[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： gq3OCA!cX  
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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。 bU`yymf{L  
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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。 b]?;R  
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。 L$Ar]O)  
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步骤 %nf=[f
 
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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。 qXhf?x  
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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） "0zXpQi,B  
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 hpV /F  
例如下所示： *[:CbFE0y  
Sample name:  EDF-C1-56 luk2fi<$  
Merging data from file EDF-C1-56 0-0.txt yc=#Jn?S  
Finished merging RPC data for sample EDF-C1-56 ik0Q^^1?Y  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9k[},MM  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 {eN{Zh5"  
a. 创建一个新的散射库 F6]!?@  
b. 散射模型命名 ~{Rt4o _W  
c. 改变散射模型为“Tabulated BSDF”. SliQwm5  
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 ） 1'm`SRX#e  
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。 ef:$1VIBda  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， '4lT*KN7\  
g. 点击OK ikG9l&n  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 /M*\t.[ 46  
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脚本代码： RdvTtXg  
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'#Language "WWB-COM" NG!cEo:2aa  
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Option Explicit O8~U<'=*  
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Sub Main Mth`s{sATa  
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    'Cleanup bW.zxQ:  
    ClearOutputWindow() wp*&&0O!  
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    Print "Merging RPC Photonics BSDF Data Files" "q>I?UcZ  
    SetTextColor(255,0,0) pMZf!&tM  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." :Z]hI
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." 3/IWO4?_  
    SetTextColor(0,0,0) })Mv9~&S  
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    'Current directory of this script (should be the same as the text files being merged) &G|jzXE  
    Dim cDir As String xnuv4Z}]t  
    cDir = MacroDir$ & "\" p2c=;5|/Q  
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    'Array which will be populated with the list of files to be merged O-!fOdX8_k  
    Dim fList() As String, curFile As String %OTA5  
    GetFileList( cDir, fList ) c]!D`FA*K  
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    Print "" Pzm!`F^r}  
    Print "Files found for merging:" 5v>{Z0TE[6  
    For Each curFile In fList BOiz ~h6  
        Print Chr(9) & curFile Xt,,AGm}  
    Next &G@-yQ  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 1QF*e'  
    Dim nameArray() As String, sampName As String 0B$7S,2  
    nameArray = Split(fList(0)," 0-0.txt") p1VahjRE-  
    sampName  = nameArray(0) !k= 0X\5L  
    Print "" h;ol"  
    Print "Sample name: " & Chr(9) & sampName &c<}++'h  
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    'Open an output file and write the FRED header data rq(~
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    Dim outFile As String 4>"cc@8&~  
    outFile = cDir & sampName & "_FRED.txt" bu"68A;>  
    Open outFile For Output As #1 O*J_+6  
    Print #1, "type bsdf_data" F2PLy q  
    Print #1, "format angles=deg bsdf=value scale=1" ~Riu*<  
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    'Loop the file list, skip the two header lines and write the remaining data to file OBw`!G*w  
    Dim lineArray() As String, curLine As Long KIAe36.~  
    For Each curFile In fList 97]a-)SA  
        Print "Merging data from file " & curFile (&P0la1  
        ReadFile( cDir & curFile, lineArray ) !G"9xrr1  
        For curLine = 2 To UBound(lineArray) ~ S?-{
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            Print #1, lineArray(curLine) $uFh$f  
        Next EB29vHAt~  
    Next rTsbP40  
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    'Close the output file rxy{a  
    Close #1
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    Print "Finished merging RPC data for sample " & sampName <h@z=ijN  
    Print "FRED formatted data file: " & Chr(9) & outFile +i`Q 7+d  
End Sub SA(UD  
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'Utility function to read the contents of a file into an array of strings. )pZekh]v  
Function ReadFile(ByVal fileName As String, _ Z4HA94  
                  ByRef lineArray() As String) As Long y3KcM#[  
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    ReadFile = -1 $['7vcB^  
    Dim oFSO As Object }ED nLou  
    Set oFSO = CreateObject("Scripting.FileSystemObject") WBw M;S#%  
    Erase lineArray e:$
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    Dim fid As Long I NPYJ#%  
    If oFSO.fileexists( fileName ) Then 2GiUPtO&Gj  
        fid = FreeFile() &'huS?gA9  
        Open fileName For Input As fid >9.5-5"   
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4#@W;'  
        Close fid )H;pGM:  
    End If L8bI0a]r"*  
    Set oFSO = Nothing Y3P.
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    Return UBound( lineArray ) t":W.q
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End Function zmB31' _  
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Sub GetFileList( ByVal in_dir As String, _ %qS]NC  
                 ByRef in_flist() As String ) ^zaKO'KcV  
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    'Redimension the file list array A[^qq UL'  
    Erase in_flist z29qARiX  
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    'Tracks how many files are found d1~_?V'r]  
    Dim fCount As Long VDByj "%  
    fCount = 0 |RR
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    'Recurse directory and search for text files T|o`a+?  
    Dim f As String \);.0  
    f = Dir$(in_dir & "*.txt") 49+ >f
 
    While f <> "" hncS_ZA  
        ReDim Preserve in_flist(fCount) SUH mBo"}  
        in_flist(fCount) = f OuOk=  
        fCount += 1 ,&.W6sW  
        f = Dir$() ?~"`^|d  
    Wend zU f>db  
    ReDim Preserve in_flist(fCount-1) JkSdLj  
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End Sub a -xW8  
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