基于单片机的锁相放大器的水污染评价

2019 4th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT) Pub Date : 2019-08-01 DOI:10.1109/INSCIT.2019.8868489

Raiff Sales da Fonseca, M. Bonfim, R. Gonçalves, Rafael da Silva Ferraz, Eduardo Parente Ribeiro

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引用次数: 3

摘要

本文提出了一种锁相放大器(LIA)的经典设计和实现方法，用于数字间电容式传感器的阻抗测量，以评估水污染。它是基于一个通用微控制器和一个有源带通滤波器。该设计使用一个波发生器(AD9833)作为参考信号的源，并使用一个来自微控制器的模数转换器(ADC)对被测设备(DUT)信号进行采样。在本研究的特定背景下，通过对水氯和水盐溶液的电导、阻抗和电容测量来评估传感器的响应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Water pollution assessment by microcontroller-based lock-in amplifier

This paper presents a new approach to the classical design and implementation of a Lock-In Amplifier (LIA) applied to impedance measurement of interdigital capacitive sensors in order to evaluate water polution. It is based on a general-purpose microcontroller and an active band-pass filter. The design uses a wave generator (AD9833) as source for the reference signal and an Analog to Digital Converter (ADC) from the microcontroller to sample the device under test (DUT) signal. In the particular context of this study, the sensor responses are evaluated by conductance, impedance and capacitance measurements on water-chlorine and water-salt solutions.

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2019 4th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

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