The **FTG-55-R** is a high-performance **Fiber Optic Gyroscope (FOG)** designed for tactical-grade navigation and stabilization applications. It is manufactured by companies specializing in inertial sensors (such as Fizoptika). --- ## 1. Technical Specifications The following table highlights the core electronic and performance parameters of the FTG-55-R: | Parameter | Specification | Units | | :--- | :--- | :--- | | **Technology** | Fiber Optic (Open Loop) | - | | **Output Type** | Analog (Differential) | - | | **Input Voltage** | +5V (Fixed) | VDC | | **Power Consumption** | < 1.0 | W | | **Bias Stability** | 1.0 - 5.0 | °/hr | | **Scale Factor** | ~10 - 15 | mV/(°/s) | | **Bandwidth** | Up to 1000 | Hz | --- ## 2. Core Electronic Components The device is an integrated opto-electronic system consisting of three primary segments: ### A. The Optical Block * **SLD (Superluminescent Diode):** The light source that emits broadband light into the fiber. * **Fiber Coil:** A high-precision spool of polarization-maintaining (PM) fiber that acts as the sensing element via the Sagnac Effect. * **Coupler/Splitter:** Splits the light beam to travel in clockwise and counter-clockwise directions. ### B. Signal Processing Circuitry * **Preamplifier:** Since the output of the photodetector is extremely small, a low-noise transimpedance amplifier (TIA) is used to convert current to voltage. * **Synchronous Demodulator:** Extracting the phase shift information from the interference pattern to determine the angular rate. * **Filtering:** Low-pass filters are used to remove high-frequency noise from the analog output. ### C. Power Management * **Voltage Regulators:** The unit typically requires a stable +5V supply. Internal regulation ensures that fluctuations in the power source do not translate into bias drift. --- ## 3. Operational Mechanism The FTG-55-R operates based on the **Sagnac Effect**. 1. Light is split into two beams traversing a fiber coil in opposite directions. 2. When the unit rotates, one beam travels a slightly longer path than the other. 3. The resulting phase shift is detected by a photodiode. 4. The electronics convert this phase shift into a linear **Analog Voltage** proportional to the angular velocity. --- ## 4. Key Advantages * **No Moving Parts:** Unlike mechanical gyros, there is no wear and tear, leading to an extremely high MTBF (Mean Time Between Failure). * **Immunity to EMI:** Because the sensing element is glass fiber, it is highly resistant to electromagnetic interference. * **High Bandwidth:** Suitable for high-speed stabilization of cameras, antennas, or UAVs.