3results about How to "Correct measurement error" patented technology

This invention discloses a non-contact tire deformation recognition method based on a fine-tuned large-scale visual model. The method includes calibrating a monocular high-speed camera, fine-tuning the parameters of the mask decoder of the large-scale visual model using a tire image dataset, generating a point coordinate cue sequence based on pixel calculation using OpenCV, inputting the cue sequence into the fine-tuned large-scale model for segmentation, further processing the pixel matrix using OpenCV to generate a point cue sequence, and post-processing using iterative geometric fitting and region growing algorithms to obtain the mechanical deformation parameters of the target sample tire. This invention can achieve accurate and rapid tire deformation recognition, reaching pixel-level precise segmentation. It solves the problems of large errors, limited measurement environments, nonlinear image distortion caused by cameras, weak generalization ability, and high training costs in existing computer vision-based vehicle tire recognition methods.

The disclosure provides a method for measuring optical axis deflection angle and translation amount suitable for laser tracker error correction, comprising: a laser tracker emits an initial laser beam, the initial laser beam exits onto a position sensitive detector to form a light spot, the position of the light spot has corresponding two-dimensional coordinate information; the position sensitive detector is placed at a plurality of different distances away from the laser tracker in turn, and a plurality of pairs of position coordinates of light spots formed by a positive mirror measurement light path and an inverted mirror measurement light path on the position sensitive detector corresponding to the plurality of different distances are obtained; according to the position coordinates of each pair of light spots, the relative distance between the position coordinates of each pair of light spots is obtained; according to a plurality of relative distances and different distances, the relative position relationship between the intersection of the horizontal axis and the vertical axis of the laser tracker and the intersection of the positive mirror measurement light path and the inverted mirror measurement light path, and the optical axis deflection angle and the translation amount suitable for laser tracker error correction are obtained.

The invention belongs to the technical field of fuel cells, and particularly relates to a fuel cell flow velocity field on-line test device and method, and the device comprises a separation plate and a flow velocity measurement plate which are arranged in a stacked manner. Flow velocity sensors are assembled on the upper surface of the flow velocity measuring plate in an array mode. A signal channel and a current channel are formed in the flow velocity measuring plate, and the signal channel is formed in the position of the flow velocity sensor; the lower surface of the flow velocity measuring plate is provided with a cooling water flow field. A mounting hole for penetrating through the flow velocity sensor and an air hole are formed in the partition plate; the upper surface of the partition plate is provided with a cathode gas flow field; the device is provided in place of a bipolar plate in a fuel cell. Compared with the prior art, the problems that in the prior art, a test structure is complex, and a test result highly depends on the precision of a calculation model are solved. According to the scheme, on-line measurement of flow velocity field distribution in the fuel cell is achieved, the device can replace a bipolar plate to be assembled at any cell, and testing is flexible.