Patent ID: 11525919

Abstract:
A vehicle-mounted dual-oblique asymmetric laser velocity measurement device is provided. A small-angle splitting prism (9) is installed on a laser path where the laser beam of the reference-beam LDV probe is incident onto a driving surface. The laser beam is split by the small-angle splitting prism (9) into two emergent beams having an included angle α for incidence onto the driving surface. Two ground-scattered light beams returning along the original direction of the two emergent beams are used as signal light together. Reference light is mixed with the signal light on a photosensitive surface of a photodetector of the reference beam LDV probe. The photodetector mixes the reference light and the signal light to form Doppler signals for transmission to a signal processing unit (10). The signal processing unit (10) extracts the Doppler frequencies corresponding to the two emergent beams separately, to implement velocity calculation.