VIBRATION MAGNETIC METER Russian patent published in 2008 - IPC G01R33/02 

FIELD: measuring techniques.

SUBSTANCE: proposed vibration magnetic meter comprises an electrodynamic vibration generator with a supply coil, rigidly joined by a rod to a sample holder, as well as a constant magnetic field source, power supply source, coils for controlling amplitude of vibration, magnetising field source, powered by the first regulated current source, a heater, powered by the second regulated current source, magnetic field and temperature sensors, measuring system, comprising measuring coils, first amplifier, synchronous detector and a first low-pass filter. The vibration magnetic meter also has a recoding device and a thermostat. The measuring coils are connected to the input of the first amplifier, the output of which is connected to the first input of the synchronous detector, whose output is connected to the input of the first low-pass filter. The outputs of the recording device are connected to the magnetic and temperature sensors and the output of the first low-pass filter. The coils for controlling amplitude of vibration and the constant magnetic source are inside an electromagnetic screen. Inside the screen there is an electronic unit, comprising a second amplifier, amplitude detector, second low-pass filter, integrator, d.c voltage source and a pulse generator. The power supply source comprises a quartz oscillator, frequency divider, code converter, a digital-to-analogue converter and a third amplifier. The output of the quartz oscillator is connected to the input of the frequency divider, the outputs of which are connected to inputs of the code converter, whose outputs are connected to digital inputs of the digital-to-analogue converter, the output of which is connected to the input of the third amplifier. The output of the third amplifier is connected to the supply coil. The coil for controlling vibration amplitude is connected to the input of the second amplifier, the first output of which is connected to the input of the amplitude detector, whose output is connected to the input of the second low-pass filter. The output of the low-pass filter is connected to the first input of the integrator. The second input of the integrator is connected to the output of the d.c voltage source. The output of the integrator is connected to the input of the reference voltage of the digital-to-analogue converter. The second output of the second amplifier is connected to the input of the pulse generator, the output of which is connected to the second input of the synchronous detector.

EFFECT: increased accuracy of measurements, reduced errors.

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