Hybrid basis weight sensor

The hybrid basis weight measurement system addresses the limitations of existing systems by combining nucleonic and infrared sensors to achieve accurate and noise-reduced measurements, effectively overcoming challenges related to sensor limitations and regulatory constraints.

WO2025067670A1 Publication Date: 2025-04-03ABB (SCHWEIZ) AG
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Patent Information

Application Number
PCT/EP2023/076968
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Existing basis weight measurement systems for paper face challenges in achieving accurate and noise-free measurements due to limitations in nucleonic and infrared sensors, particularly with restricted availability of isotopes and stringent radiation protection requirements.

Method used

A hybrid basis weight measurement system combining a nucleonic sensor with an infrared measuring device configured to measure infrared light independently at multiple spectral regions, where the spectral response at specific wavelengths differs by a factor of at least 2, and an analysis device to combine data from both sensors for accurate basis weight determination.

Benefits of technology

The hybrid system provides improved accuracy and reduced noise in basis weight measurements by effectively utilizing the strengths of both nucleonic and infrared sensors across different spectral regions, while minimizing regulatory and operational constraints.

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Abstract

A basis weight measurement system for measuring the basis weight of a paper sheet comprising a nucleonic sensor; an infrared measuring device configured for measuring infrared light independently at at least two spectral regions, wherein for at least a first one of the spectral regions the spectrum of light measured is restricted such that the spectral response of the infrared measuring device at a wavelength of 1.954 µm differs from the spectral response of the infrared measuring device at a wavelength of 2.1 µm by at least a factor of 2 when the infrared measuring device is measuring at the first spectral region, and an analysis device comprising a data input interface configured to receive data from the nucleonic sensor and the infrared measuring device and a basis weight determining module configured to determine a basis weight of the paper sheet by combining the data obtained from the nucleonic senor and from the infrared measuring device.
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