An approach to measure a high-dynamic two-dimensional(2 D) temperature field using a high-speed quadriwave lateral shearing interferometer(QWLSI) is proposed. The detailed theoretical derivation to express the wavefro...An approach to measure a high-dynamic two-dimensional(2 D) temperature field using a high-speed quadriwave lateral shearing interferometer(QWLSI) is proposed. The detailed theoretical derivation to express the wavefront reconstruct principle of the proposed method is presented. The comparison experiment with thermocouples shows that the temperature field measurement using QWLSI has a precision of ±0.5 °C. An experiment for measuring the highdynamic temperature field generated by an electrical heater is carried out. A 200 frame rate temperature field video with 512 × 512 resolution is obtained finally. Experimental results show that the temperature field measurement system using a QWLSI has the advantage of high sensitivity and high resolution.展开更多
In contrast to traditional physical measurement methods,machine-learning-based precision measurement is a“datadriven”approach that constitutes a new field of research.We report a machine-learning-based precision mea...In contrast to traditional physical measurement methods,machine-learning-based precision measurement is a“datadriven”approach that constitutes a new field of research.We report a machine-learning-based precision measurement of a rotational angle from a vortex-mode shear interferometer,as the two-dimensional optical images at different angles contain the interference patterns that are inherently encoded into the light orbital angular momentum states.Through our evaluation of different convolutional neural networks,we have determined that the ResNeXt50 model excels in detecting minute angle changes across resolutions of 0.05°,0.1°,0.5°,4°,and 10°.This model for the vortex beams achieves over 99.9%accuracy for resolutions of 0.1°,0.5°,4°,and 10°,and over 97.0%accuracy for the highest 0.05°resolution.The new results in experiments and modeling demonstrate a robust,accurate,and scalable approach to high-precision rotational angle measurement.展开更多
基金supported by the National Natural Science Foundation of China(No.11603024)
文摘An approach to measure a high-dynamic two-dimensional(2 D) temperature field using a high-speed quadriwave lateral shearing interferometer(QWLSI) is proposed. The detailed theoretical derivation to express the wavefront reconstruct principle of the proposed method is presented. The comparison experiment with thermocouples shows that the temperature field measurement using QWLSI has a precision of ±0.5 °C. An experiment for measuring the highdynamic temperature field generated by an electrical heater is carried out. A 200 frame rate temperature field video with 512 × 512 resolution is obtained finally. Experimental results show that the temperature field measurement system using a QWLSI has the advantage of high sensitivity and high resolution.
基金supported by the National Natural Science Foundation of China(Nos.12174115,12274134,and 12192251)the National Key R&D Program of China(No.2019YFA0705000)。
文摘In contrast to traditional physical measurement methods,machine-learning-based precision measurement is a“datadriven”approach that constitutes a new field of research.We report a machine-learning-based precision measurement of a rotational angle from a vortex-mode shear interferometer,as the two-dimensional optical images at different angles contain the interference patterns that are inherently encoded into the light orbital angular momentum states.Through our evaluation of different convolutional neural networks,we have determined that the ResNeXt50 model excels in detecting minute angle changes across resolutions of 0.05°,0.1°,0.5°,4°,and 10°.This model for the vortex beams achieves over 99.9%accuracy for resolutions of 0.1°,0.5°,4°,and 10°,and over 97.0%accuracy for the highest 0.05°resolution.The new results in experiments and modeling demonstrate a robust,accurate,and scalable approach to high-precision rotational angle measurement.
