An examination is made of the basic types of measuring and monitoring
instruments utilizing externally modulated fiber-optic sensors with bu
ilt-in microprocessors, making it possible to achieve a considerable i
mprovement in their metrological characteristics and also to lower the
apparatus costs and reduce the overall dimensions and power consumpti
on. The basic algorithm for the functioning of these instruments are p
resented and the circuitry required for implementing them is considere
d.