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 using specific wavelengthsLEDTo 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 LiDAR is used905nmLaser with a specific wavelength, and surface light sources also have strong emission spectra near this wavelength, can cause interference.

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

1. Light uniformity:<20%；

2. Light instability:<20%；

3. Spot size:0.3*0.3m；

4. Light output energy:5-100%Continuously adjustable;

other requirements

1. in860-950nmThe range is similar to the solar spectrum;

2. in860-950nmThe solar energy standard within the range is equivalent;

3. Light characteristics according to China National Institute of MetrologyAM1.5GThe standard execution standard number isIEC-60904-9-2007.

Application:Simulate strong sunlight at specific wavelengths to interfere with lidar.

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