ambient light filter
保护滤光器(阴极射线管)，背景滤光器

• photon beam
• photon bombardment
• photon bunching
• photon capture
• photon counter
• photon counting spectrophotometer
• photon density
• photon detector
• photon drag detector
• photon drag photodetector
• photon effect
• photonegative effect
• photon emission
• photonephelometer
• photoneutron
• photoneutron emission
• photon excited atom
• photon exitance
• photon fluctuation
• photon flux
• photon-generated carrier
• photonic bandgap
• photonic band-gap (PBG) system
• photonic band structures
• photonic crystal