Patent ID: 8374806
Filing Date: 2013-02-12
Classification: G01F

Abstract:
1. An ultrasonic phase-shift detection device comprising: a clock generator for generating a clock signal; a frequency divider connected to the clock generator for frequency-dividing the clock signal generated by the clock generator to produce a frequency-divided clock signal with a predetermined frequency, thereby generating an input ultrasonic signal with the predetermined frequency; a first counter connected to the divider for counting the received frequency-divided clock signal to thus have a counting value; a comparator connected to the first counter for comparing the counting value of the first counter with a predetermined number, and sending the input ultrasonic signal when the counting value of the first counter is smaller than or equal to the predetermined number; a phase detector connected to the comparator for receiving the input ultrasonic signal and a transmitted ultrasonic signal and comparing the phase of the two signals so as to generate an analog result signal for being outputted by the detection device; and a second counter connected to the phase detector for counting the analog result signal sent by the phase detector to generate a digital result signal for being outputted by the detection device.