Fuji Electric Co., Ltd.

Nippon Kogaku K.k.

Yukio Nakagawa

Masaru Kohno

Ryuzo Motoori

Kiyoshi Saito

Masaki Isogai

Kazuteru Shinkai

Takeo Kada

Norimasa Tamaoki

In the ultrasonic wave phase matching diagnostic apparatus described in the specification, an array of ultrasonic transducers is arranged to transmit ultrasonic waves to an object to be investigated and to receive ultrasonic waves returned from the object. Focusing of the waves to a point in the object is accomplished by selective delaying of the transmitted signals from each of the ultrasonic transducers, and similar delays are imposed on received signals to define a focal point for signals received from the object. Scanning of the object is provided by stepwise changes in the ultrasonic transducers used for transmitting and receiving ultrasonic signals, and half-pitch scanning may be effected by using different numbers of ultrasonic transducers for transmission and reception of the ultrasonic waves.

Ultrasonic wave phase matching apparatus

An ultrasonic measuring apparatus is provided for measuring the flow velocity of a fluid in a pipe. The apparatus includes a pair of sensors which are mounted on a pipe, and which alternately transmit and receive ultrasonic waves. When the actual sound velocity of the ultrasonic wave in the fluid is not known, a value is assumed, a flow rate is measured, correct sensor mounting positions are calculated and the actual sound velocity of the ultrasonic wave is then determined. If the assumed sound velocity differs from the calculated sound velocity by more than a predetermined amount, the assumed sound velocity is adjusted and the procedure is repeated. Therefore, even when the sound velocity of an ultrasonic wave in a particular medium is not known, an actual sound velocity can be calculated. Accordingly, the ultrasonic measuring apparatus can accurately measure the flow velocity and flow rate of a fluid.

Ultrasonic apparatus for measuring the flow velocity of a fluid

According to the phototelegraphic transmission apparatus of the present invention, the image on developed films can be directly transmitted without any prints of the film. In order to reproduce high-quality image, the apparatus comprises two gradation correction means, one of which is so designed that one of three operation modes may be selected.

Phototelegraphic transmission apparatus

An image processing apparatus for a phototelegraphic apparatus for transmitting a film image has a frame for holding a film in which an image is optically recorded, a line sensor consisting of an array of CCDs for reading the film image, a main scanning direction frame signal elimination circuit for eliminating signal components corresponding to the frame from maximum and minimum densities detected by a peak hold circuit among main scanning image signals, and a microcomputer for detecting signal components corresponding to the frame from subscanning image signals. Noise components in image signals obtained by the line sensor due to the presence of the frame or soiling or scratching of the film are eliminated with a simple circuit configuration.

Image processing apparatus in film image phototelegraphy

An ultrasonic metering device having two ultrasonic transducers, each having an ultrasonic conversion element and a wedge for holding the conversion element, mounted on a pair of mounting members which are adapted to be mounted on a pipe in which a fluid to be measured flows. The mounting members clamp the pipe with first end portions of the mounting members being hingedly coupled to each other. Tightening means is provided for coupling opposite free end portions of the mounting members which have clamped the pipe to thereby fixedly secure the mounting members to the pipe.

Ultrasonic metering device

An ultrasonic measuring apparatus of the type having a pair of transducers disposed oppositely on a pipe through which a fluid to be measured flows and which are so controlled alternately as to convert an input electrical signal to an acoustic signal and to convert a received acoustic signal to a received electrical signal. The apparatus includes a time difference detecting means for receiving an output signal from a delay means and the received electrical signal for detecting a time difference between a delayed counting time obtained from the delay means and a propagating time required for an ultrasonic wave to propagate through the fluid to be measured. Comparing means are provided for comparing a voltage signal corresponding to the time difference with first and second set voltages and monitoring means receiving the comparison result from the comparing means for judging whether the fluid flow is propagated in the pipe in a normal condition or in an abnormal condition. The present invention ensures a quick detection of abnormal propagation of the ultrasonic wave in the pipe and obtains a correct measurement values without misjudgement.

Ultrasonic measuring apparatus

In an ultrasonic fluid flow rate measuring apparatus of the type having a pair of electro-acoustical transducers disposed in respective up-stream and down-stream positions relative a fluid flow and the flow rate is obtained from the difference between the oscillation frequencies of first and second oscillation circuits, the present invention includes an abnormality monitoring circuit responsive to a signal H corresponding to the output of the receiving transducer for providing an output signal W when the signal H exceeds an abnormality monitoring voltage E.sub.1, a trigger circuit for providing an output signal Z to a time difference detection circuit when the signal H exceeds a set voltage E.sub.3 and for providing in response to a signal F an output signal Z to the time difference detection circuit when the signal H exceeds a set voltage E.sub.30, and a mistrigger detection circuit for providing the output signal F when the output signal W is present and when a signal R from the time difference circuit exceeds a set voltage E.sub.61. The present invention further includes a delay compensation circuit for delaying by a predetermined period of time the providing of an output signal from a counter to a delay element, the predetermined period of time being set in accordance with the output signal F of the mistrigger detection circuit.

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Kawasaki, Japan

Yukio Nakagawa