achromatic

Definitions

  • Achromatic Lens
    Achromatic Lens
  • WordNet 3.6
    • adj achromatic having no hue "neutral colors like black or white"
    • ***
Webster's Revised Unabridged Dictionary
    • Achromatic (Opt) Free from color; transmitting light without decomposing it into its primary colors.
    • Achromatic (Biol) Uncolored; not absorbing color from a fluid; -- said of tissue.
    • ***
Century Dictionary and Cyclopedia
    • achromatic Destitute of color; free from coloration; transmitting light without decomposing it into its constituent colors: as, an achromatic lens or telescope.
    • achromatic In biology: Colorless; hyaline. Difficult to stain: a term applied to the portion of the cell-nucleus which exhibits little or no tendency to stain in carmine, hæmatoxylin, or certain aniline dyes used in histologic and cytologic technic.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Achromatic a-krōm-at′ik transmitting light without colour, of a lens or telescope
    • ***

Etymology

Webster's Revised Unabridged Dictionary
Gr. colorless; 'a priv. + , , color: cf. F. achromatique,
Chambers's Twentieth Century Dictionary
Gr. a, neg., and chrōma, chromatos, colour.

Usage

In literature:

PORTRAIT LENSES of double Achromatic combination, from 1l.
"Notes and Queries, Number 219, January 7, 1854" by Various
Within seventeen days of its identification with the Berlin achromatic, Neptune was found to be attended by a satellite.
"A Popular History of Astronomy During the Nineteenth Century" by Agnes M. (Agnes Mary) Clerke
ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the Academy of Sciences in Paris.
"Notes and Queries, Number 193, July 9, 1853" by Various
ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the Academy of Sciences in Paris.
"Notes and Queries, Number 194, July 16, 1853" by Various
ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the Academy of Sciences in Paris.
"Notes and Queries, Number 195, July 23, 1853" by Various
PORTRAIT LENSES of double Achromatic combination, from 1l.
"Notes and Queries, Number 218, December 31, 1853" by Various
PORTRAIT LENSES of double Achromatic combination, from 1l.
"Notes and Queries, Number 217, December 24, 1853" by Various
On Some Properties in Achromatic Object Glasses Applicable to the Improvement of the Microscope, in Phil.
"A History of Science, Volume 5(of 5)" by Henry Smith Williams
PORTRAIT LENSES of double Achromatic combination, from 1l.
"Notes and Queries, Number 216, December 17, 1853" by Various
A similar argument may be applied to find at what point an achromatic lens becomes sensibly superior to a single one.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4" by Various
This conclusion was proved to be erroneous when Chester M. Hall in 1733 constructed achromatic lenses.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
Leonhard Euler in 1747 had suggested that achromatism might be obtained by the combination of glass and water lenses.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6" by Various
Lens, regular, meniscus achromatic, 3-inch focus.
"Kodaks and Kodak Supplies, 1914" by Canadian Kodak Company
Achromatic and other lenses were known, and the microscope, the telescope and spectacles.
"Inventions in the Century" by William Henry Doolittle
J. Dolland, London, first made double achromatic compound lenses.
"The Evolution of Photography" by John Werge
This was applied to an excellent achromatic telescope of 3(1/4) in.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2" by Various
The bands are then achromatic in the sense that the ordinary telescope is so.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6" by Various
These phenomena are fully explained by the imperfect achromatism of the eye.
"Curiosities of Light and Sight" by Shelford Bidwell
He also succeeded in constructing an almost perfectly achromatic eye-piece, still known by his name.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 1" by Various
In 1733 Chester More Hall invented the achromatic object glass of crown and flint glass.
"The Progress of Invention in the Nineteenth Century." by Edward W. Byrn
***

In news:

The achromatic tone is available in a variety of hues and looks great in just about every room in the house.
***

In science:

Remarkably, the microlensed afterglow may have been already observed in the light curve of GRB 000301C as the achromatic bump (Garnavich, Loeb & Stanek 2000; Gaudi, Granot & Loeb 2001; but see also Panaitescu 2001).
Microlensing of collimated Gamma-Ray Burst afterglows
If the edge of the image crosses the lens before the break time, the microlensing signal appears as an achromatic amplification peak in the light curve (Loeb & Perna 1998).
Microlensing of collimated Gamma-Ray Burst afterglows
N∗ is the number of stars monitored for a duration Tobs , and ǫ(tE ) is the overall detection efficiency for events with timescale tE .2 Finally, when blending is negligible or is due to a star with the same colour as that being microlensed, microlensing is achromatic.
The Galactic Halo from Microlensing
The resulting light curve is symmetric about t0 , and achromatic (i.e. has the same shape in every wavelength).
Stars and singularities: Stellar phenomena near a massive black hole
Now consider the typical microlensing event; although the lens is achromatic, from equation (20) we see that the amplitude of the closure phase signal is inversely proportional to the cube of the wavelength.
Bringing closure to microlensing mass measurement
The achromatic steepening of the optical light curve and early radio flux decay of some GRBs are inconsistent with simple spherical expansion, and well fit by jet evolution.
Microquasars as sources of high energy phenomena
The lenses are assumed to be achromatic to ensure a common focus for the collimated beams at different wavelengths.
Ultracold atomic Fermi-Bose mixtures in bichromatic optical dipole traps: a novel route to study fermion superfluidity
For stellar and lunar observations, a Dollond achromatic refractor and a Bird reflector were used.
The History of Astrophysics in Antarctica
However, the achromaticity of the lightcurve only holds good if the source star is resolved and the lens is dark.
RIP: The Macho Era (1974-2004)
Performance of a selection of commercially available achromatic doublet lenses (Comar DQ series and Newport VALUMAX r(cid:13) lenses).
Testing and design of a lens system for atom trapping and fluorescence detection
Fig. 1 shows the limitations of achromatic doublets for our needs.
Testing and design of a lens system for atom trapping and fluorescence detection
An observational fact that supports the collimation model is an achromatic break in the power law slope of the light curves.
Gamma-Ray Bursts, Collisionless Shocks and Synthetic Spectra
The two beams from the Wollaston traversed a holographic diffraction grating (Kaiser, HFG 550) and were imaged onto a Peltiercooled CCD camera using an achromatic lens. A spectral resolution of about ∼ 1 nm was readily achieved.
Measurement of the complex dielectric constant of a single gold nanoparticle
To address possible beam-line asymmetries, the polarity of the beam achromat that setup was regularly exchanged.
Kaons: Review and Outlook
The jet opening angle can be obtained form the observer time tj at which the flux Fν decay rate achromatically changes to a steeper value, assuming that this corresponds to the causal (light-cone) angle Γ(t)−1 having become comparable to (and later larger than) the jet half-angle θj [408].
Gamma-Ray Bursts
***