![]() Something that only reflects infrared light would have an emissivity of zero. If an object is only radiating infrared light and not reflecting it at all, that would be an emissivity of 1. The emissivity of an object can have a value between 0 and 1. In the world of infrared cameras, different materials can have a different emissivity. Now is the time to discuss this emission vs. ![]() Then I put different objects in front of the camera to see how they reflected this infrared light. I placed it around a corner so my infrared camera couldn't see it. There is a hot (but not too hot) iron that you can use to make your clothes wrinkle-free. To measure the infrared reflectivity (not a real term) of different shirts, I set up the following experiment. Is a white shirt "infrared white"? Does it reflect more infrared radiation than a black shirt? Perhaps the question should be: Does white reflect MORE thermal radiation than black clothing (I'm equating thermal radiation and infrared light-same thing). Does a white T-shirt reflect thermal radiation from your body back to your body to warm you up? The answer is yes. You only have to wait a few minutes before picking them up to realize that the black paper is hotter. Grab some paper-a white piece and a black piece. In fact, you can even do your own experiment. Other than that, there were no real surprises.īut come on. Yes, it's clear the black shirt was hotter. The black T-shirt on the right measured 131.0 Fahrenheit and the white one on the left was 111.8. OK, technically there is a small problem measuring the temperature, but I will address that shortly. From this image I can get the temperature of the shirts.
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November 2023
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