How to calibrate the three-axis relationship of the distance meter
During the use of the rangefinder, the relationship between the three axes of the rangefinder (telescope sighting axis, rangefinder emission axis, and receiving axis) often changes due to long-term operation and transportation vibrations, collisions, and other factors. The conventional calibration method is simple to operate, but the calibration results are not accurate enough.
principle
By measuring the angle values of the return light signal range in the horizontal and vertical directions of the rangefinder, the correct readings of the dial at the four critical states (weak return light signal *) when the three circle relationship of the rangefinder meets the requirements can be calculated. After rotating the micro spiral to the correct reading position on the dial, calibrate the rangefinder's return light signal to the critical state, so that the calibrated aiming mirror mark is at the center of the return light signal range. Taking the verification of the three-axis relationship of DI2002 rangefinder as an example.
Testing of horizontal parallelism
(1) Place a reflector around 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 spiral of the theodolite, causing the aiming direction to deviate to the left from the reflector mark. Observe the changes in the return light signal of the rangefinder until the return light signal is in a critical state (constantly jumping between one grid and no signal), and then read the horizontal reading A (144 ° 57'59 '').
(3) Using the same method, measure the horizontal dial reading A (145 ° 07'37 '') when deviating from the critical state on the right side of the reflector mark
(4) Calculate the horizontal deviation angle using the following formula:
Horizontal parallelism correction
(1) Calculate the correct angle value when deviating from the critical state on the left and right sides of the reflector mark according to the following formula.
