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Weak signal acquisition and amplification circuit in XCP system

A weak signal, amplifying circuit technology, used in power amplifiers, improving amplifiers to reduce noise effects, etc., can solve problems such as signal amplitude attenuation, phase delay, frequency distortion, etc.

Inactive Publication Date: 2018-01-16
郭洪
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The probe falls rapidly in the seawater, and the wire used as the transmission channel is gradually unfolded. Due to the characteristics of seawater and the influence of the transmission environment, the signal received on the water will have serious amplitude attenuation, phase delay and frequency distortion.

Method used

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  • Weak signal acquisition and amplification circuit in XCP system
  • Weak signal acquisition and amplification circuit in XCP system
  • Weak signal acquisition and amplification circuit in XCP system

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Embodiment Construction

[0019] exist figure 1 In the process, the electrode signal and the compass signal are amplified by the pre-amplifier respectively, and then the electrode signal can be phase-locked and amplified by the correlation operation to filter out part of the noise, thereby obtaining an amplified electrode signal micro volt level. The electrode signal is then subjected to two low-pass filter cut-off frequencies and a post-amplification magnification to obtain a millivolt-level electrode signal. The compass signal is about a millivolt level after filtering and amplifying. For the convenience of transmission, voltage-to-frequency conversion and harmonic filtering are performed on the flow velocity and compass signals, and the resulting signals can be mixed and sent by the mixing linear driver. The pre-amplification circuit is the key to ensure the effective operation of the entire lock-in amplifier circuit, because it can reliably amplify the received signal and make it a signal that is ...

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Abstract

The invention discloses a weak signal acquisition and amplification circuit in an XCP system. The weak signal acquisition and amplification circuit in the XCP system comprises a preamplifier circuit,a phase-locked amplification circuit composed of AD630, a variable gain amplifier circuit composed of LMH6505, and a V / F conversion external circuit with LM331. According to the weak signal acquisition and amplification circuit in the XCP system, a small amplitude and low frequency voltage signal is converted to a frequency-modulated signal by a voltage frequency conversion circuit on the basisof amplifying the amplitude of the signal by means of the weak signal acquisition and amplification circuit based on the phase-locked amplification technology, so that measured electrode signals are convenient for transmission, and the extracted signals are really suitable for transmission in the sea water environment. The circuit can effectively collect and amplify the signal.

Description

Technical field [0001] The invention relates to a weak signal acquisition and amplification circuit in an XCP system. Background technique [0002] The theoretical basis of XCP technology is the electromagnetic induction theory proposed by Faraday in 1832. Flowing seawater will generate an instantaneous induced electromotive force due to cutting the geomagnetic field. The induced electromotive force generated by flowing seawater at a distance of length is equivalent to the electromotive force generated when a conductor with a length of cuts the geomagnetic field. When the probe equipped with electrodes rotates and falls rapidly, the flow velocity component of the vertical section of the ocean current can be measured. The probe is used to measure the temperature and flow velocity of seawater, in which the temperature signal is collected by thermistor measurement, and the flow velocity signal is collected by electrode signal and compass coil. According to the design requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F3/21
Inventor 郭洪
Owner 郭洪
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