Reason's for wanting the transducer separation: We'd like to be able to attach the clamped on transducers on the pipe. If grease is used as the ultrasonic couplant between transducer and pipe, the grease gets scraped off as one slides the transducers back and forth while looking for the maximized receive signal. If a rubber strip is used as the couplant, sliding the transducers to optimize signal strength is almost impossible due to the high friction of the rubber material. We'd like to be able to also calculate the time of flight. We'd like to understand why the calculated separation is different from the actual separation. Is the Snell's law calculation not accurate? What else is needed in the model?
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