[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： UrEfFtH'  
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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。 F>[T)t{m=  
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背景：
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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。 jS| 9jg:  
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。 ^ah9:}Ll  
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步骤 C0%yGLh&  
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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。 m>ApN@n  
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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） <#F@OU  
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 \*5${[  
例如下所示： h@yn0CU3.  
Sample name:  EDF-C1-56 :2(U3~3:  
Merging data from file EDF-C1-56 0-0.txt 9B?-&t  
Finished merging RPC data for sample EDF-C1-56 gis
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ;HoBLxb P  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 `D={l29H  
a. 创建一个新的散射库 5l4YYwd>v  
b. 散射模型命名 I::|d,bR!  
c. 改变散射模型为“Tabulated BSDF”. ~X!Z+Vg  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） b ]u01T-  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 fuF!3Q  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， kBg8:bo~  
g. 点击OK 0Tq=nYZA  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 \x;`8H  
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脚本代码： bfXyuv  
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'#Language "WWB-COM" z~(3S8$  
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Option Explicit d=d*:<Zx  
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Sub Main ;9$71E  
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    'Cleanup jIi:tO9G^,  
    ClearOutputWindow() _=-B%m  
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    Print "Merging RPC Photonics BSDF Data Files" VDTt}J8  
    SetTextColor(255,0,0) @A'@%Zv-  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Lv UQ&NmY  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." #gsJ tT9  
    SetTextColor(0,0,0) ^xm%~  
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    'Current directory of this script (should be the same as the text files being merged) xtO#reL"q?  
    Dim cDir As String Fj4>)!^kM  
    cDir = MacroDir$ & "\" vb`R+y@  
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    'Array which will be populated with the list of files to be merged )k.}>0K |  
    Dim fList() As String, curFile As String ez<V  
    GetFileList( cDir, fList ) Dl@Jj?zc  
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    Print "" {hFH6]TA  
    Print "Files found for merging:" Q|xa:`3?  
    For Each curFile In fList ?kdan  
        Print Chr(9) & curFile 7>lM^ :A  
    Next 4i7+'F  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. T.}Y&,n$$5  
    Dim nameArray() As String, sampName As String Kf
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    nameArray = Split(fList(0)," 0-0.txt") ,49Z/P  
    sampName  = nameArray(0) {$g3R@f^~  
    Print "" \{ve6`7Rn  
    Print "Sample name: " & Chr(9) & sampName lHAWZyO  
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    'Open an output file and write the FRED header data :g~_  
    Dim outFile As String slzB#  
    outFile = cDir & sampName & "_FRED.txt" LU/;`In  
    Open outFile For Output As #1 Ad&VOh+0  
    Print #1, "type bsdf_data" !_P&SmK3  
    Print #1, "format angles=deg bsdf=value scale=1" %Ai' 6  
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    'Loop the file list, skip the two header lines and write the remaining data to file vUCmm<y  
    Dim lineArray() As String, curLine As Long :gO5#HIm  
    For Each curFile In fList &`oybm-p(  
        Print "Merging data from file " & curFile 0SDnMij&bf  
        ReadFile( cDir & curFile, lineArray ) 5] LfJh+"n  
        For curLine = 2 To UBound(lineArray) 5th?m>  
            Print #1, lineArray(curLine) hd6O+i Y4  
        Next !2h ZtX  
    Next MU%7'J :_  
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    'Close the output file HuJc*op-6  
    Close #1 $<yhEvv  
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    Print "Finished merging RPC data for sample " & sampName Z&O6<=bg!  
    Print "FRED formatted data file: " & Chr(9) & outFile bQ(-M:  
End Sub 3)yL#hXg)  
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'Utility function to read the contents of a file into an array of strings. v&bG`\!  
Function ReadFile(ByVal fileName As String, _ zy5FO<->  
                  ByRef lineArray() As String) As Long ?}uuTNLl)  
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    ReadFile = -1 bF6J>&]!  
    Dim oFSO As Object `BVmuUMm  
    Set oFSO = CreateObject("Scripting.FileSystemObject") [dAQrou6P  
    Erase lineArray sM+~x<}0  
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    Dim fid As Long K_@?Q@#YhR  
    If oFSO.fileexists( fileName ) Then @$~IPg[J  
        fid = FreeFile() K|YB)y  
        Open fileName For Input As fid JQ6M,O  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Z"RgqNf  
        Close fid fjOq@thD  
    End If R<U]"4CBx  
    Set oFSO = Nothing 0EF~Ouef  
    Return UBound( lineArray ) g/
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End Function vFB^h1k~.M  
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Sub GetFileList( ByVal in_dir As String, _ 4M|uT 9-  
                 ByRef in_flist() As String ) 9h?'zyX B  
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    'Redimension the file list array eIfQ TV  
    Erase in_flist ;0Pv49q  
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    'Tracks how many files are found HC/z3b;  
    Dim fCount As Long |/vJ+aKq  
    fCount = 0 <l$ d>,  
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    'Recurse directory and search for text files U2A 82;Z  
    Dim f As String #,u|*O:  
    f = Dir$(in_dir & "*.txt") 8lL
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    While f <> "" F,{mF2U*$  
        ReDim Preserve in_flist(fCount) o$buoGSPc  
        in_flist(fCount) = f 0'fswa)  
        fCount += 1 @J"tM.  
        f = Dir$() kQ}n~Hn  
    Wend zD79M  
    ReDim Preserve in_flist(fCount-1) r]UF<*$  
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End Sub +)iMJ]>  
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