THz Measuring Device Calibration for Extruded Profile Geometry
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Solution Overview
Problem
Existing THz measuring devices in extrusion lines face challenges in accurately determining geometric properties and refractive index of extruded profiles due to errors and deviations, particularly when measuring profiles with unknown refractive indices.
Innovation Solution
A method and system utilizing a stationary THz measuring device combined with a reference gauge and portable THz and mechanical measuring devices to perform inline and offline measurements, enabling calibration and correction of measurement errors by comparing geometric measurements at the same point on cooled profile pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a stationary THz measuring device is used for inline measurement of extruded profiles, then continuous measurement during production is enabled, but measurement accuracy deteriorates due to unknown refractive index and device errors
Solution Approach 1:
The patent applies preliminary action by performing offline calibration measurements on cooled profile pieces using portable reference measuring devices before using the stationary THz measuring device for continuous inline measurement. This preliminary calibration establishes reference values that compensate for the unknown refractive index and device errors, enabling accurate continuous measurement during production without compromising measurement precision.
2Ease of operation
If a stationary THz measuring device is used for inline measurement, then direct continuous measurement is achieved, but measurement reliability deteriorates due to device errors and defects
Solution Approach 1:
The patent implements feedback by using portable reference measuring devices to periodically measure cooled profile pieces and comparing these measurements with the stationary THz measuring device readings. The deviations detected through this feedback loop are used to calibrate and correct the stationary device, ensuring measurement reliability while maintaining the ease of direct inline measurement operation.
3Measurement precision
If portable measuring devices are used for offline measurement of cooled profile pieces, then measurement accuracy can be improved through calibration, but production time increases due to additional measurement steps
Solution Approach 1:
The patent applies this principle by using portable measuring devices that can be quickly applied to individual cooled profile pieces for calibration purposes. These portable devices serve as temporary, disposable calibration tools that are used only when needed for calibration, then removed to allow the main stationary device to continue continuous measurement without interruption, thus minimizing time loss while maintaining precision.
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
Ensures reliable and accurate determination of geometric properties and refractive index of extruded profiles, allowing for real-time correction of measurement deviations and ensuring high safety and accuracy without production delays.
Implementation Method 1
terahertz radiation, which can also be in the radar and microwave range, is emitted by a THz transmitter and partially reflected at the boundary surfaces of the profile
Implementation Method 2
geometric properties can be determined directly or indirectly from transit times of the reflected signal
Implementation Method 3
The ultrasonic measuring device is preferably applied to the profile piece from the outside, i.e. in particular perpendicularly to the outer surface of the profile piece
Implementation Method 4
the reference gauge has a measuring accuracy down to the micrometer range. In particular, a mechanical measuring device, ultrasonic measuring device and/or laser measuring device can be provided as a reference measuring device
Data Source
AI summary
The present disclosure relates to a method for calibrating a stationary THz measuring device which measures geometric properties of a profile by means of one or more THz sensors during an extrusion of the profile, comprising at least one or more steps.