The structure of the rangefinder
1. coaxial telescope
The telescope of the total station realizes the coaxiality of the line-of-sight axis, the emission of the ranging light wave, and the receiving optical axis. The basic principle of coaxialization is: install a beam splitting prism system between the telescopic objective lens and the focusing lens, and realize the multi-function of the telescope through this system, that is, aim at the target, make it image on the reticle, and measure the angle. At the same time, the external optical path system of the distance measuring part can make the modulated infrared light emitted by the photosensitive diode of the distance measuring part reflect back through the same path after being shot to the reflective prism through the objective lens, and then the returned light is received by the photodiode through the action of the dichroic prism ;In order to measure the distance, it is necessary to set up an inner optical path system inside the instrument. The modulated infrared light emitted by the photosensitive diode is transmitted to the photodiode for reception through the optical fiber in the beam splitting prism system, and the phase of the light is modulated by the inner and outer optical paths. The difference indirectly calculates the travel time of light and calculates the measured distance.
The coaxiality enables the telescope to realize the measurement function of measuring all basic measurement elements such as horizontal angle, vertical angle and oblique distance at the same time. Coupled with the powerful and convenient data processing function of the total station, the total station is extremely convenient to use.
2. Biaxial automatic compensation
The principle of dual-axis automatic compensation has been introduced in the inspection and calibration of the instrument. If the longitudinal axis of the total station is tilted during operation, it will cause angle observation errors, and the observation values of the left and right sides of the face cannot be offset. The unique dual-axis (or single-axis) tilt automatic compensation system of the total station can monitor the tilt of the longitudinal axis, and automatically correct the angle measurement error caused by the tilt of the vertical axis in the reading of the dial (some total The maximum inclination of the longitudinal axis of the station instrument is allowed to ±6′). , the angle error caused by the tilt of the vertical axis can also be automatically calculated by the microprocessor according to the correction formula of the vertical axis tilt, and added to the reading of the dial to correct it, so that the reading displayed on the dial is the correct value, that is, the so-called vertical axis tilt Automatic compensation.
3. the keyboard
The keyboard is the hardware for the total station to input operation instructions or data during surveying. The keyboard and display screen of the total station instrument are double-sided, which is convenient for operation during forward and backward operations.
4. memory
The function of the total station memory is to store the measurement data collected in real time, and then transmit them to other devices such as computers for further processing or utilization. The memory of the total station has two types: internal memory and memory card.
The internal memory of the total station is equivalent to the internal memory (RAM) of the computer, and the memory card is an external storage medium, also known as a PC card, which is equivalent to the disk of the computer.
5. Communication Interface
The total station can input the data stored in the memory into the computer through the BS-232C communication interface and communication cable, or transmit the data and information in the computer to the total station through the communication cable to realize two-way information transmission.
