3results about How to "Simple measurement system" patented technology

This invention discloses a method for three-dimensional measurement of irregular particles based on dual-angle defocused interferometric images. A dual-angle laser interferometric image acquisition system is constructed to acquire defocused interferometric images I1 and I2 corresponding to the two detection angles of the irregular particle being measured. Defocused speckle images M1 and M2 are extracted. Reconstructed two-dimensional shape images L1 and L2 are obtained from the defocused speckle images M1 and M2. The reconstructed two-dimensional shape images L1 and L2 are smoothed and thresholded to extract the contour region of the irregular particle, resulting in two-dimensional shape contour region images K1 and K2. Pixel alignment processing is performed on the two-dimensional shape contour images K1 and K2 to obtain smoothed and pixel-aligned dual-angle two-dimensional shape images J1 and J2. Three-dimensional shape reconstruction is performed by projecting the contour images to obtain the three-dimensional point cloud H of the irregular particle to be recovered. This invention has better robustness compared to focused images.

The application discloses a kind of all-fiber high-speed photoelectric detector impulse response measuring device and method, it is characterized in that, including femtosecond laser, optical fiber polarizer, optical fiber delay line, optical fiber circulator, first optical fiber polarization controller, second optical fiber polarization controller, electro-optic sampling head, optical fiber polarization beam splitter, balanced photoelectric detector and lock-in amplifier.Femtosecond laser is branched, and is coupled to photoelectric detector to generate electric pulse signal.A bundle is coupled to optical fiber polarizer, and is sent into optical fiber delay line, first optical fiber polarization controller, optical fiber circulator in turn.Electro-optic sampling head reflects polarized light from optical fiber circulator, while detecting electric pulse signal.It is sent into lock-in amplifier after being converted into electrical signal by balanced photoelectric detector after being sent into optical fiber polarization beam splitter.By connecting each device with polarization maintaining optical fiber, the shortcomings of traditional electro-optic sampling space light system, such as the need for optical alignment, system complexity and instability, are overcome.The measuring system is simple, stable and highly practical.

The invention discloses a vector velocity measurement method and device based on dense array optical fiber probes, and relates to the technical field of laser velocity measurement. According to the invention, one probe is used for realizing the functions of three probes, and the problems that the measurement error is increased and the measurement depth of field is relatively short due to the fact that three probes in each group are not aligned with one point along with the longitudinal movement of the target are solved. The dense array probe vector velocity measuring device consists of a group of three-frequency laser illumination light sources, a dense array optical fiber probe, a set of multi-point PDV system and a data processing system. According to the invention, the measurement of the dense array vector speed can be realized.