Title:
超音波流量計及び流体減圧装置
Document Type and Number:
Japanese Patent JP5614809
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter which is capable of improving a degree of freedom in arrangement for a duct having a noise generating source, and a fluid pressure reduction apparatus.SOLUTION: In an ultrasonic flowmeter 10, a pair of ultrasonic sensors 20A and 20B for measurement are disposed to face each other in a direction crossing an axial direction of a duct 90 where a fluid flows, and an ultrasonic sensor 30A for noise cancellation is provided at a position in axial symmetry with the receiving-side ultrasonic sensor 20A for measurement with respect to a center axis J1 of the duct 90. A differential amplifier circuit 51 is provided in which, while the receiving-side ultrasonic sensor 20A for measurement receives ultrasonic waves for measurement, a receiving signal outputted by the ultrasonic sensor 30A for noise cancellation receiving the ultrasonic waves is acquired as a noise component in a receiving signal outputted by the receiving-side ultrasonic sensor 20A for measurement receiving ultrasonic noise together with ultrasonic waves for measurement, and the noise component is canceled from the receiving signal of the receiving-side ultrasonic sensor 20A for measurement.
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Inventors:
五明 智夫
Application Number:
JP2011032856A
Publication Date:
October 29, 2014
Filing Date:
February 18, 2011
Export Citation:
Assignee:
愛知時計電機株式会社
International Classes:
G01F1/66; H04R1/40; H04R3/00
Attorney, Agent or Firm:
Matsuura 弘