Device and method for measuring data of femtosecond range laser radar based on microwave photonics

Abstract

The invention discloses a device and method for measuring real-time data of a femtosecond range laser radar based on microwave photonics. The method comprises the following steps of: converting a distance signal measured by the femtosecond range laser radar into a microwave pulse frequency signal; performing band-pass filtering on the microwave pulse frequency signal, and then amplifying; taking an amplified signal as a modulating signal and performing phase modulation on a carrier; and detecting a frequency of a first sideband signal of the carrier by an optical frequency identifier to obtain the frequency of the microwave pulse frequency signal. The device comprises a band-pass filter, a microwave amplifier, a single-frequency continuous light laser, an optical phase modulator, the frequency identifier, a detector, a photoelectric detector and an oscilloscope. According to the method and device provided by the invention, an optical border frequency identifying technology is combined, so that the problems of the traditional measuring method for the present real-time data of the femtosecond range laser radar that the response frequency is insufficient, the data storage requirement is high and the real-time closed-loop control is difficult to realize are solved.

Description

technical field [0001] The invention belongs to the technical field of femtosecond optical detection and microwave signal processing, in particular to a measurement device and method for real-time data of femtosecond ranging laser radar based on microwave photonics. Background technique [0002] The signal of the femtosecond ranging lidar based on real-time dispersion Fourier transform is an interference fringe in the time domain, which belongs to the microwave pulse. In existing solutions, high-speed photodetectors are usually used to collect time-domain interference signals, and then real-time sampling phosphorescence oscilloscopes are used to sample and record the electrical signals output by the photodetectors. However, usually the response frequency of real-time sampling phosphorescence oscilloscopes is lower than that of high-speed photodetectors, which will limit the dynamic range of signal measurement; moreover, in order to ensure the accuracy of detection, the sampl...

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Problems solved by technology

However, usually the response frequency of real-time sampling phosphorescence oscilloscopes is lower than that of high-speed photodetectors, which will limit the dynamic range of signal measurement; moreover, in order to ensure the accuracy of detection, the sampling frequency of real-time sampling phosphorescence oscilloscopes is generally very high (GHz order of magnitude )

For long-term, real-time detection tasks, the amount of data is huge, so this is a big challenge for high-speed data storage

[0003] Finally, due to the high repetition frequency of femtosecond laser pulses (MHz order) when monitoring high-speed vibrating targets in real time, the existing scheme uses the method of recording data first and then processing it later, which is very important for real-time monitoring and closed-loop control of high-speed Moving objects (such as magnetic levitation gyroscope) have lost their meaning

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