[Paper Review] Length traceability chain based on chromium atom transition frequency

Xiao Deng, Zichao Lin+11 more|arXiv (Cornell University)|Feb 23, 2023

Advanced Measurement and Metrology Techniques7 citations

TL;DR

Proposes a length traceability chain that uses chromium atom transition frequency, combining fundamental constant accuracy with grating interferometry for self-calibration in situ.

ABSTRACT

Precise positioning measurement plays an important role in in today advanced manufacturing industry, and length traceability chain has been optimizing and enriching to fulfill the developing and various precise positioning requirement. In this paper, we propose a new length traceability chain based on chromium atom transition frequency, which is a combining utilization of fundamental physical constant accuracy and grating interferometer environmental robustness. The selftraceable grating pitch standard, the selftraceable angle standard and the selftraceable grating interferometer are promising to improve the measurement accuracy, consistency and selfcalibration ability in situ for precise positioning.

Motivation & Objective

• Motivate precise positioning needs in modern manufacturing and the role of length traceability.
• Introduce a chromium-atom-transition-frequency-based length traceability chain.
• Leverage self-traceable standards (grating pitch, angle, and interferometer) to improve accuracy, consistency, and self-calibration in situ.

Proposed method

• Propose a length traceability chain using chromium atom transition frequency as a fundamental reference.
• Couple self-traceable standards: grating pitch standard, angle standard, and grating interferometer.
• Discuss how these standards enhance environmental robustness and measurement accuracy in a positioning system.

Experimental results

Research questions

• RQ1 Can chromium atom transition frequency provide a reliable fundamental reference for length traceability in precision positioning?
• RQ2 How do self-traceable grating pitch and angle standards, combined with a self-traceable grating interferometer, improve in situ calibration and measurement accuracy?

Key findings

• The proposed chain aims to improve measurement accuracy, consistency, and self-calibration ability in precise positioning.
• The approach combines fundamental physical constant accuracy with environmental robustness of grating-based methods.