METHOD AND APPARATUS FOR HIGH TEMPERATURE GAS FLOW VELOCITY SENSING

摘要

An off-gas velocity measuring device which allows for fast response analysis of furnace off-gas flow velocity and/or volume using two or more detectors positioned along the gas flow. The detectors include a radiation receiver/sensor operable to detect one or more signatures of the natural energy emissions of the passing off-gas stream. The device determines the time-of-flight between the spaced receiver/sensors of a selected feature of the spectrum of emitted radiation independently of the off-gas stream chemical or particulate composition.