[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： qyMR
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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。 [`P+{ R  
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背景： ^ N]u  
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。 sygAEL;.  
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。 ukV1_QeN[  
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步骤 ^{8r(1,  
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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。 3O<:eS~  
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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） xW*L^97 ;  
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 '+BcPB?E  
例如下所示： 50Z$3T  
Sample name:  EDF-C1-56 XW6Ewrm=vT  
Merging data from file EDF-C1-56 0-0.txt ^B2>lx\n  
Finished merging RPC data for sample EDF-C1-56 .63:
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt nG&=$7x^  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ,Z*?"
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a. 创建一个新的散射库 h^ ex?  
b. 散射模型命名 ^-T!(P:  
c. 改变散射模型为“Tabulated BSDF”. M xUj7ae  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） RKaCX:  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ,qJ/Jt$A  
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， O3#4B!J$E  
g. 点击OK I,D24W4l  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 w> `3{MTQ  
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脚本代码： ]ERPWW;^  
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'#Language "WWB-COM" W0eb9g`s  
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Option Explicit ?:OL8&0  
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Sub Main LBT
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    'Cleanup jdV E/5  
    ClearOutputWindow() ^2OBc  
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    Print "Merging RPC Photonics BSDF Data Files" {E!ie{~  
    SetTextColor(255,0,0) A-r-^S0\  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." kL,bM.;  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 49&p~g  
    SetTextColor(0,0,0) Iq.*2aff+  
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    'Current directory of this script (should be the same as the text files being merged) j[Uul#  
    Dim cDir As String N~g@  
    cDir = MacroDir$ & "\" Ua]shSjyI  
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    'Array which will be populated with the list of files to be merged &'9 Jy'(X  
    Dim fList() As String, curFile As String j`Fsr?]/  
    GetFileList( cDir, fList ) ?UnOi1"v9  
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    Print "" ['j_W$8n  
    Print "Files found for merging:" *@|d7aiO  
    For Each curFile In fList mR:G,XytxM  
        Print Chr(9) & curFile ,TaaXI  
    Next
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 5an#,vCn{  
    Dim nameArray() As String, sampName As String /10 I}3D  
    nameArray = Split(fList(0)," 0-0.txt") xM}lX(V!w  
    sampName  = nameArray(0) :<f7;.  
    Print "" j_c0oclSz  
    Print "Sample name: " & Chr(9) & sampName q:@$$}FjL  
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    'Open an output file and write the FRED header data % \Nfj)9  
    Dim outFile As String E]V:@/(M'  
    outFile = cDir & sampName & "_FRED.txt" 7H~StdL/>  
    Open outFile For Output As #1 1a4 [w  
    Print #1, "type bsdf_data" _3-nw  
    Print #1, "format angles=deg bsdf=value scale=1" oUXu;@l  
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    'Loop the file list, skip the two header lines and write the remaining data to file B;?)   
    Dim lineArray() As String, curLine As Long #jn6DL@[{  
    For Each curFile In fList ;g$s`l/ 4  
        Print "Merging data from file " & curFile j4Ppn  
        ReadFile( cDir & curFile, lineArray ) <<!XWV*m  
        For curLine = 2 To UBound(lineArray) Dz;^'  
            Print #1, lineArray(curLine) DZKVZ_q  
        Next H/'tSb  
    Next FglCqO}  
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    'Close the output file `G
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    Close #1 vUh.ev0  
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    Print "Finished merging RPC data for sample " & sampName "mr;!"LA  
    Print "FRED formatted data file: " & Chr(9) & outFile n_vopDMm  
End Sub JTB
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'Utility function to read the contents of a file into an array of strings. A$vCm  
Function ReadFile(ByVal fileName As String, _ iHhoNv`MR  
                  ByRef lineArray() As String) As Long ~E&drl\  
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    ReadFile = -1 Z'p7I}-qr  
    Dim oFSO As Object 7c$;-O  
    Set oFSO = CreateObject("Scripting.FileSystemObject") JVE]Qb_  
    Erase lineArray 7@al)G;~  
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    Dim fid As Long i~:FlW]  
    If oFSO.fileexists( fileName ) Then V4'G%!NY  
        fid = FreeFile() pn?c6KvO  
        Open fileName For Input As fid ]X/1u"  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) C^I
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        Close fid ](c[D9I!8  
    End If gK7j~.bb"  
    Set oFSO = Nothing +~mBo+ ,  
    Return UBound( lineArray ) %tiFx:F+  
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End Function Ym6zNb8 bQ  
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Sub GetFileList( ByVal in_dir As String, _ KY$
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                 ByRef in_flist() As String ) ;B>2oq  
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    'Redimension the file list array >v^Bn|_/  
    Erase in_flist i9fK`:)  
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    'Tracks how many files are found P<yd  
    Dim fCount As Long tAH,3Sz( /  
    fCount = 0 |mvy@
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    'Recurse directory and search for text files 0]3%BgZ(a8  
    Dim f As String Z|+SC \Y  
    f = Dir$(in_dir & "*.txt") y)_T!&ze  
    While f <> "" @(2DfrC  
        ReDim Preserve in_flist(fCount) |Q2H^dU'rQ  
        in_flist(fCount) = f vhiP8DQ  
        fCount += 1 oZ;u>MeZ  
        f = Dir$() /pzEL  
    Wend 44_7gOZ  
    ReDim Preserve in_flist(fCount-1) $$+6=r}  
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End Sub ,W"Q)cL  
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