Photoelectric heterodyne detection circuit

Abstract

This invention relates to one electricity photo outer difference detection circuit to realize underwater sound communication, which comprises first detector, second one, first high pass filter, second filter, local oscillator, first mixture device, second device, third one, fourth one, ninety displacement device, first low pass filter, second one, third one, fourth one, data collection card, wave display device to form signal process circuit and reference process circuit.

Description

technical field [0001] The invention relates to photoelectric signals, in particular to a photoelectric heterodyne detection circuit for acousto-optic communication with an underwater target, which is a circuit for realizing photoelectric heterodyne detection by only using electronic devices. Background technique [0002] With the rapid development of laser Doppler vibration measurement technology, it has the precision and sensitivity that cannot be achieved by ordinary methods, and can measure the movement speed and small changes of various weak vibration targets in a long-distance and non-contact manner. The high precision, strong anti-interference ability, and good confidentiality of laser Doppler vibration measurement technology make it used in communication with underwater targets, and it is a powerful technical means to obtain underwater target information. [0003] The development of laser Doppler vibration measurement technology depends not only on the long-term deve...

AI Technical Summary

Problems solved by technology

When the mirror or other devices in the measurement device move to the boundary conditions they may reach, the frequency shift cannot be maintained infinitely, which will cause a short-term loss of the beam or a phase jump. At the same time, it can be seen from Figure 1: The device uses APD, multiple beam splitters and other optical components to achieve frequency shift and phase detection, which increases the difficulty of adjusting the optical path and the volume of the system

And because the AOM preset frequency shift of the measurement device is -80MHz, it increases the difficulty of subsequent data processing

Therefore, the existing heterodyne detection device is not only complicated to operate, but also expensive

At the same time, the AOM drive is an independent component, which undoubtedly increases the volume of the system

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