An initial phase error elimination in a laser scanner with a multiple phase demodulation method

To have higher resolution of distance in the laser scanner using the phase demodulation method, to demodulate using an intermediate frequency is advantageous. This method is called the multiple phase demodulation method. In the multiple phase demodulation method several frequencies are used for signal processing. These signals are made from the oscillator and the programmable clock source. Even though the clock source is well synchronized with the oscillator, the initial phase error problem can be occurred since the operating points of both signal sources are not exactly simultaneous. In this work, the experimental results are presented to show how the initial phase error problem is solved.