| タイトル | Electrical capacitance clearanceometer |
| 本文（外部サイト） | http://hdl.handle.net/2060/20080004303 |
| 著者（英） | Young, Joseph C.; Hester, Norbert J.; Hornbeck, Charles E. |
| 著者所属（英） | General Electric Co. |
| 発行日 | 1992-11-24 |
| 言語 | eng |
| 内容記述 | A hot gas turbine engine capacitive probe clearanceometer is employed to measure the clearance gap or distance between blade tips on a rotor wheel and its confining casing under operating conditions. A braze sealed tip of the probe carries a capacitor electrode which is electrically connected to an electrical inductor within the probe which is inserted into a turbine casing to position its electrode at the inner surface of the casing. Electrical power is supplied through a voltage controlled variable frequency oscillator having a tuned circuit in which the probe is a component. The oscillator signal is modulated by a change in electrical capacitance between the probe electrode and a passing blade tip surface while an automatic feedback correction circuit corrects oscillator signal drift. A change in distance between a blade tip and the probe electrode is a change in capacitance therebetween which frequency modulates the oscillator signal. The modulated oscillator signal which is then processed through a phase detector and related circuitry to provide an electrical signal is proportional to the clearance gap. |
| NASA分類 | Electronics and Electrical Engineering |
| 権利 | No Copyright |
