Shenzhen FOVA Technology Co.,Ltd Company News

Analysis of fiber optic gyroscope core indicators   1. Zero Bias and Zero Bias Stability   Definition and meaning   Zero Bias: The output equivalent angular velocity of the gyroscope when the input angular velocity is zero, which ideally corresponds to the earth's rotation component. Zero Bias Stability: the degree of dispersion of zero bias (expressed as standard deviation), which is the core index of accuracy, and strategic products can reach 0.001°/h (1σ).   Influencing factors and optimization   Temperature perturbation: ambient temperature changes lead to non-reciprocal phase shift of the fiber optic coils, which needs to be suppressed by temperature control or compensation algorithms (drift ≤ 0.1°/h in the whole temperature zone). Polarization noise: polarization-preserving optical fiber and polarization filtering technology are adopted to reduce the impact of polarization fluctuation on zero bias.     2.Scale factor and nonlinear error   Key parameters   Scale factor: the ratio of output and input angular rate, reflecting the sensitivity, the nonlinear error of navigation grade products is ≤50ppm (full scale 300°/s). Stability: affected by temperature and polarization state changes, linear fitting accuracy needs to be verified by dynamic angular velocity input.   Dynamic performance verification   High-speed response test: within the range of input angular velocity 0.1~1000°/s, the response time is ≤1ms, and the deviation of tracking accuracy is ≤±0.5%.   3．the random wandering coefficient and noise characteristics   Noise index classification   Angular Random Wander (ARW): reflecting angular velocity white noise, ≤0.0005°/√h for strategic grade products. Rate noise density: noise power per unit bandwidth, and ARW there is a conversion relationship (typical value ≤ 0.001°/sec/√Hz).   Noise source   Photon spontaneous radiation, detector circuit noise, mechanical vibration, etc., need to combine digital filtering and anti-vibration design to reduce the impact.   4.Dynamic range and sensitivity   Threshold and resolution   Threshold: minimum detectable angular velocity (strategic level ≤ 0.0001°/h). Resolution: Measurement of incremental sensitivity, directly related to the noise level.   Maximum input angular velocity   Typical dynamic range ±1500°/s, supports high-speed vehicle maneuvers and instantaneous angular velocity capture.   5. Environmental Adaptability   Temperature domain and vibration resistance   Operating temperature: -40°C to +85°C (military grade standard), zero bias change ≤ 0.1°/h after temperature drift compensation. Vibration resistance: output fluctuation ≤0.03°/s under axial 3g RMS vibration (10Hz~2000Hz).   Electromagnetic compatibility   Shielded package and anti-jamming circuit design is adopted to maintain stable output under 100kV/m field strength.   6.Typical Performance Classification Comparison Performance level Zero-bias stability (°/h) Random wandering coefficient (°/√h) Application scenario Tactical grade ≤0.01 ≤0.01 UAV navigation Navigation grade ≤0.001 ≤0.001 Submarine inertial guidance Strategic level ≤0.0001 ≤0.0005 ICBM guidance   7.Error compensation technology All-digital closed-loop control Based on FPGA+ASIC architecture, real-time correction of optical path nonlinear error to improve zero-bias stability and dynamic response. Multi-sensor fusion Integration of temperature and vibration sensors, real-time compensation of environmental disturbances through Kalman filtering (integrated error ≤ 0.0015°/h). Testing and verification standards Allan ANOVA: Used to quantify the zero-bias stability and random wandering coefficient. Dynamic calibration: Combined with the high-precision rotary table to simulate the actual working conditions, to verify the scale factor error and tracking accuracy.   Through the optimization and verification of the above core indexes, the fiber optic gyroscope has achieved technological breakthroughs in the fields of high-precision navigation, strategic weapons guidance, etc., and gradually replaced the traditional mechanical gyroscope.

Analysis of high-precision fiber optic gyroscope technology solutions   1. Core Technology Architecture   Sagnac effect and phase difference detection Fiber optic gyroscope is based on the Sagnac effect, through the measurement of angular motion triggered by the phase difference between the two beams of reverse propagation of light to achieve angular velocity detection, the sensitivity can be up to micro-arc degree level. The core optical path adopts a bias-preserving fiber ring resonant cavity design, which reduces the polarization error to 0.0001°/h scale.   Full digital closed-loop signal processing Adopting all-digital closed-loop control technology (e.g., FPGA+ASIC architecture) to compensate for the nonlinear error in the optical path in real time, improve the dynamic response speed to more than 10kHz, and support the instantaneous angular velocity capture in high-speed rotating scenes.   Erbium-doped fiber light source optimization Erbium-doped fiber ultra-fluorescent light source technology to achieve broad-spectrum low-noise output (wavelength stability

