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A camera trap with a passive infrared (PIR) sensor A camera trap is a camera that is automatically triggered by motion in its vicinity, like the presence of an animal or a human being. It is typically equipped with a motion sensor —usually a passive infrared (PIR) sensor or an active infrared (AIR) sensor using an infrared light beam.
The device enhances ambient visible light and converts near-infrared light into visible light which can then be seen by humans; this is known as I 2 (image intensification). By comparison, viewing of infrared thermal radiation is referred to as thermal imaging and operates in a different section of the infrared spectrum.
Active infrared night-vision combines infrared illumination of spectral range 700–1,000 nm (just over the visible spectrum of the human eye) with CCD cameras sensitive to this light. The resulting scene, which is apparently dark to a human observer, appears as a monochrome image on a normal display device. [ 13 ]
Infrared films may be shot in standard cameras using an infrared pass filters, although focus must compensate for the infrared focal point. A converted digital camera usually requires that the infrared hot mirror be removed and replaced by a wideband, spectrally flat glass of the same optical path length. Typical glass types used include Schott ...
Infrared light has a range of wavelengths, just like visible light has wavelengths that range from red light to violet. "Near infrared" light is closest in wavelength to visible light, ranging from approximately 700 to 5000 nm and "far infrared" is closer to the microwave region of the electromagnetic spectrum, ranging from approximately 25 to ...
Infrared vision is the capability of biological or artificial systems to detect infrared radiation.The terms thermal vision and thermal imaging [1] [2] are also commonly used in this context since infrared emissions from a body are directly related to their temperature: hotter objects emit more energy in the infrared spectrum than colder ones.
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