Abstract: The flow rate of a fluid can be measured using an ultrasonic flow meter according to the present invention with a higher measuring accuracy and a lower cost. The feature of the invention consists in an ultrasonic flow meter comprising a measurement tube for flowing a fluid to be subjected to measurement, a first oscillator fitted to the outer circumference of the measurement tube, a second oscillator fitted to the outer circumference of the measurement tube at a predetermined interval along the flow of the fluid from the first oscillator and an acoustic filter fitted to the measurement tube for cutting high frequency range of the oscillating wave propagating through the oscillating tube, in which the flow rate of a fluid is measured based on a time difference between a time required when the ultrasonic wave from the upstream oscillator reaches the downstream oscillator and another time required when the ultrasonic wave from the downstream oscillator reaches the upstream oscillator.

Abstract: The flow rate of a fluid can be measured using an ultrasonic flow meter according to the present invention with a higher measuring accuracy and a lower cost. The feature of the invention consists in an ultrasonic flow meter comprising a measurement tube for flowing a fluid to be subjected to measurement, a first oscillator fitted to the outer circumference of the measurement tube, a second oscillator fitted to the outer circumference of the measurement tube at a predetermined interval along the flow of the fluid from the first oscillator and an acoustic filter fitted to the measurement tube for cutting high frequency range of the oscillating wave propagating through the oscillating tube, in which the flow rate of a fluid is measured based on a time difference between a time required when the ultrasonic wave from the upstream oscillator reaches the downstream oscillator and another time required when the ultrasonic wave from the downstream oscillator reaches the upstream oscillator.

Abstract: The flow rate of a fluid can be measured using an ultrasonic flow meter according to the present invention with a higher measuring accuracy and a lower cost. The feature of the invention consists in an ultrasonic flow meter comprising a measurement tube for flowing a fluid to be subjected to measurement, a first oscillator fitted to the outer circumference of the measurement tube, a second oscillator fitted to the outer circumference of the measurement tube at a predetermined interval along the flow of the fluid from the first oscillator and an acoustic filter fitted to the measurement tube for cutting high frequency range of the oscillating wave propagating through the oscillating tube, in which the flow rate of a fluid is measured based on a time difference between a time required when the ultrasonic wave from the upstream oscillator reaches the downstream oscillator and another time required when the ultrasonic wave from the downstream oscillator reaches the upstream oscillator.

Abstract: An ultrasonic flow meter for determining the flow rate of fluid flowing through tubings. The ultrasonic flow meter comprises a measuring tube having a diameter constant in its entire length, and two ring shaped oscillators disposed longitudinally along the tube so as to substantially intimately contact the inner peripheral surface thereof with the outer peripheral surface of the tube. The one of said two oscillators is energized by electric AC energy to generate an ultrasonic wave, and the thus generated ultrasonic wave is detected by means of the other oscillator, and vice versa. Then the time required for propagating the ultrasonic wave from the upstream oscillator to the downstream oscillator, and that from the downstream oscillator to the upstream oscillator is measured, and the difference between the measured times is calculated by means of an arithmetric circuit to determine the velocity of the fluid flowing through the measuring tube.

Abstract: An ultrasonic flow meter for determining the flow rate of fluid flowing through tubings. The ultrasonic flow meter comprises a measuring tube having a diameter constant in its entire length, and three ring shaped oscillators disposed longitudinally along the tube so as to intimately contact the inner peripheral surface thereof with the outer peripheral surface of the tube. The central oscillator of said three oscillators is energized by electric AC energy to generate an ultrasonic wave. The thus generated ultrasonic wave is detected by means of forward and rearward oscillators. The ultrasonic wave detected by the forward oscillator and that detected by the rearward oscillator are processed by means of a comparator to obtain the flow rate of the fluid flowing through the measuring tube.

Abstract: A lamination type of magnetostrictor incorporated with a mass of plural plates of amorphous metal alloy material laminated by means of a binder wherein the thickness of the plates is equal to or more than 80 .mu.m and the space factor of amorphous metal alloy in the mass is equal to or more than 80% and a manufacturing method thereof.