QUOTE(blanket84 @ Apr 23 2024, 04:08 PM)
Faraday cage blocks EM. You're talking about RF, GPS, Phone signal.
Smart tag use IR, hence high IRR would affect the detection.
That's theoretical though. So I would like to know from real world experience does 96% IRR affect smart tag detection.
Majority of these companies don’t actually manufacturer the films themselves. They usually go to OEMs and have their film customized based on some formulas.
From my understanding, these OEMs can customize the sputter type in such a way to let certain frequencies pass. Some of these local companies like IrisPro or Raytech have likely identified the IR frequencies for SmartTag and customized their sputter to allow them to pass.
A better test for IRR (to see if the company is cheating you in their IRR marketing) is, believe it or not, entry keycards. If your film claims IRR 96% but you can enter your condo without lowering your window while stopped parallel to the scanner, you’ve likely been scammed. Note that this doesn’t apply to autogate remotes, because those signals can pass through the parts of the car that are not covered by the tint sputter, like the A or B pillars.
Still, there’s no set standard so it’s very hard to verify a manufacturer’s arbitrary IRR claims unless you have expensive equipment that can measure over a very wide spectrum. Most of the handheld meters used by installers measure only a specific set of peak (λp) wavelengths.
The most common brand of meters used by installers in MY are the Lingshang meters.
Check out their specs;
https://www.linshangtech.com/portable-windo...mission-meters/Notice they all measure only peak wavelengths at either 940nm or 1400nm on the infrared spectrum. Basically they’re measuring IRR only at those specific wavelengths. Anything below, above or in between is not measured. These two wavelength sit on ranges that typically have the biggest effect on the initial burn we feel at the moment of exposure (940nm), or the resonating infrared radiation after the first 45seconds of exposure (1400nm), but they never tell the whole story, which requires measurements between 780-2200nm at 100nm intervals.
This is why it’s impossible to know how well a film performs across a wide range. There’s no ISO or DiN standard mandated for automotive films like there is for aerospace. As a result, we’re playing a lottery. So next time you install a window tint, make sure to buy toto on the same day. Maybe you will kena.
This post has been edited by dev/numb: Apr 23 2024, 06:19 PM