Phase Modulated FOS, Polarisation Modulated FOS

TL;DR

This video discusses two types of modulated fiber optic sensors - phase modulated and polarization modulated - and how they work.

Transcript

hello friends in this video we are going to talk about two more types of modulated fiber optic sensor and they are phase modulated fiber optic sensor and polarization modulated fiber optic sensor in which phase and polarization of the light signal is get changed and then it is compared with the reference signal to obtain the required result let's d... Read More

Key Insights

• 💿 Fiber optic sensors convert quantities into optical radiations using modulation techniques like intensity, phase, wavelength, and polarization modulation.
• ✋ Phase modulated fiber optic sensors provide high sensitivity and resolution, making them ideal for applications requiring precise measurements.
• 💿 Polarization modulated fiber optic sensors utilize changes in the refractive index and polarization of the fiber optic cable.
• 😁 In interferometers, phase modulated sensors change the phase of the exposed beam, while polarization modulated sensors compare the polarization states of transmitted and received signals.
• ✋ Phase modulated sensors are complex but offer high sensitivity and resolution.
• 🧑‍🏭 Polarization modulated sensors are influenced by factors like stress, strain, magnetic fields, and twisting of the fiber.
• 🔬 Both types of sensors find applications in electronics, science, engineering, and communication systems.

Questions & Answers

Q: What are the different types of modulated fiber optic sensors mentioned in the video?

The video discusses two types of modulated fiber optic sensors: phase modulated and polarization modulated sensors.

Q: How do phase modulated fiber optic sensors work?

Phase modulated sensors divide a light beam into two parts, with one exposed to the quantity under measurement, resulting in changes in phase. When compared with a reference beam, the phase difference causes changes in the output.

Q: What is the principle behind polarization modulated fiber optic sensors?

Polarization modulated sensors utilize changes in the refractive index and polarization of the fiber optic cable caused by stress, strain, or external factors like magnetic fields. The polarization states of the transmitted and received signals are compared, leading to variations in the output.

Q: What are the advantages of phase modulated fiber optic sensors over intensity modulated sensors?

Phase modulated sensors offer higher sensitivity and resolution compared to intensity modulated sensors, making them suitable for applications where higher sensitivity and resolution are requirements.

Summary & Key Takeaways

• Fiber optic sensors act as transducers converting various quantities into optical radiations, and modulation techniques like intensity, phase, wavelength, and polarization modulation are used.

• Phase modulated fiber optic sensors provide high sensitivity and resolution by changing the phase of the signal, while polarization modulated sensors compare the polarization state of the transmitted and received signals.

• In interferometers, phase modulated sensors undergo changes in phase, while polarization modulated sensors use the photoelastic effect to change the refractive index and polarization of the fiber optic cable.