Ultrasonic detector

Details Ultrasonic detector Ultrasonic detector

1991-08-23

1993-03-09

Arana, Louis

Measuring and testing

Vibration

By mechanical waves

340621, G01N 924, G08B 2100

Patent

active

051917955

ABSTRACT:
An ultrasonic detector for detecting air in a fluid passage is disclosed. The detector comprises a transmitting crystal and complementary receiving crystal disposed around the fluid passage. A sweep oscillator is used to apply a variable-frequency signal to drive the transmitting crystal into resonance so that a burst of ultrasonic energy is released therefrom. The swept frequency range encompasses the resonant frequency of the transmitting crystal, ensuring that it resonates. If there is fluid in the passage, the ultrasonic energy causes a relatively high voltage to develop across the receiving crystal. Air in the passage attenuates transmission of the ultrasonic energy so that a low voltage signal is developed across the receiving crystal. A sensor circuit connected to the receiving crystal monitors the signal developed thereacross and in response to the magnitude of the signal, asserts a signal that indicates whether there is air or fluid in the passage.

REFERENCES:
patent: 4275363 (1981-06-01), Mishiro et al.
patent: 4554477 (1985-11-01), Ratcliff
patent: 4607520 (1986-08-01), Dam

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