Georg Weidinger

Loss-compensated photoelastic fiber optic pressure sensor

A fiber optic pressure sensor based on the photoelastic effect has been set up in a four-port polariscope. The down lead insensitivity is achieved by application of the balanced bridge referencing technique. The sensor has an excellent insensitivity to source intensity fluctuations as well as mode dependent and mode independent changes in the damping of the down leads. The sensor exhibits a linearity of +/-0.1% and a temperature stability of +/-1% within a range of 0-60 degrees C with respeat to a span of 6 bar.

Improvements Of The Data Link Dependencies Of Fiber Optic Sensor

The precision of intensity modulated fiber optic sensor systems mainly is restricted by the damping characteristics of the analog fiber optical data link. Special encoding and referencing schemes are used to overcome this data link dependence. In this paper encoding and referencing principles for optical sensors are outlined and compared. Especially the two wavelengths referencing and the optical delay line processing techniques are discussed in more detail and results are presented.

Improvements of the data link dependencies of fiber optic sensor systems

Abstract The precision of intensity modulated fiber optic sensor systems mainly is restricted by the attenuation characteristics of the analog fiber optical data link. Special encoding and referencing schemes are used to overcome this data link dependence. In this paper encoding and referencing principles for optical sensors are outlined and compared. Especially the two wavelengths referencing and the optical delay line processing techniques are discussed in more detail and results are presented.