In recent years, the growing demand for smaller and smarter LiDAR systems has driven innovation in sensor design. As a company deeply engaged in the research and development of LiDAR technology, we at Benewake understand how each sensing component determines the accuracy and reliability of a micro lidar distance sensor. Two of the most discussed photodetector technologies today—SPAD (Single Photon Avalanche Diode) and Avalanche Photodiode (APD)—each play a critical role in compact LiDAR systems. Understanding their differences helps us create sensors that deliver higher precision and efficiency for industrial and mobility applications.

Understanding SPAD Technology in Micro LiDAR Systems

SPAD technology allows the detection of extremely weak optical signals by amplifying single-photon events into measurable electrical pulses. This makes it ideal for short- and mid-range micro lidar distance sensor applications where precision and sensitivity are essential. At Benewake, we integrate SPAD sensors into certain models to enhance real-time performance and improve detection in low-reflectivity environments. SPAD arrays also make it possible to achieve higher resolution without significantly increasing power consumption, which is valuable for compact LiDAR units used in fixed installations such as industrial safety systems or smart infrastructure monitoring.

The Role of Avalanche Photodiodes in Compact LiDAR

Avalanche Photodiodes, on the other hand, operate under a higher reverse bias voltage and generate internal gain when photons strike the semiconductor layer. This property provides strong signal amplification, which is ideal for micro lidar distance sensor designs that must operate over longer distances or under bright outdoor lighting. In our product development, we have observed that APD-based LiDAR modules deliver reliable detection for medium to long-range measurement tasks, including applications like collision avoidance in railway systems, port docking guidance, and infrastructure inspection. Their robustness and proven stability make APDs a dependable choice where high dynamic range and durability are required.

Choosing the Right Photodiode Technology

When developing new-generation compact LiDAR systems, we carefully evaluate the balance between detection distance, energy consumption, and cost. SPAD sensors excel in applications that demand high sensitivity and speed, while APDs offer superior performance in longer-range detection under challenging conditions. The right solution depends on the operational scenario. As a company dedicated to practical and scalable sensing solutions, Benewake continuously explores hybrid designs that combine the advantages of both SPAD and APD technologies within a single micro lidar distance sensor platform.

Our Vision for Smarter LiDAR Solutions

At Benewake, we remain committed to advancing LiDAR technology through innovation, precision, and reliability. Our compact LiDAR products, such as the TFS series, demonstrate how photodiode technology can be optimized to meet real-world demands—achieving balance between size, range, and performance. As we continue refining sensor architectures, we aim to make micro lidar distance sensor technology even more accessible and efficient for industrial automation, smart transportation, and intelligent monitoring systems worldwide.