Reflector (antenna)

About: Reflector (antenna) is a research topic. Over the lifetime, 28730 publications have been published within this topic receiving 212618 citations.

An image projector and optical assembly

Abstract: An image projector (2, 2b, 2c) comprising, a light source (4) for providing a light beam (5); a MEMS mirror (6) which is arranged such that it can receive the light beam (5), and which can oscillate about at least one oscillation axis (7a, b) to scan said light beam (5); one or more multiple-beam-generators (8, 80, 41, 61, 62) each of the one or more multiple-beam-generators comprising, a planar beam splitter (9) which is arranged to receive the light beam (5) reflected by the MEMS mirror (6), and a planar reflector (10) which can receive the part of the light beam (5) which is transmitted through the planar beam splitter (9), so that each of the one or more multiple-beam-generators (8, 80, 41 ) can generated multiple beams (15a-c), and wherein the planar beam splitter (9) and planar reflector (10) are arranged to be in parallel; and a focusing lens (11) which is arranged to receive multiple beams (15a-c) which are generated by the one or more multiple-beam-generators (8, 80, 41, 61,62); wherein, in each of the one or more multiple-beam-generators (8, 80, 41, 61,62), the distance (h) between the planar beam splitter (9) and planar reflector (10) is such that the optical distance (OD) between the planar beam splitter (9) and planar reflector (10) is greater than, or equal to, half the coherent length of the light beam (5). There is further provided an optical assembly (1, 20, 30, 40, 60) comprising such an image projector.

Radiation sensor for monitoring a body condition

Abstract: An electromagnetic sensor including an emitter (12, 18), a detector (14, 36) and a reflector (26). The emitter is on the upper portion of a housing (10) and the detector is in the lower portion of the housing. The emitter faces the opposite direction from the detector. The sensor is adapted to be placed against the skin (28) of a patient, with the detector portion of the housing in contact with the skin. Also provided is an overlay (24) holding the reflector. The reflector redirects the electromagnetic radiation emitted by the emitter toward the skin. The overlay is of sufficient size to cover the area above and around the emitter and detector, while holding the reflector spaced from the opposite to the emitter. Also disclosed is a method comprising the steps of emitting electromagnetic radiation in a direction away from the skin, reflecting that radiation toward the skin, permitting some of that reflected radiation to pass through body tissue where some is absorbed, and detecting the radiation emanating from that tissue.

Reflector and cooling means therefor

Abstract: Printing apparatus utilizing lamps generating ultraviolet light to cure solvent-free ink by photopolymerization is provided with lamp reflectors having shutters to permit the lamps to remain energized while the printed work conveyor is stopped or is moving at a slow rate. A plurality of such lamps, each with an individual shutter, are arranged in parallel rows extending transverse to direction of movement of the work. As the shutters are closed, lamp voltage is reduced to a standby point where the lamps remain fired. Air is circulated at the same time behind the lamp reflector for cooling of the latter without appreciably cooling the lamp. Each reflector is a sheet of non-oxidizing metal mounted in the concave portion of a structurally strong housing. End reflectors prevent end scattering of the lampradiated energy and shield the lamp sockets from the heating effects of this energy. The lamp sockets are repositionable with respect to the reflector so that the arc thereof may be positioned generally along the focus line of the reflector for different positions of the focus line with respect to earth.

Detection apparatus for safety eyewear

Abstract: A detection apparatus for monitoring specified safety eyewear being worn by persons who are either passing into or are located in the designated area which requires that a person in the area be wearing the specified safety eyewear. The detection apparatus includes an infrared reflector which is located on the specified eyewear, an infrared transmitter for transmitting a beam of infrared radiation towards the person, an infrared receiver which receives reflected radiation from the infrared reflector on the safety eyewear being worn by the person and an alarm which is normally inactive and which remains inactive as long as infrared radiation from the transmitter is reflected back to the infrared receiver from the reflector. The alarm is activated when infrared radiation is transmitted to the person and not reflected to the receiver due to the absence of specified safety eyewear which contains the appropriate infrared reflector.

Low-loss antiresonant reflecting optical waveguide on Si substrate in visible-wavelength region

Abstract: A low-loss (0.3 dB/cm) antiresonant reflecting optical waveguide on an Si substrate was realised at 0.633 ?m wavelength by employing a TiO2/SiO2 interference reflector instead of an Si/SiO2 pair used in the long-wavelength range.