| 摘要 |
<p>The present invention relates to an acoustic flow meter, particularly to an ultrasonic flow meter of the transit time differential type comprising a flow tube with an annular flow passage. The acoustic flow meter 11 comprises an outer casing 12 and a cylindrical flow tube 17. Within the flow tube is located a central elongate core body 18 held in a position co-axial with the flow tube 17 by two generally radially extending inwardly projecting support arms 19, 20. Surrounding the ends of the flow tube 17 are two cylindrical acoustic couplers 21, 22</p> |
