Implementation of Digital Lock-in Amplifier

Bhattacharyya, Sabyasachi; Ahmed, Ragib Nasir; Purkayastha, Basab Bijoy; Bhattacharyya, Kaustubh

doi:10.1088/1742-6596/759/1/012096

Cited by 19 publications

(14 citation statements)

References 7 publications

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“…LIA can generate a pure sinusoidal waveform without an external VCO (voltage controlled oscillator) and a PLL and provide perfect synchronization between the generated signal and the acquired one. LIA is capable of calculating the in-phase and in-quadrature components only at the reference frequency from the resulting response signal by injecting the generated reference signal [20,21].…”

Section: Implementing Lock-in Amplifiermentioning

confidence: 99%

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A Multi-Channel Fast Impedance Spectroscopy Instrument Developed for Quality Assurance of Super-Capacitors

et al. 2021

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Conventional experimental methods for testing the performance of super-capacitors include the measurement of capacitance through charge and discharge, measurement of equivalent series resistance (ESR) and measurement of self-discharge and the equivalent circuit model (ECM) by electrochemical impedance spectroscopy (EIS). However, the methods are not suitable for the mass production line of supercapacitors since they require a long time for the test and several kinds of different instrument. EIS is an attractive method to evaluate the performance of supercapacitors except that it takes a long time for a single test. In this paper a fast EIS instrument suitable for quality assurance for the mass production of supercapacitors is proposed. In order to reduce the time for the test, a multi-sine sweeping method is used for the EIS test and the results are analyzed by extracting the parameters of the ECM to evaluate the performance of the supercapacitors. The proposed instrument is developed to have multi-channel to further decrease the time for the test with a supercapacitor. It is also presented as to how the extracted parameter values of the ECM can be used to evaluate the performance of the supercapacitor.

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Section: Implementing Lock-in Amplifiermentioning

confidence: 99%

“…where θ is the parameter present in the selected electrical equivalent circuit model. These parameters can be estimated by minimizing the function in Equation (20).…”

Section: Complex Non-linear Least Square Curve Fittingmentioning

confidence: 99%

A Multi-Channel Fast Impedance Spectroscopy Instrument Developed for Quality Assurance of Super-Capacitors

et al. 2021

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“…The lock-in amplifier was designed to extract a specific frequency signal from a large interference environment. The core of the module is a phase sensitive detector [20]. The structure of the DLIA is shown in Figure 6.…”

Section: Digital Lock-in Amplifiermentioning

confidence: 99%

A Near-Infrared Trace CO2 Detection System Based on an 1,580 nm Tunable Diode Laser Using a Cascaded Integrator Comb (CIC) Filter-Assisted Wavelength Modulation Technique and a Digital Lock-in Amplifier

Dong

2019

Front. Phys.

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A near-infrared trace CO 2 detection system was experimentally demonstrated based on an 1,580 nm distributed feedback (DFB) laser using a cascaded integrator comb (CIC) filter-assisted wavelength modulation spectroscopy (WMS) technique and a digital lock-in amplifier (DLIA). An 1,580 nm DFB laser emitting at 1,579.1 nm was selected as the light source. A multi-pass cell (MPGC with a 30 m-long path) was adopted as the absorption cell. A DLIA was developed to extract the second harmonic WMS (WMS-2f) signal. The cascade-integrated comb filter (CICF) and the finite impulse response (FIR) low-pass filter (LPF) were combined in the DLIA to improve the performance of DLIA. Three methods of PD (Peak detection), LIA, CICF-assisted WMS, and DLIA were adopted to detect the CO 2 concentration levels and the anti-interference performance of each detection method was analyzed. The experimental results indicated that compared with the peak detection and the lock-in amplifier method of the CICF-assisted WMS and DLIA developed in this manuscript had the highest linearity and precision. When the integration time is 3s, the LOD of the system was predicted to be 0.0812 ppm. Due to the advantages of high sensitivity, a low detection limit and a rapid response, the CO 2 detection system reported in this manuscript has a good application prospect in the area of oilfield associated gases detection.

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“…In the case of the modulation excitation mode, ambient light influence is reduced due to discrepancy between the modulation frequency and fluctuation frequency of ambient light. Usually, the modulation frequency is between 10 and 100 kHz [31,32]. In processing the measured signal, it is possible to isolate the modulation frequency and cut off the low-frequency components corresponding to the ambient light fluctuations.…”

Section: Introductionmentioning

confidence: 99%

“…The photoreceiver based on the modulation mode of excitation may be developed via various approaches, such as the use of a narrowband amplifier, lock-in amplifier, FFT filter, and their combination [31,32]. Each approach has its special features.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Excitation and Detection Modes to Detect Ultra-Small Amounts of Semiconductor Quantum Dots Based on Cadmium Selenide

Kuzishchin¹,

Мартынов²,

Osipov³

et al. 2018

Opt. Spectrosc.

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At present, fluorescent spectroscopy is a powerful tool that is used in many biology applications. In practice, fluorescent labels based on organic dyes and semiconductor quantum dots are used. It is noteworthy that the semiconductor quantum dots have distinct advantages over organic dyes. At the same time, the efficiency parameters and modes of detection and excitation have not been investigated sufficiently. The results of theoretical study on the optimization of the excitation and detections modes for detecting ultrasmall amounts of CdSe/ZnS core/shell semiconductor quantum dots are presented at this paper.

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Implementation of Digital Lock-in Amplifier

Cited by 19 publications

References 7 publications

A Multi-Channel Fast Impedance Spectroscopy Instrument Developed for Quality Assurance of Super-Capacitors

A Multi-Channel Fast Impedance Spectroscopy Instrument Developed for Quality Assurance of Super-Capacitors

A Near-Infrared Trace CO2 Detection System Based on an 1,580 nm Tunable Diode Laser Using a Cascaded Integrator Comb (CIC) Filter-Assisted Wavelength Modulation Technique and a Digital Lock-in Amplifier

Optimization of Excitation and Detection Modes to Detect Ultra-Small Amounts of Semiconductor Quantum Dots Based on Cadmium Selenide

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