Distance measurement system

The distance measurement system addresses limitations in laser processing by using sensor regions with varying radiation distribution and a processor to achieve precise and swift distance measurements, enhancing laser marking systems' accuracy and efficiency.

WO2026146077A1PCT designated stage Publication Date: 2026-07-09ALLTEC ANGEWANDTE LASER LICHT TECH GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ALLTEC ANGEWANDTE LASER LICHT TECH GMBH
Filing Date
2025-12-23
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Existing distance measurement systems in laser processing are limited in working distance range, accuracy, speed, size, and cost, making them unsuitable for many applications, especially in laser marking systems where focal length varies due to non-flat targets or beam steering.

Method used

A distance measurement system with first and second sensor regions that generate proportional signals based on measurement radiation, using an optical arrangement to introduce an unequal distribution of radiation varying with distance, and a processor to determine distance based on a mathematical relationship, allowing for accurate and fast measurements across a wide range.

Benefits of technology

Provides accurate (0.1% accuracy) and fast (10-40 ps) distance measurements over 50mm to 250mm, while being compact and cost-effective, suitable for mass production.

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Abstract

Measurement apparatus A distance measurement system comprises a first sensor region configured to generate a first signal that is proportional to an amount of measurement radiation incident on the first sensor region and a second sensor region configured to generate a second signal that is proportional to an amount of measurement radiation incident on the second sensor region. A sensor lens is configured to receive measurement radiation from a target and illuminate the first and second sensor regions with the measurement radiation. An optical arrangement is configured to introduce an unequal distribution of measurement radiation between the first and second sensor regions that varies with a distance between the sensor lens and the target in accordance with a mathematical relationship. A processor is configured to determine a distance between the distance measurement system and the target at least partly based on the first and second signals and the mathematical relationship.
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