Terahertz Tomographic Inspection for In Situ 3D Printing
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Solution Overview
Problem
Existing nondestructive testing methods for 3D printed polymer composites are inadequate for concurrent inspection during the additive manufacturing process, as they are either destructive, require physical contact, or are impractical for use with 3D printing devices, limiting the scalability and adoption of techniques like ultrasound and X-ray CT.
Innovation Solution
A terahertz-based nondestructive testing apparatus integrated within a 3D printing system that uses terahertz waves for in situ inspection, providing tomographic reconstruction of the material to detect manufacturing defects and flaws in real-time, ensuring safe and non-invasive evaluation of polymer and composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasound inspection is used for nondestructive testing, then measurement precision is improved, but device complexity and ease of operation deteriorate due to requirement of physical contact and viscous coupling media that interfere with 3D printing
Solution Approach 1:
The patent replaces the mechanical ultrasound inspection system with a terahertz electromagnetic radiation system. The terahertz emitter transmits electromagnetic waves through the material without physical contact, eliminating the need for viscous coupling media and mechanical sensors that would interfere with the 3D printing process. This substitution maintains nondestructive testing capability while achieving full compatibility with additive manufacturing operations.
Solution Approach 2:
The patent introduces terahertz electromagnetic radiation as an intermediary between the inspection system and the 3D printed material. This intermediary allows information about the material's internal structure to be obtained without direct physical contact, solving the contradiction between measurement precision and ease of operation during 3D printing.
2Measurement precision
If X-ray computed tomography is used for nondestructive testing, then measurement precision is improved, but device complexity and safety requirements worsen due to ionizing radiation requiring safety enclosures
Solution Approach 1:
The patent changes the fundamental parameter of the inspection radiation from ionizing X-rays to non-ionizing terahertz electromagnetic radiation. This parameter change maintains the ability to penetrate and image the interior of 3D printed parts while eliminating the need for safety enclosures and complex radiation shielding, thereby reducing device complexity and safety requirements.
Solution Approach 2:
The patent substitutes the X-ray imaging system with a terahertz electromagnetic radiation system. This replacement maintains tomographic imaging capability for internal defect detection while removing the need for safety enclosures, thus improving ease of operation and reducing device complexity.
3Ease of operation
If infrared thermography is used for inspection, then ease of operation is improved, but manufacturing precision deteriorates due to post-printing heating affecting geometrical stability
Solution Approach 1:
The patent changes the inspection method from infrared thermography to terahertz electromagnetic radiation. This parameter change enables non-contact inspection (improving ease of operation) while avoiding the thermal heating effect that compromises geometrical stability. The terahertz waves provide sufficient penetration and imaging capability without requiring post-printing heating, thus maintaining manufacturing precision.
4Measurement precision
If conventional nondestructive testing methods are used after fabrication, then measurement precision is improved, but loss of time increases due to post-fabrication inspection requirements
Solution Approach 1:
The patent implements preliminary action by conducting nondestructive testing during the 3D printing fabrication process itself, rather than after completion. The terahertz emitter and receiver are integrated into the printing system to monitor material deposition and detect defects in real-time, providing quality evaluation accuracy while eliminating post-fabrication inspection time.
Solution Approach 2:
The patent enables continuity of useful action by performing inspection operations concurrently with the 3D printing process. The terahertz radiation system operates continuously during material deposition, providing ongoing quality monitoring without interrupting or extending the fabrication timeline, thus eliminating the time loss associated with separate post-fabrication inspection steps.
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 real-time, nondestructive, and non-invasive inspection of 3D printed parts, enhancing manufacturing yield by detecting defects and flaws deep within the material, thus promoting the scalability and adoption of 3D printing in industrial applications.
Implementation Method 1
A terahertz emitter configured and positioned to be directed at a surface
Implementation Method 2
A terahertz receiver configured and positioned to receive reflected terahertz radiation from the surface
Implementation Method 3
receive reflected terahertz radiation from the surface
Implementation Method 4
provide data sufficient for tomographic reconstruction of the material
Data Source
AI summary
A non-destructive testing apparatus includes a terahertz emitter configured and positioned to be directed at a surface that receives material for additive manufacturing. A terahertz receiver is configured and positioned to receive reflected terahertz radiation from the surface. One or more movement mechanisms are configured to create relative movement between the surface and the terahertz receiver to provide data sufficient for tomographic reconstruction of the material for additive manufacturing. The terahertz nondestructive testing apparatus can be within a 3D printing system, and can conduct testing while 3D printing is being conducted.