METHOD TO DETECT LIQUID LEVEL WITH MAGNETOSTRICTIVE LEVEL INSTRUMENT AND MAGNETOSTRICTIVE LEVEL INSTRUMENT Russian patent published in 2014 - IPC G01F23/28 

FIELD: instrumentation.

SUBSTANCE: invention relates to equipment for monitoring and detection of liquid levels, preferably in reservoirs. In the method for detection of liquid level with a magnetostrictive level instrument they measure temperature of the end of an acoustic line submerged into liquid, with account of the measured temperature they detect sound speed in the acoustic line, they measure the second interval of time from the moment of pulse supply to the winding of the excitation coil to the moment of generation of direct electric oscillations at a piezoelectric hydrophone, and they detect the distance from the end of the level instrument acoustic line to the level of liquid by difference of the second interval of time from the moment of pulse supply to the winding of the excitation coil to the moment of generation of electric oscillations on the piezoelectric hydrophone reflected from the end of wire, and the first interval of time. Besides, they determine as the reference the first and second intervals of time with absence of noise, and all measurements with available noise that do not meet the reference sum are rejected. Into the magnetostrictive level instrument, comprising a sensitive element with an acoustic line from magnetostrictive material placed into a dielectric tube, a winding wound onto the dielectric tube, a system of floats with magnets, placed around an insulating shell with the possibility of movement along it, a generator of electric pulse, a unit of level detection, a generator of electric pulse, connected to the winding, a piezoelectric hydrophone and a shaper of digital pulse from converted electric oscillations from the piezoelectric hydrophone connected with the piezoelectric hydrophone via an amplifier of converted electric oscillations from the piezoelectric hydrophone, a unit of detection of time interval between the moment of time of generation of Villard effect and the moment of time of generation of piezoelectric effect, inputs of which are connected accordingly with the electric pulse generator and shaper of digital pulse from converted electric oscillations from the piezoelectric hydrophone, and the outlet - with the second inlet of the level detection unit, in contrast with the available one, there is a temperature sensor introduced, being installed at the end of the acoustic line submerged into liquid, and connected to the unit of level detection.

EFFECT: reduced error of liquid level measurement.

2 cl, 4 dwg