472 results about "Light scan" patented technology

The invention relates to a visual inspection technology. In order to meet the requirements of fast and high-accurate surface three-dimensional (3D) topography online measurement and the detection requirements of a production line on intelligence, fastness, high accuracy and low cost, the invention adopts the technical scheme that: a high-speed scanning and overall imaging 3D measurement method comprises the following steps of: carrying out external modulation on a driving power supply by using a laser so as to control the output of a word line laser; rotating a multifaceted prism under the drive of a high-speed motor, wherein line-structured light outputted by the laser is reflected and projected to the surface of a measured object by the multifaceted prism; and placing a photoelectric detector at a position which is the limit position projected by the line-structured light during the rotating process of the multifaceted prism, carrying out exposure on an area-array CCD (Charge-Coupled Device) camera during the process that the line-structured light scans the whole area, and establishing a measurement model, wherein the 3D coordinate (xp, yp, zp) of the surface feature point of the measured object is obtained according to a formula by using an image coordinate (u[theta]p, v[theta]p) formed by the area-array CCD camera and [theta]p. The high-speed scanning and overall imaging 3D measurement method is mainly applied to the fast and high-accurate surface 3D topography online measurement.

The present invention provides a ground three-dimensional laser scanning point cloud and image fusion and registration method, and the limitation of the scanning of the ground three-dimensional laser scanning technology is overcome. The point cloud data obtained by ground three-dimensional laser scanning often comprises various areas which can not be measured, point cloud holes are generated, and thus local area information of a scanned object is lost. The holes cause that a model can not realize visualization correctly, and model subsequent processing is influenced too. For the above problems, the invention aims to solve the problems through the following technical scheme that an SIFT image is used to carry out mosaic processing of collected image photos by means of an algorithm to obtain a panoramic image, the intensive reconstruction is carried out through the panoramic image to obtain the 3D point cloud data generated by the image photo, and an iterative closest point algorithm (ICP) is used to realize the registration working of laser scanning point cloud and image data generation point cloud.

A first optical module scans a portion of an eye with a line of light, descans reflected light from the scanned portion of the eye and confocally provides output light in a line focus configuration. A detection device detects the output light and images the portion of the eye. A second optical module detects an optical distortion and corrects the optical distortion in the line of light scanned on the portion of the eye.

A pixel clock generating device includes a measurement unit that measures a scanning time required for scanning a length and outputs a measured value, a pixel clock generating unit that generates a pixel clock, and a reference clock generating unit that generates a reference clock having a frequency higher than the pixel clock. A phase of the pixel clock is controlled based on (i) the reference clock and (ii) a comparison result between the measured scanning time and a preset scanning time.

A large screen emissive display operating at atmospheric pressure includes pixels, the red, green, and blue subpixels of which are excited by UV laser light scanned onto the subpixels by a pixel activation mechanism. The pixel activation mechanism includes three grating light valves (GLVs) that are controlled by a processor in response to a demanded image to modulate the UV light as appropriate to produce the demanded image.

A scanning optical spectrometer with a detector array is disclosed, in which position of focused spot of light at the input of a dispersive element such as arrayed waveguide grating (AWG) with a slab input, is scanned using a micro-electro-mechanical (MEMS) tiltable micromirror so as to make the dispersed spectrum of light scan over the detector array coupled to the AWG. Sub-spectra recorded using individual detectors are concatenated by a processor unit to obtain the spectrum of input light.

A two-dimensional micro optical scanner is provided. The two-dimensional micro optical scanner includes a first scanner with a first mirror pivoted in a first direction; a second scanner with a second mirror pivoted in a second direction; and an optical path changing member with a curved mirror. The optical path changing member directs light scanned by the first scanner to the second scanner.

The invention discloses a coherent Brillouin optical time-domain analysis sensing system based on phase modulation probe light. In the system, an electro-optic intensity modulator is driven by an electric pulse signal to externally modulate light carrier waves to generate pump light, the electro-optic intensity modulator working at a carrier wave inhibition point is driven by a microwave signal to externally modulate light carrier waves to generate local light, the local light is externally modulated through an electro-optic phase modulator to generate symmetric side bands as the probe light, and the electro-optic phase modulator is driven by a frequency-adjustable radio-frequency signal. Two components of the probe light scan a Brillouin gain area and a loss area of the pump light respectively at the same time, and losses of the pump light can be dynamically compensated so that non-local effects can be reduced while amplitude modulation is carried out on the pump light by a Brillouin gain spectrum. Frequency beating is carried out on the probe light and the local light through a photoelectric detector, information of the Brillouin gain spectrum is loaded to GHz high-frequency carrier waves to avoid base band noise damage, and meanwhile the signal-to-noise ration of the whole system is improved through coherent detection.

