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A low-cost, high-performance, digital signal processor-based lock-in amplifier capable of measuring multiple frequency sweeps simultaneously

Journal Article:

Abstract

A high-performance digital lock-in amplifier implemented in a low-cost digital signal processor (DSP) board is described. This lock in is capable of measuring simultaneously multiple frequencies that change in time as frequency sweeps (chirps). The used 32-bit DSP has enough computing power to generate N=3 simultaneous reference signals and accurately measure the N=3 responses, operating as three lock ins connected in parallel to a linear system. The lock in stores the measured values in memory until they are downloaded to the a personal computer (PC). The lock in works in stand-alone mode and can be programmed and configured through the PC serial port. Downsampling and multiple filter stages were used in order to obtain a sharp roll off and a long time constant in the filters. This makes measurements possible in presence of high-noise levels. Before each measurement, the lock in performs an autocalibration that measures the frequency response of analog output and input circuitry in order to compensate for the departure from ideal operation. Improvements from previous lock-in implementations allow measuring the frequency response of a system in a short time. Furthermore, the proposed implementation can measure how the frequency response changes with time, a characteristic that is very  More>>
Authors:
Sonnaillon, Maximiliano Osvaldo; Bonetto, Fabian Jose [1] 
  1. Laboratorio de Cavitacion y Biotecnologia, San Carlos de Bariloche (8400) (Argentina)
Publication Date:
Feb 01, 2005
Product Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 76; Journal Issue: 2; Other Information: DOI: 10.1063/1.1854196; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CALIBRATION; DIGITAL FILTERS; FREQUENCY MEASUREMENT; LOCK-IN AMPLIFIERS; NOISE; PERFORMANCE; PERSONAL COMPUTERS; SAMPLING; SIGNALS
OSTI ID:
20644101
Country of Origin:
United States
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0034-6748; RSINAK; TRN: US05A7071085111
Submitting Site:
INIS
Size:
page(s) 024703-024703.7
Announcement Date:
Nov 17, 2005

Journal Article:

Citation Formats

Sonnaillon, Maximiliano Osvaldo, and Bonetto, Fabian Jose. A low-cost, high-performance, digital signal processor-based lock-in amplifier capable of measuring multiple frequency sweeps simultaneously. United States: N. p., 2005. Web. doi:10.1063/1.1854196.
Sonnaillon, Maximiliano Osvaldo, & Bonetto, Fabian Jose. A low-cost, high-performance, digital signal processor-based lock-in amplifier capable of measuring multiple frequency sweeps simultaneously. United States. doi:10.1063/1.1854196.
Sonnaillon, Maximiliano Osvaldo, and Bonetto, Fabian Jose. 2005. "A low-cost, high-performance, digital signal processor-based lock-in amplifier capable of measuring multiple frequency sweeps simultaneously." United States. doi:10.1063/1.1854196. https://www.osti.gov/servlets/purl/10.1063/1.1854196.
@misc{etde_20644101,
title = {A low-cost, high-performance, digital signal processor-based lock-in amplifier capable of measuring multiple frequency sweeps simultaneously}
author = {Sonnaillon, Maximiliano Osvaldo, and Bonetto, Fabian Jose}
abstractNote = {A high-performance digital lock-in amplifier implemented in a low-cost digital signal processor (DSP) board is described. This lock in is capable of measuring simultaneously multiple frequencies that change in time as frequency sweeps (chirps). The used 32-bit DSP has enough computing power to generate N=3 simultaneous reference signals and accurately measure the N=3 responses, operating as three lock ins connected in parallel to a linear system. The lock in stores the measured values in memory until they are downloaded to the a personal computer (PC). The lock in works in stand-alone mode and can be programmed and configured through the PC serial port. Downsampling and multiple filter stages were used in order to obtain a sharp roll off and a long time constant in the filters. This makes measurements possible in presence of high-noise levels. Before each measurement, the lock in performs an autocalibration that measures the frequency response of analog output and input circuitry in order to compensate for the departure from ideal operation. Improvements from previous lock-in implementations allow measuring the frequency response of a system in a short time. Furthermore, the proposed implementation can measure how the frequency response changes with time, a characteristic that is very important in our biotechnological application. The number of simultaneous components that the lock in can generate and measure can be extended, without reprogramming, by only using other DSPs of the same family that are code compatible and work at higher clock frequencies.}
doi = {10.1063/1.1854196}
journal = {Review of Scientific Instruments}
issue = {2}
volume = {76}
place = {United States}
year = {2005}
month = {Feb}
}