TRANSMITTER-RECEIVER MODULE FOR GLASS FIBRE SENSORS

摘要

A transmitter-receiver module is disclosed for glass fibre sensors based on the measurement of chromatic alterations. Up to four glass fibre sensors (40a-d) can be connected to the module by the optical plug-connector (17). The module contains at the most four light sources (12a-d) for driving the sensors and up to three receivers (14a-c) provided with optical filters (15a-c) for spectrally analysing the signals of the glass fibre sensors. Each receiver is connected by a low-noise transimpedance amplifier (20a-c) to the AD converter (21). The module communicates with a control computer (60) via the parallel interface (25a-d). To avoid measurement errors due to wavelength drift, the light sources are connected by thermal vias (11) to the temperature-stabilising thermoelectric cooler (22).