge Gang
College of Computer Science and Technology, Xi'an University of Science and Technology, Xi'an 710054, China.
College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
Micromachines (Basel). 2023 Aug 3;14(8):1554. doi: 10.3390/mi14081554.
Flexible stress sensor arrays, comprising multiple flexible stress sensor units, enable accurate quantification and analysis of spatial stress distribution. Nevertheless, the current implementation of flexible stress sensor arrays faces the challenge of excessive signal wires, resulting in reduced deformability, stability, reliability, and increased costs. The primary obstacle lies in the electric amplitude modulation nature of the sensor unit's signal (e.g., resistance and capacitance), allowing only one signal per wire. To overcome this challenge, the single-line multi-channel signal (SLMC) measurement has been developed, enabling simultaneous detection of multiple sensor signals through one or two signal wires, which effectively reduces the number of signal wires, thereby enhancing stability, deformability, and reliability. This review offers a general knowledge of SLMC measurement beginning with flexible stress sensors and their piezoresistive, capacitive, piezoelectric, and triboelectric sensing mechanisms. A further discussion is given on different arraying methods and their corresponding advantages and disadvantages. Finally, this review categorizes existing SLMC measurement methods into RLC series resonant sensing, transmission line sensing, ionic conductor sensing, triboelectric sensing, piezoresistive sensing, and distributed fiber optic sensing based on their mechanisms, describes the mechanisms and characteristics of each method and summarizes the research status of SLMC measurement.
包含多个柔性应力传感器单元的柔性应力传感器阵列，能够对空间应力分布进行精确量化和分析。然而，目前柔性应力传感器阵列的实现面临信号线过多的挑战，导致可变形性、稳定性、可靠性降低，成本增加。主要障碍在于传感器单元信号（如电阻和电容）的电幅度调制特性，每根导线只能传输一个信号。为克服这一挑战，已开发出单线多通道信号（SLMC）测量方法，可通过一根或两根信号线同时检测多个传感器信号，有效减少了信号线数量，从而提高了稳定性、可变形性和可靠性。本文综述从柔性应力传感器及其压阻、电容、压电和摩擦电传感机制入手，介绍了SLMC测量的一般知识。进一步讨论了不同的阵列方法及其相应的优缺点。最后，本文综述根据现有SLMC测量方法的机制，将其分为RLC串联谐振传感、传输线传感、离子导体传感、摩擦电传感、压阻传感和分布式光纤传感，描述了每种方法的机制和特点，并总结了SLMC测量的研究现状。
