Why does LiDAR use 905nm and 940nm bands?

Lasers with a wavelength of 905nm exhibit strong scattering and absorption capabilities in the atmosphere. This makes 905nm lidar safer for short-range ranging and obstacle avoidance applications, as its relatively short illumination distance meets the safety regulations for laser products to a certain extent.
By WenYiLin
2 min read
LRF

The reasons for lidar systems utilizing the 905nm and 940nm wavelength bands are primarily as follows:

Firstly, for the 905nm band, laser light at this wavelength exhibits strong scattering and absorption capabilities in the atmosphere. This characteristic makes 905nm lidar safer for short-range ranging and obstacle avoidance applications, as its illumination distance is relatively shorter, thereby satisfying, to a certain extent, the safety regulations for laser products. Furthermore, lidar operating in the 905nm band is not subject to particularly stringent restrictions and regulations in some regions, which also provides greater convenience for its practical applications.

Why does LiDAR use 905nm and 940nm bands?
Secondly, for the 940nm wavelength band, light at this wavelength exhibits high tissue penetration capability and excellent blood vessel visualization. Although these characteristics are more evident in medical applications, they also confer certain advantages to 940nm lasers in detecting and identifying targets. Furthermore, light in the 940nm band possesses good deep penetration ability and high spatial resolution, which are crucial for lidar in detecting and recognizing distant or small targets.
Why does LiDAR use 905nm and 940nm bands?
In general, the selection of 905nm and 940nm bands for LiDAR (Light Detection and Ranging) is due to their comparative advantages in terms of safety, regulatory compliance, and detection performance. However, the specific choice between these bands depends on the particular application scenario and requirements. In practical applications, the most suitable band may be chosen based on the specific circumstances to achieve optimal detection results.
Please note that while the above provides a general explanation, the specific technical choices may vary depending on different LiDAR manufacturers and application scenarios. Therefore, in specific applications, it is recommended to refer to relevant technical documentation or consult professionals for more accurate information.
ERDI TECH LTD develops and produces the LRF200A Series Laser Radar High Repetition Rate Range Finder Module. The LRF200A is a high-precision, long-range laser radar ranging module that is suitable for both indoor and outdoor applications. It excels in positioning or collision avoidance monitoring for shuttle cars, land transport vehicles, overhead cranes, and laterally moving vehicles. Its stable measurement capabilities and ability to detect extremely dark or shiny materials ensure it meets the demands of applications such as thrust control, shelf occupancy, or load height control in logistics. The product's technical specifications guarantee it satisfies application needs, while its ultra-compact size and superior specifications ensure outstanding performance in any scenario. The main technical specifications are as follows:

Project Name

Technical parameters

Laser Light Source

Laser diode 905nm, ≤10mW; Class I laser eye safety requirements

Spot Area

20×10cm（100m）

Weight

＜50g

Power Supply Voltage

24V（9V~36V）

Specification Range

0.05-50m

0.05-100m

0.05-150m

0.05-200m

Measurement Accuracy

±0.05m

±0.05m + (L-50) × 0.1%, where L is the measurement distance

Standard Measuring Range

0.05m ~ 200m @ 80% reflectivity & visibility > 10km

Distance Resolution

1cm

Absolute Accuracy

±0.05m@50m

Output Interface

3.3V TTL serial port output

Measurement Frequency

20-20kHz (default 1kHz)

Return Data

Direct measurement of distance, reflected light intensity, and working status

Operating Temperature

－40℃~ +85℃

Storage Temperature

－45℃~ +100℃

Operating Humidity

0%~100% RH

Anti-ambient Light

＞100kLux

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