What is the accuracy of the laser range finder?
The laser range finder is a measuring tool, and the accuracy is an important performance index. The measurement accuracy of the laser range finder generally refers to the specified measurement difference based on the common measurement environment, so is the laser range finder high in accuracy?
There are two ways to use the laser range finder: pulse method and phase method. The laser range finder with pulse emission generally has low absolute accuracy, but it can achieve good relative accuracy when used for long-distance measurement; phase test laser range finder The accuracy of the tachymeter can reach +1 mm.
It should be noted that the accuracy error of the laser rangefinder is not proportional to the measured distance, and it is the same over the entire distance, but if the distance is too long, the error will increase by +0.5mm/100m.
1. Advantages of laser range finder
The sensor of the laser rangefinder is just a light spot, whether it is a small hole or a distant object, it can be used, and the response time of the laser is very fast, so it can be used for rapid measurement, surrounded by target materials , color, tilt, etc., to achieve accurate measurement.
2. Disadvantages of laser range finder
If there is water and dust on the surface of the laser rangefinder, the light will be emitted back, resulting in false signals; moreover, the laser is harmful to human eyes, and it is dangerous to use.
What is the principle of infrared rangefinder
Infrared range finder is a kind of laser range finder, but it is different from ordinary laser range finder, it uses invisible infrared light as the measurement light source for distance measurement, its principle is essentially the same as that of laser range finder , but with some minor differences:
The infrared rangefinder mainly adopts the principle of non-diffusion when infrared rays propagate. Since the refractive index of infrared rays when passing through many substances is much lower than that of ordinary light, the infrared rangefinder mainly uses the principle of non-diffusion when infrared rays propagate. Principle, because the refractive index of infrared rays when passing through many substances is much lower than that of ordinary light, therefore, many ranging tools will use infrared rays to measure precise targets. The main principle of infrared rangefinders is that infrared rays travel from The distance of the target can be accurately calculated by taking the time it takes for the rangefinder to meet the reflector and be reflected back after it is sent out, and then comprehensively consider the propagation speed of infrared rays.
The working process of the infrared rangefinder is: the modulation signal frequency f generated by the main control oscillator (namely the main vibration) is amplified and then added to the GaAs light-emitting tube, and then emitted by the current modulation
Infrared modulated light exits from the transmitting optical system and shoots to the reflective mirror of the mirror station. After reflection, the returned light is received by the receiving optical system, reaches the silicon photosensitive diode, and passes through the light source.
Electrically converted to obtain a high-frequency ranging signal. In the automatic infrared rangefinder, a logic command circuit is set for program control.
