-
UID:317649
-
- 注册时间2020-06-19
- 最后登录2025-12-12
- 在线时间1894小时
-
-
访问TA的空间加好友用道具
|
摘要: \78E>(`' FLW VI4* 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。 9`*ST(0/ @U_CnhPQq 背景: I<#X#_YP 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。 CV
@P
+ 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。 712nD ?> 图1. RPC Photonics工程漫射体结构及光束投射形状 @[g7\d M@xU59$@ vIRT$W' O} 步骤 =cEsv&i p*b_"aF 1 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。 vxmX5. J%CCUl2 图2. RPC Photonics工程漫射体不同类型的散射数据 Og 1-LP|X 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) KZ%i&w#< 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 fbh,V%t7 例如下所示: QCbD^ Sample name: EDF-C1-56 x-[ItJ% l Merging data from file EDF-C1-56 0-0.txt Y1h)aQ5{ Finished merging RPC data for sample EDF-C1-56
;2C FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt `6~0W5 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ii?T:T@ a. 创建一个新的散射库 D6L+mTN b. 散射模型命名 :i<*~0r< c. 改变散射模型为“Tabulated BSDF”. +4:eb)e 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 ) G[>NP#P 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。 S~3|1Hw*tN 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, lEHx/#qt9 g. 点击OK Z<;W*6J 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "J"=<_? qx ki EnWv9I< 脚本代码: EIRDH'[L J1G}l5N '#Language "WWB-COM" 7W)W9=&BT ;].X;Ky< Option Explicit blQ&QQL G=zNZ Sub Main Eiu/p&ct tu}!:5xi 'Cleanup bny5e:= d ClearOutputWindow() vxZ'-&;t &x1A{j_ Print "Merging RPC Photonics BSDF Data Files" p-iFe\+ SetTextColor(255,0,0) 67(s\ Print "Note: Script should be located in the same folder as the BSDF TXT files." un 5r9 Print "Note: Do not run this script multiple times without deleting the output file between executions." hP)Zm%@0f SetTextColor(0,0,0) 5REFz t1w]L 'Current directory of this script (should be the same as the text files being merged) DC h
!Z{I Dim cDir As String \#,2#BmO"E cDir = MacroDir$ & "\" Dz0D ^(;V o ks;G([ 'Array which will be populated with the list of files to be merged [`@M!G. Dim fList() As String, curFile As String w x]?D%l GetFileList( cDir, fList ) E4% -*n RH FRN&RU$ Print "" gk|>E[. Print "Files found for merging:" qKD For Each curFile In fList 4G,FJjE`p Print Chr(9) & curFile a]r+np]vTy Next "kP,v&n $bG*f*w 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. J]U_A/f Dim nameArray() As String, sampName As String
)c4tGT< nameArray = Split(fList(0)," 0-0.txt") 7Vy_Cec1 sampName = nameArray(0) DT`HS/~fH Print "" _|u}^MLO Print "Sample name: " & Chr(9) & sampName 3/+kjY/ q5_zsUR= 'Open an output file and write the FRED header data Yk|6?e{+) Dim outFile As String b,^ "-r outFile = cDir & sampName & "_FRED.txt" =_`q;Tu= Open outFile For Output As #1 jQV[zcM Print #1, "type bsdf_data" n}UJ-\$ Print #1, "format angles=deg bsdf=value scale=1" ,Wd=!if VZt%cq 'Loop the file list, skip the two header lines and write the remaining data to file mS'Ad< Dim lineArray() As String, curLine As Long ^UKAD'_#%O For Each curFile In fList C7dq=(p& Print "Merging data from file " & curFile hV(^Y)f ReadFile( cDir & curFile, lineArray ) 3JGrJ!x For curLine = 2 To UBound(lineArray) ',R%Q0Q Print #1, lineArray(curLine) &)OI!^ ( Next bN/8 ~! Next IB&G#2M< >T]9.`xhK 'Close the output file h,$CJdDY] Close #1 GKFRZWXdT P*!`AWn Print "Finished merging RPC data for sample " & sampName 7<)H?;~; Print "FRED formatted data file: " & Chr(9) & outFile j;`pAN(' End Sub r<ww%2HTS 71@eJQ 'Utility function to read the contents of a file into an array of strings. )zxb]Pg+ Function ReadFile(ByVal fileName As String, _ pL,XHR@Iv ByRef lineArray() As String) As Long _ \4#I( <q=Zg7zB ReadFile = -1 f,yl'2{ Dim oFSO As Object , ~
1+MZ= Set oFSO = CreateObject("Scripting.FileSystemObject") Led\S;pl Erase lineArray J>v[5FX+ 4,;*sc 6* Dim fid As Long G{[w+ObX If oFSO.fileexists( fileName ) Then O4X03fUx fid = FreeFile() <KX9>e Open fileName For Input As fid D=^&?@k< lineArray = Split(Input(LOF(fid), fid), vbCrLf) p(pfJ^/:( Close fid |^-D&C(Eu End If y!1X3X,V Set oFSO = Nothing &j:e<{@ Return UBound( lineArray ) &lLk[/b zd5=W"Y;] End Function _fS\p|W(E B}TY+@ Sub GetFileList( ByVal in_dir As String, _ I-^sJ@V; ByRef in_flist() As String ) ~+1mH XnP?hw% 'Redimension the file list array T!]rdN! Erase in_flist =J1V?x=l@ =
zmxki 'Tracks how many files are found KNmU2-%l Dim fCount As Long _6fy'%J=U fCount = 0 4tkT\. PR"x&JG@ 'Recurse directory and search for text files sAc1t` Dim f As String UdrgUqq) f = Dir$(in_dir & "*.txt") kS_#8I While f <> "" )tBz=hy# ReDim Preserve in_flist(fCount) :lXY% [!6P in_flist(fCount) = f ]AA|BeL?| fCount += 1 zd%f5L(' f = Dir$() [KBa=3>{ Wend :!s7B|_U ReDim Preserve in_flist(fCount-1) KWo Ps%G bJn&Y End Sub d(|?gN^
|