Patent ID: 7409300

Claim:
An ultrasonic flow-speed distributor and flowmeter comprising: emission trigger oscillating means for outputting a trigger signal; ultrasonic oscillating means for generating and outputting ultrasonic pulses by the trigger signal from the emission trigger oscillating means; ultrasonic pulse receiving means for transmitting the ultrasonic pulses output from the 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 the fluid; signal processing means for subjecting the ultrasonic echo signal received by the ultrasonic pulse receiving means to signal processing; and signal analyzing means for analyzing the ultrasonic echo signal subjected to the signal processing by the signal processing means, 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, wherein the signal processing means include a band-pass filtering processing unit for performing filtering processing for extracting the same frequency band as the ultrasonic pulses, of the received ultrasonic echo signals, an AD converter for subjecting the ultrasonic echo signal received from the band-pass filtering processing unit to analog-to-digital conversion, and a wall filter processing unit for subjecting the received ultrasonic echo signal to filtering processing using a wall filter, and said wall filter processing unit is configured so as to perform filtering processing wherein low-frequency equivalent components are discarded from the corresponding point-in-time echo level signals regarding all of the corresponding points-in-time which are obtained regarding a plurality of corresponding points-in-time from the ultrasonic echo signals for the amount of n+1 sequences, wherein n is a positive integer.