利用單色LED燈開發低成本Moiré偏折技術

A MONOCHROME LED LIGHT SORCE FOR MOIRÉ DEFLECTOMETRY TECHNIQUE

陳建置(Chien-Chih Chen)；丁振卿(Chen-Ching Ting)

Moiré偏折技術 ； 拋物面鏡 ； 平行光 ； 光柵 ； 溫度分布 ； Moiré deflectometry ； parabolic mirror ； parallel light ； grating ； temperature distribution

技術學刊

34卷1期（2019 / 03 / 01）

19 - 24

繁體中文

本論文以發展低成本Moiré偏折技術用以量測在自然對流中測試物之二維溫度分佈。實驗架設使用一個紅色單色光之LED燈當作燈源，其燈源光譜約為625-635 nm。在實驗過程中，單色LED燈經過球透鏡，然而利用球透鏡將LED燈發散光源聚焦成一個點光源，並將此點光源放置在一直徑406 mm及f/4.5之拋物面鏡的焦點上產生一平行光。最後此平行光經過測試區以及兩個由雷射印表機列印頻率皆為254 lpi之光柵。在光柵後方有一台CCD用來抓取變動之條紋，根據Moiré理論得知，變動之條紋的移動量代表著其溫度的高低。本研究成功地量測2維熱流在自然對流下的溫度分布，使用Moiré偏折技術以及熱電偶可以得到最小誤差為5%。

This article develops low cost moiré deflectometry for two-dimensional temperature measurement in free boundary environment. Experimental setup uses a red monochrome LED lamp with a wavelength range of 625-635 nm as light source. In the process, the light first runs through the convex lens and then propagates to the parabolic mirror with diameter of 406 mm and f/4.5 for generating the parallel light. The parallel light further propagates to test object and through two gratings with both pitch 254 lpi, which are printed by laser printer. Behind the two gratings, a CCD camera is applied to capture the image, the distorted fringes. Based on the Moiré deflectometry theory, the two-dimensional temperature distribution in free boundary environment can be determined in terms of the captured fringe shift analysis. This work has successfully measured the two-dimensional temperature distribution in free boundary environment with heat source models of 40-95℃ vertical wall. The measured temperature deviations between Moiré deflectometry and thermocouple thermometer are all less than 5%.

1. Amidror, I.(2009).The Theory of the Moiré Phenomenon.Berlin:Springer.
2. Carlsson, T. E.,Mattsson, R.,Gren, P.,Elfsberg, M.,Tegner, J.(2006).Combination of Schlieren and Pulsed TV Holography in the Study of a High-Speed Flame Jet.Optics and Lasers in Engineering,44(6),535-554.
3. Chen, Y. Y.,Song, Y.,Li, Z. H.,He, A. Z.(2010).A Uniform Description of the Gas and Plasma Flow Fields’ Refractive Index.Optics Communications,283(21),4214-4218.
4. Chen, Y. Y.,Song, Y.,Li, Z. H.,He, A. Z.(2011).A model for Arc Plasma’s Optical Diagonosis by the Meas-urement of the Refractive Index.Optics Communications,284(12),2648-2652.
5. Ezra, B. Z.(1985).Effect of Diffraction on the Moiré Image. Theory.Journal of Optical Society of America A,2(3),371-379.
6. Hecht, E.(2002).Oprtics.New York:Addison-Wesley.
7. Juste, G. L.(2006).Temperature Diagnostics in Downward Flame Spreading Process on Solids.Fire Safety Journal,41(7),558-567.
8. Juste, G. L.,Benavides, E. M.(2011).Temperature Measurement in Small-Scale Flow with Digital Moiré Deflectometry.Experimental Heat Transfer,24,201-214.
9. Juste, G. L.,Contat-Rodrigo, L.(2007).Temperature Field Reconstruction from Phase-Map Obtained with Moiré Deflectometry in Diffusion Flame on Solids.Combustion Science and Technology,179(7),1287-1302.
10. Kafri, O.,Glatt, I.(1990).The physics of Moiré Metrology.New York:Wiley.
11. Keren, E.,Kafri, O.(1985).Diffraction Effects in Moiré Deflectometry.Journal of Optical Society of America A,2(2),111-120.
12. Merzkirch, W.(1987).Flow Visualization.London:Academic Press.
13. Samsonov, V. P.,Samsonova, I. V.(2005).A Moiré Interference Technique for Studying Vortex Flame Structures.Technical Physics Letters,31(2),157-158.
14. Shakher, C.,Nirala, A. K.(1999).A Review on Refractive Index and Temperature Profile Measurements Using Laser-Based Interferometric Techniques.Optics and Laser in Engineering,31(6),455-491.
15. Sharma, D. K.,Stephen, S.,Natarajan, R.(2007).Structure of Burning n-Hexane Droplet by Moiré Deflectometry.Combustion Science and Technology,131,305-321.
16. Wang, B. X.,Luo, X. Z.,Pfeifer, T.,Mischo, H.(1999).Moiré Deflectometry Based on Fourier-Transform Analysis.Measurement,25(4),249-253.
17. Wang, X.,Wu, D.,Pan, G.(2001).Use of Moiré Tomograpgy to Measure the Temperature Field of the Flame of a Pyrotechnical Composition from its Infrared Radiation.Combustion, Explosion, and Shock Waves,37(4),440-442.
18. Yaozu, S.,Xiangchun, Z.,Honglin, Z.(2003).Laser Moiré Deflectometry Applicable for Mini/Micro-Scale Flow Visualization.Proceedings of SPIE-The International Society for Optical Engineering 5058

1. 鄭名山、蔡綽芳、雷明遠、楊明璁、黃俊諭、陳俊貴、胡幃傑、林大惠(2019)。帷幕牆設計與層間縫隙構造的防火時效性能研究。建築學報，108(S技術)，43-58。