The distinction between a laser rangefinder and an infrared rangefinder
As a precision measurement tool, infrared range finder has been widely used in various fields. Range finders can be divided into ultrasonic range finders, infrared range finders, and laser range finders. The so-called infrared rangefinder refers to the laser infrared rangefinder, that is, the laser rangefinder. Infrared rangefinder----an instrument that uses modulated infrared light for precise distance measurement, and the measurement range is generally 1-5 kilometers.
It uses the principle of non-diffusion when infrared rays propagate. Because infrared rays have a very small refractive index when passing through other substances, long-distance rangefinders will consider infrared rays, and the propagation of infrared rays takes time. Received, and then the distance can be calculated according to the time from sending out to being received and the propagation speed of infrared rays, so the industry is called laser infrared photoelectric range finder, and its magnet is a special strong magnetic permanent magnet.
The modulated signal frequency f generated by the main control oscillator (namely the main oscillator) is amplified and added to the GaAs light-emitting tube, and the infrared modulated light is emitted through current modulation, and emitted from the emission optical system to the reflector of the mirror station, after reflection , the return light is received by the receiving optical system, reaches the silicon photosensitive diode, and undergoes photoelectric conversion to obtain a high-frequency ranging signal.
In the automatic infrared rangefinder, a logic command circuit is set for program control. The novel range finder developed in recent years uses a microprocessor system, which not only can complete the above-mentioned program control, but also develops other automatic test functions, including various methods of distance measurement, reduction and self-test, etc. , very convenient to use.
Principle of Laser Range Finder
A laser rangefinder is an instrument that uses a certain parameter of a modulated laser to measure the distance to a target. The measuring range of the laser range finder is 3.5~5000 meters.
According to the distance measuring method, it is divided into phase method range finder and pulse method range finder. The pulse laser range finder emits a beam or a series of short pulse laser beams to the target during operation, and the photoelectric element receives the laser reflected by the target. The timer measures the time from launch to reception of the laser beam, and calculates the distance from the observer to the target. The phase method laser rangefinder detects the distance by detecting the phase difference between the emitted light and the reflected light when it propagates in space. The laser range finder is light in weight, small in size, easy to operate, fast and accurate, and its error is only one fifth to one hundredth of that of other optical range finders. The picture on the right is a typical phase method range finder and pulse method rangefinder diagram.
The laser range finder is an instrument that uses a certain parameter of the modulated laser to accurately measure the distance of the target. The pulsed laser rangefinder emits a beam or a sequence of short-lived pulsed laser beams to the target when it is working, and the photoelectric element receives the laser beam reflected by the target. The timer measures the time from the launch to the reception of the laser beam, and calculates The distance from the meter to the target.
The difference between infrared range finder and laser range finder
Infrared ranging is a kind of laser ranging.
There are two types of laser ranging:
1) Red light laser ranging (also known as visible light ranging).
2) Infrared laser ranging.
Both are collectively referred to as laser ranging.
There is another ultrasonic range finder on the market, which is often pretended to be an infrared range finder or a laser range finder by sellers. Be careful not to be fooled.
The method to distinguish laser range finder from ultrasonic range finder is:
Laser range finders (whether red light or infrared light) have at least one optical lens, and some have two optical lenses, one large and one small.
