波長調制共焦干涉術應用於厚度與折射率之量測;Wavelength-modulated confocal interferometry for thickness and refractive index measurements

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Title:	波長調制共焦干涉術應用於厚度與折射率之量測;Wavelength-modulated confocal interferometry for thickness and refractive index measurements
Authors:	王騏宥;Wang, Chi-Yu
Contributors:	光機電工程研究所
Keywords:	共焦顯微術;波長調制干涉術;波長調制共焦干涉術;厚度與折射率量測;confocal microscope;wavelength modulation interferometry;wavelength modulated confocal interferometry;thickness and refractive index measurement
Date:	2019-08-13
Issue Date:	2019-09-03 14:46:49 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文開發一套，可同時量測物體厚度及折射率之量測系統，應用於檢測窗鏡片加工製程、生物醫學檢測及透鏡的厚度與折射率量測等。本論文系統架構為波長調制共焦干涉儀(WMCI)，本系統相較於傳統的共焦顯微鏡系統或是干涉儀系統，之間的差異為傳統的共焦顯微鏡系統及干涉儀，皆需已知物體厚度或折射率其中一個參數，才能量測出另一個參數，而波長調制共焦干涉儀可藉由本系統的核心數學模型，同時求出厚度與折射率。本系統基於共焦顯微鏡及波長調制干涉術之原理，建立一套全新的數學模型，藉由共焦及干涉所量測到的兩個厚度參數，可以解出物體的真實厚度及折射率。以市售雷射窗鏡為待測樣品，作為本系統的量測能力測試，分別量測兩種不同厚度以及三種不同折射率的物體，並與游標卡尺及廠商表訂規格做比較。實驗結果顯示，厚度量測範圍能達到毫米等級，厚度量測解析度為5 μm；折射率量測解析度為0.0045。本系統搭配電控位移平台，以自行開發的系統控制與訊號處理程式，可達到自動化量測，對於精密機械加工、產品製程及生物醫學上有極大的潛力。 ;This study develops a measuring system that can measure the thickness and refractive index of an object simultaneously. It can be applied to inspect the manufacturing process of window lens, biomedical detection, lens thickness and refractive index measurement. The system’s architecture is a wavelength-modulated confocal interference system. The difference is that the conventional confocal microscope system and the interferometer system need to first know either the thickness or refraction of the object in order to obtain the other parameter. And the wavelength-modulated confocal interference system can measure two parameters at the same time by the core mathematical model of this system. Based on the principle of confocal microscope and wavelength modulation interferometry, this system establishes a new mathematical model. The two thickness parameters measured by confocal and interference can solve the true thickness and refractive index of the object. The commercially available laser window mirror is used as the test object to examine the measurement capability of the system, two different thickness and three different refractive index objects are measured separately. And compared with the digital caliper and the manufacturer′s specification, the experimental results show that the thickness measurement range can reach millimeter level. And the thickness measurement’s resolution is 5 μm. The refractive index measurement’s resolution is 0.0045. This system is equipped with an electronically controlled displacement platform. With self-developed control program and signal processing, the system can achieve automated measurement. The system has great potential for precision measurement, product process and biomedicine.
Appears in Collections:	[Graduate Institute of opto-Mechatronics] Electronic Thesis & Dissertation

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