On May 24, 3:54*pm, Phil Hobbs
wrote:
N_Cook wrote:

Or at least translucent to visible. Hopelessly undiscriminating IR encoder &
decoder on a piece of kit but need to see the LED segment display , which
inconveniently has the IR Rx within it.
I've tried loads of normal materials like polythene,perspex, glass, mica,
silicone rubber.
I know black polythene will transmit the IR of PIR units and block visible
but there is more seperation of f there

Short pass filters are harder to make than long pass. *You might try
Edmund Optics.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot nethttp://electrooptical.net

I found these people EXPERTS, they used to make all kinds of optical
band splitters for us.

Also, color correction filters for optic sensors

Optical Coating Lab, Inc.
2789 Northpoint Parkway
Santa Rosa, CA 95407-7350
707 545 6440