With the rapid development of large-scale geometric measurement technology,long-distance photoelectric distance measuring instruments are more widely used in production and daily life,and the demand for their traceability is increasingly urgent.Currently,the verification of this kind of instrument is mainly carried out through the field baseline,which is vulnerable to external interference and has low stability,poor repeatability and low detection efficiency.And most domestic metrology institutes are lack of field baseline detection conditions.Therefore,it is necessary to establish indoor virtual length baseline field.At present,the indoor baseline field is usually established by right angle prism,corner cube prism,optical fiber and other devices.Due to the shortcomings of the existing methods,such as small measurement range,difficult calibration,poor continuous measurement ability and so on,the plane mirror is selected as the optical path folding device to establish the 100m and 200m indoor baseline field on a 50m high-precision guide rail.And the standard baseline length value is obtained through calibration.Based on the above method,the indication error of Leica DISTOTMD510hand-held laser rangefinder is verified.The main researches are as follows:(1)A 100m baseline is built by plane mirror group method,and an optical path adjustment method based on reflection target is proposed to ensure the parallelism of optical path and improve the continuous measurement ability of baseline system.Total station and dual frequency laser interferometer are regarded as length reference.A new optical path calibration method whose feasibility is verified by experiments is proposed,which can improve the efficiency of baseline length calibration.(2)The optical structures of plane mirror group method and plane mirror method are designed to realize the construction of 200m baseline.The main measurement errors of the two methods are analyzed theoretically and simulated by ZEMAX,which shows whether the theoretical results are consistent with the simulation results.According to the error analysis results,some errors can be effectively controlled and the baseline building accuracy can be improved.The two methods are compared in terms of the number and diameter of the required plane mirrors,the influence of errors,etc.(3)A 200m baseline is built by plane mirror method,and an optical path adjustment method based on two apertures is taken.A plane mirror offset method is also proposed to effectively utilize the plane mirror aperture,thus reducing the research cost.A direct calibration method using total station is adopted to ensure high calibration accuracy.(4)100m and 200m baselines are used to verify the indication error of rangefinder in 0.05m-100m and 100m-200m sections respectively.The expanded uncertainties of the baseline length calibration results in the two sections are 1.8mm and 2.0mm(k(28)2),and their calibration results are 2.700mm and 9.3mm with expanded uncertainties of 2.0mm and 2.2mm(k(28)2)respectively.Therefore,the accuracy of the verification system is high,and the measurement range can reach 200m,which effectively solves the problem of establishing the measurement standard of length over 50m.Besides,the continuous measurement ability of 100m baseline system is strong,and the optical path calibration efficiency is high,which is conducive to the breakthrough of"indoor outdoor detection".In conclusion,the research of this subject has outstanding theoretical value and practical significance. |