Post by kately on Feb 7, 2024 2:29:30 GMT -5
Due to the size of the currently widely used fiber optic gyroscopes, it has restricted the development of some applications with limited space, such as small unmanned aerial vehicles (UAV), small autonomous underwater vehicles (AUV) and tactical missiles, etc. for their own navigation and positioning modules. With the further development of technology, miniaturized, medium-precision, and low-cost tactical-grade fiber optic gyroscopes will have immeasurable application prospects.
1.Basic principles of FOG technology
FOG is based on the Sagnac effect. In a closed loop composed of an optical fiber ring, two beams of light waves propagate in opposite directions from one of the points. When they circle around the optical fiber ring and return to that point, the phases of the two light beams change. During the rotation of the carrier, Sagnac The phase shift causes the light wave interference fringes to move slightly, and the light propagating in opposite directions travels different distances. The resulting optical path difference is proportional to the angular velocity of rotation. The angular velocity of rotation can therefore be obtained from the optical path difference.
Interferometric FOG (IFOG) has a reciprocal structure, which requires the two beams of light to propagate in the opposite direction to have the same transmission characteristics, the additional displacement is the same, and has a good "common mode suppression" effect, which can eliminate various A parasitic effect, the accuracy is much higher than other interferometers.
In addition to IFOG, there are also resonant FOG (resonant FOG, RFOG), stimulated Brillouin scattering FOG (stimulated Brillouin scattering FOG, BFOG), etc. They work in different ways. RFOG uses a ring resonator to enhance the Sagnac effect and recirculate propagation to improve measurement accuracy. The nucleation sensitive device of RFOG is a fiber ring resonator, and its sensitivity is related to the area enclosed by the fiber resonator. related, regardless of fiber length. The working mechanism of BFOG is to realize the directional gain effect, detect the resonant frequency and obtain the angular velocity.
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Email: info@ericcointernational.com
Whatsapp: +8613992884879
Wechat: 13992884879
1.Basic principles of FOG technology
FOG is based on the Sagnac effect. In a closed loop composed of an optical fiber ring, two beams of light waves propagate in opposite directions from one of the points. When they circle around the optical fiber ring and return to that point, the phases of the two light beams change. During the rotation of the carrier, Sagnac The phase shift causes the light wave interference fringes to move slightly, and the light propagating in opposite directions travels different distances. The resulting optical path difference is proportional to the angular velocity of rotation. The angular velocity of rotation can therefore be obtained from the optical path difference.
Interferometric FOG (IFOG) has a reciprocal structure, which requires the two beams of light to propagate in the opposite direction to have the same transmission characteristics, the additional displacement is the same, and has a good "common mode suppression" effect, which can eliminate various A parasitic effect, the accuracy is much higher than other interferometers.
In addition to IFOG, there are also resonant FOG (resonant FOG, RFOG), stimulated Brillouin scattering FOG (stimulated Brillouin scattering FOG, BFOG), etc. They work in different ways. RFOG uses a ring resonator to enhance the Sagnac effect and recirculate propagation to improve measurement accuracy. The nucleation sensitive device of RFOG is a fiber ring resonator, and its sensitivity is related to the area enclosed by the fiber resonator. related, regardless of fiber length. The working mechanism of BFOG is to realize the directional gain effect, detect the resonant frequency and obtain the angular velocity.
Article source: link
Email: info@ericcointernational.com
Whatsapp: +8613992884879
Wechat: 13992884879