CARRIER FREQUENCY MEASURING TRANSDUCER Russian patent published in 2023 - IPC G01B7/16 G01D5/00 

FIELD: measuring transducer.

SUBSTANCE: measuring transducer at the carrier frequency contains: a measuring bridge that sets the generator of a sinusoidal voltage of the carrier frequency, a power amplifier of the measuring bridge supply voltage with a sinusoidal voltage, a sinusoidal voltage converter into a rectangular one, a switch for the level of the measuring bridge supply voltage, a device for selecting the converter operation mode, a preamplifier of the carrier frequency, summing amplifier, synchronous detector of the measured signal, low-pass filter with a software-controlled cut-off frequency, DC voltage amplifier with a software-controlled gain, buffer precision amplifier, analogue-to-digital converter, static calibration device for the measuring channel, phase-ohmic balancing device for the measuring channel converter before the experiment, a device for generating the reference voltage of an analogue-to-digital converter, a device for automatic compensation of capacitive unbalance of the measuring channel during the experiment, a transducer dynamic calibration device. The microcontroller controls the device for selecting the operating mode of the converter, the synchronous detector of the measured signal, the low-pass filter, the DC voltage amplifier, the analogue-to-digital converter, the static calibration device, the device for phase-ohmic balancing before the experiment, the device for automatically compensating the capacitive unbalance of the measuring channel, the device for generating the reference voltage ADC, the transducer dynamic calibration device.

EFFECT: increase in the accuracy of measuring static and dynamic signals, as well as a reduction in the complexity of balancing and dynamic calibration of the measuring transducer.

1 cl, 1 dwg