Adjustable Cylindrical Plasma Resonant Cavity for PCVD
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Solution Overview
Problem
Conventional plasma resonant cavities used in PCVD for optical fiber manufacturing have fixed structures, limiting their ability to match with lining pipes of different sizes, leading to energy loss and reduced processing precision.
Innovation Solution
A cylindrical plasma resonant cavity with removable end cover structures and adjustable cutoff waveguides, allowing for matching with glass lining pipes of varying diameters, enhanced coupling efficiency, and integrated cooling water channels for thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed structure resonant cavity is used, then the cavity structure is simple and easy to manufacture, but the processing range is greatly limited and cannot meet the requirements of deposition for lining pipes with different sizes
Solution Approach 1:
The resonant cavity is divided into a fixed cavity body and adjustable cutoff waveguides that can be independently modified. The cutoff waveguides are segmented into removable parts including end covers and intermediate sections, allowing the inner diameter and length to be adjusted without changing the main cavity structure. This segmentation enables the cavity to adapt to different lining pipe sizes while maintaining structural simplicity.
Solution Approach 2:
The cutoff waveguides are designed with dynamic adjustability through removable end covers and interchangeable intermediate sections. This allows the dimensions of the cutoff waveguides to be changed according to different processing requirements, transforming a static fixed-structure cavity into a dynamically adaptable system that can handle various lining pipe diameters and lengths.
2Loss of energy
If the resonant cavity is mismatched with the load, then the structure remains fixed and simple, but energy loss increases and coupling effect deteriorates
Solution Approach 1:
The inner diameter and length of the cutoff waveguides are changed by adjusting the diameter of intermediate through holes and the axial thickness of removable end covers. These parameter changes enable the resonant cavity to match loads with different sizes, optimizing the coupling effect and reducing energy loss while maintaining good matching performance across different processing conditions.
3Adaptability or versatility
If the cutoff waveguide dimensions are fixed, then the manufacturing is simple, but the resonant cavity cannot be matched with glass lining pipes of different diameters
Solution Approach 1:
The cutoff waveguide is segmented into a fixed main body and removable adjustable sections. The removable end covers and interchangeable intermediate sections allow dimension adjustment while keeping the base structure simple and easy to manufacture. This segmentation enables standardized mass production of base components with modular adjustable parts.
Solution Approach 2:
The cutoff waveguide transitions from a fixed static structure to a dynamically adjustable one through removable end covers and interchangeable sections. This allows the same base structure to be manufactured once and then adapted to different dimensions by swapping components, maintaining manufacturing simplicity while achieving versatility.
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
The solution extends the processing range, improves deposition uniformity, reduces energy loss, and enhances operational reliability, while maintaining simplicity and ease of manufacturing, thereby improving the overall efficiency and precision of the PCVD process.
Implementation Method 1
Microwaves generated by the microwave generator are coupled to the plasma resonant cavity through the waveguide device, and the high-frequency microwave energy is transmitted to an area for processing an optical fiber preform through the plasma resonant cavity
Implementation Method 2
The match between the plasma resonant cavity and microwave is very important in the process. The mismatching between the two not only affects the coupling effect and causes energy loss, but also easily damages the system device
Implementation Method 3
a cooling water channel is arranged in each cutoff waveguide with the removable end surface structure, and two ends of the cooling water channel are communicated with a cooling water pipeline
Implementation Method 4
the cooling water channel is arranged in the removable end cover structure of each cutoff waveguide, thus the structure is simple, and the cooling requirements of the resonant cavity in the high temperature environment can be fully met
Data Source
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AI summary
The present invention relates to a cylindrical plasma resonant cavity for the PCVD (Plasma Chemical Vapor Deposition) optical fiber preform processing machine. The cylindrical plasma resonant cavity includes a cylindrical resonant cavity case. Cutoff waveguides are set at the both sides of the cylindrical resonant cavity case, and a waveguide inlet is opened in the circumferential direction of the cylindrical resonant cavity case. The cylindrical plasma resonant cavity is characterized in that: the cutoff waveguides at the both sides of the cylindrical resonant cavity case are movable end cover structure, middle vias are opened in said movable end cover structural cutoff waveguides, and bumped truncated cones configured with the cylindrical resonant cavity are set at the inside end surfaces. The present invention enables the matching between the resonant cavity and the glass tubes with different diameters through the disassembly and change of the cutoff waveguides, and enables a better matching between the waveguide devices and the resonant cavity load. The coupling effect is improved to adapt the variation of the load in the machining process, and the energy loss is decreased, thus the adaptation range of the machining of the cylindrical plasma resonant cavity is improved. With the simple structure, easy machining and manufacturing, uniform deposition, good deposition attachment effect, the present invention improves the machining precision and efficiency of the PCVD process.