36results about How to "Reduce distance error" patented technology

The invention discloses a high-voltage switch cabinet partial discharge positioning method and system considering temperature field change. The method comprises the following steps: preliminarily positioning a partial discharge source of a high-voltage switch cabinet detected by a TEV detector in a spherical space; adopting m ultrasonic sensors to carry out partial discharge measurement on the high-voltage switch cabinet, and obtaining the propagation time difference between the starting moment of an abnormal sound wave signal collected by the ith ultrasonic sensor and the moment of the strongest TEV signal detected by the TEV detector; calculating a predicted distance between the ith ultrasonic sensor and the partial discharge source according to the spherical space, the propagation time difference and the temperature distribution condition of the ultrasonic propagation path; calculating the coordinate position of the partial discharge source predicted by the ultrasonic sensor based on the predicted distance between the ultrasonic sensor and the partial discharge source; and based on the coordinate positions, predicted by all the ultrasonic sensors, of the partial discharge source, finding an optimal solution, and obtaining the accurate position of the partial discharge source. The method has the advantage of high positioning precision.

The invention discloses a lens position fine-tuning device for a multi-lens panoramic camera. The upper end of the frame is movably connected with the lens position fine-tuning module of the support frame. The present invention is simple in structure and compact in design. By rotating the micro-motion gear to drive the micro-motion rack to move forward and backward in a straight line, the fine-tuning operation of the front and rear positions of multiple lenses can be realized, which is convenient and flexible, and has high adjustment accuracy. Fine-tuning can effectively reduce the distance error between each lens in the imaging system of the panoramic camera and the sensor, and improve the calibration accuracy of the panoramic camera.

The present invention relates to a device which is used for measuring the rotary speed and / or position of the generator component which can rotate around the axial cord without contact, the device isprovided with a circular permanent-magnet encoder which includes a N pole and a S pole which are alternately arranged in the circumference direction and at least two different pole width, the encoderis provided with a scanning head with difference hall transducer, wherein, the encoder is designed to be a double rail encoder (1) with inverse magnetizations; and each sensor element (9, 10) of the difference hall transducer (8) is arranged to one of the encoder rails (4, 5).

The invention relates to a non-ranging positioning algorithm based on corrected simulation curve fitting, and is characterized in that equipment required by the algorithm and implementation steps are as follows: the required equipment is a wireless sensor node group. The wireless sensor node group includes 400 wireless sensor nodes, wherein positions of 80 wireless sensor nodes are known, the 80 wireless sensor nodes are called anchor nodes, and are represented by Node_A(i), i=1,2,...,80, and (Xi, Yi) represents x axis and y axis coordinates of Node_A(i) in a rectangular plane coordinate system; and positions of 320 wireless sensor nodes are unknown, the 320 wireless sensor nodes are called unknown nodes and are represented by Node_U(j), j=1,2,...,320, and (Xj, Yj) represents x axis and y axis coordinates of Node_U(j) in the rectangular plane coordinate system. The non-ranging positioning algorithm based on corrected simulation curve fitting solves the problem of low positioning accuracy in complex environment, and by modification of hop section distance and anchor node selection of an original algorithm, a distance error is reduced, and positioning accuracy is improved.