METHOD TO DEFINE LEVEL AND OTHER PARAMETERS OF FRACTIONATED FLUID AND MAGNETOSTRICTION LEVEL GAUGE FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC G01F23/28 

FIELD: instrumentation.

SUBSTANCE: method implies formation and delivery of coded electric pulses of specified duration. Afterwards the formed electric pulses are converted into ultrasonic vibrations in an acoustic line by the deformation of the acoustic line, by forming an alternating magnetic flux in an excitation coil winding. The magnetic flux is produced by delivering the formed electric pulses of specified duration to the excitation coil winding by exposing the constant magnetic field to the action of alternating magnetic flux passing through the section of the excitation coil winding and changing the resultant of the magnetic field. Ultrasonic vibrations are converted into electric oscillations by the deformation of a ferroelectric crystal of a piezoelectric receiver under the action of ultrasonic vibrations. Time interval for ultrasonic vibrations passage through the fluid is calculated. The fluid level is defined basing on the known sound speed in the acoustic line and the calculated time interval. The calculated time interval for ultrasonic vibration passage is considered as the sum of a priori measured correction adding value defined by the measured distance from the independent instrumentation module fixed in the known point to the vessel bottom, of the time between the ultrasonic vibration passage from a float to the lower end of the acoustic line, the time of ultrasonic vibration passage from the independent instrumentation module fixed in the known point to the lower end of the acoustic line shall be deducted from the above. The coded signal at the piezoelectric receiver output also contains the data on the fluid parameters and individual number of the measurement point. A magnetostriction level gauge comprises a sensor with a magnetostriction acoustic line put in a magnet permeable pipe, an independent instrumentation module fixed at the known distance from the vessel bottom, a piezoelectric receiver, a unit to calculate the time of ultrasonic vibration passage from the fluid surface (fraction splitting border) to the vessel bottom, at least one float; in the floats there installed are active independent modules with measuring circuits controlled by microprocessors and excitation coils of the acoustic line and magnet units of n constant magnets (annular magnets with radially oriented magnet field), where n =1, 2…i, installed around the pipe and able of moving along it.

EFFECT: improved accuracy of level measurement, compensation of error caused by temperature coefficient of acoustic line expansion, enhanced functionality due to provision for measurement of additional parameters of fluid fractions.

4 cl, 3 dwg