Detection of a weak Near-Infrared signal using a digital orthogonal-vector lock-in amplifier

Tang, Qiu; Wang, J.; Zhang, Y.; Dong, Shihui; Jiang, Feng; Wang, Z.; Chen, Y.; Tang, Yuchao; Chen, J.; Zhang, H.

doi:10.1088/1748-0221/14/05/p05011

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…This study introduces a frequency extraction method using a lock-in amplifier (LIA) analysis for polarization-modulated ranging. Lock-in amplifiers (LIAs) are widely employed in various scientific domains, including metrology [26], biomedicine [27], seismic monitoring [28], detection [29,30] and others [31][32][33][34], due to their exceptional noise reduction capabilities. In our research, we apply frequency modulation to the modulator's drive signal, thereby modulating the detection signal into an AC signal to mitigate the impact of wideband noise, particularly detector 1/f noise.…”

Section: Increased Algorithm Complexitymentioning

confidence: 99%

Frequency Acquisition Approach in Polarization-Modulated Ranging Based on Lock-in Analysis

Gao,

Wang,

Chen

et al. 2023

Photonics

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In this study, we propose a frequency measurement and estimation approach based on a lock-in analysis for precise frequency determination in polarization-modulated ranging signals. In this method, the modulation signal of an electro-optic modulator (EOM) is manipulated to introduce an intermediate frequency (IF) component into the detected signal. Subsequently, the detected signal is analyzed using lock-in analysis techniques to extract the necessary frequency component, and a new swept frequency waveform is generated, facilitating the frequency acquisition and distance calculation. We conducted theoretical derivations, simulations and experiments to validate the effectiveness of this method. The research findings suggest that our method can enhance the accuracy of frequency measurements by a factor of approximately ten when compared to a direct detection approach, leading to a corresponding improvement in ranging precision. Furthermore, even with larger sweep step sizes and smaller modulation frequencies, the proposed approach can achieve superior ranging results.

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Section: Increased Algorithm Complexitymentioning

confidence: 99%

Frequency Acquisition Approach in Polarization-Modulated Ranging Based on Lock-in Analysis

Gao,

Wang,

Chen

et al. 2023

Photonics

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“…It includes a STM32f103zet6 microprocessor unit (MCU), a dual-channel ADC, two preamplifiers and a zero-comparison shaping circuit. The digital demodulation algorithm is widely used in near infrared spectrometer [23]. The digital demodulation algorithm [24] is adopted to obtain the value of the light intensity.…”

Section: Jinst 16 P10019mentioning

confidence: 99%

A measurement method in near infrared spectroscopy for reference correction with the homologous optical beams

et al. 2021

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In order to improve the stability of the portable near infrared (NIR) spectrometer, a measurement method in NIR spectroscopy (e.g. reference correction with the homologous optical beam) was proposed. Based on the measurement method, the contrast sampling mechanism was designed to obtain the reference beam from light source to ensure that the reference beam and the light source drift in the same trend. The reference beam can be used to eliminate the drift of the measured spectral data due to the drift of the light source. Then, by using the contrast sampling mechanism, the NIR spectrometer for reference correction with the homologous optical beams was developed. Using the newly designed spectrometer, the experiment to compare the performance of the single optical path detection method and dual optical path detection method was conducted. According to experimental results, the stability of the newly designed spectrometer achieved substantial improvement. The baseline drift of the reflectance spectra of gilding aluminium plate was decreased from 0.37% (with single optical path detection) to 0.074%, while the baseline drift of the reflectance spectra of kaolin was decreased from 2.92% to 0.16%.

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“…ACEs have many variable geometries, such as the fan-on-blade (Flade) and the mode selector valve (MSV). Many configurations of ACEs have been developed according to the combination of variable geometries [2][3][4][5][6]. An engine has one or two more bypasses than the traditional turbofan engine, and the variable geometries can adjust the bypass mass flows.…”

Section: Introductionmentioning

confidence: 99%

Thermal cycle performance optimization and advantage analysis of an adaptive cycle engine in various bypass modes

Zhen,

Dong,

Zhou

et al. 2024

Preprint

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With the proposal of carbon neutrality goals, the necessity of reducing carbon in the aviation industry has become increasingly prominent. The advanced aero propulsion technology of adaptive cycle engines poses a new challenge to the traditional engine, which has received widespread attention and high expectations from people. Adaptive cycle engines can change the engine's thermal cycle through adjusting variable geometry schedules to improve engine efficiency, reduce fuel consumption, and increase aircraft cruise time under different missions. In this paper, the optimization variables, constraints, and optimization goals are proposed, and the mathematical performance optimization models of the adaptive cycle engine and the mixed flow turbofan engine are established. Compared with the traditional engines, the control laws of each variable geometry modulation are analyzed in terms of performance matching mechanism, and the regulation necessity of all the variable geometries is discussed. The optimal throttling characteristics lines of the adaptive cycle engine in different bypass modes are calculated by the particle swarm optimization method. The advantageous thrust ranges of the adaptive cycle engine in different operating modes are derived, and the design principles of split ratios is given according to the optimization resultsr.

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Detection of a weak Near-Infrared signal using a digital orthogonal-vector lock-in amplifier

Cited by 12 publications

References 10 publications

Frequency Acquisition Approach in Polarization-Modulated Ranging Based on Lock-in Analysis

Frequency Acquisition Approach in Polarization-Modulated Ranging Based on Lock-in Analysis

A measurement method in near infrared spectroscopy for reference correction with the homologous optical beams

Thermal cycle performance optimization and advantage analysis of an adaptive cycle engine in various bypass modes

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