Word: infra
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
From Apollo's infra-red pictures, for example, scientists will be able to distinguish the location of diseased vegetation in areas of healthy growth. On film recording only green light, which best penetrates water, they will be able to see the bottom contours of rivers, lakes and shallow coastal waters...
...fumaroles (from the Latin word fumariolum; meaning smokehole), and the simplest way to prospect for this geothermal energy is to look for such vaporous leaks in the earth's crust. But in areas where the energy remains trapped underground, geologists must use more sophisticated techniques. One method employs infra-red aerial photography. Since the infra-red film is sensitive to heat, geothermal areas are likely to show up lighter in the picture. Another method measures the earth's electrical conductivity, which increases with the presence of subsurface hot water. To tap the subterranean energy, engineers drill with standard...
...lighting. The Army is experimenting with laser television for secret nighttime surveillance from aircraft, and military planners are developing bomb warheads that seek out targets illuminated by invisible infra-red laser beams. Peeling Potatoes. The various laser wave lengths, about 1,000 times shorter than those of the microwaves used in conventional radar, make laser altimeters, range finders and aerial mappers remarkably accurate. In a demonstration of a laser distance-measuring device, Spectra-Physics, Inc. flew the instrument over a Philadelphia high school stadium at an altitude of 1,000 ft. A conventional radar altimeter would have indicated only...
Suspicious Ladder. Each Phantom carries anywhere from three to nine cameras, including infra-red equipment, as well as side-looking radar, all linked to the aircraft's navigational gear in order to record precise locations-and trip the camera shutters at just the right millisecond. On return to Udorn, automatic machines swiftly process the film in trailers set up beside the runway, and highly skilled (and suspicious) photo interpreters, or PIs, scan it for hours, looking for the smallest telltale detail: a ladder left at a cave entrance, a small dot of light that might be a campfire, vehicle...
Last week the Army finally revealed some of the technical wizardry that makes the scopes work. Unlike the World War II infantry sniperscope that illuminated its target with an infra-red beam, the starlight scope needs no light of its own. Thus it is undetectable by enemy sensors. It uses only natural light, no matter how dim-moonlight, starlight, even the faint luminescence of decaying jungle foliage. Capable of amplifying light up to 40,000 times, it literally treats the darkest night...