Related by context. Frequent words. (Click for all words.) 80 infra red 72 Infrared 70 infrared radiation 68 infrared laser 68 infrared camera 68 infrared IR 65 infrared wavelengths 63 infrared imaging 62 ultraviolet 62 infrared sensor 62 laser 61 wavelengths 61 infrared detectors 60 infrared sensors 60 sensor 60 infrared cameras 58 lasers 58 gamma ray 57 ultraviolet light 57 CCD camera 57 spectroscopic 57 optical 57 spectrometer 57 imager 56 thermal imaging 56 thermal imager 56 laser beam 56 spectroscopy 55 interferometer 55 UV light 55 optics 54 fluorescence 54 telescopes 54 diffraction 54 wavelength 54 detector 54 XMM Newton 54 ultrasonic 53 detectors 53 spectrometers 53 ultra violet light 53 THz 53 laser beams 53 adaptive optics 53 eyepiece 53 telescope 53 sensors 53 electromagnetic 53 terahertz 52 spectral 52 imagers 52 optically 52 Raman spectroscopy 52 spatial resolution 52 spectra 52 optical telescopes 51 Very Large Telescope 51 thermal imaging camera 51 brightness 51 LED illumination 51 extrasolar planets 51 LIDAR 51 ultra violet 51 extrasolar planet 50 optical microscope 50 X ray 50 scanning electron microscope 50 illumination 50 reflectance 50 Lidar 50 electromagnetic spectrum 50 spectrograph 50 binocular 50 multi spectral 50 reflector 50 millimeter wave 49 laser pulses 49 NASA Cassini spacecraft 49 optic 49 photons 49 photon 49 distant galaxies 48 UV 48 Fluorescence 48 unaided eye 48 FLIR 48 sonar 48 exoplanet 48 NASA Aqua 48 diode laser 48 x ray 48 CCDs 48 electro optic 48 laser pulse 48 photodiodes 48 gamma rays 48 lidar 47 ambient light 47 waveguide 47 parallax 47 thermal imaging cameras