Patent ID: 9279707
Filing Date: 2016-03-08
CPC Classification: G01F,Y10T

Claim Text:
1. A method for manufacturing an ultrasonic, flow measuring device, which includes a measuring tube having a straight measuring tube axis, a first transmitter for sending an acoustic signal on a first signal path, a first receiver for receiving the acoustic signal on the first signal path and at least a first reflection surface for reflecting the first acoustic signal on the first signal path, comprising the steps of: selecting more than one straight subsections of the first signal path, which should have different distances from the measuring tube axis; establishing the distances of the straight subsections from the measuring tube axis; calculating values of lengths of the straight subsections, as projected on the measuring tube axis, as a function of the number of straight subsections with the same distance from the measuring tube axis and the respective distances from the measuring tube axis, wherein projection of a subsection on the measuring tube axis includes projection of said subsection onto a plane parallel to the measuring tube axis and projection of said projected subsection on the measuring tube axis; inserting at least a first reflection surface in the measuring tube such that the acoustic signal on the path from the first transmitter to the first receiver is so reflected on at least the first reflection surf ace that the first signal path comprises the straight subsections with the selected distances and the calculated values of the lengths as projected on the measuring tube axis; wherein the values of the lengths of the straight subsections as projected on the measuring tube axis are calculated as a function of the number of straight subsections with the same distance from the measuring tube axis, and the respective distances from the measuring tube axis, in the following way: ascertaining weighting factors for measuring paths of a multipath, ultrasonic, flow measuring device for flow measurement according to a predetermined calculation formula as a function of the distances of the measuring paths from the measuring tube axis, which distances from the measuring tube axis are the same as those of the straight subsections; dividing the weighting factors by the number of measuring paths with the same distance from the measuring tube axis; and establishing the values of the lengths of the straight subsections, as projected on the measuring tube axis, having the same distances from measuring tube axis, by dividing the results among the respectively provided number of straight subsections with the same distances from measuring tube axis.