In this paper, based on the collaborative integration and modeling calculation of single-point Laser Doppler Vibrometer (LDV), a 3D oblique non-contact dynamic attitude measurement system is proposed. By using two groups of three-dimensional measurement devices which consist of three LDVs, our system can measure the translation and rotation of the measured object. The experiments are carried out under line vibration environment, and the elicited results are compared to those elicited using fiber optic gyroscope (FOG), which verified the feasibility of our system.
In this paper, a novel optical method is proposed to effectively double the sensitivity of FOGs. Two fiber polarization combiner/splitters (PCS) are added in the traditional FOG optical path, which are able to either combine two orthogonal polarizations transmitting at two different PM fibers into the two orthogonal axes of one PM fiber respectively or split two polarizations transmitting at the two orthogonal axes of one PM fiber into two polarizations to transmit at two different PM fibers respectively. Through the specific placement and coupling of these two fiber polarization combiner/splitters, the incident light can transmit twice along the light path of FOG. The experimental setup is established and the method is verified experimentally. The results show that the proposed method will effectively improve the sensitivity and the signal-to-noise ratio (SNR) of FOG without increasing the length of fiber coil, which is very benefit to improve the technology of FOGs, as well as the miniaturization of FOGs.
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