An apparatus having a multi-band sensor assembly for measuring a parameter of a fluid flow flowing within a pipe

摘要

An apparatus is provided that measures the speed of sound and/or vortical disturbances propagating in a fluid flow to determine a parameter of the flow propagating through a pipe. The apparatus includes a sensing device that includes an array of pressure sensors used to measure the acoustic and convective pressure variations in the flow to determine a desired parameter. The sensing device includes a unitary strap having a plurality of bands disposed parallel to each other. The bands are interconnected by cross members to maintain the bands a predetermined distance apart. . Each of the bands having a strip of piezoelectric film material mounted along a substantial length of the bands. The piezoelectric film material provides a signal indicative of the unsteady pressures within the pipe. The sensing device includes a conductive shield around the multi-band strap and the piezoelectric film material to provide a grounding shield. A cover is disposed around the entire assembly to protect it from environmental influences. The unitary multi-band strap permits the sensors to be accurate spaced apart during manufacturing and ensures fast and simple installation of the meter on the pipe.