conuter-rotaing wedges
反向旋转光楔

• Four ier spectroscopy
• Fourier synthesis
• fourier transform
• Fourier transformation
• Fourier transform hologram
• Fourier transform interferomether spectrometer
• Fourier transform lens
• Fourier transform operator
• fourier transform spectrometer
• Fourier transform spectromether
• Fourier transform spectroscopy
• Fourier variable
• Fourier wave
• four-layer diode modulator
• four-lens zoom system
• four-level emitter
• four-level fluoresent crystal
• four-level fluoresent solid
• four-level generator
• four-level laser
• four-level laser rod
• four-level laser system
• four-quad solid-state sensor
• four-screw leveling head
• fourstage cascade image intensifier