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6556854 |
Blood vessel imaging system using homodyne and heterodyne effects
A homodyne interference system splits first and second light beams from a common light source and causes the first and second light beams to impinge upon an irradiating point of an organism at...
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6542227 |
System and method of measuring flow velocity in three axes
A LIDAR system for measuring flow velocity in three axes comprises: a LIDAR arrangement of optical elements for generating a coherent beam of light and directing the coherent beam of light by at...
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6542226 |
Planar particle imaging and doppler velocimetry system and method
A planar velocity measurement system ( 100 ) is operative to measure all three velocity components of a flowing fluid ( 106 ) across an illuminated plane ( 108 ) using only a single line of sight....
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6535276 |
Method for measuring the velocity of particles in a fluid medium in motion
A method measures the three dimensional position of particles in a fluid medium contained in a sample by recording a digital hologram of the particles on an image sensor and by reconstructing the...
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6532061 |
Measuring the velocity of small moving objects such as cells
Frequency domain velocity measurements and time domain velocity measurements are made using light from cells or other objects. An optical grating is used to modulate the light from an object so...
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6525822 |
Method for optical three-dimensional velocimetry of scattered particles
A three-dimensional particle image velocimetry method is described, in which a stream system containing light-scattering particles is exposed continuously over a certain period or at least two...
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6522397 |
Method and a device for measuring speed by the doppler effect
A method and device for measuring the speed of at least one object by Doppler effect, whereby the light diffused by an object illuminated by a laser sheet is transmitted to a CCD video camera by...
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6509866 |
Fast chirp transform
A Fast Chirp Transform (FCT) for the digital processing of chirp signals and exemplary applications. The FCT is a generalization of a multidimensional Fast Fourier Transform. Phase coefficients for...
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6507391 |
Measuring the velocity of small moving objects such as cells
Frequency domain velocity measurements and time domain velocity measurements are made using light from cells or other objects. An optical grating is used to modulate the light from an object so...
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6490027 |
Reduced noise optical system and method for measuring distance
A reduced noise optical system is provided for use in measuring distance, range-finding and scanning. The system comprises at least one lens, at least one receiver operably positioned to receive a...
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6486959 |
Dynamic holographic velocimeter for the measurement of vibrations
A process for velocimetric measurement of a target including causing interference in a dynamic holographic material of a reference laser beam and a beam diffused by the target, and measuring...
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6469778 |
Coherent laser radar system and target measurement method
A coherent laser radar system includes a pulsed laser oscillating a pulsed laser beam which is split into two parts by an optical divider. A first part of the two is transmitted as a transmitted...
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6437855 |
Laser doppler velocimeter with high immunity to phase noise
Signal processing methods are disclosed for processing Laser Doppler Velocimeter (LDV) signals. A true Doppler frequency is extracted from the phase noise frequencies by maintaining a highest...
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6429926 |
Optical flow meter capable of operating with a variable refractive index
An optical design for delivering or receiving light from a fluid being measured is disclosed. The optical design is capable of immersion in the fluid being measured, and is capable of operating...
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6424408 |
Wake turbulence detecting system
Reducing blind spots of a laser radar observing wake turbulence is required for detecting efficiently the wake turbulence which appears behind the main wings of an aircraft and affects the flight...
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6388739 |
Self-referencing microdoppler ladar receiver and associated detection method
A self-referencing microdoppler ladar receiver is provided for detecting the vibration of a target based upon an analysis of backscattered signals without a local reference derived from the...
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6381007 |
Photosensitive charge-accumulating device and a lidar incorporating such a device
The photosensitive device implements charge coupling and accumulation for analyzing a light signal. A sensor has an image zone M rows and N columns of photosensitive sites for receiving a light...
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6359682 |
Fluid flow velocity measuring system for internal combustion engine
A fluid flow velocity measuring system for an internal combustion engine including a laser Doppler velocimeter having a probe for projecting a pair of coherent laser beams and beam guiding means...
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6330056 |
Laser telemeter
A laser telemeter having separate transmitting and receiving optical systems, and at least monocular target observation, in which a telescope optical system (5, 6) which is inserted before the...
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6325172 |
Geophone including laser interferometer
An interferometric geophone includes a freely-falling reference mass and an interferometric arrangement to measure motion of a surface to which the geophone is attached. The mass may fall through...
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6323943 |
Vibration measurement method and apparatus
The present invention provides a vibration measurement method and apparatus utilizing a self-mixing type laser Doppler vibrator meter. The vibration measurement method includes steps of:...
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6323949 |
Optical measurement method and apparatus which determine a condition based on quasi-elastic-interaction
A method and an apparatus are provided for the determination of a condition or state of an object based on quasi-elastic interaction between the object and light transmitted to the object. This...
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6320651 |
Method and apparatus for determining a velocity
A velocity such as wind velocity is measured based on a Doppler shift of a backscattered or returned laser signal. The Doppler shift of the backscattered beam is determined from a change in the...
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6313908 |
Apparatus and method using a holographic optical element for converting a spectral distribution to image points
A holographic optical element transforms a spectral distribution of light to image points. The element comprises areas, each of which acts as a separate lens to image the light incident in its area...
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6297878 |
Non-scanning, three-axis, self-referenced heterodyne laser air data sensing system
A three-axis, non-scanning, self-referenced laser air data sensing system comprises a support having three separate laser diodes providing beams of coherent light, which beams are directed toward...
