10 results about "Laser rangefinder" patented technology

The invention relates to a method for measuring tunnel lining cracks. The method comprises the following steps of: acquiring an image of a crack by a digital camera and measuring the acquisition distance by a laser ranger; selecting an area needing to be measured from the acquired image so as to prevent processing deviation due to excessively big picture and relatively small target crack, and changing the selected area into a gray image; determining a threshold for the selected gray image and performing binarization image division to obtain a target area; extracting a white area only comprising the crack from the target area; extracting the border of the crack to obtain a border graph; calculating the pixel width of the crack by a minimum distance method; and obtaining the actual width of the crack according to a predetermined calibration proportion between the actual pixel size and the photographing distance. The method has the advantages of low cost, high speed, convenient carrying and high measurement precision.

The invention discloses a high-precision coming vehicle and running vehicle detection system. The system comprises two laser range finders, a data receiving module, a front-end processing module and astate conversion module which are arranged along the traveling direction of a train; the data receiving module is connected with the two laser range finders respectively, associates the received distance data with the IDs of the laser range finders and the real-time timestamps respectively, and stores qualified data as an original data packet through data verification; the front-end processing module performs data filtering on the received original data packet, and judges whether the corresponding laser range finder is shielded or not according to the distance data, and adds records to form adata packet I; and the state conversion module converts the current system state among idleness, pre-triggering, triggering and post-triggering according to the data in the data packet I in combination with the current system state. The high-precision coming vehicle and running vehicle detection system can effectively eliminate the situations of backing, parking and the like, accurately and efficiently complete the collection of coming vehicle and running vehicle signals, and can provide accurate coming vehicle and running vehicle signals for a test system.

The invention discloses a spiral welded pipe forming position pipe diameter perimeter monitoring system which comprises a bottom plate, a horizontal sliding rail, a sliding bottom plate, a horizontaladjusting electric cylinder, a stand column, an mounting frame sliding rail, an mounting frame, a supporting wheel, a center shaft, a calibration disc, an inner frame sliding groove, an up-down adjusting electric cylinder and an inner frame.Sliding rails are fixed to the left and right of the top of the bottom plate. The sliding bottom plate slides in the left-right direction of the sliding railsthrough a bottom horizontal adjusting electric cylinder, stand columns are vertically fixed to the left side and the right side of the top of the sliding bottom plate, vertical mounting frame slidingrails are fixed to the front portions and the rear portions of the stand columns correspondingly, and the front mounting frame and the rear mounting frame slide up and down along the mounting frame sliding rails. Riding wheels are fixed in the middle of the mounting frames; and the calibration disc is placed on the front and rear riding wheels through a central shaft. Alarm is performed if the tolerance range is exceeded, the alarm is fed back to production equipment for adjustment, measurement is rapid and accurate, the high-speed laser range finder mounting plate is provided with the V-shaped positioning pin, and rapid and accurate positioning and mounting can be achieved.