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摘要: Jk=_8Xvr` EA``G8Vn> 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。 Fm#`}K_ 7.y35y 背景: H.)Y*zK0. 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。 [,0[\NC 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。 }.k*4Vw#Wt 图1. RPC Photonics工程漫射体结构及光束投射形状 MLT^7'y Dbg,|UH dMw}4c3E 步骤 MU>6s`6O uc>]-4
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。 kxH`
c `8lS)R! 图2. RPC Photonics工程漫射体不同类型的散射数据 H3>49;` 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) 8= "01 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 5HC5 例如下所示: RRUv_sff Sample name: EDF-C1-56 "&%Lhyt Merging data from file EDF-C1-56 0-0.txt wTe 9OFv Finished merging RPC data for sample EDF-C1-56 ty\F~]Oo FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt *!r"+?0gN 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 #ZyY(S1. a. 创建一个新的散射库 $W;f9k@C! b. 散射模型命名 5V*R
Dh c. 改变散射模型为“Tabulated BSDF”. q|ZzGEj:OV d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt )
9)*218. e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 3lsfT-|Wt& f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, tjg?zlj g. 点击OK M(U<H;Csk 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @j<Q2z^ QAzwNXE+ VOSq%hB 脚本代码: gvFs$X*^: -q30tO. '#Language "WWB-COM" Q2 Dh( %Y-5L;MI Option Explicit 0.kC| Vji:,k=3\ Sub Main aQ*?L
l |,Kk#`lW<f 'Cleanup ^{Fo,7 ClearOutputWindow() B|K^:LUk9 h?Lp9VF Print "Merging RPC Photonics BSDF Data Files" )kEH}P& SetTextColor(255,0,0) v^dQ%+}7> Print "Note: Script should be located in the same folder as the BSDF TXT files." 4MrUo9L$s Print "Note: Do not run this script multiple times without deleting the output file between executions." \SN>Yy SetTextColor(0,0,0) Z+Cjg#+ WH_
W: 'Current directory of this script (should be the same as the text files being merged) muMd9\p Dim cDir As String z&Xk~R*$ cDir = MacroDir$ & "\" FQ>y2n=<d 9qkJ< 'Array which will be populated with the list of files to be merged zF@[S Dim fList() As String, curFile As String lhX4MB" GetFileList( cDir, fList ) N~ajrv}kd VCzb[. Print "" pQi |PQq Print "Files found for merging:" 7Ue&y8Yf For Each curFile In fList 26}fB Print Chr(9) & curFile lnGg1/ Next Z*n4$?%W \]0#jI/: 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. +;,X?E] g Dim nameArray() As String, sampName As String TBZhL nameArray = Split(fList(0)," 0-0.txt") 7 lSR sampName = nameArray(0) m.FN ttkM Print "" N;a' `l Print "Sample name: " & Chr(9) & sampName @&x'.2[nv nRyx2\Py+ 'Open an output file and write the FRED header data mU]pK5 Dim outFile As String $Wu|4]o>9 outFile = cDir & sampName & "_FRED.txt" .X5A7 m Open outFile For Output As #1 FX!Qd&kl1 Print #1, "type bsdf_data" BOD!0CR5 Print #1, "format angles=deg bsdf=value scale=1" {55f{5y3
c m%nRHT0KAf 'Loop the file list, skip the two header lines and write the remaining data to file x*p'm[Tdtm Dim lineArray() As String, curLine As Long 6tGF For Each curFile In fList 22*~CIh~x Print "Merging data from file " & curFile .Fx3WryF ReadFile( cDir & curFile, lineArray ) >2v<;. For curLine = 2 To UBound(lineArray) $pIo`F _W Print #1, lineArray(curLine) DyCkz"1S Next [_`@V4 Next *zMt/d*<& ] &SmeTe 'Close the output file Tz~a. h@ Close #1 Q!r&vQ/g 2St<m-& Print "Finished merging RPC data for sample " & sampName KAi_+/]K_ Print "FRED formatted data file: " & Chr(9) & outFile @yj~5Gf(j End Sub gtIEpYN+ 5LZs_%# 'Utility function to read the contents of a file into an array of strings. E:-~SH} Function ReadFile(ByVal fileName As String, _ P4LiU2C ByRef lineArray() As String) As Long /([a%,DI r?w>x` ReadFile = -1 1h#/8X Dim oFSO As Object $KhD>4^jL Set oFSO = CreateObject("Scripting.FileSystemObject") 6ma.FvSIM Erase lineArray ?mF:L"i NV==[$ (r Dim fid As Long U5OFw+J If oFSO.fileexists( fileName ) Then Xpv<v[a fid = FreeFile() ^Nu j/ Open fileName For Input As fid qL
<@PC.5 lineArray = Split(Input(LOF(fid), fid), vbCrLf) RR|X4h0.
Close fid `sA xk End If ?a*w6,y. Set oFSO = Nothing {c~w
Ms# Return UBound( lineArray ) ?]aVRmL \T!,Z;zK End Function `[e0_g\ O.Y|},F Sub GetFileList( ByVal in_dir As String, _ !E|R3eX_ ByRef in_flist() As String ) 2
6
>9$S cm!|A?-< 'Redimension the file list array 6pt|Crvu Erase in_flist Y;iI=U {:=W)
37U 'Tracks how many files are found w
`+.F;}s Dim fCount As Long neE
Zw#(Z fCount = 0 atW^^4: !&cfX/y8 'Recurse directory and search for text files Y+kuj],h Dim f As String gI9nxy f = Dir$(in_dir & "*.txt") ;JgSA&'e While f <> "" SL/'UoYm< ReDim Preserve in_flist(fCount) 2Nx:Y+[
in_flist(fCount) = f a8v\H8@X fCount += 1 }2\Hg f = Dir$() LpI4R Wend [ w-Tf& ReDim Preserve in_flist(fCount-1) T!Tp:&O- >;F}>_i End Sub vbX.0f "n
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