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 light emitted by a surface light source overlaps with the spectrum of the laser used by the lidar, 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.

This light source can emit infrared light at around 905nm. When the device is 500mm away from the measured radiation surface, the energy in the emission band is close to the energy proportion of the standard solar spectrum in this band; The overall device power is adjustable; The power supply is an LED dedicated driver that can output constant current and voltage, with good conversion efficiency and stability.

Lidar interference surface light sourceMain parameters

LED power: 50-200W;

Lens output angle: 30-120 °;

Main peak wavelength: 905nm;

Input voltage: 220V;

Storage temperature: 0-45 ℃;

Storage humidity: 20-80%;

Storage environment: No large amount of dust, flammable, explosive, and corrosive gas environment.

Application:Simulate outdoor sunlight exposureThe illumination and infrared radiation values under strong light conditions.

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