Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1993-01-19
1994-09-13
Willis, Davis L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
328162, 328165, 307542, 356345, 25023116, G01B 1102
Patent
active
053473558
ABSTRACT:
In a signal processing apparatus and method, original two-phase signals each having the possibility of amplitude fluctuation are received by an input portion. From the original two-phase signals received by the input portion, new two-phase signals are formed by a signal processing portion. The signal processing portion forms an intermediate stage two-phase signal and a phase component eliminated signal having the phase components of the original signals eliminated therefrom in parallel from the original two-phase signals, and eliminates the fluctuation component of amplitude by the offsetting process of respective ones of the two-phase signals and the phase component eliminated signal to thereby form the new two-phase signals. The new two-phase signals have a predetermined phase relation with the original two-phase signals. The new two-phase signals are output from an output portion. This specification also discloses a displacement detecting apparatus using such a signal processing apparatus.
REFERENCES:
patent: 5120954 (1992-06-01), Taniguichi
Canon Kabushiki Kaisha
Keesee, III LaCharles P.
Willis Davis L.
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