Deflection Detection Using Blocking Device in Scanning Apparatus
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Solution Overview
Problem
Existing scanning apparatuses in sheet-making processes face challenges in accurately detecting deflections between the source and detection modules, which affect measurement precision, especially in older systems where mechanical or magnetic alignment sensors are not feasible for installation or upgrade.
Innovation Solution
A method using a removable blocking device that partially blocks the radiation impinging on the detection module's aperture, allowing for the detection of deflections through a partially-blocked scanning process, which enables diagnostics and maintenance of the scanning apparatus without requiring additional sensors or mechanical alterations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical dial indicators or magnetic alignment sensors are mounted on the carriages to detect misalignments, then measurement precision of deflection is improved, but device complexity and ease of manufacture worsen due to bulky components and difficult installation requiring mechanical alterations
Solution Approach 1:
The patent extracts the deflection detection function from separate mechanical or magnetic sensors and integrates it into the existing radiation detection module by using a blocking device that modulates the radiation signal. This eliminates the need for additional alignment sensors and their complex installation procedures.
Solution Approach 2:
The detection module is made multi-functional by enabling it to perform both its original radiation detection function and the additional deflection detection function through the blocking device. This universal approach allows one component to serve multiple purposes, reducing overall system complexity.
2Measurement precision
If magnetic alignment sensors like Hall-effect sensors are added to an existing scanning apparatus, then deflection detection capability is improved, but ease of manufacture and adaptability worsen due to significant software changes and mechanical alterations required
Solution Approach 1:
The existing detection module serves itself by detecting deflections through the blocking device's modulation of the radiation signal. This self-service approach allows the system to perform deflection detection without requiring external alignment sensors or significant modifications to the existing apparatus.
Solution Approach 2:
The patent changes the operational parameters of the existing detection module by introducing the blocking device that modulates the radiation signal. This parameter change enables deflection detection using the same hardware infrastructure, improving adaptability across different scanning apparatus generations.
3Reliability
If new sensors and mechanical components are added to detect deflections, then reliability of deflection detection is improved, but loss of time and productivity worsen due to extended maintenance requirements and system complexity
Solution Approach 1:
The patent merges the deflection detection function with the existing radiation detection system by using the blocking device to modulate the radiation signal. This combination eliminates the need for separate alignment sensor systems and their associated maintenance requirements, reducing time loss while maintaining detection reliability.
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 approach allows for precise detection of deflections, enabling effective diagnostics and maintenance of scanning apparatuses, improving measurement accuracy and extending the operational life of existing systems by providing a cost-effective and non-invasive solution.
Implementation Method 1
one module 130 including a source is mounted on a carriage 330 movable on one beam 114 and the other module 140 including a detector is mounted on another carriage 340 movable on the other beam 112. During production, the sheet material 80 or continuously produced sheet material 80 hence travels between two sensor modules 130, 140 which are carried by the top and bottom carriages 330, 340, respectively. Usually a constant source signal is transmitted from the source module 130 through the moving sheet material 80 and is detected by the detection module 140.
Implementation Method 2
attaching a removable blocking device to the detection module, so that a radiation-blocking area of the blocking device partially blocks, in an asymmetrical manner, a sub-area of the cross-sectional area of the radiation impinging onto a detection module aperture of the detection module
Data Source
Figure 1~2A
Figure 2B~3B
Figure 4A~4C
AI summary
A method for detecting a deflection or relative deflection between a source module and a detection module in a scanning apparatus and configured as a sensor pair for scanning transmission measurement of sheet material being transported in a machine direction through a sensing gap formed between the source module and the detection module is provided. The source module is arranged on a first side of the sensing gap and emits a sensing radiation or sensing energy radiation towards the sensing gap, and the detection module is arranged on a second side of the sensing gap opposite to the first side and detects the radiation from the source module and transmitted through the sensing gap. The method includes: attaching a removable blocking device to the detection module, so that a radiation-blocking area of the blocking device partially blocks, in an asymmetrical manner, a sub-area of the cross-sectional area of the radiation impinging onto a detection module aperture of the detection module; and performing a partially-blocked scanning process during which the source module and the detection module are jointly moved in a cross direction of the scanning apparatus, the source module emits the radiation and the detection module detects the radiation from the source module having transmitted through the sensing gap, whereby a selected portion of the radiation corresponding to the sub-area covered by the radiation-blocking area is blocked from being detected by the detection module aperture, whereby a partially-blocked sensor signal is obtained from the radiation detected by the detection module.