HIGH ACCURACY LEVEL TRANSDUCER

摘要

A level transducer has a power supply module, a tuning fork module, a sensing-phase corrector and a controller. The tuning fork module has a tuning fork, at least one piezoelectric driving element, and at least one piezoelectric sensing element. The at least one piezoelectric driving element and the at least one piezoelectric sensing element are stacked on each other, and are mounted on the tuning fork. The power supply module is electrically connected and outputs a voltage to the at least one piezoelectric driving element to deform the at least one piezoelectric driving element. The at least one piezoelectric sensing element is extruded and outputs a voltage signal. The sensing-phase corrector obtains the voltage signal and outputs a clock signal to feedback control the voltage on the at least one piezoelectric driving element to optimize a deformation frequency of each piezoelectric element.

主权项

1. A high accuracy level transducer comprising:
a power supply module producing an adjustable DC voltage; a tuning fork module having
a tuning fork;at least one piezoelectric driving element mounted on the tuning fork, wherein each one of the at least one piezoelectric driving element has
two electrode surfaces, wherein one of the two electrode surfaces is electrically connected to the power supply module, wherein a voltage between the two electrode surfaces is a square wave driving voltage signal; andat least one piezoelectric sensing element mounted on the tuning fork and stacked with the at least one piezoelectric driving element, wherein each one of the at least one piezoelectric sensing element has
two electrode surfaces; andwherein when the at least one piezoelectric driving element deforms, the at least one piezoelectric sensing element outputs a sine wave sensing voltage signal;a sensing-phase corrector electrically connected to the tuning fork module and having
a sine wave signal processor, wherein the sine wave signal processor produces a reversed sensing voltage signal based on the sine wave sensing voltage signal;a phase shifter; andwherein the sensing-phase corrector obtains the sine wave sensing voltage signal and outputs a clock signal based on the sine wave sensing voltage signal to the other electrode surface of the at least one piezoelectric driving element, wherein a phase difference between the sine wave sensing voltage signal and the clock signal is 90 degrees; and a controller electrically connected to the power supply module, the tuning fork module and the sensing-phase corrector, and having a calculation function, wherein the controller obtains a sensing result based on the square wave driver voltage signal on the at least one piezoelectric driving element, the reversed sensing voltage signal produced by the sine wave signal processor and the clock signal produced by the sensing-phase corrector.