Analysis of detection error for spot position in fiber nutation model

Abstract

The influences of nutation trail accuracy, simplification of coupling model, spot position jitter, and power variation of incident light on the detection error are analyzed theoretically. Under the condition of satisfying the requirements, the nutation radius is less than 1.13 μm, the accuracy of the nutation trail is less than 0.04 μm, and the detection range is [−5 μm, +5 μm]. The nutation frequency is 160 times spot position jitter frequency and 100 times intensity jitter frequency of incident light. The analysis is of great significance for determining nutation radius and frequency in the tracking system based on fiber nutation.

Novel laser Doppler tachometer

“…In addition, the distance between the parallel beams is 12 mm, and it is measured by the spot position detector [18] (the fourquadrant detector). Generally, the position detection accuracy of the four-quadrant detector can reach 0.5 μm [19] , and, so, the relative error caused by the distance measurement is 4.2 × 10 −5 0.5 μm=12 mm, which is less than 5 × 10 −5 , so the accuracy is high.…”