Development of a nanoscale displacement sensor based on the shadow method

Area of Science:

• Biomimetics and Micro-sensor Technology
• Optics and Nanotechnology

Background:

• Traditional micro-displacement sensors face limitations in resolution and complexity.
• Biomimicry offers novel approaches for developing advanced sensing mechanisms.

Purpose of the Study:

• To develop and demonstrate a novel bionic coaxial micro-displacement sensor.
• To utilize the water's unique properties for ultra-precision measurements.

Main Methods:

• A bionic sensor inspired by the water strider's locomotion was designed.
• A superhydrophobic surface induced a meniscus in water for displacement detection.
• A shadow method utilizing light refraction through the meniscus was employed for measurement.

Main Results:

• The sensor achieved a maximum coaxial displacement sensitivity of 62 nm/pixel.
• The measurement was demonstrated over a displacement range of 50 µm.
• A linearity error of 1.58% was recorded within the measurement range.

Conclusions:

• The developed bionic sensor offers a high-resolution method for micro-displacement measurement.
• The sensor's simple structure and high sensitivity make it suitable for ultra-precision applications.
• This technology holds potential for advancements in fields requiring precise nanoscale measurements.