DEVICE MEASURING INTENSITY OF MAGNETIC FIELD Russian patent published in 2002 - IPC

FIELD: measurement technology. SUBSTANCE: device measuring intensity of magnetic field has first generator of rectangular pulses, first logic AND gate, pulse counter, digital-to- analog converter, first analog adder, controlled source of electric energy, first key and ferrosonde excitation winding connected in series, second generator of rectangular pulses, logic OR gate, first RS flip-flop connected with output to second input of first logic AND gate, second RS flip-flop which first input is connected to output and which output is connected to second input of second logic AND gate connected in series, generator of decaying pulses connected with second output to second input of first analog adder, first differentiating network connected with output to second input of logic OR gate, counting flip-flop, second differentiating network and third RS flip- flop connected with first output to second input of first key connected in series, ferrosonde output winding, amplifier, second key, first integrator, second analog adder which second input is connected to source of reference voltage, analog-to-digital converter, digital adder connected with second input to output of pulse counter and measuring instrument connected in series, third key connected with first input to output of amplifier and with second input to output of counting flip-flop, second integrator connected with output to second input of analog-to-digital converter, first threshold unit connected with first input to output of amplifier and with second input to first output of generator of decaying pulses and with output to second inputs of first and second RS flip-flops connected in series. Output of second generator of rectangular pulses is connected to second inputs of third RS flip-flop which is connected with second output to second input of second key, pulse counter, first and second integrators, second logic AND gate connected with first input to output of first generator of rectangular pulses and with output to input of generator of decaying pulses. Value ΔH of step of change of compensating field is chosen from condition , where H_c is coercive force of ferromagnetic material of core of ferrosonde. Core dimensions: width a, thickness b and length L are chosen from condition , where M_r is saturation magnetization of ferromagnetic material of core of ferrosonde. EFFECT: reduced methodical measurement error, enhanced sensitivity of device. 4 dwg