Temperature Sensor With High Sensitivity and Wide Detection Range Based on Mach-Zehnder Interferometer and Few-Mode Fiber

Meng, Xiaojian; Li, Shuguang; Li, Jianshe; Guo, Ying; Li, Zenghui; shao, pengshuai; Bai, Ge

doi:10.1109/jsen.2022.3216631

Cited by 7 publications

(1 citation statement)

References 29 publications

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“…A Lock-in Amplifier (LIA) is designed to extract signals with known carrier waves from highly noisy environments. 1 It has proven to be a highly effective signal processing system, finding widespread applications in various fields, including lock-in imaging, 2 spectral analysis, 3 medical diagnosis, 4 environmental monitoring, 5 industrial production, 6 and more. LIAs can be categorized into analog, digital, and universal types based on their different designs and implementation techniques.…”

Section: Introductionmentioning

confidence: 99%

Virtual digital lock-in amplifier for SO2 photoacoustic spectroscopic detection

Liu,

Chen,

Chen

et al. 2023

6th Optics Young Scientist Summit (OYSS 2023)

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Lock-in amplifier (LIA) plays a crucial role in the field of photoacoustic trace gas detection. In this paper, we introduce an innovative concept termed the virtual digital Lock-in Amplifier (VDLIA) using matched filtering techniques. The VDLIA exhibits exceptional proficiency in accurately determining both the amplitude and phase of sinusoidal signals, even in the presence of heightened levels of noise. Pivotal factors influencing the VDLIA's performance, including the characteristics of the low-pass filter, and the resolution of the analog-to-digital converter (ADC), were examined under diverse noise conditions. To evaluate the effectiveness of the VDLIA, it was integrated into a photoacoustic system designed for the detection of SO 2 concentration. Experimental results demonstrate that the output results of the proposed VDLIA closely align with those generated by a commercial LIA, offering significant potential for various industrial applications.

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