Continuous laser frequency modulation range measurement device and method based on resampled signal splicing method

Abstract

The invention discloses a continuous laser frequency modulation range measurement device based on a resampled signal splicing method. The device comprises a tunable laser, a laser controller, a self-adaptive measurement interference system, an auxiliary interference system, a synchronous data collection system, a data processing system and a temperature control system. The tunable laser provides linear frequency modulation laser light, the auxiliary interference system generates clock signals used for resampling, the self-adaptive measurement interference system adjusts the length of reference optical fibers according to the actual distance of a measured object, the synchronous data collection system synchronously samples two paths of beat frequency signals generated by the self-adaptive measurement interference system and the auxiliary interference system, the data processing system conducts resampling and signal splicing, and a distance measurement result is obtained through calculation. Due to the fact that the measurement resolution ratio is limited by laser modulation linearity and the modulation range, the data processing method can be used for compensating for the laser modulation linearity, broadening the equivalent modulation range and improving the distance measurement resolution ratio. The continuous laser frequency modulation range measurement device is suitable for the field of high-precision laser distance measurement.

Description

technical field [0001] The invention relates to a high-resolution continuous laser frequency modulation ranging device and method based on a resampling signal splicing method. Background technique [0002] Since the birth of the laser, it has significant application advantages in ranging performance by virtue of its remarkable characteristics of good directionality, high brightness, good monochromaticity, strong coherence, and frequency in the light wave band. In recent years, laser ranging technology has developed rapidly and is widely used in scientific research, metrology, industrial measurement, aerospace and surveying and mapping. Especially in the field of aircraft, aerospace, ships, large-scale equipment manufacturing, etc. that require large-scale measurement (tens of meters to tens of meters), due to its large measurement range and high requirements for linear calibration and assembly, the relative accuracy is generally required to reach 1— 10ppm, in order to obtai...

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Problems solved by technology

[0004] In the existing continuous laser frequency modulation ranging technology, the ranging resolution δ is r

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