ENGINEERING APPLICATIONS

• Telecommunication• Long Distance Communication

• Handle large number of channels

• Signalling purposes

• Computer Networks• Connecting computers in a topology

• Connecting peripherals with computers

• Sophisticated multibeam radars – processing transmitted signals

• Cable Television• Replace copper wires with optical fibres

• Delay Lines• Microwave signal processing – no attenuation of signal

INDUSTRIAL & MEDICAL APPLICATIONS

• Endoscopes

• Pressure, temperature sensors

• Linking remote sensor and monitoring station

FIBRE OPTIC SENSORS

Optical sensor is a transducer which converts any form of a signal to an optical signal in the

measurable form.

Optical Source

Modulation Zone

Optical Detector

Transmitting Fibre

Receiving Fibre

TYPES OF SENSORS

• INTRINSIC or ACTIVE SENSORS• Physical parameter to be sensed acts directly on

the fibre to produce changes in the transmission characteristics

• Eg. Pressure and liquid level sensors

• EXTRINSIC or PASSIVE SENSORS• Separate sensing element is used and the optical

fibre is a waveguide.• Eg. Displacement and laser Doppler velocimeter

sensors