摘要:
Field-deployable spatial positioning or measurement systems are provided for improved versatility, reliability and performance. The spatial positioning or measurement systems use rotating laser fans or beams for positioning and measuring and include a system integrated field-deployable length standard that uses a reelable tape with positional indents. The systems further include the use of labyrinth seals at interface volumes between rotating laser heads and transmitter assemblies to prevent ingress of contaminants and allow for elimination of the use of rotary seals. Further, new dynamic leveling techniques are provided to plumb positional laser transmitter systems. Still further, strobe beam configurations are provided for improved near/far performance and a vertical mode sensing scheme that allows switching to measuring tall structures when needed.
摘要:
A method and system for determining the position of at least one position retroreflective element in a predetermined frame of reference using two benchmark positions of known coordinates. A light transmitting and detecting means and a reference retroreflective element are oppositely positioned at a primary benchmark position located at known first coordinates and a secondary benchmark position located at known second coordinates. The light transmitting and detecting means takes angular measurements by sensing a reflected light beam from the position and reference retroreflective elements. After taking angular measurements in the above configuration, the light transmitting and detecting means and the reference retroreflective element are transposed and additional angular measurements are taken. From the angular measurements, the position of the position retroreflective element is determined in the coordinate frame of reference. In addition, the light transmitting and detecting means may be further positioned at an intermediate benchmark position having unknown coordinates. After determining the coordinates of the intermediate benchmark position, angular measurements taken at the intermediate benchmark position are compared with the angular measurements from the primary and secondary benchmark positions and the most accurate measurements are used to determine the position of at least one position retroreflective element.
摘要:
The present invention is concerned with displaying moving objects (targets) wherein two time-shifted object signatures are imaged on a detector. Target scanning is with a prismatic rotating wheel, the periphery of which has a plurality of adjacent, recessed, and oppositely reflecting triplet mirror surfaces which alternately reflect the two signatures onto the detector. The position coordinates of the objects are defined by taking the difference of the detector output signals of the two object signatures. The display is characterized in that the first signature scan is delayed by an intermediate storage so that it shall be simultaneously available with the second signature scan. After taking the difference of the signals of these signature scans, the uncanceled individual signals remaining in the storage are defined as the coordinates of the moving objects and appear as electronic outputs.
摘要:
A search apparatus and method for use in conjunction with an electro-optical sensor that does not require its own integral scanning mechanism for searching object space for potential targets. The apparatus of the invention comprises a plano mirror movable azimuthally a line perpendicular to and geometrically centered on the focal plane of the electro-optical imaging sensor and further movable about an elevational axis perpendicularly offset from the azimuthal axis of rotation and outside of the field of view of the electro-optical imaging system.The method of the invention comprises rotating the plano mirror about its azimuthal axis of rotation while inclining (or declining) the mirror about its elevational axis of rotation to produce a spiral, substantially full hemispherical search without any corresponding movement of the electro-optical imaging sensor.
摘要:
A star sensor mounted in a satellite subjected to a spinning motion includes an optical system for obtaining an image of a fixed star, a CCD area sensor as an image pickup device arranged at a focal point of the optical system, a signal processing circuit for receiving an output from the CCD area sensor through a preamplifier, and a CCD driving circuit connected to the CCD area sensor. The CCD area sensor is an interline type CCD. The optical axis of the optical system is perpendicular to a spinning axis of the satellite. The horizontal scanning direction of the CCD area sensor coincides with the direction of the spinning axis. For this reason, the star image is moved on the light-receiving surface of the CCD area sensor along the vertical scanning direction with the spinning motion of the satellite. The CCD driving circuit causes the CCD area sensor to perform time-delay integration at a speed corresponding to the spinning speed of the satellite. After one-frame information obtained by the photoelectric transducer is transferred (frame shift) to the vertical transfer CCD arrays, only a one-horizontal line component is read out for a period between one frame shift and the next frame shift. Therefore, movement of the star image on the photoelectric transducer is synchronized with the transfer speed of the signal charge in the vertical transfer CCD arrays, and thus the signal charge of the star image can be integrated in the vertical transfer CCD arrays.
摘要:
An optical system for infrared detection in the 3 to 14 micrometer region comprising: a viewing aspheric corrector, a spherical mirror having a focal length, said spherical mirror being positioned to receive the light passed by said viewing aspheric corrector, a plurality of detector cells comprising an array thereof sufficient to vertically scan an image to provide high resolution and positioned to lie at the focal length of said optical system behind a narrow pass spectral filter, said detector cells being adapted to produce an electrical signal responsive to the infrared radiation detected thereby, means for moving the system field of view in azimuth, a multiplexer to scan the array of cells and deliver their signals sequentially to an image display, and a cryogenic cooling system for cooling the filter and the cells.
摘要:
A night guiding device for self-propelled missiles, comprising a daylight sighting telescope and an infrared goniometer, the unit being called a localizing apparatus, for detecting an infrared missile-borne source, or tracer, a night sighting thermal telescope, a visualization device associated therewith, further comprising a computer arranged for receiving through storing, amplifying and processing means, on the one hand signals transmitted by the localizing apparatus and characteristic of the missile position in relation to the optical axis of said localizing apparatus, and on the other hand signals supplied by the thermal telescope and characteristic of the missile position in relation to the optical axis of said thermal telescope, said computer supplying to said visualization device, signal representative of the difference between the signals received respectively from the localizing apparatus and the thermal telescope.
摘要:
A deviation measuring device for localizing an infrared radiation source relative to an optical axis, comprising a focalization lens, a linear scanning device, an infrared detection device in the focal plane of the lens and a processing circuit for the output signals of the detection device for delivering signals characteristic of co-ordinates X and Y of the source in a reference system centered on the optical axis, in which the detection device comprises two threadlike detectors non-parallel to the scanning direction and non-parallel therebetween and the scanning device comprises means for delivering pulses defining respectively a time origin and the end of a scanning period and a reference pulse indicative of the arrangement of the threadlike detectors, said pulses being applied to the processing circuit.
摘要:
A relatively large field of view is scanned to derive an indication of a point source, optical energy emitter being in the field of view, without recognizing relatively large, non-point emitters in the field of view. Each detector in an array of linearly, arranged point source detectors generates an output current in response to the energy irradiating it. The detectors have slightly displaced, narrow fields of view which are scanned so that the field of view of each detector traces a relatively narrow, substantially straight line path across the large field of view. The paths traced by a pair of detectors are substantially parallel and close enough to each other to enable the images of large targets to be indicated as undulations having approximately the same wave shape at substantially the same time positions at the outputs of the pair of detectors. Each of a plurality of negative feedback differential operational amplifiers, one for each pair of detectors, includes complementary input and output terminals which are connected to the detectors so that a point source target illuminating one of the detectors is indicated by the polarity of a pulse output of the amplifier. The inputs of the amplifier are connected to spatially arranged detectors in the array so that the large targets are subtracted in the amplifier and are not indicated in the amplifier output. In response to the output signal of each amplifier, an indication is derived to indicate which of the detectors is responsive to a point source.
摘要:
An improved apparatus for imparting a circular translatory movement to an element. This apparatus comprises two lateral parallel arms linked, at one of their ends, on the upper ends of a support, by means of universal joints, and at their other end on an oscillating shaft which is parallel to the support, and a cranked driving member connected to said support and directly mounted on the shaft of a synchronous motor, whereby said support is imparted with a circular translatory movement.