[分享]RPC Photonics扩散片BSDF [复制链接]

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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。 dAJ,x =`  
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背景： 0f ER*.F  
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。 h%d^Gq~  
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。 c*\<,n_  
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步骤 ]TO/
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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。 lQPqcZd  
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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） jyW[m,#(go  
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 .M|>u_<Qd  
例如下所示： jigs
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Sample name:  EDF-C1-56 L^9HH)Jc  
Merging data from file EDF-C1-56 0-0.txt w=r&?{  
Finished merging RPC data for sample EDF-C1-56 ]XUl@Y.   
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt upn8n vy4(  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 cErI%v}v0  
a. 创建一个新的散射库 \Z5+$Ij  
b. 散射模型命名 7-iIay1h"  
c. 改变散射模型为“Tabulated BSDF”. )jW(6  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） =7[)'  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ,^T]UHRO  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， B5=3r1Ly  
g. 点击OK 8q_0,>w%  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 euRss#;  
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脚本代码： Jgx8-\8  
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'#Language "WWB-COM" 4!%]fg}Um  
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Option Explicit Ghv{'5w  
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Sub Main ]S/G\z  
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    'Cleanup >[K?fJ$+  
    ClearOutputWindow() g{ (@uzqG  
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    Print "Merging RPC Photonics BSDF Data Files" c>MY$-PD  
    SetTextColor(255,0,0) pDDG_4E>  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." rc~Y=m
 
    Print "Note: Do not run this script multiple times without deleting the output file between executions." fEiJ~&{&  
    SetTextColor(0,0,0) kyAs'R@z  
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    'Current directory of this script (should be the same as the text files being merged) f)gGH'yOQ  
    Dim cDir As String n&7@@@cA  
    cDir = MacroDir$ & "\" g~R/3cm4  
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    'Array which will be populated with the list of files to be merged twbcuaCTW  
    Dim fList() As String, curFile As String -- S"w@  
    GetFileList( cDir, fList ) (4ZLpsbJ  
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    Print "" WB;
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    Print "Files found for merging:" _h~p:=  
    For Each curFile In fList .HOY q  
        Print Chr(9) & curFile nOuN|q=C  
    Next 7jR7  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7 s-`QdWX  
    Dim nameArray() As String, sampName As String Bfn]-]>sD  
    nameArray = Split(fList(0)," 0-0.txt") -&7=uRQk  
    sampName  = nameArray(0) Ei~]iZ}  
    Print "" y3AL)  
    Print "Sample name: " & Chr(9) & sampName jDp]R_i  
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    'Open an output file and write the FRED header data
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    Dim outFile As String !xJFr6G~8  
    outFile = cDir & sampName & "_FRED.txt" )_F(H)
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    Open outFile For Output As #1 q"l>`KCG`  
    Print #1, "type bsdf_data" J;"nm3[.q  
    Print #1, "format angles=deg bsdf=value scale=1" mR6E]TuM  
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    'Loop the file list, skip the two header lines and write the remaining data to file f5N<3m=  
    Dim lineArray() As String, curLine As Long M Yu?&}%^  
    For Each curFile In fList @ikUM+A {  
        Print "Merging data from file " & curFile @b8X%0B7  
        ReadFile( cDir & curFile, lineArray ) 8[f8k3g  
        For curLine = 2 To UBound(lineArray) d7\k gh  
            Print #1, lineArray(curLine) rg"TJ"Q-  
        Next (PyTq 5:F  
    Next v5P*<U Ax  

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    'Close the output file +q$xw}+PK  
    Close #1 '"'D.,[W2  

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    Print "Finished merging RPC data for sample " & sampName _95- -\  
    Print "FRED formatted data file: " & Chr(9) & outFile ?hP<@L6K  
End Sub Q|6Ls$'$  
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'Utility function to read the contents of a file into an array of strings. @Pd) %'s  
Function ReadFile(ByVal fileName As String, _ $:T<IU[E  
                  ByRef lineArray() As String) As Long >SY2LmV'a  
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    ReadFile = -1 [u,hc/PL  
    Dim oFSO As Object 49iR8w?k  
    Set oFSO = CreateObject("Scripting.FileSystemObject") uEc0/a :.  
    Erase lineArray f)p>nW?Z  
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    Dim fid As Long +,ZUTG  
    If oFSO.fileexists( fileName ) Then $]Q*E4(kV9  
        fid = FreeFile() 7F>gj  
        Open fileName For Input As fid #i
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        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 6\NX
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        Close fid g&oc=f`  
    End If aYv'H  
    Set oFSO = Nothing $gj+v+%N  
    Return UBound( lineArray ) s9ju/+fv  
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End Function I?^Q084  
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Sub GetFileList( ByVal in_dir As String, _ j?d;xj  
                 ByRef in_flist() As String ) t1.zWe+C>3  
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    'Redimension the file list array -z>Z0viA  
    Erase in_flist i?&4SG+2~K  
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    'Tracks how many files are found mK7^:(<.LO  
    Dim fCount As Long Tb!B!m  
    fCount = 0 rC1qGzg\a  
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    'Recurse directory and search for text files Q*mMF@-:  
    Dim f As String #G[ *2h~99  
    f = Dir$(in_dir & "*.txt") 9" }^SI8  
    While f <> "" &dwI8@&  
        ReDim Preserve in_flist(fCount) 2heWE  
        in_flist(fCount) = f #LrCx"_&  
        fCount += 1 (TbB?X}  
        f = Dir$() OGE#wG"S  
    Wend "OS]\-  
    ReDim Preserve in_flist(fCount-1) b Q9"GO<X  
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End Sub ]'1N_m]?  
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