How to calibrate the relationship between the three axes of the rangefinder
Rangefinder In the process of use, due to long-term work and transport vibration, collision, rangefinder three-axis (telescope illumination axis, rangefinder launch axis and acceptance of the axis) relationship often changes. Conventional calibration methods are simple to operate, but the calibration results are not accurate enough.
1. Principle of calibration
By determining the rangefinder in the horizontal and vertical return signal range of angular value, the rangefinder is deduced to meet the requirements of the perimeter of the rangefinder relationship between the four critical state (return signal * weak) position of the dial correct readings. Rotate the micro-rotary screw to the correct reading position of the dial, calibrate the rangefinder back to the critical state of the light signal, so that the corrected illumination mirror mark in the centre of the range of back to the light signal. DI2002 rangefinder three-axis relationship calibration as an example.
2. Horizontal parallelism test
(1) In the rangefinder 200m or so to place the reflector, using the telescope to illuminate the reflector sign, read the horizontal disc reading A (145 ° 04 '30'').
(2) Slowly rotate the horizontal microscrew of the warp beam to make the direction of illumination deviate from the reflector mark to the left, and observe the change of the Retroreflector signal of the rangefinder until the Retroreflector signal is in the critical state (the Retroreflector signal is in the constant jumping change between one frame and no signal), and then read the horizontal degree reading A (144°57'59'').
(3) Determine the horizontal degree disc reading A (145°07'37'') when the critical state to the right of the deviating reflector sign is determined by the same method.
(4) Calculate the angle of deviation in the horizontal direction according to the following formula:
3. Horizontal parallelism correction
(1) Calculate the correct angular value for deviation from the critical state to the left and right of the reflector mark according to the following formula.
