Phase measurement with the help of the Lissajous figures

Posted By on October 22, 2014


Download PDF
Successive Approximation Type Analog to Digital Converter
Light Emitting Diode

When using an oscilloscope, we can plot one sinusoidal signal along the x-axis against another sinusoidal signal along the y-axis. The result is a Lissajous figure. Lissajous figures tells us about the phase difference between the two signals and the ratio of their frequencies. Five such figures are shown in figures 1-5 below.

Lissajous Figure
Fig. 1: Two sine waves of equal frequency, in phase.
Lissajous Figure
Fig. 2: Two sine waves of equal frequency, 180 degrees out of phase.
Lissajous Figure
Fig. 3: Two sine waves of equal frequency, 90 degrees out of phase.
Lissajous Figure
Fig. 4: Two sine waves, in phase, frequency of horizontal wave twice frequency of vertical wave.
Lissajous Figure
Fig. 5: Two sine waves, in phase, frequency of horizontal wave three times frequency of vertical wave.
Successive Approximation Type Analog to Digital Converter
Light Emitting Diode

Download PDF

Posted by Akash Kurup

Founder and C.E.O, World4Engineers Educationist and Entrepreneur by passion. Orator and blogger by hobby

Website: http://world4engineers.com