[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： $fmTa02q>  
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RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 3YHEH\60^  
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背景： IrMHAM5K  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 l~i?  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 jE*{^+n  
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步骤 2? qC8eC  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 6KMO*v  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） XQo
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3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 \ %Mcvb.?  
例如下所示： duaF?\vv  
Sample name:  EDF-C1-56 9{u=  
Merging data from file EDF-C1-56 0-0.txt P([!psgu  
Finished merging RPC data for sample EDF-C1-56 /j~~S'sw  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 'H530Y\  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ;z'&$#pA  
a. 创建一个新的散射库 rtj/&>  
b. 散射模型命名 W'C>Fn}lO?  
c. 改变散射模型为“Tabulated BSDF”. ~/L:$  
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 ） "wgPPop  
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。 OG5{oH#K  
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， J :O!4gI  
g. 点击OK 8,U~ p<Gz  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 #_DpiiS,.Q  
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脚本代码： p*Z<DEh#  
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'#Language "WWB-COM" 2R\K!e  
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Option Explicit Z>g72I%X  
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Sub Main >V"{]v  
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    'Cleanup ?w:\0j5~  
    ClearOutputWindow() xrf|c  
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    Print "Merging RPC Photonics BSDF Data Files" ctP+ECH  
    SetTextColor(255,0,0) @NM0ILE  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." !]F`qS>  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Xh8U}w<k6  
    SetTextColor(0,0,0) Va?]:Q  
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    'Current directory of this script (should be the same as the text files being merged)  .\oz  
    Dim cDir As String DGHSyB^+1  
    cDir = MacroDir$ & "\" YuhfPa  
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    'Array which will be populated with the list of files to be merged wq?"NQ?O<  
    Dim fList() As String, curFile As String \'2rs152  
    GetFileList( cDir, fList ) && ]ix3  
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    Print "" RvR.t"8  
    Print "Files found for merging:" :W)lt28_  
    For Each curFile In fList jRsl/dmy  
        Print Chr(9) & curFile K@p9_K8  
    Next )<QX2~m<  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. XJo.^<m  
    Dim nameArray() As String, sampName As String /`M#  
    nameArray = Split(fList(0)," 0-0.txt") _gMr]%Q  
    sampName  = nameArray(0) o33t~@RX  
    Print "" ,1I-%6L  
    Print "Sample name: " & Chr(9) & sampName z?DCQ  
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    'Open an output file and write the FRED header data t^&hG7L_m,  
    Dim outFile As String 9wx]xg4l"  
    outFile = cDir & sampName & "_FRED.txt" F > rr.  
    Open outFile For Output As #1 a<-aE4wdm  
    Print #1, "type bsdf_data" ?l~qb]._  
    Print #1, "format angles=deg bsdf=value scale=1" >,,`7%Rv  
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    'Loop the file list, skip the two header lines and write the remaining data to file |M?s[}ll  
    Dim lineArray() As String, curLine As Long ?GX@&_
  
    For Each curFile In fList 6|=]i-8  
        Print "Merging data from file " & curFile yV`Tw"p  
        ReadFile( cDir & curFile, lineArray ) fgqCX:SWz  
        For curLine = 2 To UBound(lineArray) T`^Jws{;7  
            Print #1, lineArray(curLine) `
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        Next @v`.^L{P  
    Next * K$U[$s  
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    'Close the output file Yz;7g8HI  
    Close #1 P<
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    Print "Finished merging RPC data for sample " & sampName `a52{Wa  
    Print "FRED formatted data file: " & Chr(9) & outFile zsuq
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End Sub b"\lF1Nf&o  
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'Utility function to read the contents of a file into an array of strings. 5BA:^4zr?  
Function ReadFile(ByVal fileName As String, _ i=/hLE8T*  
                  ByRef lineArray() As String) As Long ;'Hu75ymo  
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    ReadFile = -1 Hya.OW{  
    Dim oFSO As Object l[~$9C'ji  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Zb_A(mnzh  
    Erase lineArray gdCit-3  
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    Dim fid As Long }J?,?>Z  
    If oFSO.fileexists( fileName ) Then CA|l| t^  
        fid = FreeFile() "'t f]s  
        Open fileName For Input As fid 9Tr ceL;  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) `}`Qqv  
        Close fid FI:
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    End If \5tG>>c i  
    Set oFSO = Nothing Vs
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    Return UBound( lineArray ) $hc=H
  
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End Function K. B\F)K  
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Sub GetFileList( ByVal in_dir As String, _ _N:$|O#  
                 ByRef in_flist() As String ) v6G1y[Wl  
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    'Redimension the file list array I~6(>Z{  
    Erase in_flist ;HAvor=?  
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    'Tracks how many files are found u ]y[g  
    Dim fCount As Long )n"0:"Ou  
    fCount = 0 <o9i;[+H-  
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    'Recurse directory and search for text files c|3oa"6T>  
    Dim f As String M]X!D7  
    f = Dir$(in_dir & "*.txt") /":/DwI'  
    While f <> "" M._E$y,5  
        ReDim Preserve in_flist(fCount) Ge({sy>X  
        in_flist(fCount) = f iz;5:  
        fCount += 1 4pMp@b  
        f = Dir$() 0'f\>4B  
    Wend ysi=}+F.  
    ReDim Preserve in_flist(fCount-1) s]e`q4ip  
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End Sub NRG06M  
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