RPC Photonics扩散片BSDF
摘要: 2`ERrh^i" s|Vs#o.P) 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。 s?nj@:4 K|6}g7&X 背景: xdY'i0fh 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。 SrOv*
D 3 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。 eI|~neh
图1. RPC Photonics工程漫射体结构及光束投射形状 cXN0D\%` +9')G-`qj I\rjw$V# 步骤 ^YfAsBs& vl|3WYA 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 #q9BU: C:bA:O
图2. RPC Photonics工程漫射体不同类型的散射数据 [xDIK8d:I 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) S"87 <o 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 '-G,7!.,r% 例如下所示: i12G\Ye Sample name: EDF-C1-56 ]^{5` Merging data from file EDF-C1-56 0-0.txt 0TICv2l! Finished merging RPC data for sample EDF-C1-56 4j i#Q FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt (5[#?_~ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~{kA;uw a. 创建一个新的散射库
!y!s/i&P% b. 散射模型命名 /^&$ma\ c. 改变散射模型为“Tabulated BSDF”.
>Yv#t.! 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 ) ~EYdE qS) 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。 |L-- j 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, zx"0^r} g. 点击OK N5k9o:2 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ,p\*cHB9 F0r5$Pl* =U:]x'g( 脚本代码: U^-J_yq ]Rp<64I o '#Language "WWB-COM" o5Knot)Oy -ucR@P] Option Explicit #}Ays#wA>? : B1
"=ly Sub Main \(5Bi3PA} v yP_qG 'Cleanup 4L,&a+) ClearOutputWindow() Xa&:Hg< Rob:W| Print "Merging RPC Photonics BSDF Data Files" kaDn=
={YM SetTextColor(255,0,0) _qQo}|/q Print "Note: Script should be located in the same folder as the BSDF TXT files." bs?4|#[K Print "Note: Do not run this script multiple times without deleting the output file between executions." u9+)jN<Yh SetTextColor(0,0,0) [~Z#yEiW^ R/^;,. 'Current directory of this script (should be the same as the text files being merged) [FWB Dim cDir As String I&x69 cDir = MacroDir$ & "\" kYd=DY O9p^P%U " 'Array which will be populated with the list of files to be merged Ew9MWlk Dim fList() As String, curFile As String `]Vn[^?D GetFileList( cDir, fList ) z_z'3d.r7 RZj06|r8 Print "" YeF'r.Y Print "Files found for merging:" H{Na'_sL For Each curFile In fList 9AQ2FD Print Chr(9) & curFile 6M8(KN^ Next |'#uV)b0@
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XxWu8 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. .:, 9Tf Dim nameArray() As String, sampName As String P~"""3de4 nameArray = Split(fList(0)," 0-0.txt")
lx~mn~;x sampName = nameArray(0) 6r,zOs-I] Print "" aII:Pzh]B Print "Sample name: " & Chr(9) & sampName wtGb3D"am +Nka,C^O" 'Open an output file and write the FRED header data @(rLn Dim outFile As String P`M1sON~ outFile = cDir & sampName & "_FRED.txt" tLx8}@X" Open outFile For Output As #1 'zTa]y]a Print #1, "type bsdf_data" DAd$u1 Print #1, "format angles=deg bsdf=value scale=1" VH.}}RS% 8L(KdDY 'Loop the file list, skip the two header lines and write the remaining data to file /s`xPxvt Dim lineArray() As String, curLine As Long :SpPT For Each curFile In fList :.\h.H; Print "Merging data from file " & curFile _Hq)mF ReadFile( cDir & curFile, lineArray ) PFeK;`[ For curLine = 2 To UBound(lineArray) _]=, U.a=/ Print #1, lineArray(curLine) lnnt b3q Next OB~74}3; Next (%;D&
~%o eD 7Rv< 'Close the output file 6~q"#94 Close #1 22m'+3I~Y i'vjvc~ Print "Finished merging RPC data for sample " & sampName \[x4 Print "FRED formatted data file: " & Chr(9) & outFile 1Aa=&B2 End Sub 90)rOD1B &]/.=J 'Utility function to read the contents of a file into an array of strings. rx;zd ? Function ReadFile(ByVal fileName As String, _ +UP?M4g ByRef lineArray() As String) As Long #Y<b'7yJ aMjCqu05 ReadFile = -1
6@ )bZ| Dim oFSO As Object rk(0w|zR+ Set oFSO = CreateObject("Scripting.FileSystemObject") u8@>ThPD Erase lineArray uc;QSVWGy8 b; 4;WtBO Dim fid As Long :YZMRJL If oFSO.fileexists( fileName ) Then n7Ia8?8-l fid = FreeFile() c}FZb$q# Open fileName For Input As fid *,DBRJ_*7 lineArray = Split(Input(LOF(fid), fid), vbCrLf) lL:J: Close fid K&noA End If W1J7$ Set oFSO = Nothing U9B|u`72 Return UBound( lineArray ) lq!l{[Xp !xK`:[B End Function Nm=W?i RA+k/2]y! Sub GetFileList( ByVal in_dir As String, _ I2'UC)
0 ByRef in_flist() As String ) QRv2%^L 6y9#am? 'Redimension the file list array W7"ks( Erase in_flist _#+~#U%5n Sf\mg4, 'Tracks how many files are found <&rvv4*H Dim fCount As Long /P0%4aWu= fCount = 0 pJ5Sxgv{; wy$9QN 'Recurse directory and search for text files mko<J0|4 Dim f As String I.\fhNxHY f = Dir$(in_dir & "*.txt") 7>J8\= While f <> "" 6l>$N?a ReDim Preserve in_flist(fCount) $9\!CPZ2 in_flist(fCount) = f 3say&|kJ fCount += 1 Y m|zM1qc f = Dir$() BUcze\+ Wend 9_F2nmEv ReDim Preserve in_flist(fCount-1) l7P~_X_)" kGMI
? End Sub GRb"jF>ut (;' ?56 ALiXT8q QQ:2987619807 T)]5k3{
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