Abstract: The sensor comprises a radiation source (2), optical elements (5), a pattern generator (4), and a sensor field (3) which includes a plurality of distinguishable, measurable points. The pattern generator (4) changes the beam reflected from an object (8), imaging a pattern on the sensor field (3). An evaluator means (6) samples the individual distinguishable, measurable points of the sensor field and determines the measurement variable on that basis.

Abstract: A miniaturized DNR monitoring device is adapted to communicate over a telephone line, or otherwise, with a remote unit which may also communicate with other monitoring units. The monitoring device includes a computer chip program to select target DNR data from non-target DNR data, a memory for storing a limited amount of data, a DNR output line, means for downloading stored data over its output line to its remote unit on command or upon the occurrence of preselected events, and means for identifying transmissions to and from its remote unit by a handshake routine.

Abstract: A method and apparatus for generating cryptographic keys for a postal manifest and for synchronizing cryptographic keys for transmitting postal data securely on a communication link is presented. The techniques for generating a key and for synchronizing keys use the same apparatus but use slightly different data to create a cryptographic key.The postal data center maintains a unique set of data for each server station. Using this set of data along with a manifest sequence number (or communication transaction number) and the date, a cryptographic key is created. Each server station stores a fixed master key, KO, a permutation table, Pt, and ID, and GMT date. Using the manifest sequence number (or the communication transaction number) a row of the permutation table is altered and the master key KO is scrambled with the permutation table top get a new key K2. With K2, the date, server ID, and manifest sequence number (our communication transaction number) are encrypted.

Abstract: A laser transmitter utilizes optical far field combination of two independent lasers (80,90) and variation of RF exciting power (86) to one (80) to produce sufficient frequency modulation. Two bores (122,124) within the same dielectric body (120) are provided with two independent sets of electrodes (134,135, 138,139) and two independent RF power sources (150,152). The lasers are operated at different frequencies and the beams transmitted in parallel adjacent paths to provide a combined far field optical beam component at the beat frequency of the two lasers. Variation of the frequency of one of the lasers provides frequency modulation of the far field beat frequency, enabling reception and demodulation of the modulated beam without use of a local oscillator laser at the receiver. The transmitter may also be used in a laser radar.

Abstract: An electro-optical spin measurement system for a spin model in a spin tunnel includes a radio controlled receiver/transmitter, targets located on the spin model, optical receivers mounted around the perimeter of the spin tunnel and the base of the spin tunnel for receiving data from the targets, and a control system for accumulating data from the radio controlled receiver and receivers. Six targets are employed. The spin model includes a fuselage, wings, nose and tail. Two targets are located under the fuselage of the spin model at the nose tip and tail, two targets are located on the side of the fuselage at the nose tip and tail, and a target is located under each wing tip. The targets under the fuselage at the nose tip and tail measure spin rate of the spin model, targets on the side of the fuselage at the nose tip and tail measure angle of attack of the spin model, and the targets under the wing tips measure roll angle of the spin model. Optical receivers are mounted at 90.degree.

Abstract: Aligning a stable ring resonator by the use of an inversion mechanism ins the resonator and a pair of anti-symmetric masks. Each mask has opaque and clear parts and the masks are anti-symmetric in that, in use, one mask is positioned so that its opaque and clear parts are anti-symmetric to the opaque and clear parts of the other mask when it is in position. One mask is placed between the radiation source and the beam splitter while the other mask is placed between the beam splitter and the focal plane on which the two beam portions created by the beam splitter focus. One beam portion is directly reflected from the beam splitter and the other portion is transmitted into the resonator and is inverted while following a beam path within the resonator before being outcoupled through the beam splitter in a much weakened state.

Abstract: An optical radar system for coherent ranging and velocimetry. Modulation of a laser diode by light backscattered from a target is used to determine distance and velocity of a target. An array of laser diodes are used to determine the velocity and topography of a target. Three laser diodes are used to determine speed and orientation of a rotating disk.

