Cross-Web Temperature Sensor Array With Rotating Calibration Protection
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Solution Overview
Problem
Existing methods for measuring web temperature are inadequate as they fail to provide continuous and simultaneous temperature measurements across the entire width of the web, are limited by the need for clear visibility, and are not suitable for confined or harsh environments, leading to inefficiencies in heating and drying processes and potential quality issues in web production.
Innovation Solution
A contactless temperature measurement arrangement featuring a plurality of sensors housed in an elongated chamber with a data bus, positioned transversely to the web's direction of movement, allowing for rapid and simultaneous temperature measurement across the web's width, with protective features and automatic calibration, enabling reliable operation in challenging environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a point measurement sensor is used, then the measurement speed is fast, but the coverage area is limited and cross-web temperature variations are not detected
Solution Approach 1:
The measurement system is segmented into multiple independent pyrometer sensors arranged in an array across the web width. Each pyrometer measures temperature at a specific transverse position, and together they provide comprehensive cross-web temperature profiling while maintaining the fast response characteristics of point measurement sensors.
Solution Approach 2:
The measurement approach transitions from one-dimensional point measurement to two-dimensional temperature mapping by arranging multiple sensors across the transverse dimension of the web. This allows simultaneous temperature measurement across the entire web width while maintaining fast measurement speed at each point.
2Area of stationary object
If a line scanner with free visibility is used, then the measurement coverage is improved, but the device cannot be placed in confined spaces
Solution Approach 1:
Multiple pyrometer sensors are nested within a common housing structure that provides protection and positioning. The sensors are arranged in an array within the confined housing, allowing the system to maintain comprehensive measurement coverage while fitting into the limited space available on the paper machine.
Solution Approach 2:
The system achieves two-dimensional temperature mapping across the web width by arranging sensors in the transverse direction within a compact housing, eliminating the need for extended free visibility in the longitudinal direction that would be required by traditional line scanners.
3Measurement precision
If sensors are exposed in a harsh environment, then the measurement capability is maintained, but the reliability is reduced due to high temperatures and dirty conditions
Solution Approach 1:
A transparent protective window or film is used to seal the sensor housing while allowing infrared radiation to pass through to the pyrometer sensors. This protective barrier shields the sensors from harsh environmental conditions including high temperatures, moisture, and contaminants while maintaining measurement capability.
Solution Approach 2:
The sensor housing creates a protected internal environment that isolates the pyrometer sensors from the harsh external conditions on the paper machine. This inert or controlled atmosphere within the housing preserves sensor reliability and longevity while allowing continuous temperature measurement through the protective window.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient, continuous, and simultaneous temperature measurement across the web's width, improving web quality, reducing energy consumption, and identifying potential machine malfunctions, while being compact and durable enough for use in confined and harsh conditions.
Implementation Method 1
a plurality of sensors for contactless measuring of the temperature
Data Source
AI summary
The present invention relates to an arrangement (1) for measuring the temperature of a web. The arrangement (1) comprises a plurality of sensors (3) for contactless measuring of the temperature, an elongated housing (5) intended for extending essentially along a transverse direction (T) which is transverse to the direction of movement of a web. The sensors (3) are arranged in a chamber (6) within the housing (5) and spread along the front side (7a) of the housing (5). Each sensor (3) is connected to a data bus (9) for providing information of the measured temperature to other systems and/or apparatuses. The sensors (3) are attached to a support structure (19) having at least one rotatable shaft (23) in the interior of the housing (7), and wherein the shaft (23) is arranged to rotate the support structure (19) such that the sensors (3) are displaced to a calibration and/or protection position away from the openings (11) for calibration and/or protection of the sensors (3). The invention also relates to a method for measuring the temperature of a web, a computer program, a computer readable medium and a control unit.