5 results about "Position sensitive device" patented technology

The invention provides a rapid calibration method and system for angle measurement precision of a laser seeker. The method comprises the following steps: emitting a laser beam to a calibration rod array through a laser seeker, and collecting the displacement of a laser spot reflected by the surface of each calibration rod through a position sensitive device; inputting the laser spot displacement into a spot displacement feature extraction network, and generating an angle and displacement time sequence containing a timestamp; identifying abnormal sampling points in the angle and displacement time sequence; and performing geometric reconstruction on the abnormal sampling points by adopting a space geometric constraint optimization algorithm and combining a fixed space included angle constraint relation to obtain angle measurement error calibration parameters of the laser seeker. According to the technical scheme provided by the invention, the high-precision dynamic calibration of the angle measurement error of the laser seeker is realized through the collaborative analysis of the space coordinates of the calibration rod and the displacement of the laser spot in combination with the neural network and geometric constraint optimization.

A mechanism for tracking an approximate position of a desired light beam. An optical system is configured to derive one or more first positions of one or more incident light beams from data produced by a position-sensitive device and one or more second positions of one or more incident light beams from image data produced by an image sensing arrangement. A tracking system processes the first position(s) and the second position(s) to determine or identify a position of the desired light beam.

The application provides a kind of laser seeker angle measurement precision fast calibration method and system.Therein, the method includes: by laser seeker emitting laser beam to the calibration rod array, and by position sensitive device collection each calibration rod surface reflected laser spot displacement amount;The laser spot displacement amount is input into spot displacement feature extraction network, and the angle and displacement time sequence containing time stamp are generated;Abnormal sampling points in angle and displacement time sequence are identified;Using spatial geometric constraint optimization algorithm, combined with fixed space angle constraint relationship, abnormal sampling points are geometrically reconstructed, and the angle measurement error calibration parameter of laser seeker is obtained.The technical scheme provided by the application realizes high-precision dynamic calibration of laser seeker angle measurement error through cooperative analysis of calibration rod space coordinates and laser spot displacement, combined with neural network and geometric constraint optimization.

The invention provides a low-cost laser displacement sensor based on a PSD. According to the sensor, a one-dimensional PSD (position sensitive device) is adopted as a photoelectric device, light spot change is directly converted into current output, and complex imaging waveform positioning calculation is avoided; a simple ARM is adopted as a processor, only simple operation is needed, and complex calculation of waveform positioning is avoided; a reflector is adopted to carry out turn-back layout on a light path, so that the volume and material consumption of the sensor are reduced; the laser, the focusing mirror, the imaging mirror, the reflecting mirror and the PSD device are simultaneously fixed by adopting the integrated connecting plate, so that the performance is stable and reliable, the assembly is convenient and fast, and the production efficiency is improved. The sensor can effectively solve the problem of high cost of a laser displacement sensor, the reduction amplitude of the measurement precision is limited, the measurement speed can be multiplied, the size is obviously reduced, the implementation cost is low, the cost performance is high, and the sensor has wide practicability and universality.

The invention discloses a device for on-line calibration of a double-shaft relative motion posture, and the device comprises a laser length measuring device and a photoelectric receiving device which are respectively fixed on a calibrated double shaft, the laser length measuring device comprises a laser displacement sensing unit, a front-end three-dimensional micro-displacement adjusting workbench and a front-end clamping and fixing assembly, the photoelectric receiving device comprises a lens, a rear-end three-dimensional micro-displacement adjusting workbench and a rear-end clamping and fixing assembly, and the laser displacement sensing unit comprises a laser displacement sensor and is used for measuring the displacement variation in the X-axis direction; the lens comprises a two-dimensional position sensitive device which is used for measuring displacement variation in the Y-axis direction and the Z-axis direction. The front-end three-dimensional micro-displacement adjusting workbench and the rear-end three-dimensional micro-displacement adjusting workbench respectively comprise micrometer heads in three directions and crossed roller guide rails, and the laser displacement sensor and the two-dimensional position sensitive device can pass through the crossed roller guide rails to achieve micro-movement in the three directions. According to the invention, real-time measurement and online calibration of double-shaft relative motion attitude parameters can be realized.