Abstract: A method of measuring the flow velocity in wind tunnels is indicated, in which a path covered by particles located in a flow is employed as a measure of the flow velocity. In a pre-determined time interval, the particles are illuminated twice in a plane by means of a light, and a light reflected by the particles is recorded and transmitted in the form of an image. The image is transilluminated by a second coherent light beam focused in a first Fourier plane, and in this way a first Fourier-transformed image is produced, which is recorded in its turn. The image and the first Fourier-transformed image (23) are displayed immediately. The first Fourier-transformed image (23) is transilluminated by a third coherent light beam (19), and consequently a second Fourier-transformed image (34) is produced in a second Fourier plane (33) in an optical manner. The second Fourier-transformed image (34) is recorded and immediately further processed.

Abstract: A three-dimensional laser Doppler velocimeter (10) has laser optics (12) for a first channel positioned to create a probe volume (18) in space, and laser optics (14) and (16) for second and third channels, respectively, positioned to create entirely overlapping probe volumes (20) in space. The probe volumes (18) and (20) overlap partially in space. Photodetector (22) is positioned to receive light scattered by a particle present in the probe volume (18), while photodetectors (24) and (26)are positioned to receive light scattered by a particle present in the probe volume (20). The photodetector (22) for the first channel is directly connected to provide a first channel analog signal (23) to frequency measuring circuits 28. The first channel is therefore a primary channel for the system.

Abstract: This invention provides apparatus and method to increase the direct measurement accuracy of a rotary encoder type of micrometer 10. To overcome a maximum measurement accuracy of 100 microinches there is provided a laser displacement meter which includes a laser head 24 which is coupled to a micrometer bed 12 by a pair of of clamps 26a and 26b and by a magnetic plate 28. Laser head 24 has an output display 30 associated therewith for indicating the magnitude of the measurement made by the laser head 24. Laser head 24 is operable for providing an output chirped laser beam 32 and for receiving a reflected output beam 34. A corner cube reflector 36 is mounted by an arm 38 to a headstock spindle 18. The reflected return beam is detected and processed by a phase demodulator and converted into pulses. The pulses are counted and converted to distance and displayed.

Abstract: A security technique for use in an intelligent network. The security technique provides a method for authorizing access by a process located in an invocation node to an object, or a network resource, located in an execution node. The method includes the steps of granting permission to the invocation node to access the object by transmitting a capability and a signature from the execution node to the invocation node. The capability includes a unique indentifier of the object and access rights to the object. The signature is formed at the execution node by encryption of the capability with an encryption key that is unique to the invocation node and is stored only in the execution node. A request for access to the object is transmitted with the capability and the signature from the invocation node to the execution node. At the execution node, the request is authenticated by encryption of the capability with the encryption key that is associated with the invocation node to form a test signature.

Abstract: An apparatus and method are provided for static and dynamic testing of the boresight alignment of an electro-optic system, the system having a line-of-sight sensor responsive to first radiation from a target for sensing the location of the target and setting the direction of a target vector to correspond to the location of the target, and having a line-of-sight illuminator for directing an illumination beam of second radiation at the located target. The apparatus comprises a main optic for receiving the second radiation from the electro-optic system and focusing the second radiation about a focal point in a focal plane substantially perpendicular to a principal radiation path.

Abstract: Apparatus for and method of unscrambling a parallax panoramagram that is a lineticular dissection of a bar code formed by scrambling the bar code in accordance with a graticule formed of a plurality of parallel contiguous focussing elements disposed at a spatial frequency greater than the modular spatial frequency of the bar code. The method includes positioning said panoramagram contiguous to the opposite surface of a light transparent screen having a plurality of elongated parallel line elements including focussing surfaces disposed in common along a first surface of the screen, the spatial frequency of those line elements being matched to the spatial frequency of the focussing elements. Positioning is achieved so that the line elements are disposed substantially parallel to the lines in the lineticular dissection.

