Pressure-Sensitive Paint with Imprinted Pattern for Full-Field Endoscopic Measurement Using a Color Camera

Publication date: Available online 9 March 2019Source: Sensors and Actuators A: PhysicalAuthor(s): Di Peng, Zhe Zhong, Feng Gu, Wenwu Zhou, Fei Qi, Yingzheng LiuAbstractAn endoscopic system for pressure-sensitive paint (PSP) measurement was presented in the current study, which was composed of a fiberscope, a diode laser and a color camera. The fiberscope was integrated by optical fibers (for transmitting the laser excitation) and a set of lenses (for delivering the PSP images to the camera). Here, a unique PSP with imprinted pattern was developed to address the key issue of limited viewing angle/area encountered during endoscopic measurement. This coating was based on a pressure-sensing luminophore PtTFPP and a recently developed mesoporous-particle binder, but with the addition of a pressure-insensitive reference dye (coumarin 6) forming a random dot pattern. The emission of PtTFPP and reference dye matched with the red and green channels of the color camera, respectively. The randomly distributed dots provided highly distinguishable features required for image stitching operation. This allowed the establishment of image processing algorithms that could combine a series of PSP images (scanned over the measurement field) into a full-field image. Meanwhile, the issue of spectral leakage from the emission of reference dye into the red channel was identified, and a correction method was proposed to remove the related measurement error. This PSP along with the endoscopic system ...
Source: Sensors and Actuators A: Physical - Category: Physics Source Type: research