An image display device which reduces speckles in an image display device using a laser source includes: a laser source which emits excitation light; a collecting lens which collects the excitation light; a deflecting element which scans the excitation light collected by the collecting lens; and a light conversion panel which converts a wavelength of the excitation light scanned by the deflecting element and emits fluorescence, wherein the light conversion panel includes a plurality of phosphor layers which are planarly disposed, absorb the excitation light, and emit the fluorescence.

The invention relates to an optical fiber white light interferometry method, in particular to a phase-shift white light interferometry method based on a 3*3 optical fiber coupler, belonging to the technical field of optical fiber sensing. A 2*2 optical fiber coupler and a 3*3 optical fiber coupler form an optical fiber M-Z interferometer, and a wavelength scanning light is injected into the optical fiber M-Z interferometer. Magnitudes of three paths of output white light interference spectrum signals are equal, and an angle of 120 degrees is formed between every two paths of output white light interference spectrum signals on the phase. When the wavelength scanning light scans from Lambda 1 to Lambda 2, three paths of output signals I1, I2 and I3 are obtained, and Delta is demodulated through computing or constructing two paths of orthorhombic signals and utilizing a derivation cross multiplying method. The Delta is subjected to the unwrapping operation to demodulate linear phase information after computed. The absolute optical path difference of the interferometer can be computed by using the linear phase information. The invention can absolutely measure the optical path difference of the optical fiber interferometer with high precision and high speed.

A display apparatus which uses a laser to realize a clear image by reducing speckle noise is provided. The display apparatus comprises a laser light source which emits light a scanning mirror which scans light emitted by the laser light source, a speckle removing mirror which periodically reciprocates within a predetermined rotating angle, and projects the light scanned by the scanning mirror, to a screen, and an image processor which processes image data to shift an image by frame corresponding to the rotation of the speckle removing mirror.

To provide an illumination device and a projection type image display device that illuminate an area to be illuminated (image formation area) under conditions where speckle noise is less noticeable.

An illumination device according to the present invention includes: a light source 11 that emits coherent light; an optical scanning section 15 that scans the coherent light emitted from the light source 11; a lens array 22 including a plurality of element lenses and configured to diverge the light scanned by the optical scanning section; an optical path conversion system 23 configured to control a diverging angle of the diverging light to be emitted from respective points of the lens array 22 and to allow the diverging light whose diverging angle has been controlled to illuminate an area to be illuminated sequentially in an overlapping manner.

A projector producing an imaginary input plane with high operability is provided. A projector according to an embodiment projects a VUI screen picture onto a desk, and projects a main projection screen picture to a wall. The projector includes a light receiving element. The light receiving element is arranged in a position where light emitted toward the desk (VUI screen picture) and reflected (or scattered) by an object near the desk enters. The projector calculates a position of the object based on light sensing timing by the light receiving element and light scan positions at various points in time. The projector changes a projected screen picture when it determines that object is simultaneously in contact with a plurality of portions of the VUI screen picture and at least one of contact positions moves.

The invention discloses a stock ground material volume measurement method and system, and the method comprises the steps: S1, obtaining the point cloud data of a stock ground material pile through a laser scanner; S2, extracting color features of the point cloud data, and performing coarse segmentation on a stock ground background region and a stock pile target region according to the color features to obtain point cloud data of the stock pile target region; S3, performing fitting registration on the point cloud data of the material pile target area by adopting a coarse registration method anda fine registration method; and S4, according to the point cloud data obtained through fitting registration, calculating the volume of the material pile by using a mode of combining a Monte Carlo method and an integral method, and completing volume measurement. According to the invention, the volume of the material pile can be rapidly and accurately obtained, automatic measurement of the materialvolume of the material pile is realized, the labor cost is reduced, and the accuracy is high.