基於PQ:PMMA VBG回饋半導體雷射之 FMCW雷射雷達測距系統研究

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姓名

張若柔(Ruoh-Rou Chang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

基於PQ:PMMA VBG回饋半導體雷射之 FMCW雷射雷達測距系統研究
(Development of the FMCW LiDAR system based on a diode laser feedback with PQ:PMMA VBG)

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摘要(中)

本研究提出使用自製PQ:PMMA VBG作為半導體雷射外部共振腔反射鏡，達成頻率調制連續波(FMCW)雷射雷達系統。首先，將自製感光高分子光學壓克力PQ:PMMA以532 nm綠光雷射進行曝光後，將PQ:PMMA材料製作成反射式體積布拉格光柵(VBG)，回饋1064 nm半導體雷射後，達成單縱模雷射輸出。再將自製PQ:PMMA VBG固定於壓電制動元件(PZT)上，以訊號產生器供給電壓調制PZT產生長度變化，調控半導體雷射外部共振腔的腔長，以此調變此單縱模半導體雷射之輸出波長，達到FMCW雷射發射端架構。本研究之距離量測是以類似麥克森干涉儀的架構，量測兩道反射光相干涉產生的拍頻(Beat Frequency)訊號來計算距離。本研究之FMCW LiDAR系統最適宜量測距離約為五至九公尺，而系統量測之距離標準差約在十公分內。

摘要(英)

An external cavity diode laser(ECDL) feedback with a homemade PQ:PMMA VBG is served as the tunable laser of a FMCW LiDAR system.
Photopolymer material PQ:PMMA is exposed by a 532 nm laser using two-beam interference scheme to achieve a volume Bragg grating(VBG). The VBG is used to feedback a 1064 nm diode laser to reach single longitudinal mode laser output. The VBG is attached to a PZT controlled by a function generator to modulate the length of the external cavity, and thus made a FMCW laser source. The FMCW range finding system is similar to a Michelson interferometer. Two reflected beam will interfere on the sensor plane. The beat frequency is measured and the object distance can be calculated. In this thesis, the optimum measurement distance of our FMCW LiDAR system is approximately 5 m to 9 m, while the standard deviation of the system measurement is within approximately 10 cm.

關鍵字(中)

★ 體積布拉格光柵
★ 外腔半導體雷射
★ 頻率調製連續波
★ 雷射雷達

關鍵字(英)

★ Volume Bragg Grating
★ External Cavity Diode Laser
★ Frequency Modulated Continuous Wave
★ LiDAR

論文目次

摘要 i
Abstract ii
誌謝 iii
目錄 v
圖目錄 viii
第一章緒論 1
1-1 前言 1
1-2 研究動機 4
第二章基本原理 7
2-1 拍頻(Beat frequency) 7
2-2 頻率調制連續波(Frequency-Modulated Continuous Wave, FMCW)雷達原理 9
2-3 體積布拉格光柵(Volume Bragg Grating, VBG) 11
2-4 同調長度(Coherence Length) 13
2-5 雷射外部共振腔(External cavity) 15
2-6 FMCW雷射光源 17
2-7 FMCW測距系統基礎架構 18
第三章 FMCW LiDAR測距系統計算與模擬 20
3-1 FMCW LiDAR測距系統簡介 20
3-2 FMCW LiDAR測距系統計算與模擬 23
3-2-1 電場疊加 23
3-2-2 以電腦軟體模擬實驗訊號 26
3-2-3 FMCW雷射調變頻寬Δf、待測距離D、調變頻率fm與量測拍頻fB之關係 28
3-2-4 實驗參數選擇 32
3-2-5 頻率響應(Frequency Response)對於調變頻寬Δf的影響.......... 33
3-2-6 資料處理(Data processing) 35
第四章 FMCW LiDAR實驗架構與數據分析 37
4-1 FMCW調頻雷射系統 37
4-1-1 調頻雷射之頻率可調變範圍 40
4-1-2 頻率響應的修正 41
4-2 FMCW雷射雷達測距系統 43
4-3 調制頻率fm對不同距離量測 44
4-4 FMCW LiDAR實驗量測結果與分析 45
4-4-1 訊號量測及分析 45
4-4-2 訊雜比(Signal-to-Noise Ratio) 47
4-4-3 理論與實際實驗結果比較 50
第五章結論與未來展望 52
5-1 結論 52
5-2 未來展望 53
第六章參考文獻 55
第七章附錄 59
PQ:PMMA 體積布拉格光柵 59
7-1 雙光束干涉(Two beam interference) 59
7-2 雙光束干涉曝光實驗架構 62
7-3 雙光束干涉曝光實驗樣品量測 64

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指導教授

鍾德元(Te-yuan Chung)

審核日期

2018-5-28

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