Design and algorithm research of high-precision laser speed measurement system

In order to meet the challenges of extracting high precision Doppler frequencies and the low measurement accuracy in laser Doppler velocimetry systems, a high-precision laser speed measurement system based on a dual-beam dual-scattering optical path is designed. First, optical frequency shifting technology and a high-pass filter is employed in dual-beam dualscattering optical path to effectively enhance the signal-to-noise ratio. Next, an adaptive sampling algorithm is introduced to further reduce system errors and improve accuracy at low speeds. Subsequently, energy centrobaric correction method is applied for spectral calibration, resulting in accurate Doppler frequency measurement. Experimental results indicate that the system's relative measurement error is less than 0.3%, fully meeting the requirements for speed measurement in modern industries such as cable manufacturing.