servodispositivo and in particular system involving sensitive transducers, and influenced by the fall king cold light or other conditions to measure or control

摘要

A servo device which has but a single movable part that is essentially frictionless and which thus eliminates the usual gears and instead utilizes a galvanometer-type movement in a servo feedback loop arrangement. The galvanometer is associated with a bridge circuit and a novel light-cell control which is actuated by the galvanometer. The novel control comprises a movable element adapted to modify a light beam which is produced for the purpose of striking the light cell disposed in one bridge leg, and which originates at an electric lamp. Another leg of the bridge includes a condition-responsive element responding to heat, cold or other conditions in a manner to unbalance the bridge, the balance of which is then re-established by deflection of the galvanometer to activate the light control so as to modify the influence of the light cell (in the one bridge leg). The position of the movable element or coil of the galvanometer can be an indication of the magnitude of the cold, heat or other condition which is being monitored. The device can function as a position transducer for angular or linear values, as a basic function generator, including an electrical as well as mechanical output. By virtue of the single moving part there is had a desirable simplicity and reduced cost, with lower maintenance expense while at the same time accuracy is not sacrificed.