光譜可調(diào)的自由曲面LED無影燈及其視覺感知的研究
發(fā)布時間：2019-03-18 18:22
【摘要】：隨著LED技術(shù)的成熟和醫(yī)療照明需求的日益復(fù)雜化,有關(guān)LED在手術(shù)無影燈中應(yīng)用的研究越來越多,并開始出現(xiàn)商業(yè)化的LED無影燈產(chǎn)品。跟傳統(tǒng)的鹵素?zé)o影燈系統(tǒng)相比較,雖然LED手術(shù)無影燈具有明顯的優(yōu)勢,但是其設(shè)計理論還沒有形成成熟的體系。 本文從無影燈的發(fā)展歷程出發(fā),對比了目前LED無影燈產(chǎn)品的技術(shù)參數(shù),提出了LED無影燈設(shè)計的兩個關(guān)鍵問題,LED光譜的視覺感知和光學(xué)設(shè)計。結(jié)合LED在醫(yī)療中的應(yīng)用,本文提出了采用光譜可調(diào)的LED無影燈增強醫(yī)生視覺感知的可能；針對無影燈日益復(fù)雜的照明要求,提出了用多個自由曲面去解決LED手術(shù)無影燈在實際應(yīng)用中所遇到的光學(xué)難題。 在光學(xué)設(shè)計方面,本文分析了現(xiàn)有光學(xué)多自由曲面理論的原理和局限性,提出了序列多自由曲面設(shè)計方法。該方法可以將較為復(fù)雜的照明需求子目標(biāo)化,根據(jù)子目標(biāo)化之后的照明要求和前置曲面的光學(xué)特性,選取合理的映射關(guān)系,分步去實現(xiàn)最終的照明要求,降低了自由曲面的設(shè)計難度。針對擴展光源的引入,本文還提出了序列自由曲面的優(yōu)化方法,并針對擴展光源實現(xiàn)了一款用于圓形均勻照明的全內(nèi)反射透鏡,驗證了該優(yōu)化理論的實用性。 在視覺感知方面,本文著重研究了LED照明光譜與生物樣品組織對比度之間的關(guān)系。為此,我們建立了一套大型LED測試平臺,該平臺可以為顏色生理、顏色心理相關(guān)實驗提供光譜多樣的照明支持。為了提高LED測試平臺輸出光斑的顏色均勻性,本文通過光斑拼接和對自由曲面透鏡的優(yōu)化實現(xiàn)了針對陣列LED光源的大面積混色。為了量化生物樣品的組織對比度,本文提出了一種對比度評價模型,該模型不僅可以衡量整個組織樣品的對比度信息,同時也可以反映特定區(qū)域的細(xì)節(jié)信息。基于LED測試平臺和組織對比度評價模型,通過一系列的實驗,得到了用于組織對比度增強的局部最優(yōu)LED光譜,為光譜可調(diào)的LED無影燈在光源選擇、光譜優(yōu)化方面提供了有力的數(shù)據(jù)支持。 基于序列光學(xué)多自由曲面設(shè)計方法以及對LED照明視覺效應(yīng)的進一步認(rèn)識,本文提出了兩套自由曲面LED無影燈。為了解決手術(shù)室中普遍存在的氣流擾動問題,本文提出了天吊式LED手術(shù)無影燈,并采用基于序列多自由曲面設(shè)計方法的光學(xué)系統(tǒng),實現(xiàn)了其苛刻的照明設(shè)計要求。為了改進吊塔式無影燈的光學(xué)性能,本文提出了衛(wèi)星式LED多光譜無影燈的概念,結(jié)合LED的排布和自由曲面準(zhǔn)直透鏡的設(shè)計,保證了該無影燈系統(tǒng)良好的照明輸出,并通過模擬和實驗研究了該系統(tǒng)的性能。 最后,本文對光譜可調(diào)LED自由曲面無影燈的研究進行了總結(jié),并提出在今后研究中應(yīng)該注意的問題。
[Abstract]:With the maturity of LED technology and the increasing complexity of medical lighting demand, more and more research has been done on the application of LED in surgical shadowless lamps, and commercial LED shadowless lamp products have begun to appear. Compared with the traditional halogen shadow-free lamp system, although the LED operation shadow-free lamp has obvious advantages, its design theory has not yet formed a mature system. Starting from the development of shadowless lamps, this paper compares the technical parameters of LED shadowless lamps at present, and puts forward two key problems in the design of LED shadowless lamps, the visual perception and optical design of LED spectra. Combined with the application of LED in medical treatment, this paper puts forward the possibility of using spectral adjustable LED shadow-free lamp to enhance the doctor's visual perception. In view of the increasingly complex lighting requirements of shadowless lamps, several free-form surfaces are proposed to solve the optical problems encountered in the practical application of shadowless lamps in LED operation. In the aspect of optical design, this paper analyzes the principle and limitation of the existing theory of optical multi-free surface, and puts forward the design method of sequential multi-free surface. This method can make the complicated lighting demand sub-target. According to the lighting requirement after sub-standardization and the optical characteristics of the front surface, the reasonable mapping relationship can be selected to realize the final lighting requirement step by step. The design difficulty of freeform surface is reduced. In view of the introduction of extended light source, the optimization method of sequential free-form surface is also proposed in this paper, and a total internal reflection lens for circular uniform illumination is implemented for the extended light source, which verifies the practicability of the optimization theory. In the aspect of visual perception, this paper focuses on the relationship between LED illumination spectrum and tissue contrast of biological samples. Therefore, we set up a large-scale LED test platform, which can provide spectral lighting support for color physiology and color psychology related experiments. In order to improve the color uniformity of the output light spot of the LED test platform, a large area color mixing for the array LED light source is realized through spot splicing and optimization of the free-form surface lens. In order to quantify the tissue contrast of biological samples, this paper presents a contrast evaluation model, which can not only measure the contrast information of the whole tissue sample, but also reflect the detail information of the specific area. Based on LED test platform and tissue contrast evaluation model, a series of experiments have been carried out to obtain the local optimal LED spectrum for tissue contrast enhancement, which is selected as a spectral adjustable LED shadow-free lamp in the light source. Spectral optimization provides strong data support. Based on the design method of sequential optical multi-free surface and the further understanding of the visual effect of LED lighting, two sets of free-form surface LED shadowless lamps are proposed in this paper. In order to solve the problem of airflow disturbance in operating room, this paper presents a skysuspended LED operation shadow-free lamp, and an optical system based on sequential multi-free surface design method is adopted to realize its demanding lighting design requirements. In order to improve the optical performance of tower-type shadow-free lamp, the concept of satellite-type LED multi-spectral shadow-free lamp is proposed in this paper. Combining with the arrangement of LED and the design of free-form surface collimation lens, the good lighting output of the shadowless lamp system is guaranteed. The performance of the system is studied by simulation and experiment. Finally, this paper summarizes the research of spectral adjustable LED free-form surface shadowless lamp, and puts forward some problems that should be paid attention to in the future research.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM923.34
