Quick measurement range finder

Abstract

The invention discloses a quick measurement range finder which comprises a bicycle body and a range finding device which is mounted on the bicycle body. The range finding device comprises a miniature electronic counter, a plurality of magnets and an induction coil in mutual magnetic induction, wherein the plurality of magnets are mounted on steel wires on the rim of a front wheel of the bicycle and are equidistantly distributed on the circumference at the same height. The induction coil is mounted on a front bumper of the bicycle. The height of the induction coil is same with that of the magnet. Mutual induction between the magnets and the induction coil can be realized without contact. The miniature electronic counter is mounted on the handle of the bicycle and is connected with the induction coil through a lead. Along with riding of the bicycle, successive induction between the plurality of magnets and the induction coil is realized and furthermore counting is performed through the miniature electronic counter. Consistency between a front sight distance and a back sight distance is ensured through ensuing consistency of counting numbers which are measured in two times.

Description

technical field [0001] The invention relates to a distance measuring instrument, in particular to a fast measuring distance measuring instrument. Background technique [0002] In the leveling measurement, the front and rear sight distances need to be equal to improve the measurement accuracy. The existing conventional method is to measure the distance by using the same number of steps of the running ruler. This method is greatly influenced by human beings, error-prone and poor in accuracy; or Use a tape measure to determine the front and rear sight distances. This method can meet the leveling requirements, but the tape measure requires two people at the same time, which is greatly disturbed by the on-site road conditions and the efficiency is low; or use a hand-push rangefinder to read through the counter. To determine the distance, this method is easy to operate and has high precision, but it needs to be carried out by surveyors, and it is not suitable for long-term work, a...

AI Technical Summary

Problems solved by technology

[0002] In the leveling measurement, the front and rear sight distances need to be equal to improve the measurement accuracy. The existing conventional method is to measure the distance by using the same number of steps of the running ruler. This method is greatly influenced by human beings, error-prone and poor in accuracy; or Use a tape measure to determine the front and rear sight distances. This method can meet the leveling requirements, but the tape measure requires two people at the same time, which is greatly disturbed by the on-site road conditions and the efficiency is low; or use a hand-push rangefinder to read through the counter. To determine the distance, this method is simple to operate and has high precision, but it needs to be carried out by surveyors, which is not suitable for long-term work, slow speed and low efficiency

[0003] To sum up, the existing methods and devices for measuring front and rear distances are relatively simple, with poor anti-interference effect, low efficiency, or low precision.

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