Enhanced Digital Gradient Sensing Using Backlight Digital Speckle Target
Digital gradient sensing (DGS) is a non-contact and full-field optical measurement technique, which assesses mechanical behaviors of transparent materials or specular structures by measuring angular deflections of light rays. However, owing to the poor light-gathering capability of its imaging syste...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-11-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/20/22/6557 |
| _version_ | 1797547712308051968 |
|---|---|
| author | Baofei Fu Chenzhuo Li Bo Dong Pan Ou |
| author_facet | Baofei Fu Chenzhuo Li Bo Dong Pan Ou |
| author_sort | Baofei Fu |
| collection | DOAJ |
| description | Digital gradient sensing (DGS) is a non-contact and full-field optical measurement technique, which assesses mechanical behaviors of transparent materials or specular structures by measuring angular deflections of light rays. However, owing to the poor light-gathering capability of its imaging system, the dynamic performance of DGS is heavily restricted. Here, a method of enhancing the dynamic performance of DGS by improving its speckle target is proposed. The method employs the technique of backlight illumination, which significantly increases the utilization efficiency of light, shortens the exposure time, and enhances the dynamic performance of DGS. Additionally, it also uses the optimized digital speckle pattern to improve the measurement precision and accuracy. For validation, a comparison experiment was conducted, proving that the proposed method can improve the utilization efficiency of light by about 80 times and improve the quality of the speckle images by about 40%. Real tests, including a uniaxial tension test using transmission-mode DGS (t-DGS) and a three-point bending test using reflection-mode DGS (r-DGS), were also carried out, showing the efficacy and high compatibility of the proposed backlight digital speckle target. In summary, this simple method greatly improves the performance of DGS, which can be used as a standard method in both t-DGS and r-DGS. |
| first_indexed | 2024-03-10T14:48:01Z |
| format | Article |
| id | doaj.art-af31b263916645409a9f1879376e6b04 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T14:48:01Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-af31b263916645409a9f1879376e6b042023-11-20T21:13:10ZengMDPI AGSensors1424-82202020-11-012022655710.3390/s20226557Enhanced Digital Gradient Sensing Using Backlight Digital Speckle TargetBaofei Fu0Chenzhuo Li1Bo Dong2Pan Ou3School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, ChinaInstitute of Solid Mechanics, Beihang University, Beijing 100191, ChinaSchool of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, ChinaSchool of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, ChinaDigital gradient sensing (DGS) is a non-contact and full-field optical measurement technique, which assesses mechanical behaviors of transparent materials or specular structures by measuring angular deflections of light rays. However, owing to the poor light-gathering capability of its imaging system, the dynamic performance of DGS is heavily restricted. Here, a method of enhancing the dynamic performance of DGS by improving its speckle target is proposed. The method employs the technique of backlight illumination, which significantly increases the utilization efficiency of light, shortens the exposure time, and enhances the dynamic performance of DGS. Additionally, it also uses the optimized digital speckle pattern to improve the measurement precision and accuracy. For validation, a comparison experiment was conducted, proving that the proposed method can improve the utilization efficiency of light by about 80 times and improve the quality of the speckle images by about 40%. Real tests, including a uniaxial tension test using transmission-mode DGS (t-DGS) and a three-point bending test using reflection-mode DGS (r-DGS), were also carried out, showing the efficacy and high compatibility of the proposed backlight digital speckle target. In summary, this simple method greatly improves the performance of DGS, which can be used as a standard method in both t-DGS and r-DGS.https://www.mdpi.com/1424-8220/20/22/6557digital gradient sensingbacklight illuminationangular deflectionstress gradient |
| spellingShingle | Baofei Fu Chenzhuo Li Bo Dong Pan Ou Enhanced Digital Gradient Sensing Using Backlight Digital Speckle Target Sensors digital gradient sensing backlight illumination angular deflection stress gradient |
| title | Enhanced Digital Gradient Sensing Using Backlight Digital Speckle Target |
| title_full | Enhanced Digital Gradient Sensing Using Backlight Digital Speckle Target |
| title_fullStr | Enhanced Digital Gradient Sensing Using Backlight Digital Speckle Target |
| title_full_unstemmed | Enhanced Digital Gradient Sensing Using Backlight Digital Speckle Target |
| title_short | Enhanced Digital Gradient Sensing Using Backlight Digital Speckle Target |
| title_sort | enhanced digital gradient sensing using backlight digital speckle target |
| topic | digital gradient sensing backlight illumination angular deflection stress gradient |
| url | https://www.mdpi.com/1424-8220/20/22/6557 |
| work_keys_str_mv | AT baofeifu enhanceddigitalgradientsensingusingbacklightdigitalspeckletarget AT chenzhuoli enhanceddigitalgradientsensingusingbacklightdigitalspeckletarget AT bodong enhanceddigitalgradientsensingusingbacklightdigitalspeckletarget AT panou enhanceddigitalgradientsensingusingbacklightdigitalspeckletarget |