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5159396 Laser gun ammunition measurement equipment  
An apparatus is described for measuring the velocity of an object by measuring the Doppler frequency shift of a reflected laser beam. A laser beam is projected onto a target area which is moving...
5155542 Doublet pulse phase conjugate atmospheric energy transfer system  
A coherent energy transfer system is disclosed which utilizes a doublet pulse laser transmitter in combination with a phase conjugate mirror (PCM) assembly. In one embodiment of the present...
5151747 Laser radar wire detection  
A laser radar detection system (10) is provided for detecting targets located within a detection field and discriminating between unresolved and resolved detected objects (32,34). The detection...
5150170 Optical phase conjugate velocimeter and tracker  
Apparatus and method for determining velocity and range of a target within a field of view. A velocimeter and tracker (10, 100) includes a laser (12, 12') that produces modulated coherent light, a...
5148229 Laser velocimetry technique for measuring the three dimensional velocity components of a particle in a fluid flow  
A laser velocimetry technique for the measurement of the three dimensional components of velocity of a particle in a fluid flow has been described. It is based on the use of a measurement region...
5129400 Ophthalmological measurement method and apparatus  
In an ophthalmological measurement method and apparatus, a laser beam of predetermined diameter is projected to the eye fundus and movement of a speckle pattern formed by light scattered by blood...
5123730 Apparatus for optical remote wind sensing  
The apparatus of the present invention includes a light source for producing a coherent beam of light. A beam splitter is provided for splitting the beam of light into a first, transmitted beam...
5110204 Velocity measurement by the vibrational tagging of diatomic molecules  
First and second relatively high power laser beams are directed into a volume enclosing a flow field of molecules of a molecular species. The beams are focussed to form an overlapping region of...
5110207 Optical system including interferometer for enhancing the performance of a photoconductive non-shot noise limited detector  
An interferometer for transmitting a beam of electromagnetic energy toward a target, portions of the transmitted beam reflected by the target being directed onto a detecting surface of a detector...
5094526 Integrated optical waveguide doppler velocimeter  
A Doppler velocimeter for measuring the doppler frequency shift of light scattered from particles suspended in a medium. The velocimeter includes a light source and an integrated optical waveguide...
5090801 Laser velocimeter for near-surface measurements  
A laser Doppler velocimeter for near-wall measurements which includes at least one beam-turning device. The beam-turning device receives laser light, reflects and redirects the light at various...
5088815 Laser device for measuring wind speeds at medium altitudes by using a Doppler effect  
A device for measuring the speed of the wind at medium altitude by the Doppler effect within the visible frequency range comprises a laser which emits pulses of light, a telescope which receives a...
5074307 Ophthalmological diagnosis apparatus  
An ophthalmological diagnosis apparatus is provided in which a laser beam is projected at a region of the eye fundus to produce a laser speckle pattern formed by light scattered from tissues of...
5069545 Laser radar system  
The invention is directed to a laser radar method for measuring velocity of moving objects wherein the laser light reflected from the measured object is coupled back into the laser resonator and...
5064280 Method of measuring the velocity and/or length of endless webs of textile material and apparatus for carrying out the method  
A method and an apparatus for measuring the velocity and/or length of endless webs of textile goods are described. The textile web is irradiated with a light beam of which one deflects a first...
5059901 Visible light laser tachometer for sensing rotational speed of an object  
A laser light tachometer for measuring the rotational speed of a selected rotating body without making physical contact with that body. The laser technology art is used to provide a beam of light,...
5054913 Method and apparatus for measuring the velocity of a fluid using analysis of Young's fringes in speckle photography  
A method and apparatus for measuring the velocity of a fluid in which a double-exposure image of the speckle pattern or particle images of tracer particle in a fluid is irradiated with a...
5048951 Laser anemometer with several measurement directions  
A laser anemometer with several measurement directions is disclosed, in which an incident beam (3) is intercepted by two disks (91, 92) having a common axis which are driven in rotation about this...
5047845 Charge-transfer-device planar array for detecting coherent-light phase  
Respective processors for pairs of photodetecting elements are included in an imager used for sensing hologram fringe patterns in an optical interferometer. These processors remove the...
5047653 Device on board a moving vehicle to obtain signals representative of the relative speed of the vehicle with respect to an ambient fluid  
A device uses fringe laser diode anemometers which, from the beams coming from one or more laser diodes, form measuring volumes having interference fringes. The component of the relative speed of...
5018852 Motion detection, novelty filtering, and target tracking using an interferometric technique with GaAs phase conjugate mirror  
A method and apparatus for detecting and tracking moving objects in a noise environment cluttered with fast- and slow-moving objects and other time-varying background. A pair of phase conjugate...
5013928 Optical equipment of fiber laser Doppler velocimeter  
A beam expander is used with a perforated concave lens and a plano convex lens to expand a beam diameter to make a small measurement volume to increase an intensity of light scattered, which...
5011279 Fiber-optical sensor  
In a fiber-optical sensor used for measuring the Doppler broadening of scattered laser light by the principle of quasi-elastic light scattering (QELS), the scattered light originating from...
