-
UID:317649
-
- 注册时间2020-06-19
- 最后登录2026-01-28
- 在线时间1922小时
-
-
访问TA的空间加好友用道具
|
摘要: >^@~}]L \H PB{
; 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。 qssK0!- XaU^^K 背景: mX@xV*
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。 -ebyW# 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。 C2hB7?UGN 图1. RPC Photonics工程漫射体结构及光束投射形状 >#;>6q9_ K9RRY,JB 7;#o?6!7 步骤 M;.:YkrUH JVx-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。 );p:[=$71 0)vX
图2. RPC Photonics工程漫射体不同类型的散射数据 )h%tEY$AJ 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) IV`+B<3 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 pe\]}& 例如下所示: <{HV|B7 Sample name: EDF-C1-56 ,G$<J0R1 Merging data from file EDF-C1-56 0-0.txt %:-2P Finished merging RPC data for sample EDF-C1-56 uH} }z ! FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2;SiH]HNS 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8(:O5# a. 创建一个新的散射库 ]PH'G>x b. 散射模型命名 ge&!GO c. 改变散射模型为“Tabulated BSDF”. oHethk d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) CY@#_z e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 V$MMK 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, Q"GZh.m g. 点击OK [-=y*lx%g 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 EHq?yj; N<HJ}geC" #/>OW2Ny 脚本代码: {k<mN
Y $)jf '#Language "WWB-COM" q+9c81b $r(9'm}W Option Explicit 7}fT7tsN S1*xM Sub Main u5P2* K@!Gs'Op 'Cleanup to] ~$~Q|> ClearOutputWindow() \2 `|eo lM%3 ?~?Q& Print "Merging RPC Photonics BSDF Data Files" ekSSqj9"; SetTextColor(255,0,0) JHsxaX;c Print "Note: Script should be located in the same folder as the BSDF TXT files." x?G"58 Print "Note: Do not run this script multiple times without deleting the output file between executions." -h&KC{Xab SetTextColor(0,0,0) |)YN"nqg Zx%6pZ(. 'Current directory of this script (should be the same as the text files being merged) lMb&F[KJ7 Dim cDir As String Z2I2 [pA cDir = MacroDir$ & "\" ,D{D
QJ(B ggzcANCD< 'Array which will be populated with the list of files to be merged 6"U$H$i.G Dim fList() As String, curFile As String m+dJ3 GetFileList( cDir, fList ) o;{BI
Q1 k :`yxxYIh Print "" a`; nB E Print "Files found for merging:" `z6I][Uf For Each curFile In fList 39Tlt~Psz Print Chr(9) & curFile _h P7hhR Next d01]5'f?o =a_ >") 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 2j-^F Dim nameArray() As String, sampName As String pn
aSOyR nameArray = Split(fList(0)," 0-0.txt") F+m;y sampName = nameArray(0) 7SJtW`~ Print "" sk~inIj- Print "Sample name: " & Chr(9) & sampName ee
.,D \) g?mj^ 'Open an output file and write the FRED header data yo!Y%9 Dim outFile As String /n8\^4{fP{ outFile = cDir & sampName & "_FRED.txt" (Ujry =f Open outFile For Output As #1 AP/#?
Print #1, "type bsdf_data" V*F |Yo: Print #1, "format angles=deg bsdf=value scale=1" t'e5!Ma eDS,}Z' 'Loop the file list, skip the two header lines and write the remaining data to file (cm8x Dim lineArray() As String, curLine As Long h~u|v[@{J For Each curFile In fList 4)E$. F^ Print "Merging data from file " & curFile 9 kLA57 ReadFile( cDir & curFile, lineArray ) MW|:'D` For curLine = 2 To UBound(lineArray) )PjU=@$lI Print #1, lineArray(curLine) wF$z ?L Next 7Nlk:f)*- Next jF0>wm 5T]dQ3[v4 'Close the output file XW q@47FR Close #1 CsiRM8 rE9Nt9} Print "Finished merging RPC data for sample " & sampName *w[0uQL5Z Print "FRED formatted data file: " & Chr(9) & outFile o'|B|oZ End Sub I@:"Qee $9?<mP2-* 'Utility function to read the contents of a file into an array of strings. i^"!"&tW# Function ReadFile(ByVal fileName As String, _ O#x=iZI ByRef lineArray() As String) As Long Z90]I<a~ }sW%i#CV ReadFile = -1 ^_\%?K_u Dim oFSO As Object sff4N>XAl< Set oFSO = CreateObject("Scripting.FileSystemObject") nXfdf- Erase lineArray ,d$D0w Nyl)B7/w Dim fid As Long p|Nh:4iN If oFSO.fileexists( fileName ) Then A/ 88WC$v fid = FreeFile() 1}3tpO; Open fileName For Input As fid HlraOp+ lineArray = Split(Input(LOF(fid), fid), vbCrLf) [Lq9lw&
Close fid eR:C?v End If lYhC2f
m_ Set oFSO = Nothing uFn?U) Return UBound( lineArray ) ##a.=gl |X;|=. End Function nt$q< 57 t"jiLOQ[6 Sub GetFileList( ByVal in_dir As String, _ qpV"ii ByRef in_flist() As String ) =TJ9Gr/R&: R$i-%3 'Redimension the file list array q@vqhE4 Erase in_flist j?1wP6/NP Ih)4.lLcKn 'Tracks how many files are found 5Kw?# Dim fCount As Long 1C(sBU" fCount = 0 %{ory5 nB6 $*' 'Recurse directory and search for text files VE?Aa Dim f As String )Bu#ln" f = Dir$(in_dir & "*.txt") cc 0Tb While f <> "" F(|XJN ReDim Preserve in_flist(fCount) DcN!u6sJ in_flist(fCount) = f UHR%0ae fCount += 1 _RE;}1rb, f = Dir$() zJov*^T-C Wend (@V_47o ReDim Preserve in_flist(fCount-1) -`UOqjb]3 J;'H],w}f End Sub (#8B
|