Lissajous pattern with different phase shift Straight Line (iii) The ratio of the frequency of the two waves.Ĭonsider the two signals applied to have the same amplitude and frequency with the phase difference of Ø between them, In general, the shape of the Lissajous Figures depends on Two sine waves of the same frequency and amplitude may produce a straight line, an ellipse, or a circle depending on their phase difference as shown in the figure below. From the shape or pattern of the resultant figure, the characteristics of the unknown input can be determined in terms of the characteristics of the known input waveform. If two different signals are given to the X and Y-plates, the pattern or figure seen on the screen is the resultant of the two inputs. The waveform seen on the CRO screen will be the same as that given as the Y-input if the internal timebase circuit is used. Lissajous patterns named after a scientist called Lissajous result when sine waves are applied simultaneously to both the horizontal and vertical deflection plates of the CRO. Major axis in lies in second and fourth quadrants.Major axis lies in first and third quadrants.Phase Determination with Lissajous Figures.Frequency Determination with Lissajous Figures.
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