How to calibrate the three-axis relationship of the distance detector
During the use of the rangefinder, due to vibrations and collisions during long-term work and transportation, the relationship between the three axes of the rangefinder (telescope aiming axis, rangefinder transmitting axis and receiving axis) often changes. Conventional calibration methods are simple to operate, but the calibration results are not accurate enough.
1. Principle of calibration
By measuring the angle values of the range of the rangefinder's return light signal in the horizontal and vertical directions, we can calculate the correct readings of the dial at the four critical states (the weakest return light signal) when the three-dimensional relationship of the rangefinder meets the requirements. After rotating the micro-screw to the correct reading position of the dial, correct the return light signal of the rangefinder to the critical state so that the corrected sighting mirror mark is in the center of the return light signal range. Take the three-axis relationship calibration of the DI2002 distance meter as an example.
2. Test of horizontal parallelism
(1) Place a reflector about 200m away from the rangefinder, use a telescope to aim at the reflector mark, and read the horizontal dial reading A (145°04'30'').
(2) Slowly rotate the horizontal micro-motion screw of the theodolite to make the sighting direction deviate from the reflector mark to the left, and observe the changes in the return light signal of the rangefinder until the return light signal is in a critical state (the return light signal is between one grid and no signal) (Continuously jumping and changing), read the level reading A (144°57'59'').
(3) Use the same method to measure the horizontal dial reading A (145°07'37'') when it deviates from the critical state on the right side of the reflector mark.
(4) Calculate the horizontal deviation angle according to the following formula:
3. Horizontal parallelism correction
(1) Calculate the correct angle value when deviating from the critical state on the left and right sides of the mirror mark according to the following formula.
