Application of digital quadrature lock-in amplifier in TDLAS humidity detection

Zhang, Keke; Zhang, Lijuan; Zhao, Qiang; Liu, Shixuan; Chen, Shizhe; Wu, Yushang; Wang, Kai; Yang, Xianglong

doi:10.1117/12.2281751

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…In the development of TDLAS, many methods have been proposed to improve system accuracy and to measure resolution [17,18,19,20,21,22], which can be divided into two classes: software processing and hardware-based processing. Some hardware-based approaches such as multi-pass cells, differential schemes, and wavelength modulation techniques have been proved to ameliorate signal quality effectively [23,24,25,26].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Methods and Algorithms for Improving Near-Infrared Tunable Diode-Laser Absorption Spectroscopy

Zhang

Kang

Meng

et al. 2018

Sensors

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Tunable diode laser absorption spectroscopy technology (TDLAS) has been widely applied in gaseous component analysis based on gas molecular absorption spectroscopy. When dealing with molecular absorption signals, the desired signal is usually interfered by various noises from electronic components and optical paths. This paper introduces TDLAS-specific signal processing issues and summarizes effective algorithms so solve these.

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Section: Introductionmentioning

confidence: 99%

Mathematical Methods and Algorithms for Improving Near-Infrared Tunable Diode-Laser Absorption Spectroscopy

Zhang

Kang

Meng

et al. 2018

Sensors

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“…out is measured by the average values of two sets of electrodes V2-4 and V3-5, which can eliminate the impact of inconsistent branch currents formed by the two sets of electrodes. The lock-in amplifier circuits are used to extract weak electrical signals in marine strong noise environments, which is widely used in weak signal detection[11][12] .…”

mentioning

confidence: 99%

Development and application of seven-electrode temperature and salinity sensor

ZHANG,

et al. 2024

Ninth International Symposium on Sensors, Mechatronics, and Automation System (ISSMAS 2023)

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The temperature and salinity of seawater are essential physical parameters for marine science. The measurement of conductivity is an important means of salinity measurement. In this article, seven electrodes are used to design a temperature and salinity sensor. The sensor detects voltage signal and current signal in strong marine noise environments using lock-in amplifier technology to improve the measurement accuracy of seawater conductivity. A seven-electrode temperature and salinity sensor and a Seabird SBE37-SI temperature and salinity sensor are used for laboratory comparison, the temperature measurement error and the conductivity measurement error are within ±0.005℃ and ±0.0003s/m. The temperature and salinity sensor is installed on an ocean buoy, and offshore testing is carried out. The test data shows that the sensor's measurement data is accurate and reliable, and can be used to measure the temperature, conductivity, and salinity of seawater.

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Application of digital quadrature lock-in amplifier in TDLAS humidity detection

Cited by 2 publications

References 4 publications

Mathematical Methods and Algorithms for Improving Near-Infrared Tunable Diode-Laser Absorption Spectroscopy

Mathematical Methods and Algorithms for Improving Near-Infrared Tunable Diode-Laser Absorption Spectroscopy

Development and application of seven-electrode temperature and salinity sensor

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