Simultaneous Schlieren-Shadowgraph Visualization and Temperature Measurement Fields of Fluid Flow Using One Color CCD
Adrián Martínez-González1, David Moreno-Hernández2, Miguel León-Rodríguez3
1Departamento de Ingeniería Robótica, Universidad Politécnica del Bicentenario, Carr. Silao-Romita Km 2, San Juan de los Duran, Silao 36283, Guanajuato, Mexico.
Sensors (Basel, Switzerland)
|December 11, 2022
Summary
This study introduces an optical system using a color camera, RGB LED, and filters to capture fluid flow images and measure temperature fields. The system achieves a temperature resolution of approximately one degree Celsius.
Area of Science:
- Fluid dynamics
- Optical physics
- Thermal imaging
Background:
- Visualizing fluid flow often requires complex optical setups.
- Measuring temperature fields in fluids is crucial for many applications.
- Existing methods may lack the ability to capture multiple flow variables simultaneously.
Purpose of the Study:
- To develop an integrated optical system for simultaneous visualization of fluid flow variables and temperature measurement.
- To utilize a single snapshot to acquire shadowgraph and two-direction sensitivity Schlieren images.
- To measure fluid temperature fields using the obtained Schlieren images.
Main Methods:
- Employed an optical system comprising an RGB Light Emitting Diode (LED), shortpass and longpass ultra-thin filters as knife edges, and a color digital camera.
- Recorded shadowgraph and two-direction sensitivity Schlieren images in a single snapshot.
- Applied crosstalk correction to the shadowgraph images.
- Utilized Schlieren images for temperature field measurements.
Main Results:
- Successfully captured shadowgraph and Schlieren images simultaneously.
- Identified and corrected crosstalk effects in shadowgraph images.
- Achieved a temperature measurement resolution of approximately one degree Celsius.
- Demonstrated the capability of the optical system for fluid flow visualization and thermal analysis.
Conclusions:
- The developed optical system offers a streamlined approach to fluid flow analysis.
- Simultaneous acquisition of shadowgraph and Schlieren data is feasible with the proposed setup.
- The system provides quantitative temperature measurements with good resolution, valuable for thermal studies.
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