JOSE ANTONIO PENAS / SCIENCE PHOTO LIBRARY JOSE ANTONIO PENAS / SCIENCE PHOTO LIBRARY
Body signals. Illustration of the different types of signals and emissions produced by the human body, allowing the detection of people's presence. The examples shown here are body heat (infrared radiation, IR, red), the chemicals produced in sweat (purple), the chemicals produced by breathing (yellow), the electrical activity of the brain (blue), the sound of the beating heart (red circles) and other body sounds (white circles, echoes). See C036/7680 for the unlabelled version.
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