Working Principle of Infrared Distance Meter
Infrared rangefinder, as a precise measuring tool, has been widely used in various fields. Distance measuring instruments can be divided into ultrasonic distance measuring instruments, infrared distance measuring instruments, and laser distance measuring instruments. The infrared rangefinder referred to is a laser infrared rangefinder, also known as a laser rangefinder. Infrared rangefinder - an instrument that uses modulated infrared light for precise distance measurement, with a range of generally 1-5 kilometers.
Infrared rangefinder, also known as "infrared photoelectric rangefinder". Phase based photoelectric rangefinder with infrared light as the light source. Gallium arsenide light-emitting diodes are commonly used as light sources, and their light intensity varies with the injected electrical signal, thus serving as both a light source and a modulator. Its measuring range is relatively short, mostly within 5 kilometers. Due to the semiconductor nature of the infrared rangefinder light source, the gradual integration of electronic circuits, and the automation of the ranging process, the instrument has the advantages of small size, light weight, easy operation, fast ranging speed, and high accuracy. Widely used in water conservancy, mining, urban planning, and military engineering surveying.
The working principle is as follows:
It utilizes the principle of non diffusion during infrared propagation. Because the refractive index of infrared rays is very small when passing through other substances, long-distance rangefinders will consider infrared rays, and the propagation of infrared rays takes time. When infrared rays are emitted from the rangefinder, they are reflected back by the reflector and received by the rangefinder. Based on the time from emission to reception of infrared rays and the propagation speed of infrared rays, the distance can be calculated. Therefore, the industry is called laser infrared photoelectric rangefinder, and its magnetic steel is a special strong magnetic permanent magnetic steel.
The modulation signal frequency f generated by the main oscillator (i.e. the main oscillator) is amplified and applied to a GaAs light-emitting tube. It is modulated by current to emit infrared modulated light, which is then emitted from the transmitting optical system to the mirror station. After reflection, the return light is received by the receiving optical system and reaches the silicon photodiode. After photoelectric conversion, a high-frequency ranging signal is obtained.
In automated infrared rangefinders, logic instruction circuits are set up for program control. In recent years, novel rangefinders have been developed using microprocessor systems, which can not only complete the program control mentioned above, but also develop various other automatic testing functions, including various methods of ranging, calculation, and self testing, making it very convenient to use.
