What are intrinsic and extrinsic fiber optic sensors?
Intrinsic sensors utilize a change that takes place within the fiber itself. This is in contrast to extrinsic sensors, in which the change is outside the fiber and the fiber itself remains unchanged. An example is a pressure sensor based on microbending of the fiber.
Which are intrinsic factors of fiber optic cable?
Internal fiber optic loss, also usually called intrinsic attenuation, is caused by the fiber optic cable itself. There are two causes of intrinsic attenuation. One is light absorption and the other one is scattering. Light absorption is a major reason of fiber optic loss during optical transmission.
What are the different types of fiber optics sensors?
The optical fibre sensors are divided into two categories: thrubeam and reflective. The thrubeam type comprises a transmitter and a receiver. The reflective type, which is a single unit, is available in 3 types: parallel, coaxial, and separate. The 3 are based on the shape of the crosssection of the optical fibre.
Which type of optical sensor is used for pressure measurement intrinsic or extrinsic?
Intrinsic Optical Sensor
| Extrinsic Optical Sensors | Intrinsic Optical Sensors |
|---|---|
| They are used in sensor applications such as temperature, pressure, liquid level, flow etc. | They are used in sensor applications such as rotation, acceleration, strain, acoustic pressure, vibration etc. |
What are intrinsic fiber optic sensors?
INTRINSIC FIBER OPTIC SENSORS: In such type of sensors, sensing takes. place within the fiber itself. These type of sensors have their dependency on the optical fiber properties itself to convert an environmental action into a modulation of the light beam passing through it.
What is extrinsic fiber optic sensor?
Extrinsic fiber-optic sensors use an optical fiber cable, normally a multimode one, to transmit modulated light from either a non-fiber optical sensor, or an electronic sensor connected to an optical transmitter. A major benefit of extrinsic sensors is their ability to reach places which are otherwise inaccessible.
What is intrinsic absorption in optical fibers?
Intrinsic Absorption is caused by basic fiber-material properties. If an optical fiber were absolutely pure, with no imperfections or impurities, then all absorption would be intrinsic. This kind of absorption determines the minimum level.
What is extrinsic absorption in optical fiber?
– Extrinsic absorption is caused by impurities introduced into the fiber material. Trace metal impurities, such as iron, nickel, and chromium, are introduced into the fiber during fabrication. Extrinsic absorption is caused by the electronic transition of these metal ions from one energy level to another.
What is the principle of a fiber optic sensor?
Fiber optic sensors work based on the principle that light from a laser or any superluminescent source is transmitted via an optical fiber, experiences changes in its parameters either in the optical fiber or fiber Bragg gratings and reaches a detector which measures these changes.
What is extrinsic fiber-optic sensor?
What is intrinsic Fibre optic sensor?