The Boeing Company

Daniel J Sox

Blair F Campbell

Dennis M Guthals

Margarita A Carbon

Jeffrey H Hunt

Brian Gunther

Jeffery Murphy

James Tad Wegner

A system for performing grazing angle measurements is disclosed herein. The system includes a laser configured to emit a beam of light and a series of reflective elements configured to direct the beam of light and a hollow sphere is rotatable about a sphere axis with the sphere axis extending through a central region of the hollow sphere. The hollow sphere defines an elongated slot for accepting the beam of light when the hollow sphere is in one of a plurality of predetermined rotational positions about the sphere axis. A mounting arm extends into a central region of the hollow sphere and includes a sample mount configured to receive a sample. The system further includes a spectral hemispherical reflectance detector having a field of view extending into the hollow sphere and a baffle horizontally interposed relative to the sphere axis between the spectral hemispherical reflectance detector and the elongated slot.

Apparatus and method for grazing angle measurement

A 3D LIDAR obstacle avoidance system comprising a camera; a data processor; and a gimbaled laser ranging system. The gimbaled laser ranging system is bore sighted to the camera's optical axis and has its rotation axes centered on the camera focal plane (see the attached drawing). Two-dimensional information of the camera is converted to 3-dimensional information by selectively ranging scene objects of interest (i.e. moving targets). Selected object ranges are queried simply by commanding the gimbal to point to the angle in the scene represented by the object's location in the focal plane. By not sampling the entire scene, significant improvements in throughput and range are achieved. Sensor operation in inclement weather is possible by using an IR camera and a longer wavelength ranging-laser.

High performance three dimensional light detection and ranging (LIDAR) system for drone obstacle avoidance

A system for path compensation of multiple incoherent optical beams incorporates an optical element combining a plurality of incoherent beams to an aperture by angle using carrier frequency tilt fringes. An illumination laser is employed for reflection of an illumination beam from a target. An interferometer receives a sample of the reflected illumination beam reflected from the target and provides interference fringes. A spatial light modulator receives the interference fringes and generates a real time hologram. Relay optics are employed for transmitting the combined plurality of incoherent beams to the SLM and receiving a diffraction corrected full aperture compensated combined beam for emission to the far field.

Incoherent beam combining of parallel beams with optical path compensation using real time holography

A system for path compensation of multiple incoherent spectral optical beams incorporates an optical element combining a plurality of incoherent spectral beams to an aperture by angle using carrier frequency tilt fringes. An illumination laser is employed for reflection of an illumination beam from a target. An interferometer receives a sample of the reflected illumination beam reflected from the target and provides interference fringes. A spatial light modulator receives the interference fringes and generates a real time hologram. Relay optics are employed for transmitting the combined plurality of incoherent beams to the SLM and receiving a diffraction corrected full aperture compensated combined beam for emission to the far field.

Incoherent spectral beam combining with optical path compensation using real time holography

Blazing of real time holographic fringes employs an interferometer with a focal plane array (FPA) to receive interference fringes. An FPA frame is read into a fringe processor. For each row, minima are identified and a pixel value is saved and its position in the row recorded. The minima determination is repeated for each column in the row until all pixels in the row have been recorded. A blazed fringe for the single row is then created. The blazed fringe row is then transferred to a spatial light modulator (SLM). The minima determination and fringe blazing processes are repeated until all rows in the FPA array are read and transferred to the SLM. The next FPA frame is then read into the fringe processor.

Method for real time holographic fringe blazing by determining adjacent fringe minima and blazing intermediate the minima

A holographically, self-referenced interferometer may include a detector to detect interference fringes in a reference leg optical signal. The interferometer may also include a holographic correction device to holographically compensate the reference leg optical signal in response to the detected interference fringes.

Holographically compensated, self-referenced interferometer

A diode laser for providing a high-energy coherent light beam suitably includes an array of laser diodes, each producing a laser beamlet. The beamlets are provided to a spatial light modulator (SLM) with an array of pixels, each pixel corresponding to a portion of the light beam. The phase variation across the light beam wavefront is monitored at a detector, and a feedback signal indicative of the phase variation is provided to control electronics. The control electronics process the feedback signal to modulate a local index of refraction within one or more pixels of the SLM to reduce the variation in phase across the beam wavefront. Because phase variations across the beam wavefront are reduced, relatively large diode arrays can be formulated, thereby resulting in relatively high powered diode lasers.

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Redondo Beach, CA, United States of America

Daniel J Sox