5007731 Doppler fluid flow velocity measuring apparatus and method utilizing imaging of scattered light  
In the method, a volume (5) to be measured is illuminated by a pair of light beams (3) which cross each other. The Doppler-shifted scattered light (8) originating from the particles (6) which are...
5005144 Signal processing system for flow velocity in laser doppler velocimeter  
A period of a correlation signal from a laser Doppler velocimeter is calculated from crossing points at which a correlation function crosses over a threshold level by clipping and digitizing a...
5000567 Laser radar system for detecting an object  
A laser radar system for detecting objects transmits a laser beam which is frequency modulated by the motion of scanning mirrors, which scan the beam across an object to be imaged. The return...
4997272 4π laser Doppler anemometer (LDA) for measuring the velocities of moving objects  
Laser Doppler anemometer with a wavelength-stabilized laser diode (1) whose beam after splitting (7) is so concentrated in a definite area (9) of a particle-containing flow of a fluid with the...
4995720 Pulsed coherent Doppler laser radar  
In a pulsed coherent Doppler radar, a Q-switched laser source develops a laser beam to have a high intensity pulse portion and a substantially lower intensity trailing tail portion. A switching...
4990791 Multi-dimensional laser Doppler velocimeter  
A reference beam type optical laser Doppler velocimeter for emitting two or more probe beams to an object to be measured at a predetermined angle to multi-dimensionally measure a velocity and/or a...
4988190 Absorption line filter window and method for velocity measurements by light scattering  
Velocity is measured by observing velocity-related frequency shifts in light scattered from moving air molecules or particles suspended in moving air, by passing the scattered light through an...
4974960 Laser doppler anemometer using high-frequency laser pulses  
A laser Doppler anemometer with at least two laser beams pass to a region of a fluid flow containing particles. The scattered light is frequency shifted by the Doppler frequency resulting from the...
4960329 Chirp pulse echo ranging apparatus  
The difficulty of making Doppler shift velocity measurements in a chirp pulse echo ranging system is overcome by employing a pulse frequency compression filter, suitably a SAW compressor 45,...
4948257 Laser optical measuring device and method for stabilizing fringe pattern spacing  
Methods and apparatus for enhancing the accuracy of laser optical measuring instruments using fringe pattern spacing are disclosed. The apparatus in one embodiment includes a laser beam source 10,...
4940330 Laser Doppler anemometer  
A laser Doppler anemometer includes at least a first and second laser source, an optical system for directing laser beams from the sources to a specific region of a fluid flow containing particles...
4932775 FM laser transmitter  
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...
4929951 Apparatus and method for transform space scanning imaging  
An image of a target (11) is produced by illumination of the target (11) with overlapping fields (18, 20) of wave energy, such as coherent light, producing an interference pattern (22) moving...
4928152 Process and device for optically measuring the distance and the velocity of a target  
A device for optically measuring the distance of a target (20) comprising a monomode coherent light source (18) means (18a, 21, 30) for periodically varying the wavelength of the light of the...
4927263 Position and velocity imaging system using 2-D laser diode array  
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...
4925297 Three-dimensional laser velocimeter simultaneity detector  
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...
4922307 Method and apparatus for improving the measuring accuracy of a micrometer  
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...
4919532 High accuracy semiconductor laser doppler velocimeter  
A Doppler velocimeter having a semiconductor laser which sends a laser beam through a polarization beam splitter onto an fractional-wavelength plate. The plate both reflects the beam back to the...
4919536 System for measuring velocity field of fluid flow utilizing a laser-doppler spectral image converter  
A flow field seeded with small particles is illuminated by collimated, monochromatic laser light sheet 16. Doppler shifted scattering from particle motion is imaged by an optical system 22. An...
4915499 Optical device using a matched interferometric analyzer and filter  
The device according to the invention comprises a wide spectrum lighting source (60), a first interferometer (FP1) serving as a filter, a second interferometer (FP2) with the same characteristics...
4902125 Optical system having beam amplification  
A laser radar system having amplification of the optical beam. In a system where it is desired to achieve greater information content or greater system sensitivity, one or more laser amplifiers in...
4902127 Eye-safe coherent laser radar  
In an eye-safe coherent laser radar, a laser diode optically pumps a solid state non-planar ring laser to produce the coherent output laser radiation. The laser radiation is passed through a...
4895442 Velocimeter with an optical fiber mosaic  
Velocimeter comprises a measuring volume (100) in a particle-laden fluid stream, means for brightly illuminating the measuring volume and means for measuring, based upon the light scattered by...
4895441 Method and apparatus for precision ranging  
An improved method and apparatus for precision ranging is described using a frequency-modulated signal source to stimulate creation of interference fringes at a rate proportional to absolute...
4893923 Doppler laser radar system  
A coherent laser radar system in which a number of individual receiver modules are deployed in an area relatively near the targets to receive signals originating at a transmitter located at a much...
4887213 System for, and methods of, providing for a determination of the movement of an airborne vehicle in the atmosphere  
Light from a moving airborne vehicle and scattered from atmospheric particles produces at first and second detectors at the vehicle, signals which are spatially and spectrally filtered, and...
4886361 Flat tactile sensor  
A description is given of a tactile sensor for measuring force with fine resolution which is based on a network of glass fiber optic interferometers. The counting of interference fringes as...