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5549114 |
Short coherence length, doppler velocimetry system
Apparatus for measuring the speed of blood in blood vessels in biological samples, for example, in retinal blood vessels, which apparatus includes: (a) a source of a beam of radiation having a...
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5541732 |
Method and apparatus for measuring a relative movement between two elements
For measuring an amount of relative movement between two elements, such as a vehicle and a track, which are mutually movable, two successive pulses of coherent light are directed from the vehicle...
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5532814 |
Holographic diffraction image velocimetry for three-dimensional three-component particle fields or solid objects
A Holographic Diffraction Image Velocimetry (HDIV) providing the three-dimensional (3-D), three-component (3-C) detection of velocity or displacement field. The HDIV technique and system are based...
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5526109 |
Multi-velocity component LDV
A laser doppler velocimeter uses frequency shifting of a laser beam to provide signal information for each velocity component. A composite electrical signal generated by a light detector is...
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5517306 |
Method and apparatus for measuring angular velocity of a transparent object
A method and apparatus for measuring the angular velocity of a rotating substantially transparent object about an object rotation axis. The apparatus excites an electromagnetic field in a resonator...
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5510890 |
Laser radar with reference beam storage
In a laser radar system, in which pulses from a laser are focused by a telescope onto a target, the back-scattered radiation being deflected by polarizing beam splitter onto a detector in...
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5504571 |
Run-out velocity acceleration tester with direct velocity measurement
A Runout, Velocity, Acceleration includes direct measurement of velocity by use of a Doppler laser, and determines runout by integration of the velocity information while determining acceleration...
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5502466 |
Doppler velocimeter and position information detection apparatus for use with objects having variations in surface depth
A position information detection apparatus includes a first detection system for radiating two collimated light beams onto an object to be measured at a predetermined crossing angle to form...
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5502558 |
Laser doppler velocimeter
A laser Doppler velocimeter. A laser produces a single frequency beam which is split into a probe beam and a reference beam. The probe beam is directed at a moving target and a portion of the light...
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5500729 |
Magneto-optical arrangement for laser radar
The heterodyne detection efficiency of coherent laser radars is maximized coaxially aligning the local oscillator (LO) beam and the received laser beam when combined at the detector by preventing...
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5483332 |
Displacement information detecting apparatus and doppler velocimeter apparatus
A doppler velocimeter determines the velocity of an object moving through a beam intersection area by using a doppler frequency obtained by detecting light from the beam intersecting area. The...
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5481358 |
Coil mounting arrangement for fiber optic gyroscope using a gel loaded with particles
The sensing coil of a fiber optic gyroscope is wholly or partially surrounded by a gel. The components attached to the coil, such as the directional coupler(s) and polarizer, may also be wholly or...
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5481359 |
Multi-etalon VISAR interferometer having an interferometer frame of high stiffness with a linear elongated slide bar
A multi-etalon VISAR interferometer with variable velocity-per-fringe constant, capable of measuring the velocity of a diffusely-reflecting surface, having design innovations which preserve the...
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5453834 |
Digital burst frequency translator
A device for detecting and measuring analog coherent frequency bursts includes circuitry for digitally translating the bursts upon their detection. Based on a frequency range estimate, a sampling...
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5428438 |
Laser ranging and detection system employing a geometric coherent/incoherent beam separator
A laser ranging and detection system includes a laser for generating a coherent outgoing beam and a telescope. The telescope includes a primary mirror with an aperture for receiving the coherent...
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5424824 |
Method and apparatus for normal shock sensing within the focal region of a laser beam
A system using Lidar/Laser anemometry for measuring the position of the normal shock wave and air velocity in the inlet of a supersonic engine is described, A laser beam is focused over a region in...
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5394233 |
Apparatus for measuring high frequency vibration, motion, or displacement
Apparati and methods are disclosed for detecting vibrations, displacements and motions of a remote surface with high sensitivity, high frequency response and high accuracy using a laser beam with...
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5394243 |
Axial speed-measuring device including a fabry-perot interferometer
A device for measuring axial speed by means of a light source emitting a parallel ray beam through an optical system comprising a Fabry-Perot interferometer, spectrum offset optical means, and an...
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5383024 |
Optical wet steam monitor
A wet steam monitor determines steam particle size by using laser doppler velocimeter (LDV) device to produce backscatter light. The backscatter light signal is processed with a spectrum analyzer...
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5367371 |
Observation space vehicle having a laser-based measurement system
An observation spacecraft designed for the quantitative evaluation of the activity within a fluid mass borne by a planet embodying a platform adapted to follow an orbit around the planet and...
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5365326 |
Method and apparatus for determining flow rates and concentrations in multi-phase streams
This invention relates to a method for simultaneously determining particle concentration and velocity in multi-phase streams. These determinations may be made by use of a fiber optic probe that...
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5361131 |
Optical displacement measuring apparatus utilizing Fourier transform method
An optical displacement measuring apparatus of the present invention optically measures a displacement amount of an object. The apparatus includes: image forming means for forming an image...
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5353109 |
Receiver-transmitter for a target identification system
A receiver-transmitter for a target identification system having a particular but not necessarily an exclusive application for the identification of aircraft which utilizes laser vibrometry and a...
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5351116 |
Velocimeters
A differential laser Doppler velocimeter is based on the use of a modified fibre optic Sagnac Interferometer 1,2. The interferometer phase is dependent not on the target displacement, but on its...
