Application of PM fiber coil in inertial navigation system and its relationship with fiber optic gyroscope

What is an Inertial Navigation System?

An Inertial Navigation System (INS) is a highly autonomous navigation technology that determines the position and orientation of an object through internal measurement devices without relying on external signals or reference points. In this system, fiber optic gyroscopes (FOGs) and PM fiber coils are key technologies that together provide the required accuracy to ensure the performance of the system.

Composition of Inertial Navigation System

Inertial Navigation System Composition, Importance, and Application Scenarios

Inertial navigation systems consist of accelerometers and gyroscopes, which measure the linear acceleration and angular velocity of an object. These measurements are used to calculate the change in position and orientation of an object over time. A key advantage of INS is that it does not rely on external signals, which means it is not affected by signal interference or blocking, which is critical in many applications, such as deep-sea navigation or space flight.

Integration of PM fiber coils and fiber optic gyroscopes

To achieve the highest navigation accuracy, polarization-maintaining fiber coils and fiber optic gyroscopes must be precisely integrated into the INS. This includes ensuring that all components are operating at the correct temperature and pressure, and using high-precision electronics to read and interpret the output of the sensors. In addition, the software in the system must also be optimized to accurately process the data from the various sensors and calculate precise navigation information from them.

How Fiber Optic Gyroscopes Work?

.Angular velocity detection: As the fiber optic gyroscope rotates, the two beams of light transmitted through the PM fiber coil experience different phase changes. By comparing these changes, the system can accurately calculate the angular velocity.

.Improving signal clarity: By maintaining stable light polarization, PM fiber reduces light scattering and beam splitting, which helps maintain signal clarity and provides more accurate readings.

.Reducing environmental interference: Because PM fiber is insensitive to changes in temperature and vibration, it can reduce the impact of external environmental changes on the performance of the fiber optic gyroscope.

Unique construction of PM fiber coil

The core of PM fiber coil technology is that it can greatly reduce the impact of environmental factors on the performance of fiber optic gyroscopes. This is due to its unique skeleton design and four-level symmetrical fiber winding technology, which are designed to minimize the adverse effects caused by temperature changes and mechanical stress, namely the famous Shupe effect.

Unique skeleton design

The skeleton design of the PM fiber coil is excellent and can adapt to various types of polarization-maintaining fibers. This flexibility ensures that the fiber ring can be customized according to specific application requirements, thereby providing optimal performance in a variety of different environmental conditions and application scenarios.

Four-level symmetrical fiber winding technology

The four-level symmetrical fiber winding technology is a specialized fiber winding method designed to minimize stress and temperature gradients in the optical fiber. With this method, the fiber ring can maintain a high degree of stability and reliability under various temperature and mechanical stress conditions.

Selection of winding method, adhesive and optical fiber

The performance of PM fiber coil depends not only on their basic structure, but also on the winding method, adhesive material, and fiber type. These factors collectively determine the final quality and efficiency of the fiber optic coil.

Effect of winding method

Different winding methods directly affect the geometric parameters of the fiber coil, including fiber length, aspect ratio, and total height. These parameters are critical to the performance and applicability of the fiber coil. Therefore, it is very important to choose the right winding method to meet specific application requirements.

Importance of adhesive

The adhesive plays a key role in the manufacturing process of PM fiber coil. It not only affects the physical and thermodynamic properties of the fiber coil, but also affects the geometric parameters of the fiber coil. Choosing the right adhesive material and the right curing technology are essential to manufacturing high-performance fiber coils.

Type of optical fiber

The choice of optical fiber is also an important consideration. Different types of optical fibers (such as Panda-type PM fiber, photonic crystal fiber, etc.) have different physical and chemical properties that affect the performance of the fiber coil. Therefore, it is very important to choose the right type of optical fiber according to specific application requirements.

The fiber optic coil is one of the five optical devices of the fiber optic gyroscope and is the core sensitive device of the fiber optic gyroscope. Its performance plays a decisive role in the static accuracy, full-temperature accuracy, and vibration characteristics of the gyroscope.

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