Parabolic reflector

About: Parabolic reflector is a research topic. Over the lifetime, 3375 publications have been published within this topic receiving 30735 citations. The topic is also known as: paraboloid reflector & paraboloidal reflector.

Wide angle beam pattern lamp

Abstract: A vehicular warning light has multiple segments of concave parabolic reflectors assembled for cooperative spreading of the light emitted from a single electric lamp to form an elongated wide angle beam of light in a horizontal plane for alerting the neighborhood to the presence and movement of the emergency vehicle. The axis of revolution of each parabolic reflector is assembled at a differing azimuth angle within the common horizontal plane and the focal points and focal planes of the respective reflectors are dispersed. The equivalent center point of the single light source is therefore defocused relative to at least some of the reflectors. The axis of the elongated light source is centered on the common horizontal plane and is parallel to the fluted light cover lens which is contoured for efficiency in light transmission from the multiple reflectors and for additional spreading and luminous uniformity.

Lighting arrangement for photographic work including combined spot and flood light luminaire

Abstract: A luminaire includes a rectangular casing having side walls extending forwardly from a rear wall. A hand grip is adjustably secured to one side wall so that the casing can be held in one hand of a user, and a shaft is rotatably mounted in the casing and projects outwardly through such one side wall. A handle is secured to the projecting end of the shaft, adjacent the hand grip. A lamp socket is mounted on the shaft intermediate its ends and a lamp is mounted upright in the socket. A reflector assembly is interchangeably mounted in the casing and includes a small diameter inner parabolic reflector, a large diameter outer parabolic reflector coaxial with the inner reflector, and a transition zone interconnecting the reflectors. The reflector assembly has a relative elongated slot therein receiving the lamp socket for swinging of the upright lamp, about the axis of the shaft by operation of the handle, between an inner position, in which the lamp, in cooperation with the inner parabolic reflector, provides a "broad" or "wide angle" flood light, and an outer position in which the lamp, in cooperation with the inner and outer parabolic reflectors, which have different focal lengths, provides a concentrated spot light.

Automatic Satellite Tracking System

Abstract: A satellite tracking system for tracking a synchronous satellite includes a satellite antenna system movably supported on a roof of a vehicle via a roof frame to move between an operation position and a folded position. At the operation position, the satellite antenna system is rotated on the roof frame to adjust a horizontal orientation of a parabolic reflector of the satellite antenna system while the parabolic reflector is pivotally lift at a predetermined inclination angle to align with the satellite. At the folded position, the parabolic reflector is pivotally dropped down until the parabolic reflector faces downwardly to the roof of the vehicle to conceal a signal transmitting device of the satellite antenna system between the parabolic reflector and the roof of the vehicle. Therefore, the satellite antenna system provides a relatively low profile at the folded position when the vehicle travels.

Efficient computation of the far field of parabolic reflectors by pseudo-sampling algorithm

Abstract: The newly developed pseudo-sampling representation is applied for computing the far field of an offset parabolic reflector with a cluster feed illumination. A new comb-type fast Fourier transform (FFT) algorithm is used in a computer program. Both precision and computational time are analyzed, demonstrating the excellent performance of the method.

A gas detector

Abstract: A Gas detector comprises a first source (21) of infra-red radiation which is placed at the focal point of a first off-axis reflector (23). A second source (22) of infra-red radiation is placed at the focal point of a second off-axis parabolic reflector (24). The two collimated beams from the sources are combined by a beam-combining filter (26). The combined beams are split by beam splitter (27) so that part passes to a compensation detector (29) and part is passed through a sample of gases which are being examined. A retro-reflector (32) returns the gas along the same path (31) through the beam splitter (27) and onto a measuring detector (34). A band pass filter (25) is placed in the path of radiation from the first source (21) to allow the transmission of a narrow band of infra-red radiation which exhibits absorbtion by the gas to be detected. The beam-splitting filter (26) allows a waveband of infra-red radiation to pass which exhibits less absorbtion by the gas to be detected. The relative intensities of the components of the combined beam emerging from the sample are examined by the sensor (34) to produce an indication of whether the gas to be detected is present in the sample. The components of the optical system are housed in a moulded substrate and the mountings for the optical elements are provided on the substrate.