A multi-axis all-fiber dual-comb large-scale absolute ranging system

Abstract

The invention provides a multi-axis all-fiber double-comb large-scale absolute ranging system, which relates to the field of large-scale precision measurement. The multi-axis all-fiber dual-comb large-scale absolute ranging system includes an optical comb light source module, which is used to provide detection pulses and local oscillator pulses; an asynchronous sampling optical circuit module, which is used to obtain measurement signals and reference The signal is used to asynchronously sample the measurement pulse and reference pulse in the detection pulse through the local oscillator pulse; the signal acquisition module is used to convert the acquired optical signal into an electrical signal after filtering and other post-processing; the multi-axis optical circuit module, multi-axis The axis optical path module is used to make the ranging optical path multi-axis, and use the optical switch to detect separately. It can expand its application scenarios by adding measurement paths. The multi-axis all-fiber dual-comb large-size absolute ranging system provided by the invention can improve practicability and flexibility, can effectively avoid aliasing blind areas, and can reduce measurement costs.

Description

technical field [0001] The invention relates to the field of large-scale precision measurement, in particular to a large-scale absolute ranging system with a multi-axis all-fiber dual-comb. Background technique [0002] As one of the seven basic physical quantities, the length measurement is of great significance in the application of cutting-edge basic science and advanced technology. Especially in high-end equipment manufacturing and aerospace engineering, accurate large-scale measurement is very important. With the advent of femtosecond optical frequency combs, it has been gradually applied to absolute distance measurement. Since the optical frequency domain and the radio frequency domain can be linked, it is possible to trace the on-site value of large-scale ranging by locking to frequency standards such as atomic clocks. Femtosecond optical frequency combs are wide-spectrum light sources composed of a series of equally spaced, highly coherent optical longitudinal modes...

AI Technical Summary

Problems solved by technology

[0004] However, when the reference pulse and measurement pulse of the detection comb are coherent with the local oscillator comb at the same time, the traditional spatial dual-comb ranging system based on single-detector detection will periodically have a measurement aliasing dead zone, namely The measurement signal and the reference signal happen to overlap in the time domain and thus affect the measurement results

Moreover, the structure of the asynchronous sampling optical path for space detection is complex and not easy to integrate, which will severely limit the flexibility of the measurement device in industrial scenarios that require a compact design

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