Laser rangefinder, as a high-precision, high-speed measuring tool, has a simple and efficient working principle. Below, we will discuss in detail how laser rangefinder works.
1. Laser emission
The operation of laser rangefinder begins with the emission of laser. The laser rangefinder is equipped with a laser transmitter inside, which is responsible for emitting a short and intense laser pulse. This laser pulse has a high frequency and a short pulse width, and can reach the target object in a very short time.
2. Laser reflection
When the laser pulse is irradiated on the target object, part of the laser energy will be absorbed by the target object, and part of the laser will be reflected back. The reflected laser beam will carry the distance information about the target object.
3. Laser reception
The laser rangefinder is also equipped with a receiver to receive the reflected laser beam. This receiver can filter out unnecessary light and only receive the reflected laser pulse corresponding to the laser pulse emitted by the laser transmitter.
4. Time measurement
Once the receiver receives the reflected laser pulse, the high-precision timer inside the laser rangefinder will stop timing. This timer can accurately record the time difference Δt from the emission to the reception of the laser pulse.
5. Distance calculation
With the time difference Δt, the laser rangefinder can calculate the distance between the target object and the laser rangefinder through a simple mathematical formula. The formula is: distance = (speed of light × Δt) / 2. Since the speed of light is a known constant (about 300,000 kilometers per second), the distance can be easily calculated as long as the time difference Δt is measured.
The working principle of the laser rangefinder is to emit laser pulses, measure the time difference from emission to reception, and then use the product of the speed of light and the time difference to calculate the distance between the target object and the laser rangefinder. This measurement method has the advantages of high precision, high speed and non-contact, making laser rangefinders widely used in various fields.
