A Standard Test Apparatus and Method for Validating the Accuracy of Mobile Phone Apps in Measuring Concrete Crack Widths
This paper presents a standardized apparatus and method for testing the accuracy of mobile phone apps designed to measure concrete crack widths. The apparatus comprises a standardized crack-width calibration plate (CWCP) and a simulated wall (SW), along with a pose adjusting and fixing device (PAFD)...
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| Format: | Article |
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MDPI AG
2025-06-01
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| Series: | Eng |
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| Online Access: | https://www.mdpi.com/2673-4117/6/6/122 |
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| author | Chyuan-Hwan Jeng Min Chao Jian-Hung Chen |
| author_facet | Chyuan-Hwan Jeng Min Chao Jian-Hung Chen |
| author_sort | Chyuan-Hwan Jeng |
| collection | DOAJ |
| description | This paper presents a standardized apparatus and method for testing the accuracy of mobile phone apps designed to measure concrete crack widths. The apparatus comprises a standardized crack-width calibration plate (CWCP) and a simulated wall (SW), along with a pose adjusting and fixing device (PAFD) and a spatial distance measuring assemblage (SDMA). The test method employs an innovative two-stage procedure associated with the SDMA to calculate the distances (K<sub>i</sub>) from the phone’s four corners to the SW. The phone’s position is adjusted using the PAFD until the four monitored K<sub>i</sub> values match the target K<sub>i</sub>. An app installed on the phone then measures crack widths on the CWCP. A standard experimental procedure was established to assess the accuracy of a preliminary Android app in measuring concrete crack widths, with results presented and discussed. This apparatus and method, grounded in their underlying physical meaning, can realistically simulate actual engineering conditions precisely and cost-effectively. |
| format | Article |
| id | doaj-art-e5579e81f9eb43e5a230929fe76bf074 |
| institution | Kabale University |
| issn | 2673-4117 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Eng |
| spelling | doaj-art-e5579e81f9eb43e5a230929fe76bf0742025-08-20T03:27:06ZengMDPI AGEng2673-41172025-06-016612210.3390/eng6060122A Standard Test Apparatus and Method for Validating the Accuracy of Mobile Phone Apps in Measuring Concrete Crack WidthsChyuan-Hwan Jeng0Min Chao1Jian-Hung Chen2Department of Civil Engineering, National Chi Nan University, Nantou 545301, TaiwanDepartment of Civil Engineering and Geomatics, Cheng Shiu University, Kaohsiung 833301, TaiwanDepartment of Information Management, National Chi Nan University, Nantou 545301, TaiwanThis paper presents a standardized apparatus and method for testing the accuracy of mobile phone apps designed to measure concrete crack widths. The apparatus comprises a standardized crack-width calibration plate (CWCP) and a simulated wall (SW), along with a pose adjusting and fixing device (PAFD) and a spatial distance measuring assemblage (SDMA). The test method employs an innovative two-stage procedure associated with the SDMA to calculate the distances (K<sub>i</sub>) from the phone’s four corners to the SW. The phone’s position is adjusted using the PAFD until the four monitored K<sub>i</sub> values match the target K<sub>i</sub>. An app installed on the phone then measures crack widths on the CWCP. A standard experimental procedure was established to assess the accuracy of a preliminary Android app in measuring concrete crack widths, with results presented and discussed. This apparatus and method, grounded in their underlying physical meaning, can realistically simulate actual engineering conditions precisely and cost-effectively.https://www.mdpi.com/2673-4117/6/6/122concrete surface crackcrack widthstandard test methodtest apparatusmobile phoneapp |
| spellingShingle | Chyuan-Hwan Jeng Min Chao Jian-Hung Chen A Standard Test Apparatus and Method for Validating the Accuracy of Mobile Phone Apps in Measuring Concrete Crack Widths Eng concrete surface crack crack width standard test method test apparatus mobile phone app |
| title | A Standard Test Apparatus and Method for Validating the Accuracy of Mobile Phone Apps in Measuring Concrete Crack Widths |
| title_full | A Standard Test Apparatus and Method for Validating the Accuracy of Mobile Phone Apps in Measuring Concrete Crack Widths |
| title_fullStr | A Standard Test Apparatus and Method for Validating the Accuracy of Mobile Phone Apps in Measuring Concrete Crack Widths |
| title_full_unstemmed | A Standard Test Apparatus and Method for Validating the Accuracy of Mobile Phone Apps in Measuring Concrete Crack Widths |
| title_short | A Standard Test Apparatus and Method for Validating the Accuracy of Mobile Phone Apps in Measuring Concrete Crack Widths |
| title_sort | standard test apparatus and method for validating the accuracy of mobile phone apps in measuring concrete crack widths |
| topic | concrete surface crack crack width standard test method test apparatus mobile phone app |
| url | https://www.mdpi.com/2673-4117/6/6/122 |
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