922936 Solartron Metrology LVDT

Miniature ac Energised Inductive Displacement Transducer_x000D_ When the primary winding is connected to an AC supply, current starts to flow in the secondary coils. The secondary coils are connected in series opposition so that two voltages have opposite phase so when the core is in the centre position then voltages of equal magnitude but opposite phase will be induced in each secondary coil and the output is zero. As the core is moved in one direction the voltage in the corresponding secondary coil increases while the other coil experiences a complementary voltage reduction. The effect is a transducer voltage output that is proportional to displacement. Knowledge of the magnitude and the phase of the output with respect to the excitation signal allows one to deduce the position and direction of the core motion from the null position._x000D_ Low cost solutions to displacement measurement_x000D_ Friction free operation with reduced guidance accuracy_x000D_ Stainless steel body and push rod_x000D_ _x000D_ Linear Variable Differential Transformers (LVDT)_x000D_ These devices comprise a movable nickel iron core and three coils - one for energisation and two for pick-up. They need to be driven by a sine wave to produce an output amplitude and phase directly proportional to the position of the core with respect to the pick-up coils. A phase sensitive detector is required to demodulate the output signal. The main advantages of LVDTs are;_x000D_ No wear problems as with potentiometers_x000D_ Infinite resolution, high accuracy and linearity_x000D_ No friction introduced into the measured system_x000D_ Available in ranges from ±1mm to ±50mm_x000D_ Note_x000D_ RS LVDT's datasheet Stock No. 232-4049 is available on request.