Fiber Bragg Grating Principle, FBG Sensor Principle, FBG Temperature, Force, Strain Principle

Summary

In this presentation, Ivan from Beijing Dang Yong Xang Technology Company Limited discusses fiber Bragg grating (FBG) sensing technology, explaining its fundamental principles and applications. FBGs consist of periodic stripes inscribed onto optical fibers, allowing them to measure temperature, strain, and stress through wavelength changes in reflected light. The video highlights the delicate nature of these sensors and the innovative methods developed by the company to enhance their protection and functionality, including a range of unique temperature and strain sensors. Ivan invites collaboration to advance the industry further.

Takeaways

• 😀 Fiber Bragg grading sensors utilize a series of periodic stripes to manipulate light through refraction or reflection.
• 🔍 These sensors can measure three fundamental physical quantities: temperature, strain, and stress.
• 🌡️ The wavelength of reflected light in fiber Bragg gratings is determined by the grading pitch, or the distance between reflection surfaces.
• 🔧 Various manufacturing methods exist for creating fiber Bragg gratings, including ultraviolet light exposure and direct writing with focused lasers.
• 🌍 External factors like force and temperature changes can affect the grading pitch and, consequently, the sensor readings.
• 📏 When tension is applied to a fiber Bragg grating, it elongates, while pressure causes it to shorten.
• 🔥 Temperature increases cause the fiber to expand, leading to an increase in grading pitch, whereas cooling results in contraction.
• 🏭 Beijing Dang Yong Xang Technology Company creatively combines modern metallurgical techniques with traditional fiber grading technology.
• 🚀 The company offers a range of sensors, including temperature, strain, displacement, and stress sensors, each with unique features.
• 🤝 The presentation emphasizes the importance of collaboration in advancing the fiber Bragg grading sensor industry.

Q & A

What is a fiber Bragg grating (FBG)?

A fiber Bragg grating is an optical fiber that has periodic stripes inscribed onto it, which allows it to reflect specific wavelengths of light while transmitting others.

How are fiber Bragg gratings manufactured?

FBGs are manufactured using methods such as ultraviolet light exposure and direct writing with femtosecond lasers to create numerous weak reflection surfaces along the fiber.

What physical quantities can fiber Bragg gratings measure?

FBGs can measure three fundamental physical quantities: temperature, strain, and stress.

What determines the wavelength of reflected light in an FBG?

The wavelength of the reflected light is determined by the distance between two weak reflection surfaces, known as the grading pitch.

How does tension affect the grading pitch of an FBG?

When tension is applied to a fiber Bragg grating, it stretches, which increases the grading pitch and consequently changes the wavelength of the reflected light.

What happens to an FBG when it is heated?

When an FBG is heated, it expands, which also increases the grading pitch and alters the reflected wavelength.

What unique products does Beijing Dang Yong Xang Technology Company offer?

The company offers a range of distinctive products, including FBG temperature sensors, strain sensors, displacement sensors, and stress sensors.

What challenges do fiber Bragg gratings face in application?

FBGs are delicate and the fibers that support them are fragile, necessitating various protective measures during their application.

What is the significance of the sharp peak in the reflected light graph?

The sharp peak in the reflected light graph indicates a specific wavelength where constructive interference occurs, resulting from the combined reflection from numerous weak reflection surfaces.

How does the presentation aim to enhance understanding of FBG technology?

The presentation provides foundational knowledge about the principles of fiber Bragg gratings, their applications in sensing, and the innovative approaches taken by the company to develop unique sensor products.