Solar-Blind Ultraviolet Four-Quadrant Detector and Spot Positioning System Based on AlGaN Diodes
The four-quadrant detector (4QD), as a highly sensitive and fast-response position-sensitive device, is widely used in laser guidance, target tracking, and related fields. However, traditional visible and infrared 4QDs exhibit significant vulnerability to ambient light interference, particularly und...
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MDPI AG
2025-03-01
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| author | Longfei Peng Shangqing Li Yong Huang Yang Yang |
| author_facet | Longfei Peng Shangqing Li Yong Huang Yang Yang |
| author_sort | Longfei Peng |
| collection | DOAJ |
| description | The four-quadrant detector (4QD), as a highly sensitive and fast-response position-sensitive device, is widely used in laser guidance, target tracking, and related fields. However, traditional visible and infrared 4QDs exhibit significant vulnerability to ambient light interference, particularly under high-intensity background illumination. To address this issue, this paper presents a solar-blind ultraviolet (UV) 4QD and a spot positioning system based on AlGaN diodes, achieving a UV/visible suppression ratio of 2.17 × 10<sup>4</sup> (without solar-blind filters). The system employs a high-linearity, low-noise capacitive transimpedance amplifier (CTIA) as the readout circuit for the high-sensitivity and rapid-response solar-blind UV detectors, enabling the precise conversion of weak photocurrent signals into voltage signals for digitization. Utilizing a third-order polynomial least-squares fitting algorithm without introducing complex filtering techniques, the system achieves a maximum positioning error of 0.0101 mm and a root-mean-square error (RMSE) of 0.0057 mm, among of one the best-performing solar-blind UV 4QDs. The experimental results demonstrate exceptional spot positioning performance under a 275 nm laser source, meeting the high-precision requirements for space target detection. This research provides a reference for the application of solar-blind UV 4QDs in positioning, alignment, and monitoring scenarios, thereby holding significant practical implications. |
| format | Article |
| id | doaj-art-4d6d64fa73d048e68faae23090ae4e81 |
| institution | DOAJ |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-03-01 |
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| spelling | doaj-art-4d6d64fa73d048e68faae23090ae4e812025-08-20T03:08:59ZengMDPI AGSensors1424-82202025-03-01257220610.3390/s25072206Solar-Blind Ultraviolet Four-Quadrant Detector and Spot Positioning System Based on AlGaN DiodesLongfei Peng0Shangqing Li1Yong Huang2Yang Yang3State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310007, ChinaState Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310007, ChinaXidian-Wuhu Research Institute, Bldg. 7, Science and Technology Industrial Park, No. 717, Zhongshan (S) Rd., Yijiang District, Wuhu 241000, ChinaState Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310007, ChinaThe four-quadrant detector (4QD), as a highly sensitive and fast-response position-sensitive device, is widely used in laser guidance, target tracking, and related fields. However, traditional visible and infrared 4QDs exhibit significant vulnerability to ambient light interference, particularly under high-intensity background illumination. To address this issue, this paper presents a solar-blind ultraviolet (UV) 4QD and a spot positioning system based on AlGaN diodes, achieving a UV/visible suppression ratio of 2.17 × 10<sup>4</sup> (without solar-blind filters). The system employs a high-linearity, low-noise capacitive transimpedance amplifier (CTIA) as the readout circuit for the high-sensitivity and rapid-response solar-blind UV detectors, enabling the precise conversion of weak photocurrent signals into voltage signals for digitization. Utilizing a third-order polynomial least-squares fitting algorithm without introducing complex filtering techniques, the system achieves a maximum positioning error of 0.0101 mm and a root-mean-square error (RMSE) of 0.0057 mm, among of one the best-performing solar-blind UV 4QDs. The experimental results demonstrate exceptional spot positioning performance under a 275 nm laser source, meeting the high-precision requirements for space target detection. This research provides a reference for the application of solar-blind UV 4QDs in positioning, alignment, and monitoring scenarios, thereby holding significant practical implications.https://www.mdpi.com/1424-8220/25/7/2206four-quadrant detectorsolar-blind ultravioletAlGaNspot positioningphotoelectric signal processing |
| spellingShingle | Longfei Peng Shangqing Li Yong Huang Yang Yang Solar-Blind Ultraviolet Four-Quadrant Detector and Spot Positioning System Based on AlGaN Diodes Sensors four-quadrant detector solar-blind ultraviolet AlGaN spot positioning photoelectric signal processing |
| title | Solar-Blind Ultraviolet Four-Quadrant Detector and Spot Positioning System Based on AlGaN Diodes |
| title_full | Solar-Blind Ultraviolet Four-Quadrant Detector and Spot Positioning System Based on AlGaN Diodes |
| title_fullStr | Solar-Blind Ultraviolet Four-Quadrant Detector and Spot Positioning System Based on AlGaN Diodes |
| title_full_unstemmed | Solar-Blind Ultraviolet Four-Quadrant Detector and Spot Positioning System Based on AlGaN Diodes |
| title_short | Solar-Blind Ultraviolet Four-Quadrant Detector and Spot Positioning System Based on AlGaN Diodes |
| title_sort | solar blind ultraviolet four quadrant detector and spot positioning system based on algan diodes |
| topic | four-quadrant detector solar-blind ultraviolet AlGaN spot positioning photoelectric signal processing |
| url | https://www.mdpi.com/1424-8220/25/7/2206 |
| work_keys_str_mv | AT longfeipeng solarblindultravioletfourquadrantdetectorandspotpositioningsystembasedonalgandiodes AT shangqingli solarblindultravioletfourquadrantdetectorandspotpositioningsystembasedonalgandiodes AT yonghuang solarblindultravioletfourquadrantdetectorandspotpositioningsystembasedonalgandiodes AT yangyang solarblindultravioletfourquadrantdetectorandspotpositioningsystembasedonalgandiodes |