From t-kimura@asahi-spectra.co.jp Wed Mar 23 05:25:29 2005 Date: Wed, 23 Mar 2005 14:24:59 +0900 From: Toshihiko Kimura To: Vik Dhillon Cc: Stu Littlefair , Tariq Shahbaz , Tom Marsh Subject: Re: Perfect NaI filter! Hi Dr.Vik I send you the transmission data of each filter. We measured both filters by Cary spectrophotometer in our factory. Again, I attach the computer-simulated data of bandpass film, where you will find the difference of CWL and FWHM between f/2.3 and incident angle 0 degree. As you know we have the spectrophotometer with collimated beam. It means the measured data were obtained under incident angle 0 degree. Our simulation says variation will be as follows ; 0 degree f/2.3 CWL 592nm => 590nm FWHM 31.3nm => 31.2nm (almost same) > 2.Bandpass Film > Taget center wavelength in the beam f/2.3 is 590nm. > Tolerance of CWL and FWHM is as you described. >> - CWL: 590nm +/- 2nm >> - FWHM: 31nm +/- 2nm Measured data says, 0 degree f/2.3(estimation by simulation) No.1 CWL 593.2nm => 591.2nm (It meets spec) No.2 CWL 593.1nm => 591.1nm (It meets spec) > The optical thickness is perfect - we obtained parfocal images using > the g', u' and NaI filters together in ULTRACAM! Good ! (I was worried about it) I will tell our staffs, who calculated the optical thickness and polished each substrate. > I'll instruct the finance office here to make payment as > soon as possible. I will send you commercial invoice for Univ.of Sheffield by airmail. I don't think it is necessary to mention.... If the payment will be done by check, please send it by registered mail. And please write, "Attn.Toshihiko Kimura" on the envelope. If the payment will be done by remittance, please remit our account as below. ---------------------------------------------------------------- Bank : The Bank of Tokyo-Mitsubishi, Ltd. Akabane Branch SWIFT code : BOTKJPJT. http://www.btm.co.jp/english/index.htm Current Account No. : 1054975 Account Holder's Name : Asahi Spectra Co., Ltd. Address : 1-9-6, Akabane, Kita-ku, Tokyo 115-0045 Japan Phone No. : +81-3-3901-5123 ---------------------------------------------------------------- I wish your project will create the great achievements and our filter will be able to useful in your observation. Best regards, Toshihiko [ Part 2, Text/PLAIN (Name: "Simulation.txt") 2,302 lines. ] [ Unable to print this part. ] [ Part 3, Text/PLAIN (Name: "Sodium-2.txt") 4,001 lines. ] [ Unable to print this part. ] [ Part 4, Text/PLAIN (Name: "Sodium-1.txt") 4,001 lines. ] [ Unable to print this part. ]