[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： W2yNEiH  
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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。 R/b)hP~  
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背景： +sE81B  
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。 I\Y/*u  
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。 %6L!JN  
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步骤 6H VS0  
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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。 0d`s(b54;O  
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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） )`-9WCd&  
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 TxN#3m?G  
例如下所示： _9#4  
Sample name:  EDF-C1-56 \[]36|$LS  
Merging data from file EDF-C1-56 0-0.txt +%?_1bGX>  
Finished merging RPC data for sample EDF-C1-56 (IIOKx_  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 twNZ^=SGr  
a. 创建一个新的散射库 F{
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b. 散射模型命名 qK.8^{b  
c. 改变散射模型为“Tabulated BSDF”. b&HA_G4  
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 ） RQ9fA1YP  
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。
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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， *1ku2e]z  
g. 点击OK s7(mNpo  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Ct|iZLh`j  
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脚本代码： $khWu>b  
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'#Language "WWB-COM" tP"C>#LO  
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Option Explicit _?Rprmjx}  
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Sub Main &P&M6v+  
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    'Cleanup \P
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    ClearOutputWindow() &}OaiTzEmc  
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    Print "Merging RPC Photonics BSDF Data Files" A=I]1r  
    SetTextColor(255,0,0) C6M|A3^T  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." "n}J
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." *6df|q  
    SetTextColor(0,0,0) }NMA($@A  
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    'Current directory of this script (should be the same as the text files being merged) d2Z5HFtY  
    Dim cDir As String Uk`ym  
    cDir = MacroDir$ & "\" )%-FnW  
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    'Array which will be populated with the list of files to be merged Cf91#%:cN  
    Dim fList() As String, curFile As String FF0N{bY  
    GetFileList( cDir, fList ) "4<RMYQ  
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    Print "" %nSm 32/t3  
    Print "Files found for merging:" FDbb/6ku  
    For Each curFile In fList Nv,1F  
        Print Chr(9) & curFile a:r8Jzr  
    Next ?T3zA2  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. JF!JY( U,  
    Dim nameArray() As String, sampName As String tSaLR90Y6  
    nameArray = Split(fList(0)," 0-0.txt") Iojyku\W.  
    sampName  = nameArray(0) x{6KsYEY  
    Print "" q_bE?j{  
    Print "Sample name: " & Chr(9) & sampName eee77.@y-p  
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    'Open an output file and write the FRED header data 9utiev~
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    Dim outFile As String Y,w'Op  
    outFile = cDir & sampName & "_FRED.txt" PIR#M('  
    Open outFile For Output As #1  s6bILz-u  
    Print #1, "type bsdf_data" 0{^@kxV  
    Print #1, "format angles=deg bsdf=value scale=1" Yz(k4K L  
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    'Loop the file list, skip the two header lines and write the remaining data to file *oopdGue  
    Dim lineArray() As String, curLine As Long _1Iy/T@1  
    For Each curFile In fList Dk8 O*B
 
        Print "Merging data from file " & curFile d` %8qLIW  
        ReadFile( cDir & curFile, lineArray ) =r"-Pm{  
        For curLine = 2 To UBound(lineArray) R[KF${X4  
            Print #1, lineArray(curLine) 5pSo`)  
        Next 2;Vss<hR4A  
    Next .1n=&d|  

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    'Close the output file ~puXZCatN  
    Close #1 I><B6pIR  
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    Print "Finished merging RPC data for sample " & sampName e_RLKFv7  
    Print "FRED formatted data file: " & Chr(9) & outFile nhV
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End Sub 4'3do>!  
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'Utility function to read the contents of a file into an array of strings. O[}{$NXw  
Function ReadFile(ByVal fileName As String, _ kN7JZ12  
                  ByRef lineArray() As String) As Long #1Zqq([@  
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    ReadFile = -1 g)?Ol  
    Dim oFSO As Object yS#)F.  
    Set oFSO = CreateObject("Scripting.FileSystemObject") TF]bmM})0  
    Erase lineArray f3yH4r?;w  
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    Dim fid As Long x
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    If oFSO.fileexists( fileName ) Then D;nd_{%  
        fid = FreeFile() k1lo{jw`  
        Open fileName For Input As fid EdL2t``  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Lql2ry$Wa  
        Close fid [8C|v61Y  
    End If _+!@c6k)ra  
    Set oFSO = Nothing Q};n%&n&  
    Return UBound( lineArray ) 6a*?m{  
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End Function P"(VRc6x  
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Sub GetFileList( ByVal in_dir As String, _ jJY{np  
                 ByRef in_flist() As String ) Bd'X~Vj<  
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    'Redimension the file list array p< Y-b,&  
    Erase in_flist (]E0fjk  
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    'Tracks how many files are found a8WWFAC[  
    Dim fCount As Long m?<^b_a}  
    fCount = 0 vjL +fH<0:  
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    'Recurse directory and search for text files Ucx"\/"  
    Dim f As String #<LJns\t   
    f = Dir$(in_dir & "*.txt") $7QGi|W*k  
    While f <> "" KqN;a i,F  
        ReDim Preserve in_flist(fCount) L6?~<#-m\M  
        in_flist(fCount) = f "ejsz&n  
        fCount += 1 O#<F"e;$  
        f = Dir$() J9*i`8kU.  
    Wend KE4#vKV0yC  
    ReDim Preserve in_flist(fCount-1) GlHP`&;UH  
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End Sub Pn,>eD*g  
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