When thus accurately aligned along the axis, with this arrangement, the vertically polarized shear wave coupled into the pipe follows a skipping path as shown in Figure 1 which remains coherent for a distance of several skip lengths along the wall, energizing the wall to launch a narrow signal beam in a diametral plane across to the opposing transducer. We may periodically send promotional emails about new products, special offers or other information which we think you may find interesting using the email address which you have provided. One downside is that it will dry out in a matter of hours (6-12 hours) depending upon the environment. Electrode connections and electromagnetic shielding may be of conventional type. These and other features of the invention will be understood from the description below taken in connection with the figures illustrating representative embodiments thereof, wherein: Figure 1 illustrates a first embodiment of the invention; The gel removes the air-gap layerbetween the thickness gauge probe (transducer) and the material to be tested. Our coupling gel is soluble in water, non-aggressive to skin and environment-friendly. Overall, cookies help us provide you with a better website by enabling us to monitor which pages you find useful and which you do not. For large liquid volumes with high velocity flows, or in installation where solid particles addition is an issue, a good alternative would be gas bubbles injection, which is in principle non-polluting. Only a small amount of fluid is required to gain solid "coupling" or connection. It would therefore be desirable to develop an external ultrasonic system for measuring the flow of low density liquids and fluids such as steam or gas in a conduit. The invention being thus described, variations and modifications will occur to those skilled in the art, and all such variations and modifications are considered to be within the scope of the invention, as defined by the claims appended hereto and equivalents thereof. This is especially true when we are dealing with things like corrosion where the only way to penetrate it is to push more ultrasound into the pipe. Clamp-on ultrasonic flow meter for low density fluids, 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MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME, Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow, Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g.



