Title:
ULTRASONIC FLOW METER
Document Type and Number:
Japanese Patent JPS57149918
Kind Code:
A
Abstract:
PURPOSE: To measure an extremely low flow rate by supporting an ultrasonic transmitter and a receiver with a sound absorbing material at a prescribed facing angle.
CONSTITUTION: An ultrasonic transmitter 1 and a receiver 2 are stuck to a base plate 12 at 160W170°, preferably 167° opposing angle θ, and the base plate 12 is coupled with a sound absorbing material 13 having a low elastic modulus. As a result, when facing distance l between the transmitter 1 and receiver 2 varies, the influence of a standing wave is eliminated and the adjustment of an oscillating circuit 3 which drives the transmitter 1 is facilitated; and further the receiver 2 obtains a signal stable against slight variation in oscillation frequency.
Inventors:
WATANABE HAJIME
SAKAI HIDEO
WATANABE KAZUHIRO
WATANABE TAKESHI
SAKAI HIDEO
WATANABE KAZUHIRO
WATANABE TAKESHI
Application Number:
JP3557981A
Publication Date:
September 16, 1982
Filing Date:
March 12, 1981
Export Citation:
Assignee:
KAWAGUCHIKO SEIMITSU KK
International Classes:
G01F1/32; G01P5/01; (IPC1-7): G01F1/32; G01P5/01
Domestic Patent References:
| JPS50142065A | 1975-11-15 | |||
| JPS5513873A | 1980-01-31 |
Foreign References:
| US3903742A | 1975-09-09 | |||
| US3965730A | 1976-06-29 |