Gas mass flow measurement method - uses IR absorption in single or two phase flow illuminated at two points for comparison with reference (NL 26.10.77)

摘要

The method is used for determining the mass flow of stationary or non-stationary one-or-two-phase flow in a fluid channel it involves measurement of the concentration and corresponding transit time along a defined stretch of channel using an infrared absorption techniques. The method is designed for use with continuous contactless mass flows of gas and to give short response time, high accuracy, and, with two-phase flow, separate simultaneous measurements for each flow. The gas is illuminated with infrared light at two points in the channel and the measurement beams transmitted are compared with reference beams and processed optically and electronically using filters and timers.