RADIATIVE PROPERTIES OF POLAR BEAR HAIR

摘要

Results from reflectivity and transmissivity measurements in combination with Kirchoff's law and Beer's law show that the absorptivity of polar bear hair is approximately the same as the surrounding snow. Therefore, if the outer temperature of the bear fur is close to that of the surrounding ice and snow, the bear becomes invisible in the infrared We predict that if surveyors were to shine a beam in the near infrared, between 10,000 and 5,000 cm~(-1) (1 and 2 microns), they would see polar bears in the Arctic night.