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SparkFun Electronics will be closed in observance of memorial day on Monday, May 29th. We will resume normal business hours on Tuesday, May 30th. Any orders placed after 2pm Mountain Time on Friday, May 26th will process and ship out on Tuesday, May 30th.

Member #412006

Member Since: February 22, 2013

Country: United States

  • Sheet polarizers are designed to work for a specific wavelength range - for sunglasses, this is understandably “visible” (400-700nm or thereabouts). In the IR, this polarizer likely has higher transmission, essentially acting like a longpass filter. As an example, check out this commercically available polarizer:http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=4984 . Transmission increases drastically after 800nm from 40% to 90%.

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