Method of measuring of exemplary basis of second category for verification of electronic total stations

: pp. 59-65
Lviv Polytechnic National University
Lviv Polytechnic National University
Lviv polytechnic National University
Lviv Ivan Franko National University

Linear-angular intervals method of determining a exemplar basis for category 2 for verification of electronic total stations is proposed in the article. Experimental measurements on exemplary second level the basis were carried out by proposed method. The accuracy of segments, determined by the proposed method, obtained by comparison with direct measurements performed using 0.001 mm precision control meter. During the measurements of the control meter centers of marks were determined within 0.01mm with a special device to force alignment, and to improve the accuracy of the scale the photographic method of fixation of samples was used. Differences of meter intervals of measured reference of basis by control meter in forward and reverse directions, taking into account the temperature range, did not exceed 0.02 mm. Experimental measurements were performed by electronic total station LEICA TCA 2003 and special device created by authors for linear – angular measurements. The device allows you to center a special mark for angular measurements with glued reflective films to measure the distances of the center mark with an accuracy of 0.02 mm. Prior to the measurements preliminary calculations were performed to determined the accuracy and total station instrument adjustments for each brand reflecting each device (using three devices).The proposed method of determining the length of the interval a basis is important distance from the total station to the endpoints of the interval. According to derived formulas we calculated the distance from electronic total station to the appropriate length of the desired interval with a given precision measurements of distances and angles of corresponding total station. In addition we have derived formulas that allowed us to find the allowable difference of shoulders that minimally affect the accuracy of the determining of the total station to the beginning and end of the interval. The total station was installed on calculated distance to the desired interval basis with length of shoulders of permissible differences and measured the centers on marks on special devices created by us.The results confirmed our previously performed calculations. The differences between the segments of the proposed method and measured lengths measured by control meter for meter interval not exceeding 0.14 mm, and ten meter intervals - 0.33 mm and meet the instructional materials. Systematic errors in differences were not found.

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