[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： HRDpFMA/~  
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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。 k<^M >` $  
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背景： e:9EP,  
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。
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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。 4Qfsxg  
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步骤 `<X-3)>;G  
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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。 bhpku=ov  
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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） chE!,gik  
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 Kg$RT?q-C6  
例如下所示： =L" 0]4K  
Sample name:  EDF-C1-56 p1Zb&:+  
Merging data from file EDF-C1-56 0-0.txt S v>6:y9?G  
Finished merging RPC data for sample EDF-C1-56 P6 OnE18n  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt U+)p'%f;  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ==5F[UX  
a. 创建一个新的散射库 *n? 1C"l  
b. 散射模型命名 \@:,A]  
c. 改变散射模型为“Tabulated BSDF”. cj8cV|8@  
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 ） 1jl!VU6  
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。 p%"dYH%]&0  
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， fo@^=-4A-  
g. 点击OK S1
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 @%R<3!3v  
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脚本代码： "n!yK
  
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'#Language "WWB-COM" c0@8KW[,  
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Option Explicit m.e]tTe  
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Sub Main AC) M2;  
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    'Cleanup I#M3cI!X?  
    ClearOutputWindow() >d2Fa4u3  
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    Print "Merging RPC Photonics BSDF Data Files" yLX $SR  
    SetTextColor(255,0,0) EiW|+@1  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." )|F|\6:ne  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." bV_nYpo  
    SetTextColor(0,0,0) #.bW9j/  
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    'Current directory of this script (should be the same as the text files being merged) Ma[EgG  
    Dim cDir As String p~qe/  
    cDir = MacroDir$ & "\" _IDZ.\'>$  
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    'Array which will be populated with the list of files to be merged 9t"Rw ns  
    Dim fList() As String, curFile As String V8?}I)#(7  
    GetFileList( cDir, fList ) NI >%v  
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    Print "" a:h<M^n049  
    Print "Files found for merging:" *gbK :*_J  
    For Each curFile In fList >gk_klLh  
        Print Chr(9) & curFile :gh[BeqQ)  
    Next e3?=
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. y>^^.  
    Dim nameArray() As String, sampName As String Ey46JO"  
    nameArray = Split(fList(0)," 0-0.txt") d8j1L/e  
    sampName  = nameArray(0) _kj]vbG^;  
    Print "" >H2`4]4]  
    Print "Sample name: " & Chr(9) & sampName T~TP  
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    'Open an output file and write the FRED header data ~C.*Vc?|  
    Dim outFile As String @;Ttdwg#J  
    outFile = cDir & sampName & "_FRED.txt" K}VCFV  
    Open outFile For Output As #1 xt{'Be&Ya+  
    Print #1, "type bsdf_data" Ccf/hA#mb  
    Print #1, "format angles=deg bsdf=value scale=1" tli.g  
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    'Loop the file list, skip the two header lines and write the remaining data to file wbO6Ag@))  
    Dim lineArray() As String, curLine As Long aV3:{oL  
    For Each curFile In fList J3K=z  
        Print "Merging data from file " & curFile hvd}l8  
        ReadFile( cDir & curFile, lineArray ) U2oCSo5:3N  
        For curLine = 2 To UBound(lineArray) 5,RUPaE  
            Print #1, lineArray(curLine)
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        Next
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    Next mo0\t#jA  
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    'Close the output file pm&THd  
    Close #1 lo1Ui`V  
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    Print "Finished merging RPC data for sample " & sampName h~MV=7 lE  
    Print "FRED formatted data file: " & Chr(9) & outFile ${+u-Wfau  
End Sub .1x04Np!  
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'Utility function to read the contents of a file into an array of strings. n\#YGL<n  
Function ReadFile(ByVal fileName As String, _ fCl}eXg6w  
                  ByRef lineArray() As String) As Long )*|/5wW1  
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    ReadFile = -1 c}x1-d8  
    Dim oFSO As Object G7-BeA8  
    Set oFSO = CreateObject("Scripting.FileSystemObject") z`y9<+  
    Erase lineArray i%glQT  
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    Dim fid As Long <P9fNBGa  
    If oFSO.fileexists( fileName ) Then (}"D x3K
 
        fid = FreeFile() [\uR3$j#  
        Open fileName For Input As fid # kI>  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ?HZp@&  
        Close fid +>w]T\[1~  
    End If T X`X5j  
    Set oFSO = Nothing snV*gSUH
 
    Return UBound( lineArray ) e5=d Ev  
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End Function ^6 6!f 5^W  
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Sub GetFileList( ByVal in_dir As String, _ Otn,UoeeB  
                 ByRef in_flist() As String ) }fpya2Xt  
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    'Redimension the file list array  w-jElV  
    Erase in_flist MatXhP] Fi  
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    'Tracks how many files are found 0oe<=L]F  
    Dim fCount As Long ]AP1+ &9fN  
    fCount = 0 I Mgd2qIC  

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    'Recurse directory and search for text files C \ Cc[v  
    Dim f As String Fc[KIG3@  
    f = Dir$(in_dir & "*.txt") yIw}n67  
    While f <> "" 2`yhxO  
        ReDim Preserve in_flist(fCount) BT_]=\zi  
        in_flist(fCount) = f fJ,N.O+9E  
        fCount += 1 rvA>khu0/  
        f = Dir$() h
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    Wend r^9l/H~$  
    ReDim Preserve in_flist(fCount-1) g14
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End Sub ,RP-)j"Wff  
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