Optical phonons that interact in this way with light are called " infrared active ".
2.
Infrared point sensors can be used to detect hydrocarbons and other infrared active gases such as water vapor and carbon dioxide.
3.
The rear-facing camera has a 16-megapixel sensor with a f / 1.8 aperture lens, infrared active autofocus, three-axis optical image stabilization, and LED flash.
4.
Research forerunners of today's location-based services include the infrared Active Badge system ( 1989 1993 ), the Ericsson-Europolitan GSM LBS trial by J�rgen Johansson ( 1995 ), and the master thesis written by Nokia employee Timo Rantalainen in 1995.
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