Patent ID: 9453784
Filing Date: 2016-09-27
CPC Classification: F02C,F05D,G01H,G01K,G01M

Claim Text:
1. A method of operating a gas turbine engine, including determining a temperature of a working gas passing through a flow path within the gas turbine engine, the method comprising the steps of: transmitting an acoustic signal from an acoustic transmitter located at a predetermined axial location along the flow path of the gas turbine engine; receiving the acoustic signal from the acoustic transmitter at an acoustic receiver located at the predetermined axial location; the acoustic signal being encoded with a distinct signature defined by a set of predetermined frequencies transmitted as a non-broadband acoustic signal; wherein receiving the acoustic signal includes comparing a received signal to one or more transmitted signals to identify a similarity of the received signal to a transmitted signal to identify a transmission time for the received signal; determining a time-of-flight for the signal from the acoustic transmitter to the acoustic receiver; and processing the time-of-flight for the signal to determine a temperature in a region of the predetermined axial location.