[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： KvEv0L<ky  
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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。 *4NY"EwjN  
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背景： n6.Z{Q'b  
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。 o $W@@aM  
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步骤 &M<"Fmn  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 3<"j/9;K'  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） ZS4dW_*[  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 {U$XHG  
例如下所示： =0
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Sample name:  EDF-C1-56 bGL}nPo  
Merging data from file EDF-C1-56 0-0.txt |LZ{kD|  
Finished merging RPC data for sample EDF-C1-56 dsx<ZwZN>  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt cW_wIy\]&  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 mRRZ/m?A(  
a. 创建一个新的散射库 F-rhxJd  
b. 散射模型命名 %K')_NS@  
c. 改变散射模型为“Tabulated BSDF”. D (8Z90  
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 ） K>e-IxA);0  
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。 ,b -  
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， }BU%<5CQ  
g. 点击OK )Z1&`rv  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 m(MQ  
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脚本代码： p+|8(w9A${  
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'#Language "WWB-COM" JygJ4RI%j  
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Option Explicit 5I1YB+$}e  
} % Ie  
Sub Main ]r3/hDRDL@  
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    'Cleanup )1B?<4  
    ClearOutputWindow() %LP4RZ  
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    Print "Merging RPC Photonics BSDF Data Files" &z40l['4bz  
    SetTextColor(255,0,0) .=Oww  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Z8FgxR  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Nv.  
    SetTextColor(0,0,0) P?f${t+  
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    'Current directory of this script (should be the same as the text files being merged) ;YY<KuT  
    Dim cDir As String i6k6l%  
    cDir = MacroDir$ & "\" 8Cp@k=  
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    'Array which will be populated with the list of files to be merged #J3o~,t<  
    Dim fList() As String, curFile As String VnkhY  
    GetFileList( cDir, fList ) }:c~5whN  
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    Print "" 7r'_p$  
    Print "Files found for merging:" G^nG^HTo5  
    For Each curFile In fList "*D9.LyM  
        Print Chr(9) & curFile u8KQV7E  
    Next n/(}|xYU  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 4GF3.?3  
    Dim nameArray() As String, sampName As String D
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    nameArray = Split(fList(0)," 0-0.txt") \3^V-/SJf  
    sampName  = nameArray(0) i&lW&]  
    Print "" +@!\3a4!  
    Print "Sample name: " & Chr(9) & sampName y7:f^4  
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    'Open an output file and write the FRED header data y*X.DS 1(w  
    Dim outFile As String EGqu-WBS  
    outFile = cDir & sampName & "_FRED.txt" 2bTS,N/>  
    Open outFile For Output As #1 $`W3`}#fM  
    Print #1, "type bsdf_data" Y% \3N  
    Print #1, "format angles=deg bsdf=value scale=1" H!7?#tRU  
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    'Loop the file list, skip the two header lines and write the remaining data to file ZT*}KJm  
    Dim lineArray() As String, curLine As Long }JST(d&  
    For Each curFile In fList CKZEX*mPC  
        Print "Merging data from file " & curFile ~!mY0odH  
        ReadFile( cDir & curFile, lineArray ) j0+D99{R  
        For curLine = 2 To UBound(lineArray) \8<[P(!3  
            Print #1, lineArray(curLine) OAs>F"  
        Next "IQYy~ /  
    Next u;H^4} OQ  
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    'Close the output file (nmsw6 X  
    Close #1 E_A5KLP  
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    Print "Finished merging RPC data for sample " & sampName ]!sCWR  
    Print "FRED formatted data file: " & Chr(9) & outFile r`<e<C  
End Sub ^.)0O3oC  
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'Utility function to read the contents of a file into an array of strings. bws}'#-*  
Function ReadFile(ByVal fileName As String, _ QeFt WjlqC  
                  ByRef lineArray() As String) As Long h>*3i#  
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    ReadFile = -1 \F`>zY2$%  
    Dim oFSO As Object |pBFmm*  
    Set oFSO = CreateObject("Scripting.FileSystemObject") r vq{Dfo=  
    Erase lineArray m%})H"5  
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    Dim fid As Long HxW/t7Z(  
    If oFSO.fileexists( fileName ) Then P3W3+pwq  
        fid = FreeFile() YI*H]V%w  
        Open fileName For Input As fid @<$m`^H
 
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) G)NqIur*Z  
        Close fid >6&Rytcc]  
    End If k)D5>T  
    Set oFSO = Nothing r*mSnPz\q  
    Return UBound( lineArray ) #W
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End Function ~"\v(\Pe  
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Sub GetFileList( ByVal in_dir As String, _ LqI&1$#  
                 ByRef in_flist() As String ) DVwB}W~  
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    'Redimension the file list array 0Cf'\2  
    Erase in_flist
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    'Tracks how many files are found E>-I |X"L1  
    Dim fCount As Long p ]jLs|tat  
    fCount = 0 . 4RU'9M  
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    'Recurse directory and search for text files j~.tyxOq#  
    Dim f As String o-&0_Z
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    f = Dir$(in_dir & "*.txt") 0/|Ax-dK  
    While f <> "" f$5pp=s:n  
        ReDim Preserve in_flist(fCount) 2{BS `f  
        in_flist(fCount) = f VuTTWBx  
        fCount += 1 98 NFJ  
        f = Dir$() ]G8"\J4 &  
    Wend jHE^d<=O^  
    ReDim Preserve in_flist(fCount-1) AZik:C"Q  
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End Sub t OJyj49^a  
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