UVC-LED光學模型及其應用於採後水果保鮮的研究

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黎秋玉(Le Thi Thu Ngoc) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

UVC-LED光學模型及其應用於採後水果保鮮的研究
(Study of an optical model of UVC-LEDs and its application in postharvest fruit preservation)

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至系統瀏覽論文 (2027-12-30以後開放)

摘要(中)

本論文展示了 UVC LED 技術在延長採後水果保質期方面的一些進展。首先，我們開發了一種新型的 UVC LED 光學模型，利用螢光膜捕捉二維輻照度分佈模式，在 5 毫米時達到 99.8% 的歸一化互相關（NCC）值，在 8 毫米和 10 毫米時達到 99.9% 的值，達到高精度的效果。其次，我們設計了一個尺寸為30 × 30 × 30公分的UVC LED 腔體，以減少香蕉上的黑斑，並仔細監測輻照度分佈（6-9 W/m2）。最佳 UVC 劑量估計在 0.030 × 103 到 0.045 × 103 W?s/m2之間，能有效防止黑斑，且不會明顯損害香蕉皮。第三，我們製作了一個由4 × 4 LED矩陣排列組成的UVC LED 陣列系統，以控制茂谷橘子的綠黴，達到高輻照度均勻性，並在 0.9 × 103 到 4.5 × 103 W?s/m2 的最佳劑量下維持茂谷的品質長達四週。最後，我們調查了 UVC 處理對芒果的有效性。結果顯示，UVC 處理能有效延長初始感染症狀較少的芒果的保質期，但對於那些在處理前已存在病症的芒果則無效。根據結果，我們研究了 UVC 光穿透芒果黑斑的情況，並開發了芒果黑斑的光學模型，以準確預測光在這些斑點中的透射。研究結果表明，UVC 光穿透芒果黑斑的能力不足以滅活已經侵入芒果的真菌。我們建議，選擇外觀良好且初始可見感染症狀最少的芒果，對於實現有效的 UVC 處理至關重要。總體而言，這項研究提出了有效的 UVC LED 系統，並為優化 UVC LED 處理提供了重要指南，以提高採後水果的品質和保質期，旨在提升水果產業的經濟效率。

摘要(英)

This study presents several advancements in UVC LED technology for prolonging the shelf life of postharvest fruits. First, we developed a novel optical model for UVC LEDs using fluorescent film to capture 2-D irradiance patterns, achieving high precision with normalized cross-correlation (NCC) values of 99.8% at 5 mm and 99.9% at 8 mm and 10 mm distances. Second, a UVC LED cavity with dimensions of 30 × 30 × 30 cm was designed to reduce black spots on bananas, with careful monitoring of irradiance distribution (6-9 W/m2). The optimal UVC doses, estimated between 0.030 × 103 and 0.045 × 103 W?s/m2, effectively prevent black spots without visible harming the peel. Third, we fabricated a UVC LED array system with a 4 × 4 LED matrix arrangement to control green mold in murcotts, achieving high irradiance uniformity and maintaining murcott quality for up to four weeks at an appropriate dose ranging between 0.9 × 103 to 4.5 × 103 W?s/m2. Finally, we investigate the effectiveness of UVC treatment for mangoes. The results demonstrated that UVC treatment effectively prolong the shelf life for mangoes with minimal initial infection symptoms but is ineffective for those with exhibiting disease symptoms pre-treatment. According to the results, we investigated the UVC light penetration through mango black spots and developed optical model for mango black spot to effectively estimate light transmittance through them. Our finding indicated that UVC light penetration through mango black spots is insufficient to inhibit fungi that has already invaded the mango. We suggest that selecting mangoes with a healthy appearance and minimal infection symptoms is essential for obtaining effective UVC treatment. Overall, this research proposed effective UVC LED systems and provides essential guidelines for optimizing UVC LED treatments to enhance the quality and shelf life of postharvest fruits, with the aim of improving the economic efficiency of fruit industry.

關鍵字(中)

★ One keyword per line
★ 光學模型
★ UVC處理
★ UVC LED 系統
★ 水果保鮮
★ UVC技術

關鍵字(英)

★ One keyword per line
★ Optical model
★ UVC treatment
★ UVC LED system
★ Fruit preservation
★ UVC technology

論文目次

摘要 I
Abstract II
Acknowledgment III
Table of Contents IV
List of Figures VII
List of Tables XV
Explanation of Abbreviations XVI
Chapter 1 Introduction 1
1.1 Introduction to Ultraviolet C light 1
1.2 Brief history of UV LEDs Development 2
1.3 Motivation and dissertation overview 5
Chapter 2 UVC LED Technology in Postharvest Preservation
9
2.1 Mechanism of UVC treatment for postharvest
fruit preservation 9
2.1.1 Microorganism inactivation mechanisms
9
2.1.2 Effect of UVC radiation on fruit
properties 12
2.2 UVC LED devices 12
2.2.1 LED chip 12
2.2.2 LED chip fabrication 14
2.3 UVC dose 15
2.4 UVC safety considerations 15
Chapter 3 Optical Modeling for UVC LED using Fluorescent
Film 17
3.1 Introduction 17
3.2 Methods 20
3.2.1 Materials and analysis 20
3.2.2 Assessing the proportionality of
irradiance and radiance on fluorescent film
22
3.2.3 Gray level calibration equation 23
3.3 Results 25
3.4 Application of light source model for dome lens
design 27
Chapter 4 UVC LED Cavity with Precisely Monitored
Irradiation for Extending the Shelf Life of
Bananas 29
4.1 Design and fabricating a UVC LED cavity 29
4.1.1 Design and fabrication of the UVC cavity
29
4.1.2 Monitoring the irradiance distribution
inside the cavity 31
4.2 Effect of UVC treatment on bananas 34
4.2.1 Sampling and analysis 34
4.2.2 Results 35
4.3 UVC treatment under in vitro conditions 37
4.3.1 Effect of UVC treatment on mycelial
growth of C. musae 38
4.3.2 Effect of UVC treatment on conidial
germination of C. musae 39
4.4 Summaries 40
Chapter 5 UVC LED Array for Extending the Shelf Life of
murcotts 42
5.1 Optical system 42
5.2 Irradiance monitoring 46
5.2.1 Irradiance distribution 46
5.2.2 Irradiance distribution in advanced
application 47
5.3 UVC treatment under in vitro conditions 49
5.3.1 Methodology 49
5.3.2 Results 49
5.4 UVC effect in reducing green mold on murcotts
50
5.4.1 Sampling and assessment methods 50
5.4.2 Results and discussion 51
5.5 Summaries 57
Chapter 6 Is UVC Radiation Effective in Extending the
Mango Shelf Life? Optical Model of Mango Black
Spot 59
6.1 Optical system and irradiance distribution 60
6.1.1 UVC LED cavity 60
6.1.2 Irradiance distribution 60
6.2 UVC treatment for mangoes 62
6.2.1 Disease assessment 62
6.2.2 Materials and sampling 62
6.2.3 Effects of UVC treatment on reducing
diseases in mangoes 63
6.3 UVC treatment under in vitro conditions 67
6.3.1 Sampling and statistical analysis 67
6.3.2 UVC treatment effects on the fungal
development 68
6.4 Optical model of mango disease 68
6.4.1 UVC light transmittance measurement
through mango black spots 69
6.4.2 Optical model of mango black spot 70
6.5 Summaries 74
Chapter 7 Conclusions and Future Outlooks 76
7.1 Conclusions 76
7.2 Future outlooks 78
References 79

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指導教授

孫慶成(Ching-Cherng Sun)

審核日期

2024-12-31

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