Abstract:
본 발명은 편광유지형 광섬유, 이를 구비하는 광섬유 자이로스코프 및 편광유지형 광섬유 제조 방법에 관한 것으로, 코어 유닛, 클래딩 유닛 및 응력부여 유닛을 구비하는 상기 편광유지형 광섬유 제조 방법은 상기 코어 유닛과 클래딩 유닛을 구비하는 모재를 성형하는 단계와, 상기 모재의 상기 클래딩 유닛에 대응하는 위치에 삽입홀을 형성하는 단계와, 복수의 분사구를 통하여 이종 재질의 미립자를 분사대상체에 분사하여 제1 및 제2 유리층이 동시에 적층되는 응력부여 프리폼을 성형하는 단계와, 상기 응력부여 프리폼을 상기 삽입홀에 삽입하여 광섬유 프리폼을 형성하는 단계, 및 상기 제1 유리층이 상기 응력부여 유닛을 형성하고 상기 광섬유 프리폼이 광섬유를 형성하도록 상기 광섬유 프리폼를 용융 상태에서 인출하는 단계를 포함한다. 이를 통하여 본 발명은 편광유지형 광섬유를 보다 정밀하게 제조할 수 있게 한다. 편광유지형 광섬유, 응력부여 유닛, 용융점
Abstract:
PURPOSE: A polarization maintaining type optical fiber, an optical fiber gyroscope thereof, and a polarization maintaining type optical fiber manufacturing method thereof are provided to reduce the manufacturing degradation of an optical fiber and to improve the degree of freedom of a design value. CONSTITUTION: A cladding unit(120) surrounds a core unit(110). A stress apply unit(130) is symmetrical to the core unit and is arranged in the cladding unit. The stress apply unit includes a first glass layer and a second glass layer. The first glass layer has a lower melting point than the cladding unit. The second glass layer has a higher melting point than the first glass layer and is radially laminated in the first glass layer.
Abstract:
본 발명은 링 레이저 자이로에 관한 것으로서, 더 상세하게는 공진기 각진동방식을 사용하는 링 레이저 자이로에서 자이로 출력신호를 얻기 위하여 사용하는 각진동 복조기의 샘플링 속도를 개선하는 링 레이저 자이로의 각진동 신호 이중 복조 방법에 대한 것이다.
Abstract:
The present invention relates to a system and a method for enhancing a dead zone in a fiber-optic gyroscope caused by the limited performance characteristics of optical elements composing a fiber-optic gyroscope and, more particularly, to a system and a method for enhancing a dead zone in a fiber-optic gyroscope by identifying direct optical elements with distorted optical phase modulation characteristics, selecting eligible direct optical elements through the identification, and controlling the output intensity of interference signals through an optical attenuator. The present invention can enhance a dead zone in a fiber-optic gyroscope caused by the limited performance characteristics of the optical elements composing the fiber-optic gyroscope by identifying the direct optical elements with the distorted optical phase modulation characteristics, selecting the eligible direct optical elements through the identification, and controlling the output of the interference signals through pump LD driving current and the optical attenuator. Thus, the present invention can control the characteristics of an optical part for removing the dead zone. [Reference numerals] (11) Optical fiber light source; (12) Light coupler; (13) Direct optical element; (14) Optical fiber ring; (15) Detector; (16) Closed circuit controller
Abstract:
PURPOSE: A phase modulation stabilization method of a fiber optic gyroscope, using the error correction, is provided to accurately detect phase modulation amplitude errors. CONSTITUTION: A phase modulation stabilization method of a fiber optic gyroscope is as follows. The light, generated from a light source, adds a phase modulated signal to vary the phase on first and second phase sections(S100). The light is divided to toward in different ways in order to have the phase difference generated by the rotation of gyroscope(S200). The respective advanced light is united and the combined light is changed into optical signals(S410). First and second output mean values corresponding to the first and second phase sections, respectively are calculated from the light signals(S420). The phase modulated amplitude of the phase modulated signal is corrected by using the difference of the first and the second output mean value(S500).
Abstract:
본 발명은 비 공명 라만전이의 특성을 고려하여 라만 레이저의 상대 위상 잡음 및 진동에 의한 원자 간섭계의 위상 잡음을 정확히 추정하기 위한 원자 간섭계 및 그의 위상잡음 추정 방법에 관한 것으로, 라만 레이저 자체가 가지고 있는 상대 위상잡음 및 진동에 의해 라만 레이저의 상대 위상이 불규칙하게 변화하는 효과가 얼마만큼 원자 간섭계 출력 잡음에 영향을 주는지 분석하기 위해, 라만레이저 각 펄스별 비공명 특성을 반영한 원자간섭계의 수치 해석적 모델링 구현 및 구현된 간섭계 모델에 랜덤변수 생성을 통해 비공명 라만전이 상태에 대해서도 정확한 원자간섭계의 위상잡음을 추정할 수 있다.
Abstract:
PURPOSE: An interference signal output variance stabilization device of a fiber optic gyro and a method thereof are provided to reduce time and cost which are required to implement the fiber optic gyro. CONSTITUTION: An interference signal output variance stabilization device (701) of a fiber optic gyro comprises a standard offset voltage unit (703), amplitude gain controllers (702,705,707), integrators (704,706), and a peak detector (708). The standard offset voltage unit generates standard offset voltage which is set up as a center value of an analog/digital (A/D) converter. The amplitude gain controller sets up an amplitude gain so that the maximum value of interference signal output, which is generated by applying a modulating signal to an optical phase modulator (103) of the interference signal output variance stabilization device, does not exceed the maximum admissible input voltage of the A/D converter. The integrator is set up with a time constant to compare the DC offset voltage of the interference signal output with the standard offset voltage. The peak detector controls the amplitude gain of the amplitude gain controller by detecting the maximum value of the interference signal output and by comparing the maximum value of the interference signal output with the maximum admissible input voltage of the A/D converter. [Reference numerals] (S801) Start; (S802) Set up a direct current offset standard value as a center value of an analog/digital (A/D) converter; (S803) Set up an alternating amplitude gain so that the maximum value of interference signal output does not exceed the maximum admissible input voltage of the A/D converter; (S804) Set up the time constant of an integrator considering an alternating voltage frequency of the interference signal output and the time constant of a output stabilization circuit; (S805) Connect the maximum admissible input voltage of the A/D converter and the voltage of the interference signal output to a peak detector; (S806) Control the gain of the alternating voltage of the interference signal output by the output of the peak detector; (S807) End