An optical-electronic measurement system for continuous monitoring of displacements and analysis of the friction pendulum bearings for the oil-drilling platforms is presented. Measuring principle of the system is based on target image formation by camera and digital image processing. The passive part of the system (optical target) is fixed on one part of construction while active part - a field measurement sensor (FMS) - is installed on another part of construction that moves relative to the first one. On the FMS output, after processing, the relative displacement between FMS and optical target is obtained with high degree of accuracy. The spatial resolution of a few micrometers can be achieved at cost of reduced measurement range.