Immersion System

Immersion System

 

an optical system in which the space between the object and the first lens is filled with an immersion fluid (see Figure 1). Immersion systems are used in microscopes. Cedar or mineral oil (with an index of refraction of 1.515), a solution of glycerin in water (1.434), water (1.333), monobromonaphthalene (1.656), vaseline oil (1.503), and methylene iodide (1.741) are used as immersion fluids.

Figure 1

The optical characteristics of an immersion fluid (dispersion and index of refraction) are taken into account in the design of the immersion system; therefore, such a system may be used only with the fluid for which it was designed. Otherwise the image quality will deteriorate sharply. The inclusion of lens in an immersion system provides the possibility of increasing its aperture A and consequently the resolution of the microscope. A “dry” system cannot have A > 1, and A is as high as 1.3 in oil immersion systems and to 1.6 in a monobromonaphthalene system. In an immersion system light diffusion is reduced, and the image contrast is thus increased. This is especially important for the investigation of poorly reflecting objects.

Immersion systems make possible the study of objects that lie at different depths in the immersion fluid by immersing the lens in it. For example, microorganisms can be observed in water with a lens designed for immersion in water.

L. A. FEDIN

Mentioned in ?
References in periodicals archive ?
This result can be explained because the temporary immersion system provides a highly aerobic system for the plant growth, as there is forced ventilation through the vessel lid, however the immersion times, the duration and frequency of the immersion are the most decisive parameter for a successful micro-propagation (BERTHOULY; ETIENNE, 2002; WATT, 2012), as they influence nutrient and water uptake and consequently hyperhydricity of the cultured material.
Enhancing Communication For Individuals With Autism: A Guide to the Visual Immersion System
US-based Midas Green Technologies is showcasing its proprietary Data Center Immersion System, Midas XCI at the Gitex technology week between October 12 and 16.
2004), working with different Crescentia cujete growth systems, reported that a bigger growth of the root system was observed in temporary immersion system when compared to the micropropagation in solid and liquid media.
Ni Chasaide and Regan do an excellent job at comparing the French immersion system in Canada with the gaelscoileanna (Irish immersion schools) while appreciating the different contexts and spaces that each language occupies as the other official language.
developed a tank immersion system for profiles, reportedly capable of 60-sec color changes.
Stephen Caseley, managing director at eaga Renewables, said: "We chose St Chad's because it is very much representative of the average school in the North East, and given that they use an immersion system, we saw an immediate opportunity to make significant costsavings and carbon reductions, with minimum inconvenience to the school.
The housing block's water heating immersion system and all the thermostats were checked.
El Pais, now backing the losing socialists, picked up the slack, giving a lot of press to Foro Babel, a Barcelona-based intellectual group that believes the immersion system violates civil rights.
The nitrogen immersion system quick-freezes a crust around the shrimp, and then the product continues to the mechanical freezer, where the freezing is completed.
The majority of California citizens want our schools to teach English using the immersion system.