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6285288 |
Remote air detection
A transmitter (41) is arranged to produce and focus a beam (54) on a remote focal point (55). A small proportion of resultant light (58) is back-scattered from the focal point (55) by particles or...
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6275284 |
Pipeline optical flow meter
The present invention provides an optical device for the measurement of flow rates of fluid through a pipe. The device broadly comprises a narrow frequency light source, an optical delivery system,...
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6258612 |
Determination of flux prior to package assembly
A package assembly is formed by applying flux to a device and/or a substrate and inspecting the applied flux to determine whether the amount applied is within a predetermined range. Embodiments...
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6233045 |
Self-mixing sensor apparatus and method
A self-mixing sensor usable for remotely measuring speed, vibrations, range, and length is provided in a manner making the device practical for economic implementation while retaining accuracy. In...
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6224732 |
Method and apparatus for separating particles
A dispersing medium containing plural types of particles is let to flow in a flow path formed in a flow cell. The flow cell is irradiated with interfering light to form interference fringes of a...
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6181412 |
Incoherent doppler laser detection and ranging system
The invention relates to an incoherent Doppler laser detection and ranging system of the Lidar type comprising an emission laser and a receiver device including at least one telescope, an edge...
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6177983 |
Method and system for the measurement of specific characteristics of small particles
A method for producing measurements of specific key characteristic parameters of small particles suspended within a scattering medium includes the step of directing a beam of light into the...
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6141086 |
Laser doppler velocimeter
A laser Doppler velocimeter is formed using erbium-doped fiber as the lasing medium. The fiber is diode-pumped. By properly modulating the lasing in the fiber, pulses of radiation may be generated....
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6133993 |
Length and velocity measurement apparatus
A length and velocity measurement apparatus based upon an interference pattern created between the amplitude modulation component of a transmitted signal, generated by an RF/microwave modulated...
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6128072 |
Optical flow meter integrally mounted to a rigid plate with direct optical access to the interior of a pipe
The present invention provides an optical device for the measurement of flow rates of fluid through a pipe. The device broadly comprises a narrow frequency light source, an optical delivery system,...
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6115121 |
Single and double superimposing interferometer systems
Interferometers which can imprint a coherent delay on a broadband uncollimated beam are described. The delay value can be independent of incident ray angle, allowing interferometry using...
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6100965 |
Laser speed measurement and range finding device
The purpose of this invention is a laser speed measurement and range finding device, with coherent detection comprising: a microlaser (10) with continuous emission comprising an active laser...
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6100516 |
Velocity measurement device and laser range finder using a coherent detection
The invention relates to a velocity measurement device of the coherent detection type comprising: an active laser medium (10), an input mirror (M 1 ) and a first output mirror (M 3 )...
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6078384 |
Process and arrangement for the evaluation of laser doppler signals
Processes and arrangements for the evaluation of laser Doppler signals, especially in laser Doppler anemometers (LDA) or vibrometers, are disclosed. The object of these processes and arrangements...
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6064473 |
Particle measuring apparatus and its calibration method
In a particle measuring apparatus using laser Doppler velocimeter, it is intended to facilitate calibration of the apparatus for measuring the shape of particle. Laser beams passing through a first...
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6064472 |
Method for speed measurement according to the laser-doppler-principle
A method for speed measurement according to the laser-Doppler-principle with which with the help of a beam splitter the light beam of a laser is converted into two part beams crossing on or in the...
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6040899 |
Optical velocimetric probe
An optical velocimetry probe used in avionics. A measurement volume through which particles can pass is illuminated with a light beam. Light which is backscattered by the particles causes...
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6034760 |
Method of detecting weather conditions in the atmosphere
Method and apparatus for detecting conditions in the atmosphere which are hazardous to flying aircraft and providing early warning to pilots or ground personnel. The method includes using a laser...
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6034761 |
Displacement information measuring apparatus
An apparatus for measuring displacement information of an object. The apparatus has a light source emitting a light beam, an electro-optical crystal member, a voltage applying system for imparting...
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6008887 |
Single beam laser surface velocity and displacement measurement apparatus
Single-beam laser apparatus for measuring surface velocity at acoustic frequencies and surface displacement at ultrasonic frequencies includes a source laser and optics for directing a single laser...
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6002483 |
Non-contact interference optical system for measuring the length of a moving surface with a large N.A. collector optical system
An optical device for measuring the length of a surface that has an undulating specular appearance. The device includes a beam delivery unit that superimposes a pair of laser beams onto a moving...
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5991697 |
Method and apparatus for optical Doppler tomographic imaging of fluid flow velocity in highly scattering media
Optical Doppler tomography permits imaging of fluid flow velocity in highly scattering media. The tomography system combines Doppler velocimetry with high spatial resolution of partially coherent...
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5978073 |
Optical device for detecting the characteristics of moving particles
The device uses the principle of the Doppler effect laser velocimeter. It comprises emitter and receiver optic guides formed by integrated optics techniques on a single substrate, preferably made...
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5940789 |
Stage control method and apparatus with varying stage controller parameter
An improvement in the performance characteristics of a controller for a high precision positioning system, by continuously updating a variable parameter in the controller transfer function in...
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5926276 |
Apparatus having an afocal lens system used in optical measurement of displacement
An optical displacement measuring apparatus including an afocal optical system within a plane containing paths of at least two light beams. The afocal optical system includes a first lens optical...
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