Novel signal acquisition circuit

Abstract

The invention discloses a novel signal acquisition circuit. The circuit comprises a conductivity excitation source circuit and a conductivity voltage acquisition circuit, wherein the conductivity excitation source circuit is electrically connected with the conductivity voltage acquisition circuit, and is used for supplying power to a conductivity electrode. The circuit can quickly and stably read a signal and store the signal into an SD card, has the advantages of low power consumption, strong anti-interference performance, high precision and the like; the conductivity voltage acquisition circuit adopts positive and negative square wave excitation, so that the influence of electrode polarization can be reduced, and the stability can be improved;and an effective value conversion circuit is used for converting an alternating current voltage signal into a direct current voltage value and sending the direct current voltage value to an ADC for reading the value; a bridge circuit is adopted for temperature acquisition to generate differential signals, and the differential signals can be read by the ADC, so that interference can be effectively reduced, precision can be effectively improved; and a constant current source excitation circuit is adopted for pressure acquisition, so that the compensation effect of thermal sensitivity drifting is facilitated, interference caused by temperature to a pressure sensor can be reduced, and precision can be improved.

Description

technical field [0001] The invention relates to the field of signal acquisition, in particular to a novel circuit for signal acquisition. Background technique [0002] As our country attaches great importance to the ocean field, the demand for marine instruments in our country is increasing day by day. CTD, as a basic instrument for ocean observation, has a wide market demand. However, the market of temperature, salt and depth observers in my country is controlled by foreign brands. Due to technical limitations, the products produced by domestic domestic enterprises cannot achieve the required high precision, and the accuracy is generally around ±0.1%. Therefore, the self-made high-precision CTD is the problem that our country needs to solve, so it is necessary to design a high-precision signal acquisition circuit to solve the above problems. Contents of the invention [0003] The purpose of the present invention is to provide a new signal acquisition circuit to solve the e...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of signal acquisition circuit to solve existing technical defects and technical requirements that cannot be met

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