本文編號：2443112
[Abstract]:With the maturity of LED technology and the increasing complexity of medical lighting demand, more and more research has been done on the application of LED in surgical shadowless lamps, and commercial LED shadowless lamp products have begun to appear. Compared with the traditional halogen shadow-free lamp system, although the LED operation shadow-free lamp has obvious advantages, its design theory has not yet formed a mature system. Starting from the development of shadowless lamps, this paper compares the technical parameters of LED shadowless lamps at present, and puts forward two key problems in the design of LED shadowless lamps, the visual perception and optical design of LED spectra. Combined with the application of LED in medical treatment, this paper puts forward the possibility of using spectral adjustable LED shadow-free lamp to enhance the doctor's visual perception. In view of the increasingly complex lighting requirements of shadowless lamps, several free-form surfaces are proposed to solve the optical problems encountered in the practical application of shadowless lamps in LED operation. In the aspect of optical design, this paper analyzes the principle and limitation of the existing theory of optical multi-free surface, and puts forward the design method of sequential multi-free surface. This method can make the complicated lighting demand sub-target. According to the lighting requirement after sub-standardization and the optical characteristics of the front surface, the reasonable mapping relationship can be selected to realize the final lighting requirement step by step. The design difficulty of freeform surface is reduced. In view of the introduction of extended light source, the optimization method of sequential free-form surface is also proposed in this paper, and a total internal reflection lens for circular uniform illumination is implemented for the extended light source, which verifies the practicability of the optimization theory. In the aspect of visual perception, this paper focuses on the relationship between LED illumination spectrum and tissue contrast of biological samples. Therefore, we set up a large-scale LED test platform, which can provide spectral lighting support for color physiology and color psychology related experiments. In order to improve the color uniformity of the output light spot of the LED test platform, a large area color mixing for the array LED light source is realized through spot splicing and optimization of the free-form surface lens. In order to quantify the tissue contrast of biological samples, this paper presents a contrast evaluation model, which can not only measure the contrast information of the whole tissue sample, but also reflect the detail information of the specific area. Based on LED test platform and tissue contrast evaluation model, a series of experiments have been carried out to obtain the local optimal LED spectrum for tissue contrast enhancement, which is selected as a spectral adjustable LED shadow-free lamp in the light source. Spectral optimization provides strong data support. Based on the design method of sequential optical multi-free surface and the further understanding of the visual effect of LED lighting, two sets of free-form surface LED shadowless lamps are proposed in this paper. In order to solve the problem of airflow disturbance in operating room, this paper presents a skysuspended LED operation shadow-free lamp, and an optical system based on sequential multi-free surface design method is adopted to realize its demanding lighting design requirements. In order to improve the optical performance of tower-type shadow-free lamp, the concept of satellite-type LED multi-spectral shadow-free lamp is proposed in this paper. Combining with the arrangement of LED and the design of free-form surface collimation lens, the good lighting output of the shadowless lamp system is guaranteed. The performance of the system is studied by simulation and experiment. Finally, this paper summarizes the research of spectral adjustable LED free-form surface shadowless lamp, and puts forward some problems that should be paid attention to in the future research.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM923.34
【參考文獻】
相關(guān)期刊論文 前2條
1 吳仍茂;屠大維;黃志華;;一種實現(xiàn)大功率LED均勻照明的投射器設(shè)計[J];應(yīng)用光學(xué);2009年03期
2 張新;許英朝;;光學(xué)自由曲面的檢測方法[J];中國光學(xué)與應(yīng)用光學(xué);2008年Z1期
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