研究目的
The problem of measuring spatial temperature distribution over the surface of hard-to-reach objects with a non-uniform emissivity distribution is considered.
研究成果
The AOTF-based spectral imaging system can be used for precise high-temperature measurements of hard-to-reach objects using conventional rigid borescopes, making it effective for non-destructive testing of industrial high-temperature equipment.
研究不足
The diameter of the entrance pupil is larger than standard endoscopes, and the angular aperture is smaller, which may cause vignetting and energy loss without an optical coupler. The system requires high-quality optical components to minimize aberrations and avoid the need for refocusing during spectral tuning.
1：Experimental Design and Method Selection:
The study uses an acousto-optical spectral imaging system for non-contact temperature measurements. It involves an acousto-optic tunable filter (AOTF) to enable precise spectral imaging in narrow bands.
2：Sample Selection and Data Sources:
A tungsten filament lamp is used as a heated object, heated by a constant current from a stabilized current source, simulating industrial conditions.
3：List of Experimental Equipment and Materials:
Includes a rigid endoscopic probe, coupling optical system (Kepler telescope with magnification
4：4x), AOTF with TeO2 crystal, Allied Vision Manta G-145 camera, lens with 80 mm focal length, and a 150 W halogen lamp for illumination. Experimental Procedures and Operational Workflow:
Radiation from the heated object is transmitted through the endoscopic probe, coupling system, and AOTF, then focused onto the camera sensor. Spectral images are captured and processed.
5：Data Analysis Methods:
Spectral data in each pixel is processed using algorithms based on Planck's blackbody equation and Wien's approximation to calculate temperature and emissivity through least squares fitting.
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Allied Vision Manta G-145 camera
Manta G-145
Allied Vision
To register the radiation of the lamp with a 16-bit dynamic range, capturing images at 30 frames per second and resolution 1388×1038 pixels.
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acousto-optic tunable filter
Acts as a spectral imaging element to enable precise non-contact temperature measurements and contrast visualization in arbitrary narrow spectral bands.
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rigid borescope
Used as an endoscopic probe to transmit radiation from hard-to-reach objects for inspection and temperature measurement.
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lens
Forms an image of the heated object on the camera sensor, with a focal length of 80 mm.
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halogen lamp
Provides external wide-band illumination for obtaining spectral images of test-charts.
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stabilized current source
Heats the tungsten filament by providing a constant current.
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