Lidar interference surface light source

Lidar interference surface light source

Lidar is a sensor used to detect information such as distance, velocity, and angle of a target. It works by emitting a laser beam and receiving reflected light. Laser beams have high directionality and coherence, which enables lidar to accurately measure parameters such as the position of target objects. For example, in an autonomous vehicle, the laser radar can scan the environment around the vehicle to build a three-dimensional point cloud map, which provides data support for the decision-making of automatic driving of the vehicle.

A surface light source is a type of light source with a relatively large emitting area. The light it emits is distributed at a wide angle in space, which is different from the laser beam characteristics of lidar. Usually, LEDs with specific wavelengths are used to simulate ambient light.

Interference caused by surface light sources

Spectral overlap:If the spectrum of the light emitted by the surface light source overlaps with the spectrum of the laser used by the LiDAR, then the light emitted by the surface light source may be detected by the LiDAR detector. For example, when a laser radar uses a 905nm wavelength laser and a surface light source also has a strong emission spectrum near this wavelength, interference will occur.

Scattering and Reflection:The light emitted by a surface light source may scatter and reflect in the surrounding environment. If these scattered or reflected lights enter the receiving end of the lidar and their intensity is strong enough, they will interfere with the lidar's reception and processing of the reflected light of the laser beam emitted by itself. For example, in a complex indoor environment, the reflected light generated by a surface light source shining on objects such as walls may interfere with the normal operation of a LiDAR.

The Influence of Interference from Surface Light Sources on Lidar

Reduce measurement accuracy: Interference light can cause noise to be mixed in the signal received by the laser radar, resulting in errors in the measured parameters such as distance and angle. For example, when measuring the distance of a target object, the presence of interference light may cause the lidar to incorrectly determine the flight time of the reflected light, resulting in incorrect distance values.

Impact on target recognition: In terms of target recognition, interference light may mask the true reflected light signal of the target object. For example, when a LiDAR attempts to identify a pedestrian in the distance, the interference light from a surface light source may blur the reflected light characteristics of the pedestrian, causing the LiDAR to be unable to accurately recognize the pedestrian's contour, posture, and other information.

Lidar interference surface light sourceMain parameters:

Light source spectrum: including wavelengths such as 850nm, 905n, 940nm, etc., other wavelengths can be customized;

Light source energy density: The energy of the light source in the above frequency band is consistent with the total energy of sunlight in the above frequency band, and the coverage size can be customized according to needs;

Light source power: ≥ 50W;

Light source type: continuous light;

Illumination uniformity: ≥ 80%;

Light source power fluctuation range: output power fluctuation ≤ 0.5db;

Reliability requirement: average usage time of 10000 hours;

Power consumption requirement: The overall power of the machine is within 10KW;

Heating situation: thermal power consumption within 5KW;

Equipped with interfaces that can communicate with the upper computer: RS232/USB/Ethernet ports, which can communicate with the upper computer to control indicators such as light source switches and output power;

Capable of adjusting the power of the light source: continuously adjustable output power;

Working temperature:+10 ℃ to+40 ℃;

Working voltage: 100-240V;

Frequency: 50/60HZ.

If you have any other technical requirements, please contact us and we can customize a solution that meets your needs.