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4577963 Apparatus to evaluate objectively the concentration and motility of particles suspended in a sample of liquid with data processor and display of the results  
An apparatus to evaluate objectively the concentration and motility of particles suspended in a sample of liquid, and particularly to an apparatus to solve objectively the problem of evaluating...
4575238 Laser-doppler-anemometer  
In a laser-doppler-anemometer two frequency-displaced partial beams are transmitted from a transmitted device including a laser to a measuring probe positioned at a remote measuring volume by...
4572664 Method of measuring velocity gradients in a flowing medium and apparatus for carrying out the method  
In a method of measuring velocity gradients in a sample volume (2) in a flowing medium, by which method radiation scattered by particles entrained by the medium and irradiated by spatially...
4569588 Light frequency change detecting method and apparatus  
A method and apparatus for detecting a frequency change of a light modulates the scattered light from the object of measurement using an acousto-optic modulator or the like, heterodyne-detects the...
4552456 Optical pulse radar for an automotive vehicle  
An optical pulse radar for an automotive vehicle of heterodyne detection-type which can detect an object ahead of the vehicle with an improved S/N radio even under the worst detection conditions...
4551017 Laser doppler velocimeter for measuring torsional vibration  
The velocity and change in velocity of a rotating or otherwise moving surface is measured by a laser Doppler technique. In particular, a diffraction grating is formed on the moving surface either...
4551018 Acoustic emission analyzer  
A periodic structure such as a diffraction grating is disposed on the surface of an object from which acoustic emissions are to be detected. A plane monochromatic light beam is incident on the...
4540283 Apparatus and method for determining the size and velocity of particles, droplets, bubbles or the like using laser light scattering  
An apparatus and method for determining the size and velocity of particles, droplets, bubbles, or the like employing laser light scattering is disclosed. A laser generation means is provided for...
4537507 Dual beam maximum intensity laser sizing system  
An apparatus and method for determining the size and velocity of particles, droplets and the like is disclosed. Laser beams of the same wavelength having different diameters are caused to cross...
4537503 Multiple measuring control volume laser doppler anemometer  
The multiple measuring control volume laser Doppler anemometer includes a laser for providing an optical beam. The beam is transformed by an optical arrangement to produce a number V of measuring...
4525068 Torque measurement method and apparatus  
When a torque is transmitted through a body, the body tends to twist in proportion to the torque and to the characteristics of the material. Doppler measurements made at points separated from each...
4516432 Apparatus for measuring two-phase flow  
An apparatus for measuring liquid-gas two-phase flow comprises a light source, an optical fiber with the end face disposed perpendicularly to the flow direction of the two-phase flow, and a photo...
4506979 Compact radiation fringe velocimeter for measuring in three dimensions  
A uniquely configured radiation fringe velocimeter is used to measure all three components of velocity remotely from a single point. The device is particularly intended for utilization aboard an...
4483614 Optical air data measurement system  
A radiation fringe velocimeter subsystem and a subsystem for determining air density related parameters, are combined into a single optical system (20) which permits various important parameters...
4476875 Method and apparatus for measuring flow motions in a fluid  
For determining flow motions in a fluid containing light scattering particles, in particular for determining the blood circulation in the superficial blood vessels in a tissue, a section of the...
4470696 Laser doppler velocimeter  
Reflections, having positive and negative Doppler frequency shifts, from a laser beam directed at a moving surface are passed through spatial filters, combined by a beam splitter, and focussed on...
4466738 Vibration sensor  
The disclosed heterodyne measurement apparatus utilizes a single coherent light source to simultaneously measure the location of a number of points on a surface. The coherent light is split into...
4453825 Distance transducer  
An electronic distance meter is interfacable to a controller and measures distance to a moving target by comparing the phase of a signal propagated to the target with the phase of the reflected...
4452531 Method and means of determining acceleration  
A method and apparatus having a frequency transmitter, a frequency receiver, an oscillator tuned to the same frequency as the frequency transmitter, and a frequency differential measuring unit to...
4447149 Pulsed laser radar apparatus  
A pulsed laser radar apparatus utilizing a Q-switched laser unit to generate laser pulse signals including a low intensity trailing tail. The trailing tail is utilized to provide a local...
4429994 System for remotely determining velocity of sound in water  
A system for remotely sensing the velocity of sound in water using Brillouin scattering. A pulsed laser irradiates the water and the scattered light is collected, collimated and passed through a...
4413905 Laser range meter  
A laser range meter utilizing a mode locked laser for transmitting ultrashort pulses toward a target and a receiver for cross correlating the pulses returned from a target with corresponding...
4405230 Heterodyne laser ranging system  
A heterodyne laser ranging system is disclosed which provides a waveguide housing which includes a first and second gas laser. The first laser is a low pressure laser while the second laser is a...
4402601 Fundus camera-based retinal laser doppler velocimeter  
A bidirectional laser Doppler velocimeter provides absolute measurement of the speed of red blood cells flowing in individual retinal vessels. A standard retinal camera is used, and the need for a...
4397550 Laser doppler velocimeter  
A laser Doppler velocimeter using two laser beams, when used for the measurement of the flow velocity of slow moving particles, fails to provide the measurement because the Doppler frequency and...
