THz Measuring Device Adaptive Bandwidth Control
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Solution Overview
Problem
Current THz measuring devices require complex and expensive equipment for high-resolution layer thickness measurements, often interfering with other frequency-based processes and limiting their use without external shielding.
Innovation Solution
A method and device that utilize a pre-measurement phase with a narrow bandwidth for object detection and a main measurement phase with a wider bandwidth for precise layer thickness determination, allowing for high-resolution measurements without external shielding by adjusting the frequency range and increasing the output, enabling portable and user-friendly operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wide bandwidth THz radiation is used for high resolution measurements, then measurement precision is improved, but interference with other frequency-based processes increases and device complexity increases
Solution Approach 1:
The system performs a pre-measurement phase before the actual measurement to determine the distance to the measurement object. Based on this distance information, the system adaptively adjusts the bandwidth of the THz radiation. This preliminary action allows the system to use wide bandwidth only when necessary (when the object is within a critical distance range), thereby improving measurement precision when needed while reducing interference and complexity when the object is farther away.
2Measurement precision
If wide bandwidth THz radiation is used for high resolution measurements, then measurement precision is improved, but interference with other frequency-based processes increases
Solution Approach 1:
The system dynamically adjusts the bandwidth of the THz radiation based on the measured distance to the object. When the object is within a critical distance range where high precision measurement is needed, the system switches to wide bandwidth mode. When the object is farther away, the system uses narrow bandwidth mode to minimize interference with other frequency-based processes. This dynamic adaptation resolves the contradiction between measurement precision and interference generation.
3Measurement precision
If optical measuring devices with short period lasers are used for broad band measurements, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts and utilizes the natural distance-dependent reflection characteristics of the measurement object itself as a passive indicator. By measuring the distance to the object and using this information to control the bandwidth, the system eliminates the need for complex optical laser equipment. The object's own physical properties (distance and reflectivity) are used to trigger the appropriate measurement mode, replacing complex active optical systems with simpler electronic control.
4Measurement precision
If THz measuring device is positioned close to measurement object for high resolution, then measurement precision is improved, but ease of operation decreases
Solution Approach 1:
The system continuously monitors the distance to the measurement object and provides feedback to the user through visual indicators (e.g., color-coded displays showing green, yellow, red zones). This feedback mechanism guides the user to position the device at the optimal distance for high-resolution measurement without requiring the user to manually calculate or estimate the correct positioning. The system automatically adjusts its operation based on the measured distance, making precise measurement easier to achieve.
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
Enables secure, high-resolution, and precise layer thickness measurements of cylindrical objects with minimal effort, allowing for wider bandwidth usage without interference, even in unshielded environments, while maintaining precision and reducing operational complexity.
Implementation Method 1
THz radiation reflected off the boundary surfaces because the material of the measurement objects, such as e.g. plastics, exhibits a higher refraction index compared to the surrounding air
Implementation Method 2
using the emitted second THz transmission beam and the detected reflected THz radiation, a measurement of geometric characteristics or material characteristics of the measurement object is carried out
Data Source
AI summary
The invention relates to a method for THz measuring a measurement object (3), including at least the following steps:phase or a pre-measurement, in which e.g. a first THz transmission beam (112) of a THz transceiver of a THz measuring device (2) is emitted at a first frequency range and having a first bandwidth along an optical axis towards the measurement object (3) and THz radiation reflected from a boundary surface of the measurement object (3) is detected,determining, whether a measurement object (3) has been detected,if the measurement object (3) has been detected, determining a current distance of the THz measuring devices (2) or the THz transceiver from the boundary surface (St5),comparing the determined des current distance with a distance limit, andwhen the distance limit has not been exceeded, subsequent initiation of a main measurement or indication of an initiation of the main measurement,phase of the main measurement, in which a main measurement THZ transmission beam is emitted along the optical axis towards the measurement object and reflected THz radiation is detected, whereby, preferably, a second bandwidth of the main measurement THZ transmission beam is wider than the first bandwidth, whereby measured characteristics, e.g. a layer thickness or material composition, are determined from the emitted main measurement THZ transmission beam and the detected reflected THz radiation,putting out the measurement result.