Television monitor display system

Particle size measurements were made using an UV-laser, shadow photographic technique. The particle sizing system displayed real-time droplet images onto a television monitor. The images (shadows) were obtained when a pulsed (30 times per second) UV-laser beam was directed through a spray scene onto a synchronized UV-sensitive vidicon camera/recorder. The narrow depth of field used by this system can record shadows from 300 in-focus droplets per second with a resolution down to approximately 0.3 /un in diameter. 

The first display systems were nothing more than fancy black-and-white TV monitors called CRTs (Cathode Ray Tubes). These displays were usually run from a video adapter that could also be connected to a television set. As computer technology developed, the demand for high-quality displays also developed. Soon after, technologies such as VGA, EGA, CGA, and XGA were developed and far outpaced the former CRT technology. However, each of these technologies uses some of the same concepts as the original CRT. 

Two other computer facilities are a data collection system which monitors remotely located data acquisition and experiment-control computers via asynchronous serial lines and the two Evans and Sutherland LDS-1 interactive graphics terminals. A PDP 10 included in the network configuration as an alternate file transport concentrator and auxiliary network development machine also performs the role of worker computer with the Evans and Sutherland display equipment. Other subnetworks have been designed for inclusion in the Octopus network to direct the on-line operation of LLL high-speed printer and microfilm recorder output facilities, to administer a second, expanded television monitor system providing 256 channels of video input for distribution to 512 additional monitors, and to control a CDC on-line tape library of 8.7 x 10 bits scheduled for delivery in 1975. The Computer Hardcopy Output Recording System (CHORS) concentrators are two Modcomp II computers, and TMDS-II will utilize two PDP 11/45s both subnetworks are to become operational during the... 

Since deadtimes in this type of spectrometer are quite long ( 60 fis), the system must normally operate with deadtime losses in the 10 to 60% range. Consequently, most multichannel analyzers are equipped with an electronic means of deadtime correction, such that the observed spectrum represents the true number of photons arriving at the detector during the period of data accumulation. In addition to the ability to display the spectrum on a cathode-ray tube or television monitor, the analyzer can usually drive an X-Y plotter to produce a permanent copy. Alternatively, the contents of the analyzer memory can be printed as the number of counts in each channel, listed by channel number. Most quantitative fluorescence spectrometers include a personal computer with approximately 2-6 megabytes of memory plus some form of mass storage. In such a system the computer may control specimen presentation, the excitation conditions, and data accumulation in the multichannel analyzer. At the end of data acquisition for each specimen the computer analyzes the spectrum in the multichannel analyzer, computes the raw element intensities, corrects for interelement effects, and computes the concentration of each element. 

Cathode ray tubes (CRTs) are almost universally used in colour televisions and still dominate in the display monitors of desktop computers. They are obviously not suitable for laptop PCs, because of bulk and weight, where currently liquid crystal displays are the systems of choice. Neither are they the most suitable technology for very large area displays, where other display techniques such as plasma panels and electroluminescent devices offer advantages. 

We have already addressed CRT s for television, including color, black white and color projection systems. Color display CRTs are used primarily as computer monitors. Here, the same rare earth phosphors are used as for color TV. Monochrome displays refers to CRT monitors where only one color screen is used for special purposes, as described in the last chapter. The following is a repeat of 6.6.6. given in the last chapter ... 

Evaluation of tracer on the skin surface was conducted with the VITAE system, following a protocol similar to that described elsewhere 3) The system quantifies fluorescence intensity in the following manner a television camera scans the surface area of a body part 30 times per second. A video digitizer in the computer takes one of these scans, converts the analog camera output to digital values on the basis of a 16 level grey scale, and displays the image on a TV monitor. The data is then stored on disk and is available for later analysis. 

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