John, sorry, I didn't read the word near. Pedro At 01:43 PM 2/26/98 -0500, John Shreffler wrote: >Pedro: >That is why I said "near IR", as opposed to those cameras >that can literally see you in the dark from your body heat. >Most CCDs peak in the 800-900 range. They are covered >by a blue tinted flat glass which cuts their peak response. >That filter typically is held by a plastic snap-in frame, and >can be removed easily. Then, you can do all sorts of >nocturnal wild life and spy stuff at night, using an IR diode >flashlight. >John > >-----Original Message----- >From: Pedro Barrios [SMTP:barrios@NANOFAB.TAMU.EDU] >Sent: Thursday, February 26, 1998 10:51 AM >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: [OT] Infrared CCD > >>Remove the IR cut filter from the CCD in any camera >>and you have a dandy near IR camera. > > >Not quite. Si is only good up to a wavelength of about >1100 nm (preferable 800-900 nm). If you want to go >beyond that you will have to use Ge or InGaAs or >InGaSb. Their use depends on what range you want >to be able to detect. > >A japanese distributor is Hamimatzu, but prices >are exorbitant. > >Good luck trying to find the right one (cheap one) for >your application. > >Regards, > >Pedro > > > > > >Attachment Converted: "C:\MYFILES\EUDORA\Attach\WINMAIL9.DAT" >M5!$``P5 ! `@=VAY($D$(',+<&0@(FYE@0K!25(B+"!A!" P;W!P;Q$P&2!T >M;T4:D&@:42!C80> T&M 8,1LP`Z!L:7)T&V%L;!BP$3 ;$'E?"& 8 >M4 .@&M ;$&0*P&O>( -2'6(%P ;@9!BP'? U&# N%[1-&E %0$-#.D0$(' 9 >M8!Y0';4X,&@P+3DA@" ;< \@9>@N(" 8$&48L K &Q'<;W8$D F %[1B(J$? >M`'\*01J0"X !H&R!U=+L$(!WA:07 (+,)<',: >M0'<`@"(P%[EF`Q =YP#> 8X&YA<"UO >M';$#4!M!&=%N(V4<4F+_&Q )< 1@(R 9(!E@`) =`-TB1&X9T!UR'%)D&K < >MX3<8X D1&@%F"N,*@&YO_&-T"' JH ,@`_ ID1R0[F8;$"N!&.!P'1$P``$@ >M1QG@!4 #`&=H=!G0==\`D \@*W$9D1X0:01Q%[0Y#O%S:!R0,D$?I4IO/F@+ >MD!?#-5@+,!R0,S;O`4 6D % $L!O'+ O\!($4#$V("TX$D\%$&?["X P04T' >MD!CP(B X$S56#SM8AMOSS@!F ",#U'&! (<',>(()Y&=!&96)R=0K "1BP,C89T#$Y.3BA0V P.C4Q >M$7!-0*<&5!>1/69)0TQ)4P!40$U)5%9-08XN1@% 4D"H=6)J-U$1/4=293H^ >MH$]47?T8P&XK$0EQ(%(YOSK*-G3["[87PSY(<"RB'=,S(27Q_R@F'G,=XB!A >M':(`M(D!3:1A2`B#9'0%G;P1P,H!P&I(D`.IW40%L"?!G&M O,@&@MPA@-W 7PS$/ >M0!%@;AZ@?B@2P $0&V$"8"%85^ I_2) 22]0'7)6``(P&I)5,/\C=2*0`B : >M@1@B6=,#$ ,@[U#S&J$RD!L01QL0!