Abstract: LiDAR serves as the core sensing component of autonomous driving systems, and its reliability is a prerequisite for mass-market deployment. Since LiDAR integrates high-precision optical modules and high-power consumption chips, conventional environmental test equipment often falls short of meeting its complex testing requirements. This article provides a comprehensive technical selection guide for rapid temperature change test chambers, focusing on temperature transition rates, control precision, and system safety.
1. Core Thermal Performance: Meeting Automotive-Grade Stress Demands
LiDAR reliability testing (such as ESS – Environmental Stress Screening) requires extreme temperature transitions within short durations to trigger latent process defects.
Temperature Range: -70°C to +150°C
The selection must cover Automotive Grade 1 requirements (-40°C to +125°C) and provide sufficient low-temperature redundancy to ensure stable cooling output during extreme cold simulations.
Transition Rate: 10°C/min or 15°C/min (Linear Control)
It is highly recommended to prioritize Linear temperature control. This ensures a constant stress application throughout the heating and cooling process, avoiding the rate decay at temperature extremes common in non-linear control, which can lead to incomplete testing.
Heat Load Compensation: 500W
LiDAR generates significant self-heat during active testing. The selected chamber must demonstrate sufficient cooling capacity to offset a heat load of 500W or more, even at the $-40°C low-temperature soak point.
2. Mechanical Construction and Optical Environment Protection
The optical nature of LiDAR requires a testing environment with high cleanliness and structural stability.
Internal Volume: $225L$ or 500L Recommended
Volume selection should follow the “1/3 Rule”—the total volume of the test specimens should not exceed one-third of the chamber’s effective internal volume to ensure proper airflow and avoid “heat island” effects.
Interior Material: SUS304/SUS316L Mirror-Finish Stainless Steel
A high-grade stainless steel interior is mandatory to prevent flaking or dust generation during frequent high-low temperature cycling, which could contaminate the LiDAR’s optical window.
Cable Port Configuration: Dual $\phi 100mm Ports
LiDAR testing involves power cables, high-speed Ethernet, and multiple signal lines. It is advised to have one port on each side of the chamber, equipped with high-sealing silicone plugs to minimize thermal loss.
3. Control System: KM-5166 Intelligent Technical Standards
The control system is the “brain” of the chamber, determining both data authenticity and the safety of the specimen.
KBT (Balanced Temperature) Precision Control
Specify a system with Fuzzy + PID automatic calculation capabilities, such as the KOMEG proprietary KM-5166. Its core advantage lies in suppressing Temperature Overshoot, preventing instantaneous thermal overload from damaging expensive laser diodes.
Data Traceability and Security
Storage Capacity: The internal memory should store over 3 months of historical curves with one-click USB export for reliability tracing.
Communication Interfaces: Standard Ethernet (LAN) and RS-485 ports are required for remote monitoring via PC software, enabling synchronized data collection of both environmental parameters and LiDAR output.
Power-Failure Recovery: A mandatory “Resume” function ensures that cycles lasting hundreds of hours are not invalidated by unexpected power interruptions.
4. Safety Protection and Specialized Configuration
For high-value precision specimens, the chamber must feature multiple active defense mechanisms:
Independent Specimen Over-temperature Protection: The chamber must be able to physically cut off power to the LiDAR specimen if internal temperatures exceed a safety threshold to prevent hardware combustion.
Anti-Condensation System: During rapid heating phases, it is recommended to integrate a Dry Air or Nitrogen Purge system to prevent condensation on the LiDAR internal circuitry or lens surfaces, which could cause optical failure.
Multi-level Safety Alarms: Includes over 80 diagnostic logics (e.g., compressor over-pressure, fan overload, sensor failure) to support safe, unattended 24/7 testing.
5. Validation and Delivery Recommendations
During the final acceptance phase, verify the following:
Verifiability: Request a 3rd-party calibration certificate for temperature uniformity (compliant with GB/T 5170 or equivalent international standards).
Performance Testing: Explicitly state the “Temperature Transition Rate under Full Load” in the contract and require on-site curve verification before final sign-off.
When selecting a rapid temperature change test chamber for LiDAR, priority should be given to equipment featuring KBT precision control and high-linearity transition rates. The KOMEG KST series, powered by the stable KM control solution, provides a reliability validation environment that meets the most stringent international automotive standards.
Technical Support:
To obtain the full Technical Specification for LiDAR Testing or the KM-5166 Controller Manual, please contact KOMEG Technical Support.