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A VECTOR THEORY OF PHASE CONTRAST AND INTERFERENCE CONTRAST: V. INTERFERENCE CONTRAST
Author(s) -
Barer R.
Publication year - 1955
Publication title -
journal of the royal microscopical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0368-3974
DOI - 10.1111/j.1365-2818.1955.tb00404.x
Subject(s) - interference (communication) , contrast (vision) , phase (matter) , differential interference contrast microscopy , physics , optics , mathematics , computer science , telecommunications , quantum mechanics , channel (broadcasting) , microscopy
SYNOPSIS The vector representation of interference contrast is discussed and it is shown that it leads to results identical in principle with those of phase contrast. Any problem in interference contrast can be expressed in terms of an equivalent phase‐contrast system and vice versa. After analysing a number of special cases, a simple method of interconversion between phase and interference contrast is described. The effects of varying the phase and amplitude controls of an interference contrast system are discussed in terms of the characteristics of the equivalent phase‐contrast system. It is shown that one of the most important advantages of interference contrast is that it enables Richter's condition to be obtained quite simply by making the two interfering beams equal in intensity. This enables any phase detail to be made perfectly black and is useful for quantitative measurements of phase change.