The main difference between solid-state LiDAR and mechanical LiDAR lies in their scanning mechanisms and mechanical structures. Solid-state LiDAR generally uses electronic beam steering or area-array detection to collect environmental data, while mechanical LiDAR relies on moving components such as rotating mirrors, prisms, or other mechanical assemblies to change the laser beam's scanning direction.
The two technologies differ in structural design, detection range, scanning accuracy, reliability, and maintenance requirements. The appropriate type depends on the installation space, detection range, target recognition requirements, and operating environment.
Advantages of Solid-State LiDAR
Solid-state LiDAR offers advantages in system integration and reducing the number of mechanical moving components. Its main characteristics include:
Higher reliability: Some all-solid-state LiDAR systems do not rely on large mechanical rotating assemblies for scanning. This reduces mechanical wear and the possibility of failures associated with moving components, which can improve long-term reliability and vibration resistance. However, the mechanical structure varies between different technologies.
Lower maintenance requirements: By eliminating traditional rotating scanning mechanisms, some solid-state LiDAR systems require less routine maintenance and fewer mechanical component replacements. This reduces the maintenance work associated with mechanical transmission systems.
Compact structure: Solid-state LiDAR can use an integrated design that reduces the space required by traditional mechanical scanning assemblies. This makes it easier to install in autonomous vehicles, drones, and other equipment with limited installation space.
Flexible data acquisition: Different solid-state technologies use different scanning methods. For example, Flash LiDAR uses an array of photodetectors to capture the entire field of view in a single exposure. This approach is suitable for applications that require rapid scene acquisition.
It is worth noting that not all solid-state LiDAR systems are completely free of moving components. MEMS LiDAR still uses micromirrors to steer the laser beam, while technologies such as Flash and OPA can operate without mechanical scanning assemblies. Reliability and motion characteristics must therefore be evaluated according to the specific design.
Disadvantages of Solid-State LiDAR
Although solid-state LiDAR offers advantages in system integration, its detection performance and manufacturing cost still depend on the specific technology used.
Higher manufacturing cost in some designs: Solid-state LiDAR systems involve laser emitters, optical components, detector arrays, and electronic control systems. Some architectures require complex optical designs, chip integration, and manufacturing processes, which can increase production costs.
Limitations in detection range: Detection range varies considerably between solid-state LiDAR technologies. In Flash LiDAR, the system illuminates the entire field of view simultaneously, so each detector pixel may receive only a limited amount of returned light. This can reduce the signal-to-noise ratio and limit long-range detection. Other solid-state designs can achieve longer detection ranges, so this limitation does not apply to all solid-state LiDAR systems.
Resolution constraints: For some LiDAR systems that use area-array detectors, spatial resolution depends on the number and density of detector pixels. Applications involving small targets or high-density point clouds require particular attention to angular resolution and point cloud output specifications.
Advantages of Mechanical LiDAR
Mechanical LiDAR uses motors to drive rotating mirrors, prisms, or entire sensor assemblies. This changes the laser beam's direction and allows it to scan the surrounding environment. Its main advantages include:
Wide scanning field of view: The rotating mechanism changes the laser scanning direction and allows some mechanical LiDAR systems to cover a wide horizontal field of view. Certain models support 360° rotational scanning, making them suitable for applications that require extensive environmental coverage.
High angular resolution: Mechanical scanning systems can control the laser beam at specified angular intervals. By adjusting the scanning step and sampling method, they can achieve high angular resolution and point cloud density. This is useful for applications that require detailed measurements of target contours and spatial dimensions.
Mature technology: Mechanical LiDAR has been developed and used for many years. Its rotating scanning structures and associated control technologies are relatively mature, with established applications in terrain mapping, building measurement, and other 3D measurement tasks.
Disadvantages of Mechanical LiDAR
Mechanical LiDAR relies on moving components to perform scanning. This creates certain limitations in structural reliability, installation space, and maintenance.
Wear of mechanical components: Mechanical LiDAR typically contains motors, rotating mirrors, prisms, or other moving assemblies. Long-term operation can cause mechanical wear, and the equipment may be more susceptible to external vibration and shock. Regular inspection and maintenance may be necessary, depending on operating conditions.
Relatively large structural dimensions: Traditional rotating mechanical LiDAR requires installation space for rotating assemblies, drive mechanisms, and optical components. Some models have relatively large dimensions and weight, which can restrict equipment integration and installation options.
Scanning speed limited by mechanical movement: The laser scanning path depends on rotating or oscillating mechanisms. Scanning frequency and data update rates are therefore affected by the performance of these mechanisms. For applications involving fast-moving targets, the scanning frequency and system processing capacity must be evaluated together to determine tracking performance.
More maintenance work: Motors, bearings, and other moving components must remain in proper operating condition. After extended use, some components may require inspection, lubrication, or replacement, increasing equipment maintenance requirements.
How to Choose Between Solid-State and Mechanical LiDAR
Neither technology is universally superior. The appropriate choice depends on the application's operating requirements.
For autonomous vehicles, drones, and mobile robots with limited installation space and requirements for compact integration and long-term reliability, solid-state LiDAR is worth considering. Mechanical LiDAR remains suitable for terrain mapping, building measurement, and applications that require a wide scanning field of view or long detection distances.
During selection, compare the detection range, horizontal and vertical field of view, angular resolution, point cloud output frequency, and environmental resistance of specific products. LiDAR performance should not be judged solely by whether a system is classified as solid-state or mechanical. Final selection should be based on product specifications and actual test results.
Custom Machining of Precision Parts for LiDAR Equipment
The mechanical structures of LiDAR systems include mounting brackets, equipment housings, connecting components, and other structural parts. Different scanning architectures have different requirements for component dimensions, mounting interfaces, and machining accuracy. Hansheng Automation provides custom precision machining based on customer drawings and accepts both single-piece and small-batch orders.
Our machining services also cover precision components for yachts and RC racing cars, as well as parts for tobacco packaging machinery and filling equipment. Components are manufactured according to the drawings and assembly requirements of each project.
