The Tokyo Electric Power Company, Incorporated

Other

Kabushiki Kaisha Toshiba

Keio University

Hideaki Tezuka

Michitsugu Mori

Kenichi Tezuka

Michio Sato

Tadashi Narabayashi

Yasushi Takeda

Koichi Hishida

A fluid measurement system includes a long focus optical system at a CCD camera, and an image processing means for comparing particle images taken at two time points for analysis. The system further includes a high-pass filter for leaving high frequency components at a predetermined frequency and higher from the luminance signal of the image, so that a turbulence structure occurring in the fluid to be measured is extracted, and the turbulence structure is captured and its image is taken. Therefore, the flow field of an inaccessible fluid to be measured can be analyzed.

Fluid measuring system and fluid measuring method

A fluid measurement system includes a long focus optical system at a CCD camera, and an image processor for comparing particle images taken at two time points for analysis. The long focus optical system is provided with a shield which shields a part including a central portion of a main mirror at an arbitrary shield rate. As a result, the particle image of a tracer is enlarged with its contour kept clear, that is, in focus, and therefore, the image having a luminance which allows analysis by the PIV method can be taken in spite of use of the long focus optical system.

Fluid measuring system and long focal point optical system

Disclosed is an ultrasonic Doppler flow measurment system that achieves flow measurement regardless of the temperature of a fluid. A temperature sensoris combined with a pipeto measure the temperature of a fluidA controllercalculates a frequency that will cause cavitation when an ultrasonic transducerexerts an ultrasonic vibration on the fluidon the basis of a temperature measured by the temperature sensorand controls a sinusoidal oscillator

Ultrasonic cavitating apparatus and ultrasonic doppler flow measurement system

A bubble generator to bring out performance of a Doppler ultrasonic flowmeter to the maximum extent is provided. The bubble generator is provided with a bubble generation member generating bubbles suitable for a predetermined frequency of an ultrasonic pulse emitted into a fluid to be measured and feeding the bubbles into the fluid pipe, and a uniform dispersion member dispersing the bubbles fed uniformly in the pipe, the bubble generator is installed on an upstream side of the fluid pipe with respect to an ultrasonic transducer. The bubble generation member has a Venturi tube, and the uniform dispersion member has a negative pressure generating device, in which the fluid to be measured drawn out by the uniform dispersion member from inside the fluid pipe is returned into the fluid pipe together with the bubbles fed into the fluid pipe via the Venturi tube.

Bubble generator for use in doppler ultrasonic flowmeter and doppler ultrasonic flowmeter

An ultrasonic flowmeter includes: an emission trigger oscillator outputting a trigger signal; an ultrasonic oscillator generating and outputting ultrasonic pulses by the trigger signal from the emission trigger oscillator; an ultrasonic pulse receiver transmitting the ultrasonic pulses output from the ultrasonic oscillator toward a measurement line within a fluid, and receiving an ultrasonic echo signal serving as reflected waves reflected off an ultrasonic reflector suspended within the fluid; a signal processor subjecting the ultrasonic echo signal received by the ultrasonic pulse receiver to signal processing; and a signal analyzer analyzing the ultrasonic echo signal subjected to the signal processing by the signal processor, calculating the position and speed of the ultrasonic reflector positioned along the measurement line, and measuring at least one of the flow-speed distribution and flow of the fluid from the calculated results.

Ultrasonic flow-velocity distribution meter/flowmeter, method of ultrasonically measuring flow velocity distribution/flowrate, program for ultrasonically measuring flow velocity distribution/flowrate

Growing community of inventors

Tokyo, Japan

Hideaki Tezuka