News center

Measurement Technology, Precise Measurement


25

2023

-

09

The laser is the core component of the laser distance sensor


A laser range sensor is a device that uses laser technology to make measurements and is commonly used in industrial automation, robot navigation, and unmanned vehicles. It usually consists of a laser, an optical system, a photodiode and a signal processing circuit.

The laser is the core component in a laser distance sensor, which is capable of generating a monochromatic, high-power, highly directional laser beam. Commonly used lasers include diode lasers and solid-state lasers. The laser beam emitted by the laser is focused by the optical system to form a fine laser spot for irradiating the object to be measured.

The optical system consists mainly of convex lenses and mirrors, whose function is to focus the laser beam to a smaller spot and to refocus the beam reflected back from the object under test onto the photodiode. The selection and design of the convex lens and reflector have a significant impact on the accuracy and measurement range of the laser distance sensor.

The photodiode is the receiving device of the laser distance measuring sensor, which is capable of converting the light reflected back from the measured object into an electrical signal. Photodiodes are usually made of silicon or germanium materials and are characterised by high sensitivity and fast response. The light signal received by the photodiode changes with the distance of the measured object, and the distance between the measured object and the laser distance sensor can be calculated by measuring the intensity of the light signal received by the photodiode.

Signal processing circuit is an important part of the laser distance sensor, it is responsible for the photodiode received light signal amplification, filtering and digital processing. The signal processing circuit can calculate the distance between the measured object and the sensor according to the intensity and time of the reflected light signal. At the same time, the signal processing circuit can also correct and filter the measurement data to improve the measurement accuracy and anti-interference capability.

In short, a laser distance measuring sensor usually consists of a laser, an optical system, a photodiode and a signal processing circuit. The laser generates a laser beam, the optical system focuses the laser beam on the object to be measured, and refocuses the reflected beam back to the photodiode. The photodiode converts the light signal into an electrical signal, which is processed by the signal processing circuit to obtain information about the distance between the object to be measured and the sensor.

Previous

Next

Previous

Next

News