laser dust monitors
雷射粉尘监视器，粒径量测器

• photon structure
• photontransition
• photonuclear disintegration
• photonuclear excitation
• photo-offset
• photo-optical device
• photo-optical receiving unit
• photo-optical tacking data
• photo-optics
• photooxidation
• photooxygenation
• photooxygenation actinometer
• photopeak
• photopen recorder
• photoperiod
• photoperspectograph
• photophase
• photophobia
• photophone
• photophor
• photophoresis
• photophysics
• photopia
• photopic eye
• photopic range