QUICK-ACTING DEVICE FOR MEASUREMENT OF MAGNETIC FIELD STRENGTH Russian patent published in 2000 - IPC

FIELD: magnetic measurements. SUBSTANCE: quick-acting device for measurement of magnetic field strength has the first square-wave generator, ferroprobe with a core made of permalloy with a hysteresis loop with a squareness ratio close to unity. Connected to the ferroprobe output winding is an integrator, whose output is connected to the input of the first threshold unit, series-connected AND gate, pulse counter, digital-to analog converter, controlled current source, key and ferroprobe exciting winding. The first input of the AND gate is connected to the output of the first square-wave generator. Novelty in the invention is provision of RS-flip-flop, second square-wave generator and threshold unit. The output of the second square-wave generator is connected to the first input of the RS-flip-flop and second input of the pulse counter, the output of the first threshold unit is connected to the second input of the RS-flip-flop, the output of the RS-flip-flop is connected to the second inputs of the key and AND gate, the input of the second threshold unit is connected to the ferroprobe output winding, and the output - to the third input of the AND gate. EFFECT: enhanced speed of response due to attaining of the value of compensating field with the aid of one pulse whose duration is commensurable with t_i. 2 dwg