Rotating Blade Pressure-Deformation Imaging With Phase-Locked Strobes
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Solution Overview
Problem
Existing pressure and deformation measurement technologies for rotating blades face challenges such as image motion blur and low signal-to-noise ratio, particularly at high speeds, limiting the integration and precision of PSP and DIC methods, which have not effectively addressed the need for synchronous, high-definition data acquisition.
Innovation Solution
A synchronous measurement system and method integrating PSP and DIC methods, utilizing a binocular camera, digital delay generator, photoelectric speed sensor, computer, light source, and reflective sticker, to synchronize image acquisition and illumination, reducing motion blur and enhancing signal-to-noise ratio through phase-locked triggering and stroboscopic illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PSP and DIC methods are integrated for simultaneous measurement, then global pressure and deformation measurement capability is improved, but image motion blur increases and signal-to-noise ratio decreases at high speeds
Solution Approach 1:
The patent employs periodic strobe illumination synchronized with the rotational frequency of the blade. By triggering the light source at specific intervals matching the rotation period, the moving blade is illuminated at consistent phases, creating sharp, blur-free images while maintaining global measurement capability through the periodic capture of pressure and deformation data
Solution Approach 2:
The patent implements a feedback control system where the rotational speed and phase information from the rotating blade are continuously monitored and fed back to adjust the strobe illumination timing. This closed-loop feedback ensures that the illumination and image capture remain synchronized with the blade's rotational position, maintaining measurement precision despite speed variations
2Productivity
If high-speed rotation measurement is performed, then productivity and data acquisition speed are improved, but image motion blur increases and measurement precision deteriorates
Solution Approach 1:
The system uses periodic strobe illumination synchronized to the rotational frequency, capturing images at specific phases of the rotation cycle. This allows high-speed rotation measurement while maintaining image sharpness by freezing the motion at consistent intervals, thus achieving both high productivity and measurement precision
Solution Approach 2:
The patent replaces traditional mechanical contact measurement methods with optical-based PSP and DIC techniques. This substitution enables non-contact, high-speed measurement of rotating blades without physical interference, allowing data acquisition at rotational speeds that would be inaccessible to mechanical sensors while maintaining measurement precision through optical field capture
3Measurement precision
If traditional pressure sensors are used on rotating blades, then localized pressure measurement is achieved, but installation complexity and device complexity increase
Solution Approach 1:
The patent applies PSP coating to the blade surface, which serves multiple functions simultaneously: it acts as a pressure-sensitive indicator, a decorative layer, and a non-contact measurement interface. This universal application eliminates the need for separate pressure sensor installations, reducing device complexity while maintaining localized pressure measurement capability through the spatially resolved luminescence patterns
Solution Approach 2:
The patent replaces mechanical pressure sensors with optical-based PSP technology. The pressure information is encoded in the luminescence intensity of the paint layer, which is then read remotely by cameras. This substitution eliminates complex sensor mounting, wiring, and data transmission systems while providing equivalent or superior measurement precision across the blade surface
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-definition, synchronous measurement of surface pressure and deformation on rotating blades with improved signal-to-noise ratio, suitable for high-speed conditions, and low system complexity.
Implementation Method 1
Pressure sensitive paint (PSP) is a model surface pressure measurement method based on optical signal
Implementation Method 2
synchronize image acquisition and illumination, reducing motion blur and enhancing signal-to-noise ratio through phase-locked triggering and stroboscopic illumination
Implementation Method 3
The binocular camera, equipped with lenses and optical filters, is used for image acquisition
Implementation Method 4
The photoelectric speed sensor is aligned with the reflective label pasted on the shaft of the measured blade
Data Source
AI summary
This invention relates to a system and method for synchronous measurement of pressure and deformation on the surface of a rotating blade. The system consists of a binocular camera, a light source, a digital delay generator, a photoelectric rotational speed sensor, a counter and PSP paint. The method involves the following steps. Firstly, prepare a PSP coating with marker points on the surface of the measured blade. Then, perform binocular calibration and obtain the phase-locked position. Control the opening of the shutter of the binocular camera and then trigger the light source to emit stroboscopic illumination at the phase-locked position. When the image has accumulated sufficient intensity, the counter breaks the circuit and the shutter is closed. Subsequently, substitute the calibration parameters of the binocular camera and the PSP, register and conduct three-dimensional reconstruction on the obtained images to obtain the three-dimensional pressure and deformation values on the blade surface.