Name
Title | ||
|---|---|---|
Tip Clearance Measurement Technique for Stationary Gas Turbines Using an Autofocusing Millimeter-Wave Synthetic Aperture Radar |
Abstract | ||
|---|---|---|
In this paper, an autofocusing radar technique is presented for tip clearance measurements in combustion turbines capable of resolving the edges of a typical blade tip. The clearance is determined by measuring the reflection at the blade tip while passing by the antenna, subsequently focusing the data by means of a matched filter operation and interpreting the phase of the blade edge reflection according to the continuous wave radar principle. For this, an autofocus approach was developed, which minimizes defocusing effects and provides an estimate of the clearance as the first result, which is utilized to overcome the phase ambiguity and, thus, to increase the measurement range. The autofocus algorithm applies a weighted phase gradient of the pointlike blade edge reflection as cost function and sensitive indicator for the focal quality. |
Year | DOI | Venue |
|---|---|---|
2012 | 10.1109/TIM.2012.2182850 | Instrumentation and Measurement, IEEE Transactions |
Keywords | Field | DocType |
blades,combustion,distance measurement,filtering theory,gas turbines,reflection,reflectivity,synthetic aperture radar,antenna,autofocusing millimeter-wave synthetic aperture radar,autofocusing radar technique,blade tip,combustion turbine,continuous wave radar principle,cost function,defocusing effect,focal quality,matched filter operation,phase ambiguity,pointlike blade edge reflection,reflection measurement,sensitive indicator,stationary gas turbine,tip clearance measurement technique,weighted phase gradient,Distance measurement,millimeter-wave radar,self-focusing,synthetic aperture radar (SAR),turbomachinery | Radar,Continuous-wave radar,Extremely high frequency,Tip clearance,Autofocus,Synthetic aperture radar,Optics,Azimuth,Electronic engineering,Matched filter,Mathematics | Journal |
Volume | Issue | ISSN |
61 | 6 | 0018-9456 |
Citations | PageRank | References |
2 | 0.42 | 2 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Andreas Schicht | 1 | 2 | 0.42 |
| Stefan Schwarzer | 2 | 17 | 2.07 |
| Lorenz-Peter Schmidt | 3 | 10 | 2.20 |