THz Beam Path Protective Gas Flow for Humidity-Stable Measurement
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Solution Overview
Problem
Existing THz radiation measurement systems are affected by undesired absorption and propagation issues due to environmental factors such as humidity and atmospheric gases, leading to reduced measurement precision.
Innovation Solution
An apparatus is configured to provide a flow of protective gas along the THz radiation beam path, using free jet nozzles and potentially a sheath flow, to control local environmental conditions and minimize absorption, with closed-loop control of gas flow parameters for precise and homogeneous gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurements are performed in ambient air, then the setup is simple and working distance can be large, but measurement precision deteriorates due to humidity and turbulent gas flows causing unwanted absorption and interference
Solution Approach 1:
A flow of protective gas is introduced as an intermediary medium between the THz radiation source and the measurement environment. This protective gas flow shields the THz radiation from ambient air, humidity, and turbulent gas flows, thereby eliminating unwanted absorption and interference while maintaining measurement precision
Solution Approach 2:
The patent creates a localized inert atmosphere by directing a controlled flow of protective gas (such as dry air or nitrogen) along the beam path of the THz radiation. This inert environment prevents harmful interactions between the THz radiation and ambient moisture or turbulent air currents, significantly improving measurement accuracy
2Measurement precision
If housing or guiding devices are used to protect the beam path, then measurement precision improves, but device complexity and structural requirements increase
Solution Approach 1:
Instead of using solid housing or guiding structures, the patent employs a pneumatic approach by directing a controlled flow of protective gas along the beam path. This gas flow dynamically protects the THz radiation without requiring physical enclosures, making the system easier to operate and more flexible in terms of working distance
3Ease of operation
If working distance is increased without protective measures, then ease of operation improves, but measurement precision deteriorates due to environmental factors
Solution Approach 1:
The protective gas flow acts as a mobile shield that extends with the beam path, allowing the system to maintain large working distances while still protecting the THz radiation from environmental factors. The gas flow follows the radiation path, enabling easy operation at various distances without compromising measurement 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
Enhances measurement precision by shielding THz radiation from adverse environmental effects, allowing for larger working distances and flexible handling of measuring objects without additional housing, thus improving the accuracy and applicability of THz measurements.
Implementation Method 1
Terahertz radiation measurements are hindered by environmental factors such as humidity and turbulent gas flows, leading to reduced precision and accuracy due to unwanted absorption and interference
Implementation Method 2
using nozzles to create a laminar or homogeneous gas flow, ensuring minimal attenuation and optimal propagation conditions
Data Source
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AI summary
Apparatus comprising at least one Terahertz, THz, device (110, 110a) configured to transmit and/or receive THz radiation (TR) to and/or from a measuring object 10, said apparatus being configured to provide a flow of protective gas (PG) in at least one portion of a beam path (BP) of said THz radiation (TR).