THz-TDS Techniques of Thickness Measurements in Thin Shim Stock Films and Composite Materials
Terahertz wave (T-ray) scanning applications are one of the most promising tools for nondestructive evaluation. T-ray scanning applications use a T-ray technique to measure the thickness of both thin Shim stock films and GFRP (glass fiber-reinforced plastics) composites, of which the samples were se...
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MDPI AG
2021-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/19/8889 |
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| author | Kwang-Hee Im Sun-Kyu Kim Young-Tae Cho Yong-Deuck Woo Chien-Ping Chiou |
| author_facet | Kwang-Hee Im Sun-Kyu Kim Young-Tae Cho Yong-Deuck Woo Chien-Ping Chiou |
| author_sort | Kwang-Hee Im |
| collection | DOAJ |
| description | Terahertz wave (T-ray) scanning applications are one of the most promising tools for nondestructive evaluation. T-ray scanning applications use a T-ray technique to measure the thickness of both thin Shim stock films and GFRP (glass fiber-reinforced plastics) composites, of which the samples were selected because the T-ray method could penetrate the non-conducting samples. Notably, this method is nondestructive, making it useful for analyzing the characteristics of the materials. Thus, the T-ray thickness measurement can be found for both non-conducting Shim stock films and GFRP composites. In this work, a characterization procedure was conducted to analyze electromagnetic properties, such as the refractive index. The obtained estimates of the properties are in good agreement with the known data for poly methyl methacrylate (PMMA) for acquiring the refractive index. The T-ray technique was developed to measure the thickness of the thin Shim stock films and the GFRP composites. Our tests obtained good results on the thickness of the standard film samples, with the different thicknesses ranging from around 120 μm to 500 μm. In this study, the T-ray method was based on the reflection mode measurement, and the time-of-flight (TOF) and resonance frequencies were utilized to acquire the thickness measurements of the films and GFRP composites. The results showed that the thickness of the samples of frequency matched those obtained directly by time-of-flight (TOF) methods. |
| first_indexed | 2024-03-10T07:06:30Z |
| format | Article |
| id | doaj.art-3620d0ea0bd542da879486c8abae2afe |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T07:06:30Z |
| publishDate | 2021-09-01 |
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| spelling | doaj.art-3620d0ea0bd542da879486c8abae2afe2023-11-22T15:44:29ZengMDPI AGApplied Sciences2076-34172021-09-011119888910.3390/app11198889THz-TDS Techniques of Thickness Measurements in Thin Shim Stock Films and Composite MaterialsKwang-Hee Im0Sun-Kyu Kim1Young-Tae Cho2Yong-Deuck Woo3Chien-Ping Chiou4Department of Automotive Engineering, Woosuk University, Wanju-kun, Jeonbuk 55338, KoreaDivision of Mechanical System Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, KoreaDepartment of Basic Science, Jeonju University, Jeonju, Jeonbuk 55069, KoreaDepartment of Automotive Engineering, Woosuk University, Wanju-kun, Jeonbuk 55338, KoreaAerospace Engineering and Center for Nondestructive Evaluation, Iowa State University, Ames, IA 50011, USATerahertz wave (T-ray) scanning applications are one of the most promising tools for nondestructive evaluation. T-ray scanning applications use a T-ray technique to measure the thickness of both thin Shim stock films and GFRP (glass fiber-reinforced plastics) composites, of which the samples were selected because the T-ray method could penetrate the non-conducting samples. Notably, this method is nondestructive, making it useful for analyzing the characteristics of the materials. Thus, the T-ray thickness measurement can be found for both non-conducting Shim stock films and GFRP composites. In this work, a characterization procedure was conducted to analyze electromagnetic properties, such as the refractive index. The obtained estimates of the properties are in good agreement with the known data for poly methyl methacrylate (PMMA) for acquiring the refractive index. The T-ray technique was developed to measure the thickness of the thin Shim stock films and the GFRP composites. Our tests obtained good results on the thickness of the standard film samples, with the different thicknesses ranging from around 120 μm to 500 μm. In this study, the T-ray method was based on the reflection mode measurement, and the time-of-flight (TOF) and resonance frequencies were utilized to acquire the thickness measurements of the films and GFRP composites. The results showed that the thickness of the samples of frequency matched those obtained directly by time-of-flight (TOF) methods.https://www.mdpi.com/2076-3417/11/19/8889terahertz wavesrefractive indexthickness measurementShim stock filmscomposite materialsreflection mode |
| spellingShingle | Kwang-Hee Im Sun-Kyu Kim Young-Tae Cho Yong-Deuck Woo Chien-Ping Chiou THz-TDS Techniques of Thickness Measurements in Thin Shim Stock Films and Composite Materials Applied Sciences terahertz waves refractive index thickness measurement Shim stock films composite materials reflection mode |
| title | THz-TDS Techniques of Thickness Measurements in Thin Shim Stock Films and Composite Materials |
| title_full | THz-TDS Techniques of Thickness Measurements in Thin Shim Stock Films and Composite Materials |
| title_fullStr | THz-TDS Techniques of Thickness Measurements in Thin Shim Stock Films and Composite Materials |
| title_full_unstemmed | THz-TDS Techniques of Thickness Measurements in Thin Shim Stock Films and Composite Materials |
| title_short | THz-TDS Techniques of Thickness Measurements in Thin Shim Stock Films and Composite Materials |
| title_sort | thz tds techniques of thickness measurements in thin shim stock films and composite materials |
| topic | terahertz waves refractive index thickness measurement Shim stock films composite materials reflection mode |
| url | https://www.mdpi.com/2076-3417/11/19/8889 |
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