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摘要: *Zk>2<^R z+{,WHjo 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。 ,:Z^$ TUK"nKSZ`. 背景: #-VMg+14 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。 4u;9J*r4 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。 <UP
m=Hb 图1. RPC Photonics工程漫射体结构及光束投射形状 ~uWOdm-"[ )!bUR\ ZP\M9Ja 步骤 =8Jfgq9E eV^d6T$ 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。 1T&Rc4$Sn7 ;|T!#@j 图2. RPC Photonics工程漫射体不同类型的散射数据 ;bzX%f?|G 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) v X~RP
* 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 #N(= 3Cj 例如下所示: /^SAC%PD Sample name: EDF-C1-56 "ww|&-W9 Merging data from file EDF-C1-56 0-0.txt 796\jf$ Finished merging RPC data for sample EDF-C1-56 *iO u' FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt d[^KL;b?6 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Jzji&A~ a. 创建一个新的散射库 MM_k
]-7 b. 散射模型命名 ?t&kb7 c. 改变散射模型为“Tabulated BSDF”. <*ZJaBwWU~ 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 ) `:8J46or 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。 {PP9$>4`l f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, a]17qMl g. 点击OK )>
,wj 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 5^<h}u9 SvM6iZ] (_kp{0r# 脚本代码: 1J=.N|(@Q 2"P99$" '#Language "WWB-COM" -H^oXeN Bs+(L [Z Option Explicit N[]Hc f),TO Sub Main )~4II.`%^ /n~\\9#3 'Cleanup :NHH
Dl ClearOutputWindow() 9O`
m,t {^mNJ Print "Merging RPC Photonics BSDF Data Files" 5,qj7HZF SetTextColor(255,0,0) d<!3`qe Print "Note: Script should be located in the same folder as the BSDF TXT files."
/tV/85r Print "Note: Do not run this script multiple times without deleting the output file between executions." ?&G`{Ey SetTextColor(0,0,0) H&1[nU{?> N7'OPTKt& 'Current directory of this script (should be the same as the text files being merged) M#"524Nz Dim cDir As String AqKz$ cDir = MacroDir$ & "\" v 8T$ &-HJ 0N[&3Ee8 'Array which will be populated with the list of files to be merged (Fq5IGs Dim fList() As String, curFile As String K8n4oz#z GetFileList( cDir, fList ) T{V/+RM v(*C%.M) Print "" Y$N)^=7 Print "Files found for merging:" H gTUy[( For Each curFile In fList 2"|2a@ Print Chr(9) & curFile 0&qr Next UNijFGi GRb*EeT 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. gmIqT
f Dim nameArray() As String, sampName As String pi=-#g(2 nameArray = Split(fList(0)," 0-0.txt") l Z#o+d2Y sampName = nameArray(0) )1N 54FNO Print "" (8v7|Pe8 Print "Sample name: " & Chr(9) & sampName 8^Hn"v G+B~Ix- 'Open an output file and write the FRED header data ;^*Unyt[4] Dim outFile As String hjaT^(Y outFile = cDir & sampName & "_FRED.txt" ]\/tVn.' Open outFile For Output As #1 mNmLyU=d Print #1, "type bsdf_data" u` oq(?| Print #1, "format angles=deg bsdf=value scale=1" o]nw0q?
"UEv&mQ 'Loop the file list, skip the two header lines and write the remaining data to file D9`0Dr}/2 Dim lineArray() As String, curLine As Long x~.:64 For Each curFile In fList F+ E|r6'i Print "Merging data from file " & curFile KIR'$ 6pn~ ReadFile( cDir & curFile, lineArray )
T+N|R For curLine = 2 To UBound(lineArray) O+%WR Print #1, lineArray(curLine) uB!kM Next |
8qBm Next Q{k
At% )p!7#v/@f 'Close the output file 4w#``UY)' Close #1 J=pztASt J_>w 3uY Print "Finished merging RPC data for sample " & sampName {Fzs@,|W. Print "FRED formatted data file: " & Chr(9) & outFile jV(6>BAI_ End Sub Zy|Mz& Vy_2 . 'Utility function to read the contents of a file into an array of strings. P&Pj>!T5
Function ReadFile(ByVal fileName As String, _ rr#K"SP ByRef lineArray() As String) As Long hFiIW77s2 *3T|M@Y ReadFile = -1 Lm@vXgMD Dim oFSO As Object )'*5R <# Set oFSO = CreateObject("Scripting.FileSystemObject") hJzxbr
< Erase lineArray LH:i| I >~K
qg~ Dim fid As Long oI^4pwn h If oFSO.fileexists( fileName ) Then Oy 2+b1{ fid = FreeFile() tzy'G"P| Open fileName For Input As fid `/HUV&i"S lineArray = Split(Input(LOF(fid), fid), vbCrLf) %pXAeeSY`; Close fid cBo{/Tn: End If [:^-m8QC Set oFSO = Nothing 0rGSH*( Return UBound( lineArray ) JHf R\XKMF3mN3 End Function 5OoN!TEM Q5%#^ZdsTd Sub GetFileList( ByVal in_dir As String, _ Z}|(FRVk ByRef in_flist() As String ) &Wf3~hmo QdLYCR4f 'Redimension the file list array &Q}*+Y]G Erase in_flist )[1)$-Ru kD bhu^~B 'Tracks how many files are found tgjr&G}a@0 Dim fCount As Long z&V+#Ws/ fCount = 0 PvGDTYcKp T97]P-}
'Recurse directory and search for text files |Yq$sU Dim f As String t%530EB3 f = Dir$(in_dir & "*.txt") M>M`baM1 While f <> "" zD3mX<sw ReDim Preserve in_flist(fCount)
&YDK (&> in_flist(fCount) = f 0euuT@_$ fCount += 1 V'w@rc\XN f = Dir$() kh%{C]".1 Wend ?YeWH
WM ReDim Preserve in_flist(fCount-1) D~o$GW% &i!vd/*WlD End Sub OLI$1d_ pH`44KAuM "QvmqI> QQ:2987619807 j[Uxa
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