Abstract: A new sub-micron bipolar transistor structure is proposed which utilizes narrow horizontal conducting layers between the edges of the active areas and the associated metal contacts. This structure allows the formation of a completely vertical transistor structure and eliminates the need for the extended buried collector and collector reach-through diffusion regions.

Abstract: A power source converter apparatus that is the structural and functional ivalent of a typical internally stored battery, such as a lithium organic cell. The converter has a shape and size that conforms to that of the battery being replaced. The converter includes a pair of output terminals that can make electrical contact with appropriate elements in the unit in the same manner as did the battery it replaces and a pair of input terminals accessible to the exterior of the unit for connection to an external power source. Internally of the converter body, there is mounted an electronic circuit to be used as a power conditioner and a voltage regulator for performing the proper DC-to-DC voltage conversion to ensure the necessary voltage at the output terminals. A threaded cap is fixed to the converter for use in covering the opening in the battery housing.

Abstract: A miniature daytime dynamic alphanumeric/graphic flight symbology generator and display system in which raw aircraft data, such as altitude, airspeed, heading etc., are generated by a display generator into symbology indicating the data intensity. The symbology is transmitted by a signal transmission means, to a symbology image source by a means such as fiber optic links in case of optical signals or flexible cable in case of electrical signals. The symbology from the image source is projected onto a combiner directly in the line of sight of the aviator so that symbology indicating the various conditions of the aircraft is viewed by the aviator as an overlay with the actual scene. The combiner is enlarged to provide a 30.degree. field of view and has a spectral coating thereon to enhance the symbology for daytime viewing. The display generator has a variable control means to increase the data intensity for daytime viewing.

Abstract: A Cassegrain telescope having a primary mirror having an aperture centered n the axis thereof and a secondary mirror spaced from the primary mirror and centered on the axis of the primary mirror for receiving reflected light from the primary mirror and reflecting it through the aperture in the primary mirror and a support member extending from the primary mirror support structure to the secondary mirror. The support member is in the form of a conical honeycomb having cells extending in a direction parallel to the axis of the primary mirror. The support member is made from a carbonized polymeric material.

Abstract: This invention relates to a mainlobe jamming cancellation system which can e used to allow a radar to detect targets even when relative motion exists between the jammer and the radar platform. In particular, this invention relates to a mainlobe canceller that utilizes a main antenna and one or more widely spaced auxiliary antennas in conjunction with one or more phase locked loops (PLL), to automatically align the jamming signals received by the several antennas. The alignment is necessary to realize a high degree of jammer cancellation.

Abstract: A nuclear radiation detection system for remote monitoring of movement of nuclear material over a road or highway. Nuclear fiber sensors, which may be several meters long, are covertly positioned in at least two monitoring points, such as buried shallowly under the roadway or hung from a tunnel wall, along the path which a nuclear source may be clandestinely moved. These fiber sensors are individually connected, by an epoxy glue, to individual transmitting optical fibers. Movement of a nuclear radiation source in close proximity to the fiber sensors at the two or more monitoring points produces an optical signal which exceeds a preestablished threshold. These optical signals travel through the transmitting optical fibers, which may be about 1 kilometers long, to a electronic system comprised of a microprocessor controlled signal detecting, signal processing and even data storage means. The optical fibers and electronic system are also selectively hidden from view for security reasons.

Abstract: A circuit is provided for converting binary information received at first logic high and logic low voltage levels from circuitry of a first logic family into logic high and logic low voltage levels for use by circuitry of a second logic family, and more particularly to a TTL to CMOS converter. A reference stage is provided having a temperature stable reference potential source. The reference potential controls the output from the reference stage which is applied as one input to an input stage, the other input to this stage being the input binary voltage levels. The reference stage output controls the input stage to generate a control potential, the level of which changes when the input voltage level passes through a value which is substantially equal to the reference potential.