Abstract: 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.

Abstract: A plurality of types of liquid with different electrical conductivity flow through a micro channel having a plurality of channels. When an electric field is applied thereto, an electrokinetic driving flow generated in the micro channel attracts objective submicron particles to one side. Therefore, the particles are completely separated in a single operation by use of the micro channel having extremely simple structure, without the necessity of special machining of the channels and the like.

Abstract: An ultrasonic flowmeter casts an ultrasonic pulse toward a measurement line ML, processes ultrasonic echo signals, and calculates the position and speed of each ultrasonic reflector positioned along the measurement line ML by analyzing the ultrasonic echo signals subjected to signal processing. The flowmeter filters the ultrasonic echo signals. A trigger oscillator of the flowmeter controls signal transmission/reception timing according to an adjustable sequence wherein one cycle is formed of three consecutive sets of emissions of an ultrasonic pulse and reception of ultrasonic echo signals, and a waiting period of time.

Abstract: An ultrasonic flowmeter 10 includes: emission trigger oscillating means 22 for outputting a trigger signal; ultrasonic oscillating means 23 for generating and outputting ultrasonic pulses by the trigger signal from said emission trigger oscillating means; ultrasonic pulse receiving means 24 for transmitting the ultrasonic pulses output from said ultrasonic oscillating means toward a measurement line within a fluid, and receiving an ultrasonic echo signal serving as reflected waves reflected off an ultrasonic reflector suspended within said fluid; signal processing means 25 for subjecting the ultrasonic echo signal received by said ultrasonic pulse receiving means to signal processing; and signal analyzing means 26 for analyzing the ultrasonic echo signal subjected to the signal processing by said signal processing means, calculating the position and speed of said ultrasonic reflector positioned along said measurement line, and measuring at least one of the flow-speed distribution and flow of said fluid from t

Abstract: An ultrasonic flowmeter 10 comprises: a trigger oscillator 14; a pulse receiver 16; a transducer 20 for casting an ultrasonic pulse toward a measurement line ML within a fluid tube 22 according to an electric signal from the pulse receiver 16; a signal processing unit 27 for performing signal processing for ultrasonic echo signals corresponding to a reflected wave received by the transducer 20; a flow-speed distribution calculating member 28 for calculating the position and speed of each ultrasonic reflector positioned along the measurement line ML by analyzing the ultrasonic echo signals subjected to signal processing; and a flow calculating member 29, wherein the signal processing unit 27 includes a filtering processing member 25 for performing filtering processing for the ultrasonic echo signals and an AD converter 17 for performing AD conversion.

Abstract: A plurality of types of liquid with different electrical conductivity flow through a micro channel having a plurality of channels. When an electric field is applied thereto, an electrokinetic driving flow generated in the micro channel attracts objective submicron particles to one side. Therefore, the particles are completely separated in a single operation by use of the micro channel having extremely simple structure, without the necessity of special machining of the channels and the like.