What does "dark field" mean?

Just like in the dark field method, phase objects can be seen at this time.

Dark field observation method

Inclined dark field illumination

Dark field electronic image

For the requirements of astronomical measurement, it is suggested to calibrate the dark field map and the flat field map.

The software will display a dialog box in which you can select the darkfield picture to load.

This paper introduces a new method based on phase conflict diagram generation and processing, which can accurately and comprehensively check the standard cell layout (dark field) designed by traditional methods.

In the second part, aiming at the problem that the layout designed by traditional methods can't meet the requirements of alternating phase shift mask, a manufacturability verification and design algorithm of alternating phase shift mask based on standard cells is introduced, including dark field and bright field layout algorithms.

Li Yinmei's research group of Chinese University of Science and Technology put forward the idea of combining the technology of observing light scattering with optical tweezers. Coupling a sheet laser beam into the optical tweezers system of a traditional optical microscope, irradiating the sample from the side, so that the scattered light of particles in the sample is imaged by the microscope at a specific laser incidence position; It overcomes the technical key that the trap position of optical tweezers strictly coincides with the microscopic imaging plane and the laser irradiation plane. Optical tweezers can capture 100 nanometer polystyrene balls and observe nanoparticles in the whole microscopic field of view, so as to achieve the purpose of capturing nanoparticles and observing nanoparticles at the same time.

It is difficult to make sentences in the dark field, which is a common way to make sentences.