Terahertz Wave Measurement for Layered Coating Analysis
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Solution Overview
Problem
Current quality evaluations of layered structures in industrial products, such as coated tablets, are primarily destructive and do not allow for nondestructive assessment of their properties, particularly the coating layers, which limits the ability to analyze their thickness, refractive indices, and the interface characteristics.
Innovation Solution
An electromagnetic wave measurement device utilizing terahertz waves (0.01-100 THz) to nondestructively measure specimens with layered structures by detecting reflected waves and analyzing extreme values of electric fields and time differences, enabling the calculation of layer thicknesses and refractive indices, and assessing the strength and flexibility of the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive testing methods are used to evaluate coating quality, then measurement precision can be improved, but the specimen is damaged and cannot be used again
Solution Approach 1:
The patent replaces mechanical destructive testing methods with electromagnetic wave (terahertz) measurement. The electromagnetic wave penetrates the coating layer and reflects from the interface between the coating and substrate, allowing nondestructive measurement of coating thickness and interface characteristics through reflected wave analysis.
Solution Approach 2:
The patent changes the measurement parameter from physical destruction to electromagnetic wave reflection characteristics. By analyzing the reflectance ratio and time difference of the reflected electromagnetic wave, the system extracts coating thickness and interface strength information without damaging the specimen.
2Reliability
If nondestructive testing is used to preserve specimen integrity, then measurement capability is limited, but with electromagnetic wave measurement, coating thickness and interface characteristics can be measured
Solution Approach 1:
The patent introduces an electromagnetic wave as an intermediary between the measurement system and the coating-substrate interface. The wave penetrates the coating, reflects from the interface, and carries information about both coating thickness and interface characteristics back to the detector, enabling simultaneous nondestructive measurement of multiple parameters.
Solution Approach 2:
The patent adds the dimension of electromagnetic wave frequency (terahertz range) to the measurement process. By using terahertz waves with specific penetration and reflection characteristics, the system can distinguish between coating thickness information and interface characteristics information from the reflected wave signal.
3Adaptability or versatility
If conventional measurement methods are used, then device complexity is low, but adaptability to measure multiple coating properties is limited
Solution Approach 1:
The patent creates a universal measurement system where a single electromagnetic wave measurement装置 can determine multiple coating properties (thickness, refractive index, interface characteristics) by analyzing different parameters of the reflected wave (amplitude, time delay, phase), eliminating the need for multiple specialized measurement devices.
Solution Approach 2:
The patent segments the reflected electromagnetic wave signal into distinct components corresponding to reflections from different interfaces (air-coating, coating-substrate). By analyzing each segment's timing and amplitude separately, the system extracts specific information about coating thickness and interface characteristics independently.
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 nondestructive testing of layered specimens, providing quantitative indices for the strength, detachability, and flexibility of industrial products, such as film-coated tablets, by analyzing reflectance ratios and thickness, thereby optimizing coating processes and product quality.
Implementation Method 1
an electromagnetic wave detector that detects reflected electromagnetic waves which are the electromagnetic waves reflected by the respective at least two layers
Data Source
AI summary
According to the present invention, an electromagnetic wave measurement device includes an electromagnetic wave output device, an electromagnetic wave detector and a measurement unit. The electromagnetic wave output device outputs an electromagnetic wave having a frequency equal to or more than 0.01 [THz] and equal to or less than 100 [THz] toward a device under test including at least two layers, and the electromagnetic wave detector detects reflected electromagnetic waves which are the electromagnetic waves reflected by the respective at least two layers. The measurement unit measures the device under test based on one or both of extreme values of electric fields of the respective reflected electromagnetic waves and a time difference between timings in which the electric fields of the respective reflected electromagnetic waves take the extreme values.