Fast response lock-in amplifier

Banuelos-Saucedo, Miguel A.; Ozanyan, Krikor B.

doi:10.1109/isict.2012.6291623

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…This phenomenon is similar in the other two channels. According to (20)(21)(22), "lockout " will lead to increased errors in the final results. This phenomenon will also become more significant as the complexity of complex plane components superimposed by the image under test increases, as shown in the figure below:…”

Section: Limitationmentioning

confidence: 99%

“…Frequency shift is realized by multiplying the measured low SNR signal of known frequency with the reference signal of the same frequency [20] [21]. Low-pass filters is then used to filter out the noise and high-frequency components to obtain the DC portion that has a fixed mathematical relationship to the amplitude of the detected low SNR signal [22]. The main contribution in this work is the proposal of a twodimensional lock-in amplifier (2-D LIA) algorithm for image processing.…”

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Lock-in Amplifier Algorithm in Spatial Domain

Zhang

2023

Preprint

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An algorithm based on a two-dimensional lock-in amplifier method has been proposed for extracting complex plane components in images. Traditional one-dimensional time-frequency lock-in amplifier estimates the amplitude and phase of a periodic signal at a frequency determined by a reference signal that may be submerged by noise. In the field of digital image processing, it is necessary to analyze the information in the spatial domain. In this paper, a mathematical model has been established to describe the complex plane component in the image, and a two-dimensional lock-in amplifier algorithm has been developed. Compared with traditional lock-in amplifier algorithms, the proposed algorithm can be used to process signals with higher dimensions. Simulation and experimental results show that the proposed algorithm can effectively extract the complex plane components polluted by noise at given frequencies. This two-dimensional lock-in amplifier algorithm can be applied to the extraction and reconstruction of fringe patterns in images submerged by noise. The limitation of the proposed algorithm has been discussed.

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Section: Limitationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Lock-in Amplifier Algorithm in Spatial Domain

Zhang

2023

Preprint

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show abstract

“…This means that it can completely block the 2ω r component. For this filter, the bandwidth is inversely proportional to the number of samples being averaged, so if it is used in the lock-in technique, the measurement noise can be effectively reduced by averaging a larger number of periods of the signal [10] [11].…”

Section: Introductionmentioning

confidence: 99%