A Highly Sensitive 3D-Printed Flexible Sensor for Sensing Small Pressures in Deep-Sea High-Pressure Environment

Area of Science:

• Marine Robotics
• Biomimetic Engineering
• Sensor Technology

Background:

• Deep-sea exploration is vital for understanding Earth's origins and resources.
• Current deep-sea operations are hindered by limitations in robotic manipulation, specifically the lack of sensitive force sensors.
• Integrating effective pressure sensors with mechanical hands is crucial for enhancing deep-sea robotic capabilities.

Purpose of the Study:

• To develop a flexible stress sensor capable of functioning under high hydrostatic pressure in deep-sea environments.
• To create a sensor that can be integrated with deep-sea robots for precise manipulation tasks.
• To provide a robust sensing solution for extreme underwater conditions.

Main Methods:

• A biomimetic design inspired by abyssal zone organisms was employed, featuring a hollow interlocking spherical structure for internal and external pressure balance.
• Finite element simulation was used to optimize structural parameters.
• Digital Light Processing (DLP) three-dimensional (3D) printing technology was utilized for fabricating the complex sensor structure.

Main Results:

• The sensor demonstrated linear sensitivity of 0.114 kPa⁻¹ within the 0-15 kPa range and a rapid response time of 32 ms.
• It exhibited excellent dynamic-static load response and cycling stability.
• Remarkably high sensitivity of 1.74 kPa⁻¹ was achieved under 30 MPa static water pressure, with a theoretical working pressure exceeding 110 MPa.

Conclusions:

• The developed flexible stress sensor offers a viable solution for deep-sea robotic manipulation under extreme hydrostatic pressures.
• The biomimetic design and 3D printing approach enable robust and sensitive pressure sensing in challenging marine environments.
• This innovation has the potential to significantly advance the capabilities of underwater robots in exploration and resource utilization.