Fiber Optic Gyro for Virtual Reality Applications

Fiber optic gyro for virtual reality applicationsOverviewThis document specifies the requirements and methods for use and maintenance of F98B fiber optic gyroscope (product for short).Product introductionWorking principle, function and scope of application of the productHow it worksThis product is an inertial angular rate sensor based on the optical Sagnac effect, which is used to measure the angular rate of the carrier along the sensitive axis of the product. An angular rate sensing unit of the product is an optical fiber ring, a digital closed-loop detection circuit is used for extracting the optical path difference of clockwise and counterclockwise propagation light caused by external physical angular rate and sensed by the optical fiber ring, and meanwhile, the optical path difference signal is converted into a voltage signal for closed-loop feedback and control, so that the modulation and demodulation of the signal are realized, and the purpose of high-precision angular rate signal detection is achieved.FunctionThis product is composed of an optical angular velocity sensing unit and a signal detection unit, providing single-axis angular increment information and internal temperature information.Scope of applicationThe products are mainly suitable for high-precision inertial navigation systems, positioning and orientation systems and other applications.CompositionThe main components of the product are as follows:The optical path unit comprise a light source, an optical fiber re, an integrated optical phase modulator, an optical fiber coupler and an optical detector;The circuit unit comprises a light source driving circuit and a detection and control signal circuit board;Gyroscope structural parts.Appearance and installation dimensionOverall dimension (mm): (98 ± 0.1) × (98 ± 0.1) × (35 ± 0.1) (L × W × H);Installation dimension (mm): (80 ± 0.1) × (80 ± 0.1) (L × W), Φ5.4mm × 4, such as belowMain performanceparameters See the main performance parameters of the product for details.Table 1 Main performance parameters  No.Test itemUnitTechnical requirements1Overall dimensionsmm98×98×352Start timemin≤33Zero bias stability(10 s smoothing, 1σ)º/h≤0.024Zero-bias repeatabilityº/h≤0.025Random walk coefficientº/h1/2≤0.0016Scale factor nonlinearityppm≤207Scale factor repeatabilityppm≤208Operating temperatureºC-40~+609Storage temperatureºC-50~+7010Dynamic range(°)/s±30011Supply voltageV+5V12Steady-state power consumptionW1.5AElectrical connection interfacePoint numberDefinitionComment1,9+5VPower supply input2,10GNDPower ground5RXD+Gyro differential sorting and correcting13RXD-Gyro differential gating negative6TXD+Gyro differential output positive14TXD+Gyro differential output negative3,4,7,8,11,12,15--Reserved        /* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1