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Topic: Angular aperture

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	Angular resolution - Wikipedia, the free encyclopedia
		Resolving power or minimum resolvable distance is the ability of the optical components of a microscope or telescope to measure the angular separation of the points in the object that is being viewed.
		The lens' aperture is a "hole" that is analogous to a two-dimensional version of the single-slit experiment; light passing through it interferes with itself, creating a ring-shaped diffraction pattern, known as the Airy pattern if the phase of the incident light is taken to be constant over the aperture.
		The highest angular resolutions can be achieved by arrays of telescopes called astronomical interferometers: these instruments can achieve angular resolutions of 0.001 arcsecond at optical wavelengths, and much higher resolutions at radio wavelengths.
	en.wikipedia.org /wiki/Angular_resolution (913 words)

	Encyclopedia :: encyclopedia : Angle (Site not responding. Last check: 2007-10-23)
		A rifle capable of shooting "1 MOA", one minute of arc, can place all shots within 1 inch at 100 yards, 2 inches at 200 yards, etc. Minutes of arc were also used in navigation, and a nautical mile is roughly defined as one minute of arc of the earth's surface.
		The grad, also called grade or gon, is an angular measure where the arc is divided by the circumference, and multiplied by 400.
		The modern format of angle used to indicate longitude or latitude is hemisphere degree minute.decimal, where there are 60 minutes in a degree, for instance N 51 23.438 or E 090 58.928.
	www.hallencyclopedia.com /Angle (1424 words)

	SPECIAL - Online Information article about SPECIAL
		The height of the pressure column, for each position of the aperture, gave the pressure at that point of the area struck by the jet.
		When the aperture was, caner e,ando..Li s.rterr/ ---r- Oian1:99--'---, =_ -- IYpter Level in Reserooir // • 1.0 o,s o o•s,•o Distance from axis of jet in inches.
		As the aperture moved away from the axis of the jet, the pressure diminished, and it became insensibly small at a distance from the axis of the jet about equal to the diameter of the jet.
	encyclopedia.jrank.org /SOU_STE/SPECIAL.html (6066 words)

	Articles - Resolving power (Site not responding. Last check: 2007-10-23)
		The lens´; aperture is a "hole" that is analogous to a two-dimensional version of the single-slit experiment; light passing through it interferes with itself, creating a ring-shaped diffraction pattern, known as the Airy pattern, that blurs the image.
		Since the spatial resolution is inversely proportional to D, this leads to the slightly surprising result that a wide beam of light may be focussed to a smaller spot than a narrow one.
		The highest angular resolutions can be achieved by arrays of telescopes called astronomical interferometers: these instruments can acheive angular resolutions of 0.001 arcsecond at optical wavelengths, and much higher resolutions at radio wavelengths.
	www.binocularscenter.com /articles/Resolving_power (897 words)

	Chip's CD Media Resource Center: CD-DA (Digital Audio) page 3
		x >= 0.61 lambda / (n sin theta) where x is the minimum distance separating two objects lamda is the wavelength of the illumination n is the index of refraction of the embedding medium theta is half the "angular aperture" of the lens.
		The term "n sin theta" is called the numeric aperture (NA), and is one of the standard optical parameters specified for microscope optics.
		Aperture: D = F/f where D is the aperture of the objective F is the focal length of the objective f is the f-number (f/) of the objective (from Tasso.html) Is this D the same as NA?
	www.chipchapin.com /CDMedia/cdda3.php3 (1255 words)

	FTP Index. Main Library Files (Site not responding. Last check: 2007-10-23)
		Improved and expanded G-Code generator from the article "Easy CNC Machining With GCG, by Matthew Evans.
		SECURE.C Code listing for the article "Home Security with PCM and The Parallel Port," by Jeff Stefan.
		TRAXAN.ZIP Unsupported freeware program to read a.PCB file and generate an aperture file.
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