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Self-calibration dual-probe microwave tip clearance test system

A tip clearance and test system technology, which is applied in the field of double-probe microwave tip clearance test system, can solve the problem of increased measurement error of reference signal resonant frequency offset, and achieve the effect of reducing measurement error and avoiding measurement error

Inactive Publication Date: 2017-03-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a self-calibrating dual-probe microwave tip clearance test system to overcome the shortcomings of insufficient reference signals in the existing system and the increase in measurement error caused by the resonant frequency shift caused by temperature changes

Method used

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0017] This embodiment provides a self-calibrating dual-probe microwave tip clearance test system, the system structure is as follows figure 2 Shown:

[0018] The microwave signal generated by the PLL passes through the power divider to produce two channels with the same amplitude and the initial phase is When the two incident wave signals pass through the circulator and reach the front end of probe A and probe B respectively, the phase becomes The signal passing through probe A is reflected by the moving blade tip, and the phase reflected back to the front end of the probe becomes The other signal passing through probe B is reflected by the fixed blade tip (the fixed gap is set to 0.01mm), and the phase reflected back to the front end of the probe becomes The two reflected signals pass through the probe and the circulator to form Th...

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Abstract

The invention belongs to the technical field of microwave ranging, and provides a dual-probe microwave tip clearance test system with a self-calibration function in order to overcome the defect that the measurement error increases due to resonance frequency deviation caused by insufficient reference signals and temperature change in the existing system. The system comprises a power divider, a detection circuit, a benchmark circuit, and a data processing module. The power divider generates two microwave signals of the same amplitude and phase and inputs the two microwave signals to the detection circuit and the benchmark circuit respectively, the detection circuit and the benchmark circuit generate a detection signal and a reference signal respectively, and the detection signal and the reference signal are input to the data processing module to get the microwave tip clearance. A simulated leaf is set at a fixed spacing, and the detection circuit and the benchmark circuit are of a completely symmetrical circuit structure, so that the influence of resonance frequency deviation caused by temperature change is avoided effectively; the reference signal is generated by the benchmark circuit, including phase shift generated when incident wave passes through a circulator and a probe; the measurement error is reduced greatly; and self-calibration dual-probe microwave tip clearance test is realized.

Description

technical field [0001] The invention belongs to the technical field of microwave distance measurement, relates to microwave signal transmission, reception and signal processing, in particular to a dual-probe microwave blade tip clearance testing system with self-calibration function. Background technique [0002] The microwave blade tip clearance test technology is a phase-based test technology, which is mainly proposed for the measurement and control of the small gap between the casing and the blade of the aero-engine. A microwave signal of a certain frequency is emitted by the microwave probe (antenna) fixed on the casing. When the blade passes through the front end of the probe, reflection occurs, and the reflected wave is received by the probe. The incident wave and reflected wave are distinguished by the circulator at the rear end. Open, by comparing the phase difference between the incident wave (reference signal) and the reflected wave The gap between the blade and ...

Claims

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Application Information

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IPC IPC(8): G01S13/08G01S7/40
CPCG01S7/40G01S13/08
Inventor 彭斌周伟张万里张文旭
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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