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pro vyhledávání: '"William T. Plummer"'
Autor:
William T. Plummer
Publikováno v:
9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies.
Freeform optics are lenses or mirrors with surfaces having no rotational symmetry. They were conceived more than a century ago, but have recently received new attention for solving design problems. The special methods needed to manufacture them have
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::05b098bdafa84a1e4eb6380982c8eeb9
https://doi.org/10.1117/12.2505172
https://doi.org/10.1117/12.2505172
Publikováno v:
SPIE Proceedings.
High density digital sensors combined with "digital zooming" have eliminated the need for many small magnification range zoom lenses. Instead, lens designers now must design and assess zoom lenses for ever-increasing magnification ranges. The number
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2b941e81b42f4c357d8cf8419b25db37
https://doi.org/10.1117/12.930616
https://doi.org/10.1117/12.930616
Autor:
William T. Plummer, Leo R. Gardner
Publikováno v:
Applied optics. 31(31)
A visually striking image phenomenon has been noticed during mechanical abrasion of a plane nickel optical surface. After the lap was removed and the surface was cleaned, two clear ghost images of the absent lap were visible in full detail, in each o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b4047cfe097d9cf5b4c2a7c279f25c0
https://pubmed.ncbi.nlm.nih.gov/20733877
https://pubmed.ncbi.nlm.nih.gov/20733877
Autor:
William T. Plummer
Publikováno v:
Applied optics. 16(7)
An efficient photographic shutter is one which can open and close in small fractions of the exposure time, and this property is generally thought desirable. But no one combination of f/stop and time in an efficient shutter can match the subjective qu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ed2bcc2d796d8897161b5dba31e4498
https://pubmed.ncbi.nlm.nih.gov/20168834
https://pubmed.ncbi.nlm.nih.gov/20168834
Autor:
William T. Plummer
Publikováno v:
Applied optics. 15(3)
Monitoring of high-volume lens manufacture for Polaroid Land photography requires an acceptance criterion that is both relevant to picture quality and suitable for automatic testing. In a hardware test based upon the modulation transfer function (MTF
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bfd64c7f06c5b386d4855eb7f0645ca5
https://pubmed.ncbi.nlm.nih.gov/20165062
https://pubmed.ncbi.nlm.nih.gov/20165062
Autor:
William T. Plummer
Publikováno v:
Applied optics. 14(11)
Ground glass used for camera focus screens often has far from optimum diffusion properties. An analysis of the function of the focus screen shows that a screen with random (Gaussian) diffusion properties can be constructed with both brightness and fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46fe2da3e6a9578b60ef1830a2fc91c0
https://pubmed.ncbi.nlm.nih.gov/20155099
https://pubmed.ncbi.nlm.nih.gov/20155099
Autor:
William T. Plummer
Publikováno v:
Applied optics. 8(10)
Reflection spectra are presented for artificial cumulus clouds with a progression of droplet sizes, including sizes common in natural clouds, over the wavelength range from 1.0 micro to 2.4 micro. A correction is made for gaseous absorption. The spec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c49246d0466f69a845e3a0f8c51203e
https://pubmed.ncbi.nlm.nih.gov/20072579
https://pubmed.ncbi.nlm.nih.gov/20072579
Publikováno v:
Applied optics. 38(16)
Sections of nonrotational aspheric surfaces can be useful in a variety of optical situations. In several examples, image-forming objectives, as for photographic or electronic camera products, are described in which suitably located asymmetric pairs o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a68727b12d874c1aa822dbb097a696b
https://pubmed.ncbi.nlm.nih.gov/18319960
https://pubmed.ncbi.nlm.nih.gov/18319960
Autor:
William T. Plummer
Publikováno v:
SPIE Proceedings.
In the period from 1973 through 1992, Polaroid introduced six different free-form aspheric optical surfaces in some unusually innovative instant photographic cameras, made in the millions. In each case these peculiar components were used to solve unu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38773c53f947f19e392723e19fa33208
https://doi.org/10.1117/12.623875
https://doi.org/10.1117/12.623875