FINLAND SEPTEMBER
2021
Herschel’s Experiment: descubrimiento del Infrarrojo (IR) NASE's proposal is included in the International Day of Light, which commemorates the day when a human-created laser beam was lit for the first time. It is about repeating Herschel's experiment any day between March 21 to September 23, 2021, and filling the dates the table bellow:
I had a prism with me in Enontekiö, but from 13.9. on the weather was cloudy, so I tried the experiment today in Turku, when the sky was clear. I had only one thermometer and I found, that the measurements are not comparable due to the long period it takes to get the radings with one thermometer. Anyway, I found a 0,6 deg rise with the sensor in the IR region compared with the ambient temparature in shadow - look at the photo. The upper reading is the ambient temperature. One interesting thing I found that my camera is somewhat sensitive to near infrared - in the photo you can see some light in the IR part of the spectrum. I have a 720 nm IR filter, tomorrow I will try to photograph the spectrum with it and compare the photo with a normal photo of the spectrum - if the Sun shines, that is. Thank you for this fascinating experiment!