Patent ID: 9702768
Date: 2017-07-11
CPC Classifications: G01K

Claim:
1. A method for acoustic pyrometry comprising: recording, by a receiver of an acoustic pyrometer system, an acoustic signal generated by a source included in the acoustic pyrometer system and propagating through a gas medium traveling through a pipe or other channel; arranging a plurality of samples representing the acoustic signal at the source and the receiver into a plurality of windows based on a physically minimum possible propagation delay from the source to the receiver given a temperature range of interest; processing, by a processor within the acoustic pyrometer system, the plurality of samples representing the acoustic signal at the source and the receiver to generate data that represent the plurality of samples in a frequency domain; arranging, by the processor within the acoustic pyrometer system, the data that represent the samples in the frequency domain in a plurality of frequency ranges and selecting one or more frequency ranges with a minimal influence of noise; correlating, by the processor within the acoustic pyrometer system, the data in each selected frequency range of the source with corresponding data of the receiver to determine a weighted cross-spectral power estimate value for each selected frequency range related to the source corresponding to a delay time; determining, by the processor within the acoustic pyrometer system, a summation of the maximum weighted cross-spectral power estimate value of each of the selected frequency ranges by using a range of delays wherein the summation has a maximum, such that a sparseness of a mean weighted cross-spectral power estimate of the selected frequency ranges is maximized; and applying, by the processor within the acoustic pyrometer system, the determined signal delay between the source and the receiver to calculate a temperature of the gas medium.