Definition of Double image micrometer. Meaning of Double image micrometer. Synonyms of Double image micrometer

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Definition of Double image micrometer

Double image micrometer
Micrometer Mi*crom"e*ter, n. [Micro- + -meter: cf. F. microm[`e]tre.] An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass. Circular, or Ring, micrometer, a metallic ring fixed in the focus of the object glass of a telescope, and used to determine differences of right ascension and declination between stars by observations of the times at which the stars cross the inner or outer periphery of the ring. Double image micrometer, a micrometer in which two images of an object are formed in the field, usually by the two halves of a bisected lens which are movable along their line of section by a screw, and distances are determined by the number of screw revolutions necessary to bring the points to be measured into optical coincidence. When the two images are formed by a bisected object glass, it is called a divided-object-glass micrometer, and when the instrument is large and equatorially mounted, it is known as a heliometer. Double refraction micrometer, a species of double image micrometer, in which the two images are formed by the double refraction of rock crystal. Filar, or Bifilar, micrometer. See under Bifilar. Micrometer caliper or gauge (Mech.), a caliper or gauge with a micrometer screw, for measuring dimensions with great accuracy. Micrometer head, the head of a micrometer screw. Micrometer microscope, a compound microscope combined with a filar micrometer, used chiefly for reading and subdividing the divisions of large astronomical and geodetical instruments. Micrometer screw, a screw with a graduated head used in some forms of micrometers. Position micrometer. See under Position. Scale, or Linear, micrometer, a minute and very delicately graduated scale of equal parts used in the field of a telescope or microscope, for measuring distances by direct comparison.

Meaning of Double image micrometer from wikipedia

- magnification of a telescope. It is usually a double-image micrometer used to measure the diameter of the image of the object gl****. The magnifying power...
- million pixel image sensor. The 200MP ISOCELL HP3 has 0.56 micrometer pixels with Samsung reporting that previous sensors had 0.64 micrometer pixels, a 12%...
- Lee SC, Kim K, Kim J, Lee S, Han Yi J, Kim SW, et al. (June 2001). "One micrometer resolution NMR microscopy". Journal of Magnetic Resonance. 150 (2): 207–13...
- placed in the focal image plane of the eyepiece so they remain sharply superimposed over the object under observation, while the micrometer motion moves the...
- Mlynek performed the classic Young's double slit experiment with metastable helium atoms p****ing through micrometer-scale slits in gold foil. In 1999, a...
- Sectional Proceedings. 1854 On Radiant Heat—Third Report. 1845 On a Double Image Micrometer. 1847 On Luminous Rings, &c. 1849 On Irradiation. (In Royal Astronomical...
- telescope's optical path so as to produce a double image. If one element is moved using a **** micrometer, precise angle measurements can be made. The...
- Jupiter using a filar micrometer, and also a double-image micrometer. Between 1960 and 1963 over 1300 observations of 233 double stars were conducted with...
- term "caliper" is often used in contradistinction to micrometer, even though outside micrometers are technically a form of caliper. In this usage, caliper...
- unwanted artifacts. They are also sometimes created deliberately; in micrometers, they are used to amplify the effects of very small movements. In physics...