Laser distance measurement module core technology in the industrial and military field of application analysis   I. Industrial applications   Automated production and precision inspection   Phase-type ranging technology (accuracy of millimeters) is used for real-time monitoring of body dimensions in automobile manufacturing to ensure the consistency of stamping, welding and other aspects of the process. Pulsed long-range modules (e.g. 5km range) are used for deformation detection of large containers and monitoring of material stacking height in production lines, supporting non-contact dynamic measurement. Robot navigation relies on laser ranging modules to provide three-dimensional spatial positioning data to realize precise gripping and assembly of robotic arms, with error control within ±1mm.   Construction and Engineering Monitoring   Phase laser modules (B series 150m ranging) are used for deformation monitoring of large structures such as bridges and tunnels, with millimeter-level accuracy capturing 0.1mm displacement changes. Integrated modules combined with AI algorithms (e.g. ZK Sculling Boat's “Light + AI” solution) can detect defects on building surfaces with an identification accuracy of 2.5 pixels (equivalent to locating the tip of an embroidery needle on a soccer field).   Environmental Adaptability Challenges   In industrial scenarios, the module needs to withstand dust, oil and vibration interference. The new generation of products is optimized with sealed optical cavity and anti-interference algorithms to ensure stable operation under -20℃ to +60℃ environment. Second, military applications   Target reconnaissance and guidance   Pulsed laser ranging module (e.g. 1535nm wavelength) can accurately locate enemy targets 5km away with an error of ≤0.5m, and support missile end-to-end guidance and ballistic correction. Satellite laser ranging technology (precision micro-radian level) for Earth-Moon space target tracking, support 380,000 kilometers of ultra-long-distance measurement and control.   2.Defense and Strike Systems   Radar-laser fusion system (e.g. X-band radar + laser rangefinder) can track 200 targets, with positioning accuracy of 0.2m for 0.5cm-level micro UAVs, and with 8000W high-energy laser to achieve 0.3-second melting of aluminum alloy structures. Multi-level response mechanism combined with dynamic trajectory prediction algorithm, the trajectory prediction error of 20m/s high-speed target is

Fiber optic gyroscope principle of operation in detail   First, the core principle: based on the Sagnac effect (Sagnac effect)   Relationship between optical range difference and angular velocity Fiber optic gyroscope through the detection of the same closed optical path in the reverse propagation of the phase difference between the two beams of light to deduce the angular velocity.   When an optical fiber rotates around a coil with a carrier, the beam propagating in the direction of rotation undergoes a longer optical path than the beam propagating in the opposite direction, resulting in an optical range difference; The optical range difference is proportional to the rotational angular velocity, and the angular velocity can be calculated by measuring the phase difference or the change of interference fringes.     Second, the key structure and workflow   Component Composition   Fiber optic coil: the core component, usually made of hundreds to thousands of meters of fiber optic winding, used to form a closed optical path; Light source and detector: the laser light source emits light signals, and the detector captures the change of light intensity after interference; Signal processing module: converts the phase difference into an electrical signal and outputs angular velocity data.   Working steps   The laser beam is divided into two beams by the beam splitter and propagates clockwise and counterclockwise along the fiber optic coil; The optical signals converge and interfere at the detector, and the rotation causes the phase difference to change; The angular velocity of the carrier is inverted by detecting the change in interference intensity.   Third. Technology Classification and Advantages Technology evolution   The fourth generation of optical gyro: compared with mechanical gyro and laser gyro, fiber optic gyro has no moving parts, strong shock resistance and longer life; High-precision type: navigation-grade fiber optic gyro achieves zero-bias stability better than 0.001°/h, suitable for spacecraft and precision guidance.   Unique advantages   High sensitivity: tiny angular velocity can be measured (e.g. the earth's rotation rate of 15°/h); Environmental adaptability: high temperature resistance, anti-electromagnetic interference, suitable for extreme conditions; Compact structure: miniaturized design is suitable for UAVs, robots and other miniaturized equipment.   Fourth:Typical applications Military field: missile guidance, tank scope stabilization system; Civilian field: UAV attitude control, high-speed train navigation, bridge health monitoring; Aerospace: satellite attitude adjustment, spacecraft inertial navigation.   Through the above principle and structural design, the fiber optic gyroscope realizes high-precision and low-drift angular velocity measurement, and becomes one of the core components of the inertial navigation system.   Translated with DeepL.com (free version)    

April 14, 2024, Shenzhen International Sensor and Application Technology Exhibition, in Shenzhen Convention and Exhibition Center (Futian) grand opening! From April 14 to 16, the exhibition will last for three days. As a grand gathering of the Sensor industry chain, Sensor Shenzhen will gather more than 100 core figures of international sensor giants, more than 1,000 leaders of domestic sensor enterprises, more than 600 global sensor industry chain enterprises, and 20+ key technology exhibition areas. 20+ professional technology application forums, focusing on the development of new momentum in the field of perception, new formats, attracting more than 20,000 professional visitors.