As a rangefinder, the handheld laser rangefinder has unique functions and characteristics compared with ordinary rangefinders.
The application of DISTO in mines mainly uses the combination of DISTO and domestic theodolites to form a prism-free semi-station, which is used in underground stopes to measure point position, section height, stope volume, etc.
Before a certain unit purchased the DISTO handheld rangefinder, what was the original downhole measurement method? According to a person in charge of the surveying unit: They used theodolite, tape measure, fishing rod and domestic pulsed rangefinder to measure the underground stope. The main disadvantages of this approach:
1. The measurement accuracy is low. There is a set of data to prove it; at the end of 1998, two geological survey teams jointly measured the volume of a stope, and the result was 55,000 cubic meters for one group and 68,000 cubic meters for the other group. Measure one measured value at a time, and the measured values are very different several times, and the result is not dare to continue to measure again.
2. Slow speed and low efficiency. The underground working environment cannot be compared with the surface environment at all. Due to the limitations of poor underground conditions, dark light, and low safety coefficient, the measurement speed is very slow and the efficiency is very low. Often a measurement point costs several times more than the usual measurement time. .
3. Although the domestic pulsed handheld rangefinder can also measure the distance, because it is ultrasonic ranging, people cannot see the position of the target point. In addition, the measuring range is too short and the accuracy is low, which greatly limits its scope of use.
Changes after using DISTO:
In the underground survey, only the surveyor needs to set up a theodolite and a rangefinder, and the target point does not need to stand. The shortcomings of slow speed, low efficiency, and poor accuracy, especially the advantages of hand-held laser rangefinders that can see red laser points in downhole surveys are particularly praised by surveyors. The handheld laser rangefinder can also be used alone in the downhole measurement, which is quite convenient, and can store a large amount of measurement data, without the need for downhole measurement records. In addition to being conveniently used underground, the handheld laser rangefinder can also be used for open-air slope measurement and stakeout.
