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Laboratory Evaluation of the Standard Elektrik Lorenz (SEL) Fibre-Optic Rate Gyroscope
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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A fibre-optic rate-sensing gyroscope FOG manufactured by Standard Elektrick Lorenz SEL was loaned to DREO for evaluation. The SEL FOG, model PMIDE, was designed for a drift rate of 10 to 100 deghr and consists of two units a fibre-optic sensor and a support electronics unit. Laboratory tests were carried out in the DREO Inertial Navigation Laboratory and consisted of bias drift and scale factor over 400 degsec as well as temperature sensitivity. Performance data obtained by DREO agreed closely with predicted performance although bias drift demonstrated wide deviations under thermal rate- transients. A permanent shift in bias drift and scale factor also occurred after extended testing at 50 deg C. A bias drift of 5.38 deghr - 0.68 deghr was achieved at 30 deg C and scale factor deviation was approximately 13,000 ppm over a rate range of 400 degsec. This instrument would be suitable for a low- performance Attitude and Heading Reference System AHRS application. Fibre- optic gyroscope, FOG, Rate sensor.
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