An All Fibre Laser Low Cost "Rangefinder" For Small Vibration Measurements.

An all fibre interferometer device is presented which allows the measurement of speed to be made using an electronic processing system and is contrasted with the measurement of velocity through an optical processing technique which, however, is more complex and expensive to implement. The overall simplicity of the electronic technique, the low cost of components and the use of an all-fibre arrangement make this a convenient system to implement.