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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 qyMR0ai-  
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    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
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    背景 ^ N]u  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 sygAEL;.  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ukV1_QeN [  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ^{8r(1,  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 3O<:eS~  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) xW*L^97 ;  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 '+BcPB?E  
    例如下所示: 50Z$3T  
    Sample name:  EDF-C1-56 XW6Ewrm=vT  
    Merging data from file EDF-C1-56 0-0.txt ^B2>lx\n  
    Finished merging RPC data for sample EDF-C1-56 .63:G<  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt nG&= $7x^  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,Z*?"d  
    a. 创建一个新的散射库 h^ ex?  
    b. 散射模型命名 ^- T!(P:  
    c. 改变散射模型为“Tabulated BSDF”. M xUj7ae  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) RKaCX:  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ,qJ/Jt$A  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 O3#4B!J$E  
    g. 点击OK I,D24W4l  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 w> `3{MTQ  
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    脚本代码 ]ERPWW;^  
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    '#Language "WWB-COM" W0eb9g`s  
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    Option Explicit ?:OL8&0  
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    Sub Main LBT{I)-K  
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        'Cleanup jdV  E/5  
        ClearOutputWindow() ^2OBc  
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        Print "Merging RPC Photonics BSDF Data Files" {E!ie{~  
        SetTextColor(255,0,0) A-r-^S0\  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." kL,bM.;  
        Print "Note: Do not run this script multiple times without deleting the output file between executions."  49&p~g  
        SetTextColor(0,0,0) Iq.*2aff+  
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        'Current directory of this script (should be the same as the text files being merged) j[Uul#  
        Dim cDir As String N~g @  
        cDir = MacroDir$ & "\" Ua]shSjyI  
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        'Array which will be populated with the list of files to be merged &'9 Jy'(X  
        Dim fList() As String, curFile As String j`Fsr?]/  
        GetFileList( cDir, fList ) ?UnOi1"v9  
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        Print "" ['j_W$8n  
        Print "Files found for merging:" *@|d7aiO  
        For Each curFile In fList mR:G,XytxM  
            Print Chr(9) & curFile ,TaaXI  
        Next !VU[=~  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 5an#,vCn{  
        Dim nameArray() As String, sampName As String /10 I}3D  
        nameArray = Split(fList(0)," 0-0.txt") xM}lX(V!w  
        sampName  = nameArray(0) :<f7;.  
        Print "" j_c0oclSz  
        Print "Sample name: " & Chr(9) & sampName q:@$$}FjL  
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        'Open an output file and write the FRED header data % \Nfj) 9  
        Dim outFile As String E]V:@/(M'  
        outFile = cDir & sampName & "_FRED.txt" 7H~StdL/>  
        Open outFile For Output As #1 1a 4 [w  
        Print #1, "type bsdf_data" _3-nw  
        Print #1, "format angles=deg bsdf=value scale=1" oUXu;@l  
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        'Loop the file list, skip the two header lines and write the remaining data to file B;?)   
        Dim lineArray() As String, curLine As Long #jn6DL@[{  
        For Each curFile In fList ;g$s`l/ 4  
            Print "Merging data from file " & curFile j4Ppn  
            ReadFile( cDir & curFile, lineArray ) <<!XWV*m  
            For curLine = 2 To UBound(lineArray) Dz;^'   
                Print #1, lineArray(curLine) DZKVZ_q  
            Next H/'tSb  
        Next FglCqO}  
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        'Close the output file `G> 6  
        Close #1 vUh.ev0  
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        Print "Finished merging RPC data for sample " & sampName "mr;!"LA  
        Print "FRED formatted data file: " & Chr(9) & outFile n_vopDMm  
    End Sub JTB_-J-TU  
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    'Utility function to read the contents of a file into an array of strings. A$ v Cm  
    Function ReadFile(ByVal fileName As String, _ iHhoNv`MR  
                      ByRef lineArray() As String) As Long ~E&drl\  
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        ReadFile = -1 Z'p7I}-qr  
        Dim oFSO As Object 7c$;-O  
        Set oFSO = CreateObject("Scripting.FileSystemObject") JVE]Qb_  
        Erase lineArray 7@al)G;~  
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        Dim fid As Long i~:FlW]  
        If oFSO.fileexists( fileName ) Then V4'G%!NY  
            fid = FreeFile() pn?c6K vO  
            Open fileName For Input As fid ]X/1u"  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) C^I  h"S  
            Close fid ](c[D9I!8  
        End If gK7j~.bb"  
        Set oFSO = Nothing +~mBo+ ,  
        Return UBound( lineArray ) %tiFx:F+  
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    End Function Ym6zNb8 bQ  
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    Sub GetFileList( ByVal in_dir As String, _ KY$6=/?U_  
                     ByRef in_flist() As String ) ;B>2oq  
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        'Redimension the file list array >v^Bn|_/  
        Erase in_flist i9fK`:)  
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        'Tracks how many files are found P<yd  
        Dim fCount As Long tAH,3Sz( /  
        fCount = 0 |mvy@hm  
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        'Recurse directory and search for text files 0]3%BgZ(a8  
        Dim f As String Z|+SC \Y  
        f = Dir$(in_dir & "*.txt") y)_T!&ze  
        While f <> "" @(2DfrC  
            ReDim Preserve in_flist(fCount) |Q2H^dU'rQ  
            in_flist(fCount) = f vhiP8DQ  
            fCount += 1 oZ;u>MeZ  
            f = Dir$() /pzEL  
        Wend 44_7gOZ  
        ReDim Preserve in_flist(fCount-1) $$+6=r}  
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    End Sub ,W"Q)cL  
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