Using the camera phone, the NIRsport emitter looks much brighter than the Octamon emitters, suggesting NIRsport puts out more IR power than the Octamon (Fig. Thus, a phone camera detects some infrared. Using an iPhone camera, the Octamon lights are much brighter than a red object (Figure 2), although the lights and camera look similarly colored red to the human eye. So poor quality cameras may be better to detect near IR, and then IR sources may show up brighter in the camera image. Usually the red sensor will also detect IR, unless there is a good-quality IR filter in front of the lens. By far, most of the power is in the infrared and invisible to the eye.Ī camera has red, green, and blue sensors. Since the upper end of visible light to the eye is 700 nm, the eye can see some of the light from the 760 nm LED, thus the system looks red when it is turned on. A typical spectral spread shows that only a few percent of total power is emitted more than 50 nm away from the spectral peak (Fig. The NIRsport uses LED wavelengths of 760 nm and 850 nm. Since these systems run in the Near IR, we experimented with some non-standard test equipment. We ran experiments to compare the emission signal strengths of the NIRsport and Octomon. They did an interesting experiment comparing the light power between NIRSport and Octamon. This is a guest post by Andrew Gundran and Paul Mazaika, both working with NIRS in Stanford University. Xu Cui Follow Light experiment comparing NIRSport and Octamon
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