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摘要: Y)F(-H) qhvT," 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。 y[85eM qMVuFwPhi 背景: EK=0oy[ 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。 kN1R8| pv 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。 ,M?8s2? 图1. RPC Photonics工程漫射体结构及光束投射形状 -O?HfQ Qx,#Hj |[iO./zP 步骤 aY?VP?BL Miw=2F 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。 I50LysM h M7 SGEV 图2. RPC Photonics工程漫射体不同类型的散射数据 KCbJ^Rln 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) BWxJ1ENM
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 ![ce } 例如下所示: _[z)%`kay Sample name: EDF-C1-56 Xwo+iZ(a Merging data from file EDF-C1-56 0-0.txt )#M$ov Finished merging RPC data for sample EDF-C1-56 N[3Y~HX!q FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Zl&ED{k< 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 AQ(n?1LU a. 创建一个新的散射库 )@I] Rk? b. 散射模型命名 ysK J= c. 改变散射模型为“Tabulated BSDF”. y
`FZ 0FI d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 2e1%L,y{W e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 TO5y.M|7 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, nlhv g. 点击OK ]zyT_}& 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 N".BC|r "]G'^ mMl len 脚本代码: dtY8>klI `3ha~+Goo! '#Language "WWB-COM" zF^H*H dl8f]y#Q Option Explicit ?'a>?al%> ]!^wB 3j Sub Main ;}f {o^ ]' Uaux0W 'Cleanup ktynIN ClearOutputWindow() iR9duP+ iOhX\@& Print "Merging RPC Photonics BSDF Data Files" k3t]lGp SetTextColor(255,0,0) J`0dF<<{[y Print "Note: Script should be located in the same folder as the BSDF TXT files." [Q8Wy/o
Q Print "Note: Do not run this script multiple times without deleting the output file between executions." +{=U!}3| SetTextColor(0,0,0) >f Hu z7XI`MZN^ 'Current directory of this script (should be the same as the text files being merged) [^}bc-9?i Dim cDir As String
Nb3O>&J cDir = MacroDir$ & "\" cy!P!t,@ 9]ZfSn) 'Array which will be populated with the list of files to be merged W0mvwYON[ Dim fList() As String, curFile As String e<=Nd,v4; GetFileList( cDir, fList ) VByA6^JR &F#eYEuy Print "" $-pijBiz_ Print "Files found for merging:" vv2[t For Each curFile In fList $v2t6wS," Print Chr(9) & curFile MtPdpm6\ Next X=f %! :oW 16m1` 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. "AXgT[ O Dim nameArray() As String, sampName As String QA^FP8!j nameArray = Split(fList(0)," 0-0.txt") K@2"n|
S; sampName = nameArray(0) cy?#LS Print "" O>vCi& Print "Sample name: " & Chr(9) & sampName N.Q}.(N0 K/Y"oQ2 'Open an output file and write the FRED header data 4noy!h Dim outFile As String >h~ik/|* outFile = cDir & sampName & "_FRED.txt" p>J@"?%^ Open outFile For Output As #1 bM?29cs Print #1, "type bsdf_data" tj*0Y-F~ Print #1, "format angles=deg bsdf=value scale=1" N$t<&5+ L1G)/Vkw 'Loop the file list, skip the two header lines and write the remaining data to file ep},~tPZn Dim lineArray() As String, curLine As Long <3j`Z1J For Each curFile In fList tKuJ &I~ Print "Merging data from file " & curFile fD\Fq'29{ ReadFile( cDir & curFile, lineArray ) t OJyj49^a For curLine = 2 To UBound(lineArray) bFL2NH5 Print #1, lineArray(curLine) 0Ba]Zo Z Next N8kNi4$mp= Next kd"nBb= Hq gg*4# 'Close the output file -~JYfj@ Close #1 C GK]i.N b?,%M^9\` Print "Finished merging RPC data for sample " & sampName J9XH8Grk- Print "FRED formatted data file: " & Chr(9) & outFile j@+$lU*r End Sub 3HcduJntl -'D~nd${ 'Utility function to read the contents of a file into an array of strings. cl4_M{~ Function ReadFile(ByVal fileName As String, _ jy>?+hm? ByRef lineArray() As String) As Long @T L|\T K8[Um!( ReadFile = -1 =6 zK1Z Dim oFSO As Object KTot40osj Set oFSO = CreateObject("Scripting.FileSystemObject") kmu`sk" Erase lineArray :/$_eg0A 6;s[dw5T Dim fid As Long +rSU If oFSO.fileexists( fileName ) Then l.
cp[ fid = FreeFile() R:Ih#2R Open fileName For Input As fid #l- 0$ lineArray = Split(Input(LOF(fid), fid), vbCrLf) YjL'GmL< Close fid ,G="wI End If ,g0t&jITo Set oFSO = Nothing W)T'?b'. Return UBound( lineArray ) /uR/,R++ H =~7g3 End Function eGpKoq7a \Z42EnJ Sub GetFileList( ByVal in_dir As String, _ )'RaMo` 4 ByRef in_flist() As String ) [ "3s IqepR
>5t 'Redimension the file list array 7hPwa3D^ Erase in_flist L$);50E
v)gMNzt 'Tracks how many files are found +zLw%WD[l Dim fCount As Long =)g}$r
&< fCount = 0 9v-Y*\!w. :HY =^$\ 'Recurse directory and search for text files $-t@=N@vO? Dim f As String ,#GB f = Dir$(in_dir & "*.txt") o^"OKHU,S0 While f <> "" +Q);t, ReDim Preserve in_flist(fCount) Rmn{Vui9\ in_flist(fCount) = f H7Z`a QC fCount += 1
qbS6#7D f = Dir$() {=Jo!t;f Wend HRM-r~2:-] ReDim Preserve in_flist(fCount-1) C$C>RYE?. :X-S&SX0 End Sub :wg=H c[ 0`8s! ,!%E\` QQ:2987619807 ao .vB']T
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