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Title: Optical Volumetric Flowmeter
Author: Dariush Modarress, Medhat Azzazy
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: A computer controlled nonintrusive volumetric flowmeter based on the application of laser anemometer for direct measurement of gas velocity in high pressure pipes is described. The flowmeter is based on the measurement of gas velocity at a number of points along one diameter. Two small laser sheets, one millimeter apart are projected into the flow. The instantaneous gas velocity is calculated by measuring the time of flight of micron-sized particles (present in the gas line) between the two sheets. Traversing of the two laser sheets, i.e., the measurement point, is remotely achieved through a translation of the optical head, all within a protective housing. The flowmeter is attached to a high pressure pipe spool and the optical access is achieved through a high pressure window. The design and fabrication of a laboratory prototype has been completed. In this paper, the design features of the flowmeter and topics such as accuracy and precision in relation with the optical flowmeter are discussed. Sample velocity profiles obtained for a fully developed pipe flow are presented and the total volumetric flow rates are calulated. Finally, the results of our measurement of the size and concentration of the particles in the gas pipeline are presented.

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