[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： 'coY`B; 8  
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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。 $}us+hGZ  
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背景： u6MU @?  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 w:=:D=xH2  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 \uJ+~db
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步骤 6/"#pe^  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 /o}i,i$  
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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） rcH{"\F_/  
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 EDF0q i  
例如下所示： z"FxKN~Z  
Sample name:  EDF-C1-56 Re*~C:  
Merging data from file EDF-C1-56 0-0.txt *|;`Gp  
Finished merging RPC data for sample EDF-C1-56 RfT)dS+rAh  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ,<s:* k  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 /^X)>1)j  
a. 创建一个新的散射库 )FfS7 C\.  
b. 散射模型命名 [N"=rY4G  
c. 改变散射模型为“Tabulated BSDF”. !>GDp>0  
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 ） BD]o+96qP  
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~+VeP+p4  
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， 3l$D%y  
g. 点击OK > -(Zx  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 F9A5}/\  
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脚本代码： 15Jc PDV  
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'#Language "WWB-COM" \pP1k.~UnC  
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Option Explicit }2Y`Lr  
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Sub Main NR%_&%qQA  
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    'Cleanup ^a1k"|E?f  
    ClearOutputWindow() [Ov/&jD"  
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    Print "Merging RPC Photonics BSDF Data Files" <5G4|l  
    SetTextColor(255,0,0) 'rVB2 `z-  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." D/,(xWaT  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." <KE%|6oER  
    SetTextColor(0,0,0) JE<h  
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    'Current directory of this script (should be the same as the text files being merged) h*3{IHAQ  
    Dim cDir As String oE0~F|(\1  
    cDir = MacroDir$ & "\" @iB
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    'Array which will be populated with the list of files to be merged 5s>>] .%  
    Dim fList() As String, curFile As String a=6@} l1<  
    GetFileList( cDir, fList ) _!w69>Nj  
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    Print "" 9`KFJx6D  
    Print "Files found for merging:" +HgyM0LFg  
    For Each curFile In fList ;3%Y@FS@  
        Print Chr(9) & curFile b+L!p.:  
    Next u_FN'p=.  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. sN) xNz  
    Dim nameArray() As String, sampName As String RS@G.|  
    nameArray = Split(fList(0)," 0-0.txt") {xICR ~,*  
    sampName  = nameArray(0) aNwx~t]G
 
    Print "" lAo4)  
    Print "Sample name: " & Chr(9) & sampName Y)#,6\=U  
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    'Open an output file and write the FRED header data S@TfZ3Go|  
    Dim outFile As String 
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    outFile = cDir & sampName & "_FRED.txt" bkrl>Im<n  
    Open outFile For Output As #1 ,8cVv->u/  
    Print #1, "type bsdf_data" ^/xb-tuV  
    Print #1, "format angles=deg bsdf=value scale=1" 6 B7F  
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    'Loop the file list, skip the two header lines and write the remaining data to file R0bgt2J  
    Dim lineArray() As String, curLine As Long 64^l/D(  
    For Each curFile In fList IIF <Zkpb  
        Print "Merging data from file " & curFile 1qp
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        ReadFile( cDir & curFile, lineArray ) KTeR;6oZn"  
        For curLine = 2 To UBound(lineArray) kxmsrQ
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            Print #1, lineArray(curLine) %MEWw  
        Next |;I"Oc.w^R  
    Next "{c@}~  
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    'Close the output file W*,$0 t  
    Close #1 `BaJ >%|  
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    Print "Finished merging RPC data for sample " & sampName d@tNlFfS  
    Print "FRED formatted data file: " & Chr(9) & outFile z(#dL>d$'  
End Sub xlh<}Vtp  
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'Utility function to read the contents of a file into an array of strings. nB/`~_9  
Function ReadFile(ByVal fileName As String, _ rqKK89fD'  
                  ByRef lineArray() As String) As Long ]O0u.=1k  
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    ReadFile = -1 #RKd>ig%  
    Dim oFSO As Object e2pFX?  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Digx#'#jf  
    Erase lineArray 3FMYs&0r4  
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    Dim fid As Long kovJ
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    If oFSO.fileexists( fileName ) Then zy|h1.gd  
        fid = FreeFile() 8~O0P=  
        Open fileName For Input As fid \VypkbE+  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) }C$D-fH8sW  
        Close fid O:8Ne*L`D  
    End If
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    Set oFSO = Nothing G'wyH[ d/  
    Return UBound( lineArray ) Dv4H^  
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End Function PtGFLM9R  
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Sub GetFileList( ByVal in_dir As String, _ t Q.%f:|  
                 ByRef in_flist() As String ) 9"}5jq4*  
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    'Redimension the file list array K 28s<i`  
    Erase in_flist Kp!A ay  
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    'Tracks how many files are found v|@EuN14<  
    Dim fCount As Long 6w_TL<S  
    fCount = 0 c@KNyBy2  
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    'Recurse directory and search for text files M} +s_h
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    Dim f As String `9A`
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    f = Dir$(in_dir & "*.txt") r&~]6 U  
    While f <> "" /XdLdA!v  
        ReDim Preserve in_flist(fCount) 48{B}j%oU  
        in_flist(fCount) = f a%QgL&_5  
        fCount += 1
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        f = Dir$() S$a.8Xh  
    Wend JZE<oQ_Jm  
    ReDim Preserve in_flist(fCount-1) TxTxyYd  
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End Sub *9`k$'