However, ultrasonic sensors are sensitive to interference from environmental noise, and their detection ranges can be more limited than LiDAR. Ultrasonic sensors like the TSPC-30S1-232 from Senix can complement LiDAR and other sensors for AMR SLAM and safety. It has an optimum range of 3 meters, compared to 5 meters for the 2D LiDAR and 12 meters for the 3D LiDAR detailed above. This temperature-compensated ultrasonic sensor is IP68-rated in an environmentally sealed stainless- steel enclosure (Figure 3). Sensor fusion usually refers to using several discrete sensors. But in some cases, multiple sensors are co-packaged as a single unit.
The HPS-3D160 3D LiDAR sensor from Seeed Technology integrates high-power 850 nm infrared vertical-cavity surface- emitting laser (VCSEL) emitters and high-photosensitive CMOS.
The embedded high-performance processor includes filtering and compensation algorithms and can support multiple simultaneous LiDAR operations. The unit has a range of up to 12 meters with centimeter accuracy. When a 2D LiDAR solution is needed, designers can turn to the TIM781S-2174104 from SICK. It features an aperture angle of 270 degrees with an angular resolution of 0.33 degrees and a scanning frequency of 15 Hz. It has a safety-related working range of 5 meters (Figure 2). Ultrasonic sensors can accurately detect transmissive objects like glass and light-absorbing materials that LiDAR can't always see. Ultrasonic sensors are also less susceptible to interference from high dust, smoke, humidity, and other conditions that can disrupt LiDAR.
Figure 2: This 2D LiDAR sensor has an aperture angle of 270 degrees. (Image source: SICK)
Figure 3: Environmentally sealed ultrasonic sensor with an optimum range of 3 meters. (Image source: DigiKey)
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