281 results about "Secondary radiation" patented technology

A light source, having at least one LED for emitting a primary radiation and at least one luminescence conversion body having at least one luminescent material for converting the primary radiation into a secondary radiation. The luminescence conversion body is a polycrystalline ceramic body which itself acts partly or completely as luminescent material by virtue of at least part of the base material which forms the ceramic body being activated by a dopant.

An aircraft antenna includes an aerodynamic housing structured for attachment to an outer surface of an aircraft, and the housing contains an electromagnetic radiator and tuned over a first band of frequencies potentially to produce secondary radiations in at least a second band of frequencies, and a suppression filter effective at the frequencies of the secondary radiations.

Inventions related to the intra-vision means, designed for production of visually sensed images of the internal structure of an object, in particular, of a biological object, are aimed at higher accuracy of determining the relative density indices of the object's substance in the obtained image together with avoiding complex and expensive engineering; when used for diagnostic purposes in medicine, the dosage of tissues surrounding those that are examined is decreased. X-rays from source 1 is concentrated (for example, using X-ray lens 2) in the zone that includes the current point 4, to which the measurement results are attributed and which is located within the target area 7 of the object 5. Excited in this zone secondary scattered radiation (Compton, fluorescent) is transported (for example, using X-ray lens 3) to one or more detectors 6. By moving the said zone, the target area 7 of object 5 is scanned, and based upon population of the intensity values of the secondary radiation, which are obtained with the help of one or more detectors 6 and which are determined concurrently with coordinates of the current point 6, judgment on the density of the object's substance in this point is made. Density values together with respective coordinate values obtained using sensors 11 are used in the means 12 for data processing and imaging to build up a picture of substance density distribution in the target area of the object.

A patterned-media magnetic recording disk drive uses an optical system for clocking the write data and a patterned-media disk that has discrete magnetizable data islands with nonmagnetic spaces between the islands, wherein the nonmagnetic spaces contain optical contrast material. The optical contrast material may be optically absorptive material, fluorescent material, or a metal layer that generates surface plasmons when excited by radiation of a specific wavelength. Radiation from a primary radiation source is directed to a near-field transducer maintained near the disk surface and a radiation detector detects radiation reflected back from the transducer. If the disk has fluorescent material or a metal layer in the nonmagnetic spaces, then a secondary radiation source irradiates the fluorescent material or metal layer with radiation of a specific wavelength to cause the fluorescent material to emit radiation or the metal layer to generate surface plasmons. As the disk rotates, reflected optical power from the transducer varies depending on whether an island or space is under the transducer. The output signal from the radiation detector output controls the write clock.