基于光-微波映射的大量程频域干涉测距技术研究OA

This paper presents a large-range frequency-domain interferometric ranging method based on light-microwave mapping.Theoretical analysis shows that the frequency-domain interferometric signal can be periodically mapped from the optical frequency-domain to the microwave frequency-domain through photoelectric conversion,enabling high-resolution acquisition in the microwave frequency-domain.This overcomes the limitations caused by the relatively low spectral measurement resolution and provides the possibility to expand the measurement range of optical frequency-domain interferometry.A principle verification experiment is carried out,and absolute distance measurement with an accuracy of 11.1 μm is achieved within a range of 5 m.Compared with the existing optical frequency-domain interferometric ranging technology,this method expands the measurement range by about 30 times while maintaining a ranging accuracy of around 10 μm.In addition,a fast and high-fidelity sampling method for wide-spectrum frequency-domain interferometric signals is also studied.And it shows that within a range of 5 m,as the sampling time gradually increases to 10 μs,the ranging standard deviation ultimately remains within 200 μm.Finally,the kilometer-level ranging capability of this technology is experimentally investigated,and it shows that millimeter-level ranging accuracy can be achieved within the microsecond scale,providing a new solution for optical frequency-domain,interferometric,fast absolute distance measurement with high-precision and large-range.