Laser linear encoder with both high fabrication and head-to-scale tolerances.

Area of Science:

• Optics and Photonics
• Metrology
• Mechanical Engineering

Background:

• Diffractive laser encoders are crucial for high-precision measurement systems.
• Existing designs often face limitations in manufacturing and alignment tolerances.
• Wider applicability requires robust optical configurations.

Purpose of the Study:

• To introduce and analyze a new optical head configuration for a diffractive laser encoder.
• To enhance manufacturing and head-to-scale alignment tolerances.
• To evaluate the measurement performance and accuracy of the new design.

Main Methods:

• Detailed discussion of the encoder's measurement principles.
• Optimization of the grating shape for improved performance.
• Analysis of optical component arrangement and its impact on measurement error.
• Determination of head-to-scale alignment tolerance.

Main Results:

• The new configuration demonstrates high manufacturing and alignment tolerances.
• Optimized grating shape and component arrangement minimize measurement error.
• Measurement accuracy achieved was 37.3 nm with a standard deviation of 25.4 nm under non-ideal conditions.

Conclusions:

• The developed optical head configuration significantly improves the applicability of diffractive laser encoders.
• The design offers robust performance with high accuracy even in non-environmentally controlled settings.
• This advancement holds potential for broader industrial and scientific applications requiring precise measurements.