Implementation of a digital Lock-in amplifier in SoC-FPGA for Biomedical Tomography

Magnetic Tomography is a technique that uses coil arrangements to determine the conductivity and permeability profile of an object. This is achieved by applying sinusoidal stimuli to a driving coil and measuring the generated signal in a sensing coil. These signals are usually of very low amplitude...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Oliva, Matías Javier, García, Pablo Andrés, Spinelli, Enrique Mario, Veiga, Alejandro Luis
Formato: Objeto de conferencia
Lenguaje:Inglés
Publicado: 2022
Materias:
Ingeniería
Amplificador Lock-in
Diseño Digital
Tomografía Magnética
Instrumentación biomédica
Lock-in amplifier
SoC-FPGA
Magnetic Tomography
Digital design
Biomedical instrumentation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/160855
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-160855
record_format dspace
spelling I19-R120-10915-1608552023-11-30T04:07:16Z http://sedici.unlp.edu.ar/handle/10915/160855 Implementation of a digital Lock-in amplifier in SoC-FPGA for Biomedical Tomography Oliva, Matías Javier García, Pablo Andrés Spinelli, Enrique Mario Veiga, Alejandro Luis 2022-09 2022 2023-11-29T14:00:46Z en Ingeniería Amplificador Lock-in Diseño Digital Tomografía Magnética Instrumentación biomédica Lock-in amplifier SoC-FPGA Magnetic Tomography Digital design Biomedical instrumentation Magnetic Tomography is a technique that uses coil arrangements to determine the conductivity and permeability profile of an object. This is achieved by applying sinusoidal stimuli to a driving coil and measuring the generated signal in a sensing coil. These signals are usually of very low amplitude and poor levels of signal to noise ratio, but the applied stimulus is known, which enables the use of techniques such as the Lock-in amplifier to recover the response. However, the high price of commercially available devices is restrictive, so it is of interest to generate an open design. Heterogeneous embedded systems, which combine an array of programmable logic cells, a processor, peripherals, and shared memory controllers are an interesting tool to implement such a system. In this work the theoretical aspects of the Lock-in amplifier are discussed, showing that its action reduces the noise of the signals in a factor proportional to the bandwidth of the low-pass filter. Then, the design of an open-source Lock-in amplifier with a moving average filter on a DE1-SoC platform is presented, and it is experimentally shown that it reduces the noise of the signals by a factor √(N/2), where N is the number of samples involved in the calculation of the moving average. La Tomografía Magnética es una técnica que utiliza arreglos de espiras para determinar el perfil de conductividad y permeabilidad de un objeto bajo estudio. Esto se logra aplicando estímulos sinusoidales en una espira excitadora y midiendo la señal generada en una espira sensora. Estas señales suelen ser de muy baja amplitud y pobres niveles de relación señal a ruido, pero, al tener control sobre el estímulo aplicado, se pueden utilizar técnicas como el amplificador Lock-in para recuperar la respuesta. Sin embargo, el elevado precio de los aparatos disponibles resulta restrictivo, por lo que es de interés generar un diseño abierto. Los sistemas embebidos heterogeneos, que combinan un arreglo de celdas lógicas programables, un procesador, periféricos y controladores de memoria compartida, son una herramienta interesante para implementar un sistema como este. En este trabajo se describen los aspectos teóricos del funcionamiento del Lock-in, mostrando que reduce el ruido de las señales en un factor proporcional al ancho de banda del filtro pasa-bajos utilizado. Luego se presenta el diseño de un amplificador Lock-in de código abierto, con un filtro de media móvil en una plataforma DE1-SoC, y se muestra experimentalmente que el ruido de las señales se reduce en un factor √(N/2), donde N es la cantidad de muestras involucradas en el cálculo del promedio móvil. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales Objeto de conferencia Objeto de conferencia http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería
Amplificador Lock-in
Diseño Digital
Tomografía Magnética
Instrumentación biomédica
Lock-in amplifier
SoC-FPGA
Magnetic Tomography
Digital design
Biomedical instrumentation
spellingShingle Ingeniería
Amplificador Lock-in
Diseño Digital
Tomografía Magnética
Instrumentación biomédica
Lock-in amplifier
SoC-FPGA
Magnetic Tomography
Digital design
Biomedical instrumentation
Oliva, Matías Javier
García, Pablo Andrés
Spinelli, Enrique Mario
Veiga, Alejandro Luis
Implementation of a digital Lock-in amplifier in SoC-FPGA for Biomedical Tomography
topic_facet Ingeniería
Amplificador Lock-in
Diseño Digital
Tomografía Magnética
Instrumentación biomédica
Lock-in amplifier
SoC-FPGA
Magnetic Tomography
Digital design
Biomedical instrumentation
description Magnetic Tomography is a technique that uses coil arrangements to determine the conductivity and permeability profile of an object. This is achieved by applying sinusoidal stimuli to a driving coil and measuring the generated signal in a sensing coil. These signals are usually of very low amplitude and poor levels of signal to noise ratio, but the applied stimulus is known, which enables the use of techniques such as the Lock-in amplifier to recover the response. However, the high price of commercially available devices is restrictive, so it is of interest to generate an open design. Heterogeneous embedded systems, which combine an array of programmable logic cells, a processor, peripherals, and shared memory controllers are an interesting tool to implement such a system. In this work the theoretical aspects of the Lock-in amplifier are discussed, showing that its action reduces the noise of the signals in a factor proportional to the bandwidth of the low-pass filter. Then, the design of an open-source Lock-in amplifier with a moving average filter on a DE1-SoC platform is presented, and it is experimentally shown that it reduces the noise of the signals by a factor √(N/2), where N is the number of samples involved in the calculation of the moving average.
format Objeto de conferencia
Objeto de conferencia
author Oliva, Matías Javier
García, Pablo Andrés
Spinelli, Enrique Mario
Veiga, Alejandro Luis
author_facet Oliva, Matías Javier
García, Pablo Andrés
Spinelli, Enrique Mario
Veiga, Alejandro Luis
author_sort Oliva, Matías Javier
title Implementation of a digital Lock-in amplifier in SoC-FPGA for Biomedical Tomography
title_short Implementation of a digital Lock-in amplifier in SoC-FPGA for Biomedical Tomography
title_full Implementation of a digital Lock-in amplifier in SoC-FPGA for Biomedical Tomography
title_fullStr Implementation of a digital Lock-in amplifier in SoC-FPGA for Biomedical Tomography
title_full_unstemmed Implementation of a digital Lock-in amplifier in SoC-FPGA for Biomedical Tomography
title_sort implementation of a digital lock-in amplifier in soc-fpga for biomedical tomography
publishDate 2022
url http://sedici.unlp.edu.ar/handle/10915/160855
work_keys_str_mv AT olivamatiasjavier implementationofadigitallockinamplifierinsocfpgaforbiomedicaltomography
AT garciapabloandres implementationofadigitallockinamplifierinsocfpgaforbiomedicaltomography
AT spinellienriquemario implementationofadigitallockinamplifierinsocfpgaforbiomedicaltomography
AT veigaalejandroluis implementationofadigitallockinamplifierinsocfpgaforbiomedicaltomography
_version_ 1807221984051855360

Ejemplares similares