Siemens Energy, Inc.

Christine P Spiegelberg

Erwan Baleine

Heiko Claussen

Upul P DeSilva

A microphone array for detecting acoustic emissions generated by equipment. The array includes at least one grid having a plurality of sensors each including a compact arrangement of optical fiber having first and second optical fiber ends wherein the first optical fiber end of a first sensor is terminated. The array also includes an optoelectronic device coupled to a second optical fiber end of a second sensor, wherein the optoelectronic device generates laser light that is transmitted through the plurality of sensors in the grid and is reflected back to the optoelectronic device to enable detection of acoustic emissions.

Optical fiber based microphone array for detecting acoustic emissions generated by an area of interest

A distributed sensing system for detecting a flashback condition in a combustor for a gas turbine engine The distributed sensing system includes one or more strategically positioned fiber optic cables provided upstream of the combustion area in the combustor. The distributed sensing system employs Rayleigh backscattering and swept-wavelength interferometry to measure temperature and reliably identify the location of the flashback condition The fiber optic cable is specially fabricated to have a high temperature resistance suitable for those temperatures existing during flashback conditions. The fiber optic cable can be wrapped on an inside of a combustion basket or on an outside of the combustion basket, and in a serpentine manner or otherwise.

Flashback detection in gas turbine engines using distributed sensing

Apparatus and method for thermally mapping a component in a high temperature environment. An optical probe () has a field of view () arranged to encompass a surface of a component () to be mapped. The probe () captures infrared (IR) emissions in the near or mid IR band. An optical fiber () has a field of view to encompass a spot location () on the surface of the component within the field of view () of the probe (). The fiber () captures emissions in the long IR band. The emissions in the long IR band are indicative of an emittance value at the spot location. This information may be used to calibrate a radiance map of the component generated from the emissions in the near or mid IR band and thus map the absolute temperature of the component regardless of whether the component includes a TBC.

Dual infrared band apparatus and method for thermally mapping a component in a high temperature combustion environment

Operational gas turbine engine housing or casing dynamic strain, temporary or permanent displacement and/or temperature is measured by a distributed fiber optic sensing system (DFOSS) utilizing optical frequency domain reflectometry (OFDR) that is coupled to the turbine engine housing. The DFOSS/OFDR system measures localized variances in strain along the length of an optical fiber (OF), which are correlated with turbine engine housing displacement. Temperature influence on the measured localized strain variances is accounted for by obtaining temperature information from an another measurement system or by taking the same type OFDR measurements on unrestrained optical fiber (OF) and deriving compensated strain measurements that are not temperature influenced. The derived strain measurements along the DFOSS are correlated with housing displacement. Other embodiments include separate displacement measuring modules, each including DFOSS optical fibers, coupled along the engine housing.

Method and apparatus for measuring operational gas turbine engine housing displacement and temperature by a distributed fiber optic sensing system utilizing optical frequency domain reflectometry

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Winter Park, FL, United States of America

Christine P Spiegelberg