Optical Engineering for Automotive LiDAR
A LiDAR optical system must launch a controlled beam, scan or distribute it over the required field, collect a weak return, reject unwanted light, and maintain calibration through temperature, vibration, contamination, and production variation. Range is an outcome of the complete link budget, not one optical component.
Define the operating scenario
Architecture depends on field of view, angular resolution, frame behavior, minimum and maximum range, target reflectivity, sunlight conditions, eye-safety constraints, packaging envelope, power, and vehicle integration. These inputs should be connected through transmit, receive, detector, timing, and processing budgets.
Transmit path
The transmit design controls divergence, beam quality, aperture use, scan geometry, and irradiance distribution. Important interfaces include the source, collimator, scanner, protective window, coatings, and mechanical datum structure. Wavelength drift, source placement, and scan-angle dependence may change both pointing and beam shape.
Receive path
The receiver balances entrance aperture, field of view, detector size, optical throughput, aberration, background-light rejection, and packaging depth. Narrowband filters can improve solar rejection but introduce angle and temperature sensitivity. The window and housing may create ghosts or scatter that appear as false or elevated returns.
Calibration and environmental stability
Transmit-to-receive boresight, channel registration, scan linearity, detector mapping, and window effects should have explicit calibration provisions. Optical tolerances must be combined with structural and thermal analysis so the calibration strategy is realistic over the operating range.
Verification
Bench and system tests can cover beam divergence, pointing, receiver field, throughput, filter behavior, ghost paths, stray light, calibration repeatability, thermal drift, and vibration retention. Automotive qualification requires a broader validated plan; optical verification should produce traceable evidence that feeds that process rather than standing apart from it.
PAO provides custom lens design for LiDAR and custom optical design services for autonomous and sensing platforms.