From kd7jyk at earthlink.net Thu Jul 31 03:11:32 2014 From: kd7jyk at earthlink.net (KD7JYK DM09) Date: Thu, 31 Jul 2014 00:11:32 -0700 Subject: [Laser] Filter Material. References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com> Message-ID: <023801cfac8e$dbbbdf90$0954fb48@mainframe> This is the closest group I can think of for this request. I have a passive IR motion sensor. The filter is a sheet of black looking plastic about as thick as a sheet of paper. It does not have a lens molded or etched into it. The material is VERY soft and scars easily when cleaned. The ability for the sensor to detect has dropped off considerably, probably due to scratching of the filter. I am looking for a source of IR filter material for replacement. I expected this to be easy, I found one piece, in the UK, about $20USD, about 2 square inches. I don't need much, but the price seems high and the material close to non-existent outside that one piece. I'd prefer glass, up to 1mm thick, but thicker plastic would work just as well. Any ideas on sources? Certainly this is common material? Thanks. Kurt From m0els at yahoo.co.uk Thu Jul 31 03:38:44 2014 From: m0els at yahoo.co.uk (John Randall) Date: Thu, 31 Jul 2014 08:38:44 +0100 Subject: [Laser] Filter Material. In-Reply-To: <023801cfac8e$dbbbdf90$0954fb48@mainframe> References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com> <023801cfac8e$dbbbdf90$0954fb48@mainframe> Message-ID: <1406792324.62066.YahooMailNeo@web172303.mail.ir2.yahoo.com> you could use old 35mm film as a fix. The ends are usually unexposed and may work just as well as a proper IR filter ? Digitally signed mail - M0ELS On Thursday, 31 July 2014, 8:11, KD7JYK DM09 wrote: This is the closest group I can think of for this request. I have a passive IR motion sensor.? The filter is a sheet of black looking plastic about as thick as a sheet of paper.? It does not have a lens molded or etched into it.? The material is VERY soft and scars easily when cleaned. The ability for the sensor to detect has dropped off considerably, probably due to scratching of the filter. I am looking for a source of IR filter material for replacement.? I expected this to be easy, I found one piece, in the UK, about $20USD, about 2 square inches.? I don't need much, but the price seems high and the material close to non-existent outside that one piece. I'd prefer glass, up to 1mm thick, but thicker plastic would work just as well. Any ideas on sources?? Certainly this is common material? Thanks. Kurt ______________________________________________________________ Laser mailing list Home: http://mailman.qth.net/mailman/listinfo/laser Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Laser at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From kb8rtz at oh.rr.com Thu Jul 31 23:42:05 2014 From: kb8rtz at oh.rr.com (Patrick - KB8RTZ) Date: Thu, 31 Jul 2014 23:42:05 -0400 Subject: [Laser] Filter Material. In-Reply-To: <1406792324.62066.YahooMailNeo@web172303.mail.ir2.yahoo.com> References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu> <201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com> <023801cfac8e$dbbbdf90$0954fb48@mainframe> <1406792324.62066.YahooMailNeo@web172303.mail.ir2.yahoo.com> Message-ID: Edmund Optics might have filter material to suit your needs. Sent from the magic of technological innovation On Jul 31, 2014, at 3:38, John Randall wrote: you could use old 35mm film as a fix. The ends are usually unexposed and may work just as well as a proper IR filter Digitally signed mail - M0ELS On Thursday, 31 July 2014, 8:11, KD7JYK DM09 wrote: This is the closest group I can think of for this request. I have a passive IR motion sensor. The filter is a sheet of black looking plastic about as thick as a sheet of paper. It does not have a lens molded or etched into it. The material is VERY soft and scars easily when cleaned. The ability for the sensor to detect has dropped off considerably, probably due to scratching of the filter. I am looking for a source of IR filter material for replacement. I expected this to be easy, I found one piece, in the UK, about $20USD, about 2 square inches. I don't need much, but the price seems high and the material close to non-existent outside that one piece. I'd prefer glass, up to 1mm thick, but thicker plastic would work just as well. Any ideas on sources? Certainly this is common material? Thanks. Kurt ______________________________________________________________ Laser mailing list Home: http://mailman.qth.net/mailman/listinfo/laser Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Laser at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Laser mailing list Home: http://mailman.qth.net/mailman/listinfo/laser Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Laser at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html