AUTODINE MEASURING DEVICE FROM NOMINAL VALUE OF INTERNAL SIZES OF METALLIC ITEMS Russian patent published in 2017 - IPC G01B15/00 

FIELD: measuring equipment.

SUBSTANCE: meter contains an autodyne microwave generator connected to the autodyne signal isolation unit, a three-arm circulator, to the second arm of which is connected the first transceiver antenna whose radiation pattern is directed to the first local area of control of the inner surface of the product, and to the third arm is the second transceiver antenna, the radiation of which is directed to the second local area of control of the inner surface of the article opposite the first local area. Between the autonomous microwave oscillator and the first input of the three-arm circulator, a two-position phase shifter is introduced through the pass, and to the output of the autodyne signal isolation unit, the analog switch input is connected to two positions, to the first and second outputs of which the first and second band amplifiers are connected whose outputs are respectively associated with the first and second Amplitude detectors. In this case, the control inputs of the two-position phase shifter and the analog switch are connected to the output of the clock generator.

EFFECT: increasing the accuracy and sensitivity of measurements in conditions of differences in the quality of processing or wear on the inner surface of the monitored products, the appearance of dust or moisture on the path of propagation of microwave radiation, the effect of changes in ambient temperature and flicker fluctuations on the readings.

4 cl, 2 dwg