The image in which the values of the frequency obtained by a raster scan along the x-y direction of the sample surface are plotted against the x-y coordination of each measurement point is called a constant-height image.
22.
In some systems, such as the Digital Light Processing ( DLP ) system, there is no flying spot or raster scan at all, so there is no flicker other than that generated by the temporal aliasing of the film image capture.
23.
A laser beam ( laser writer ) or a beam of electrons ( e-beam writer ) is used to expose the pattern defined by the data file and travels over the surface of the substrate in either a vector or raster scan manner.
24.
So, the energy to keep the oscillators and raster scan going, dies pretty quickly but the hot'gun'still emits enough electron, with at a high enough potential between cathode and anode to excite the phosphorus at the centre of the screen.
25.
Since it is easy to deflect the beam by means of electro-magnets in a transverse direction, it is possible to employ a raster scan method, i . e ., to scan the target area quickly like the electron beam scans a TV tube.
26.
In analog TV, originally it was too costly to create a simple sequential raster scan of the type just described with a fast-enough refresh rate and sufficient horizontal resolution, although the French 819-line system had better definition than other standards of its time.
27.
The presentation at SigGraph a few years ago included a comment from the author that it is possible that the light from a TV screen or computer monitor might suffice to perform this trick-since the raster scan produces light that moves relative to the scene ( albeit very quickly ).
28.
Interlace is still used for most standard definition TVs, and the 1080i DLP ), or plasma displays; these displays do not use a raster scan to create an image, and so cannot benefit from interlacing : in practice, they have to be driven with a progressive scan signal.
29.
On the other hand, the df may be kept constant by moving the probe upward and downward ( See ( 3 ) of FIG . 5 ) in z-direction using a negative feedback ( by using z-feedback loop ) while the raster scan of the sample surface along the x-y direction.
30.
This work commenced around 1982-6 using raster scan, ( green ) monitors to visualise the programming, each known as workstations, ( since the'intelligence'was built into the desk, not the monitor ) and the CAD CAM programs were still printed out on punched paper to be transferred in some cases into onboard RAM and in others read and implemented sequentially.
