Artificial muscle length sensing sensor and testing device therefor

Length-sensing sensor that measures artificial muscle deformation via resistance changes in conductive knitted fabric

This technology features an elastic knitted layer that wraps around the outer surface of an artificial muscle. By knitting conductive yarn into this layer, the sensor measures changes in the yarn's resistance as the artificial muscle expands or contracts, thereby detecting its deformation.

Conventional microchannel-based EGaIn sensors suffer from channel deformation under high-pressure conditions, which hinders accurate contraction prediction and reduces durability.

This technology utilizes a highly elastic knitted layer with conductive yarn integrated via plain or rib knitting. It prevents separation between the artificial muscle and the sensor layer using fixing loops and clamps, while a braided mesh ensures the conductive band structure remains stable. Suitable for wearable robots, soft actuators, and rehabilitation aids, it ensures accurate contraction prediction and enhanced durability even in high-pressure environments.

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Key Features:

• A knitted layer with interlocking yarn loops that surrounds the outer perimeter of the artificial muscle expansion member
• Fixing loops knitted into the fabric layer to provide conductivity and secure both ends of the layer to the artificial muscle
• Clamps pressure-fitted onto the outer surface of the fixing loops to prevent separation between the artificial muscle and the knitted layer
• A braided mesh that surrounds the outer perimeter of the conductive fabric or band and is positioned between the fixing loops and the clamps

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This invention was developed with support from the Ministry of Science and ICT for the development of biomimetic bionic arm mechanisms.