[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： o%[swoM@  
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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。 trMwFpfu  
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背景： V5bB$tL}3  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 F%G} >xn  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 `clp#l.ii  
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步骤 Oc%W_Gb7  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 #,Cz+k*4  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） |?4NlB6  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 L4or*C^3  
例如下所示： *b\&R%6dR  
Sample name:  EDF-C1-56 o8u;2gZx  
Merging data from file EDF-C1-56 0-0.txt o4nDjFhh  
Finished merging RPC data for sample EDF-C1-56 +PKd </*]  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <j:@ iP  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 |Jny0a/0  
a. 创建一个新的散射库 FPukV^  
b. 散射模型命名 ].Xh=7&2{  
c. 改变散射模型为“Tabulated BSDF”. )w,<XJhg`  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） :?SD#Vvrh.  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 I9*BTT]  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 2$FH+wuW  
g. 点击OK @IV,sze  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 J7+[+Y  
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脚本代码： 2&XNT-Qm  
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'#Language "WWB-COM" >Ft)v  
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Option Explicit 4O
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Sub Main fw)Q1"|  
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    'Cleanup "D'"uMS`H  
    ClearOutputWindow() ji.T7wn1u  
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    Print "Merging RPC Photonics BSDF Data Files" JJy.)-R  
    SetTextColor(255,0,0) /h9v'Y}c  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 4`Lr^q}M+  
    Print "Note: Do not run this script multiple times without deleting the output file between executions."  w>\_d  
    SetTextColor(0,0,0) ]Hg6Mz>Mj  
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    'Current directory of this script (should be the same as the text files being merged) z! :0%qu  
    Dim cDir As String \&[(PNl  
    cDir = MacroDir$ & "\" ox5Wbo
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    'Array which will be populated with the list of files to be merged p4D.nB8  
    Dim fList() As String, curFile As String ojc.ykP$  
    GetFileList( cDir, fList ) U7HfDDh  
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    Print "" Zxh<pd25Y  
    Print "Files found for merging:" J vq)%t8q>  
    For Each curFile In fList g)7@EU2  
        Print Chr(9) & curFile !6,rN_a@Y  
    Next L8(2or  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. }m&\I  
    Dim nameArray() As String, sampName As String 8.Ufw. 5  
    nameArray = Split(fList(0)," 0-0.txt") }46Zfg\T6n  
    sampName  = nameArray(0) 6Ta+f3V  
    Print "" w)&?9?~  
    Print "Sample name: " & Chr(9) & sampName #4<=Ira5  
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    'Open an output file and write the FRED header data ZsSW{ffZ77  
    Dim outFile As String ~O|~M_Z  
    outFile = cDir & sampName & "_FRED.txt" NxnaH!wS  
    Open outFile For Output As #1 &4ndi=.#rg  
    Print #1, "type bsdf_data" nw(R=C  
    Print #1, "format angles=deg bsdf=value scale=1" kW0ctGFYlf  
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    'Loop the file list, skip the two header lines and write the remaining data to file sR/y|  
    Dim lineArray() As String, curLine As Long ubRhJ~XB  
    For Each curFile In fList ) ]DqK<-  
        Print "Merging data from file " & curFile TbLU[(m-n  
        ReadFile( cDir & curFile, lineArray ) _D$1CaAYo  
        For curLine = 2 To UBound(lineArray) Rh#`AM`)j  
            Print #1, lineArray(curLine) 9WI5\`*"  
        Next hu.p;A3p;  
    Next *,t/IA|  
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    'Close the output file g)=$zXWhP  
    Close #1 uQ|LkL%<^  
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    Print "Finished merging RPC data for sample " & sampName Y`d@4*FN$  
    Print "FRED formatted data file: " & Chr(9) & outFile B):ZX#  
End Sub maeQ'Sv_&  
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'Utility function to read the contents of a file into an array of strings. mE_%  
Function ReadFile(ByVal fileName As String, _ |P`b"x  
                  ByRef lineArray() As String) As Long w
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    ReadFile = -1 vxOnv8(  
    Dim oFSO As Object N;,zPWa  
    Set oFSO = CreateObject("Scripting.FileSystemObject")
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    Erase lineArray y4l-o  

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    Dim fid As Long V'tR \b  
    If oFSO.fileexists( fileName ) Then #!E`%' s]  
        fid = FreeFile() QO0@Ax\b  
        Open fileName For Input As fid :,M+njcFc  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) u})*6l.  
        Close fid ?PqkC&o[q  
    End If K^o{lyK;@~  
    Set oFSO = Nothing RyU8{-q  
    Return UBound( lineArray ) :J_UXtx  
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End Function
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Sub GetFileList( ByVal in_dir As String, _ \4^z

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                 ByRef in_flist() As String ) W -HOl!)  
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    'Redimension the file list array t- TUP>_  
    Erase in_flist KC"&3  
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    'Tracks how many files are found &@'%0s9g  
    Dim fCount As Long ij#v_~g3  
    fCount = 0 ,X1M!'  
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    'Recurse directory and search for text files 1L+hI=\O  
    Dim f As String :3XvHL0rx  
    f = Dir$(in_dir & "*.txt") *aC[Tv[-P  
    While f <> "" "" >Yw/'  
        ReDim Preserve in_flist(fCount) ]n>9(Mp!M  
        in_flist(fCount) = f he/rt#  
        fCount += 1 GF9[|). T  
        f = Dir$() a'/C)fplL  
    Wend -s!J3DB  
    ReDim Preserve in_flist(fCount-1) .P7q)lj36h  
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End Sub R9^vAS4t[O  
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