Multi-Sensor Registration in High-Precision CMM Based on a Composite Standard.

Area of Science:

• Metrology and Measurement Science
• Mechanical Engineering
• Sensor Technology

Background:

• Accurate registration is crucial for multi-sensor dimensional measurement.
• Reference spheres present limitations in high-precision applications.
• Existing methods struggle with fusing heterogeneous sensors effectively.

Purpose of the Study:

• To introduce a novel composite standard for high-precision sensor registration.
• To overcome the drawbacks associated with traditional reference spheres.
• To enable stable fusion of multiple heterogeneous sensors in coordinate measuring machines (CMMs).

Main Methods:

• A composite standard comprising a cone and cylinder sharing a central axis was designed and manufactured using ultra-precision machining.
• Three sensors—a video camera (VC), tactile probe (TP), and chromatic confocal displacement sensor (CC)—inspected the standard's features.
• Theoretical error analysis, simulations, and real experiments were conducted to validate the method.

Main Results:

• The composite standard enables high-precision registration in the submicron range.
• The proposed method successfully fuses heterogeneous sensors (VC, TP, CC).
• Experimental results confirm the stability and effectiveness of the registration method.

Conclusions:

• The novel composite standard offers a viable alternative to reference spheres for high-precision registration.
• The developed method provides stable and accurate fusion of multiple sensors.
• This approach has significant potential for advancing multi-sensor dimensional measurement technologies.