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5351122 |
Absolute gravity inline measuring apparatus incorporating improved operating features
An absolute gravity inline measuring apparatus includes an interferometer arrangement, a test mass tracking system, and a superspring mechanism. The interferometer arrangement includes first and...
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5347357 |
High-voltage crystal ramp generator and integrator for FM laser radar
A power beam tube is biased to supply a constant current to an EO crystal used as part of a frequency modulation circuit for FM laser radar. Integration of the constant current by the EO crystal's...
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5343285 |
Electrical circuit for measuring the frequency of laser Doppler signals
An electrical circuit has, for measuring the frequency of laser Doppler signals, at least one counter for counting the signal pulses and a microprocessor for evaluating the counter reading which is...
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5337189 |
Scannig emitter-receiver optical device
A scanning optical device for emitting and receiving which embodies an optical source adapted to emit a primary beam along an emission axis, a deflecting mirror arranged on an emission axis so as...
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5335058 |
Time series signal multichannel frequency analyzer using liquid crystal panel
A time series signal multichannel frequency analyzer comprises a Fourier transform lens, a liquid crystal panel disposed at the front focal plane of the Fourier transform lens, means for inputting...
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5327222 |
Displacement information detecting apparatus
A displacement information measuring apparatus comprising light emitting source for emitting two light fluxes, acoustic optical device for giving a predetermined frequency difference to the two...
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5325175 |
Solid-block homodyne interferometer
A solid-block homodyne Doppler interferometer utilizing continuous-wave or pulse-wave light beam technology. A pulse-wave light beam version of the homodyne interferometer compares the pulse-wave...
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5323223 |
Radar laser transmitter
A laser radar for scanning a target aperture having a predetermined array of locations comprising a laser means having a power source and a resonator cavity containing a lasing medium, the laser...
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5319434 |
Laser rangefinder apparatus with fiber optic interface
A laser rangefinder apparatus is provided which includes a laser transmitter for transmitting a coherent light pulse over an optical path to a target. The light pulse is reflected from the target...
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5317376 |
Solid state pulsed coherent laser radar for short range velocimetry applications
The invention presents a method and apparatus for utilizing a single frequency, self seeding laser pulse signal transmitted to create a target beam to be projected toward an atmospheric target...
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5313263 |
System for, and method of, determining the speed of an airborne vehicle
This system measures the speed of an airborne vehicle relative to the surrounding atmosphere. The measurement is based on the scattering of pulses of coherent laser radiation, generated in the...
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5296910 |
Method and apparatus for particle analysis
An aerosol spectrometer combines the features of forced motion instruments and optical particle sizers. The motion of suspended particles in multiple force fields is used to obtain density,...
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5289252 |
Linear frequency modulation control for FM laser radar
A closed loop frequency control system for maintaining accurate linearity in the transmitted signal (60) in a linear frequency modulated (LFM) chirped laser radar system. A correction signal (50),...
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5274361 |
Laser optical mouse
An apparatus for determining distance coordinates along two orthogonal axes for a computer system, where the coordinates represent the position of a cursor on a screen of a display unit of the...
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5272512 |
Displacement information detection apparatus
An apparatus for detecting velocity of an object, includes a light source for generating light having a wavelength λ, a light-transmission block for receiving the light from the light source, and...
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5268739 |
Laser apparatus for measuring the velocity of a fluid
In a laser apparatus for measuring the velocity of a fluid, a measurement laser light beam (M) fed into the fluid and scattered by a particle within the fluid is made to interfere with a reference...
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5264907 |
Output optics for laser velocimeters
Space savings are effected in the optical output system of a laser velocimeter. The output system comprises pairs of optical fibers having output ends from which a beam of laser light emerges, a...
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5264908 |
Optical device for measuring the speed or length of a moved surface
The invention relates to a device for measuring the speed or length of a moved surface, where a measuring light beam from a laser is used. The laser light beam reflected from the surface to be...
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5260762 |
Device for non-contact measurement of speed, displacement travel and/or distance
The device described for the measurement, without physical contact, of the speed, displacement distance and/or range of a reflecting object has a laser diode as light source, transmission and...
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5241315 |
Micro pulse laser radar
An eye safe, compact, solid state lidar for profiling atmospheric cloud and aerosol scattering is disclosed. The transmitter of the micro pulse lidar is a diode pumped μJ pulse energy, high...
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5239352 |
Multiple scattering technique (MUST) lidar
A lidar with a laser transmitter for transmitting a laser beam and a receiver having receiving optics for detecting radiation reflected back from the beam by aerosol particles in the atmosphere,...
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5233403 |
Heterodyne array for measurement of target velocity
A system for determining the angular velocity of a mobile target relative to a station. The system develops first and second reference beams and a beam to the target to enable the target to...
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5229849 |
Laser doppler spectrometer for the statistical study of the behavior of microscopic organisms
An improved method and system of monitoring and identifying microbiota swimming in a fluid or moving across surfaces in a fluid provides a sensitive method for rapidly measuring very small changes...
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5229830 |
Doppler velocimeter
An apparatus for detecting the speed information of an object comprises a light source device, a frequency shifting device for shifting the frequency of a light flux from the light source device, a...
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5221927 |
Lidar-acoustic sounding of the atmosphere
A method of remote sensing of atmospheric conditions based on the detection of acoustic modulation of lidar returns in the atmosphere. The measured modulation is caused by density changes of the...
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5216477 |
Edge technique for measurement of laser frequency shifts including the doppler shift
A method for determining the frequency shift in a laser system by transmitting an outgoing laser beam, receiving an incoming laser beam having a frequency shift, acquiring a first signal by...
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