4391515 Optical transmitter/receiver apparatus sharing common optics  
Optical detection apparatus is provided which includes a coherent light sce for generating a beam of coherent light. The apparatus further includes a unitized or discrete optical component which...
4387993 Particle size measuring method and apparatus  
A particle size measuring apparatus and method has a laser unit and optics that provide a central focused light area surrounded by an annular focused light area. Particles moving with fluid...
4373807 Method and apparatus for the simultaneous measurement of data, including velocity, relating to submicronic particles in a state of flow in a fluid  
The same assembly is used to first record the homodyne spectrum from the light diffused from a single beam FL2, with a mask D1 masking the beam FL1. On the passage of a critical frequency fc, mask...
4346990 Scanning afocal laser velocimeter projection lens system  
A method and apparatus for projecting and focusing parallel laser light beams from a laser doppler velocimeter on a target area. The system includes three lenses. Two lenses work together as a...
4346991 Method and apparatus for measuring retinal blood flow  
Blood flow in a retinal blood vessel is measured by detecting the doppler shift imparted to two laser beams intersecting on a portion of the retinal vessel. Twin beams of laser radiation are...
4340299 Optical doppler radar system using a conically scanned laser beam  
A homodyne laser of a first frequency is conically scanned on a surface from an elevated position and the beam is scattered by the surface. A return beam is formed from this scattered beam and is...
4334779 Non-contact optical apparatus for measuring the length or speed of a relatively moving surface  
The apparatus generates two optical beams which are directed to a relatively moving solid surface where an interference pattern, having substantially parallel fringes, is formed. The light is...
4311385 Coherent detection lag angle compensated scanning system independent of inhomogeneities of the detector  
A coherent detection scanning laser system having an optical system that compensates for the angular deviation of the received signal resulting from the scanning process, and having a detection...
4311383 Method for determination of velocity and direction of motion of moving object by speckle patterns and apparatus therefor  
Disclosed herein is a method and apparatus for determining the velocity and direction of motion of moving object by directing two coherent light beams onto the object and thereby causing moving...
4299484 Range and speed measuring equipment with noise frequency modulated transmitter  
Range and speed measuring equipment is disclosed including a laser transmitter for transmitting laser pulses of a noise modulated carrier frequency toward a target. Return pulses are received by a...
4298280 Infrared radar system  
An infrared radar system. The system includes an infrared laser and associated controller which are adapted to provide a succession of transmit pulses having a relatively high intensity spike...
4284350 Laser geophone  
A method for measuring the velocity of earth surface motion utilizing coherent light energy which comprises steps of generating and directing a coherent light beam toward a selected earth surface...
4284351 Processing of digital signals  
A method of, and apparatus for, processing a digital electric signal composed of a train of discrete uniformly or non-uniformly shaped pulses to recover spectral information contained in the...
4283113 Optical modulation with vanadium oxide thin films  
The specification discloses apparatus for switching light between optical fibers.A vanadium oxide thin film (28), switchable between high reflectance and high transmission states, is provided for...
4263002 Differential doppler technique for on-axis backscatter measurements  
A diagnostic apparatus and method for measuring motion of flowing solid and fluid particles that utilizes a differential doppler system and makes measurements parallel to the optical axis of the...
4255048 Direction sensitive laser velocimeter  
A laser velocimeter that determines the direction of movement of particles. A laser produces a transmitted beam that illuminates the volume under investigation. The backscattered light is divided...
4210399 System for relative motion detection between wave transmitter-receiver and irregular reflecting surface  
Apparatus for detecting relative motion between a rough reflecting surface and a wave transmitting and receiving system in a plane parallel or perpendicular to the reflecting surface comprised of...
4201468 Method and apparatus for Doppler frequency modulation of radiation  
A method and apparatus for frequency modulating radiation, such as from a laser, for optoacoustic detectors, interferometers, heterodyne spectrometers, and similar devices using two oppositely...
4198162 Tunable wide angular aperture filter by degenerate four-wave mixing  
A wide angular aperture, tunable filter device is achieved by using degenerate four-wave mixing. The apparatus utilizes two counter-propagating pump beams at substantially the same frequency to...
4181432 Velocity measuring system  
In order to provide a system for measuring relative velocity of a surface with the accuracy of a laser velocimeter but avoiding the problems associated with operating down to zero speed and with...
4179218 Particle size analyzer  
A particle size analyzer that measures the intensity of light scattered by moving particles passing through the probe of a crossed beam laser anemometer, verifies that the measured signal was...
4168906 Differential Doppler velocity sensor  
A sensor for measuring the velocity components of particles in an atmospheric volume which comprises means for generating first and second coherent radiation beams, means for directing said first...
4167329 Focussed doppler radar  
An optically focussed laser radar operating with a radiation wavelength of typically ten microns is focussed on an object to be observed. Doppler data is obtained with a continuous wave signal by...
4166695 Method and apparatus for measuring retinal blood flow  
Blood flow in retinal blood vessels is measured by directing laser radiation along an optical path into the eye and onto a blood vessel. Laser radiation reflected off moving blood corpuscles is...
4154529 System for detecting reflected laser beams  
A system for detecting a reflected light beam includes a source of coherent light such as a laser beam, an optical fiber spaced away from the source for receiving an incident beam of coherent...