Interlaced spiral optical gyroscope

A method of determining a degree of orientation about an axis, the method comprising:

• delivering a laser beam to a first path during a first half of a period and to a second path during a second half of the period;
• delivering a first portion of the beam received from the first path to a first spiral optical ring in a clockwise direction during the first half of the period;
• delivering a first portion of the beam received from the second path to the first spiral optical ring in a counter clockwise direction during the second half of the period;
• delivering a second portion of the beam received from the first path to a second spiral optical ring in a counter clockwise direction during the first half of the period;
• delivering a second portion of the beam received from the second path to the second spiral optical ring in a clockwise direction during the second half of the period, wherein said first and second spiral optical rings are interlaced with one another;
• detecting the beams delivered by the first and second spiral optical rings during the first half of the period to generate a first signal;
• and
• detecting the beams delivered by the first and second spiral optical rings during the second half of the period to generate a second signal.