Lock-in-detection in 87Rb–129Xe/131Xe atom spin gyroscopes

Lee, Sangkyung; Yim, Sin Hyuk; Kim, Tae Hyun; Kim, Zaeill; Shim, Kyu-Min

doi:10.1088/1361-6455/ab56db

Cited by 11 publications

(2 citation statements)

References 25 publications

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“…The lock-in amplifier (LIA) is a mature weak signal detection method extensively used in spectroscopy signal analysis [16] and atom spin gyroscope signal processing [17]. The LIA uses the principle that the measured signal is not correlated with noise.…”

Section: Introductionmentioning

confidence: 99%

A Software Digital Lock-In Amplifier Method with Automatic Frequency Estimation for Low SNR Multi-Frequency Signal

et al. 2022

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In the fault diagnosis field, the fault feature signal is weak and contaminated by the noise. The lock-in amplifier is a useful tool for weak signal detection. Aiming to the amplitude error of the lock-in amplifier caused by frequency deviation between the measured signal and the reference signal, a DFT-based automatic signal frequency estimation method is studied to improve the frequency accuracy of the reference signal. Based on this frequency estimation method, a software digital lock-in amplifier method is proposed to detect the multiple frequencies signals. This proposed method can automatically measure the frequency value of the measured signal without prior frequency information. Then, the reference signals are generated through this frequency value to make the digital lock-in amplifier estimate the amplitude of the measured signal. Moreover, an iterative structure is used to implement the multiple frequencies signal measurement. The frequencies and amplitudes measurement accuracies are tested. Under different SNR conditions, the frequency relative error is less than 0.1%. In addition, the amplitude relative error with different signal frequencies is less than 1.7% when the SNR is −1 dB. This proposed software digital lock-in amplifier method has a higher signal frequency tracking ability and amplitude measurement accuracy.

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Section: Introductionmentioning

confidence: 99%

A Software Digital Lock-In Amplifier Method with Automatic Frequency Estimation for Low SNR Multi-Frequency Signal

et al. 2022

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“…In recent years, weak signal detection technology based on the correlation detection principle has developed rapidly. With its unique and simple signal processing method, lock-in amplification, with its unique and simple signal processing method, can extract the effective signal from an environment with strong noise and is widely applied in industry [18,19]. Although lock-in amplification technology can improve the flow measurement performance of an electromagnetic flowmeter under special working conditions, the induction electromotive signal of an electromagnetic flowmeter is not the ideal symmetry because of the different kinds of interference in the induction electromotive signal, and the processing method of single lock-in amplification still needs to be improved.…”

Section: Introductionmentioning

confidence: 99%

Study on a New Electromagnetic Flow Measurement Technology Based on Differential Correlation Detection

Chen

Tian

et al. 2020

Sensors

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Under the conditions of low flow rate and strong noise, the current electromagnetic flowmeter (EMF) cannot satisfy the requirement for measurement or separate the actual flow signal and interference signal accurately. Correlation detection technology can reduce the bandwidth and suppress noise effectively using the periodic transmission of signal and noise randomness. As for the problem that the current anti-interference technology cannot suppress noise effectively, the noise and interference of the electromagnetic flowmeter were analyzed in this paper, and a design of the electromagnetic flowmeter based on differential correlation detection was proposed. Then, in order to verify the feasibility of the electromagnetic flow measurement system based on differential correlation, an experimental platform for the comparison between standard flow and measured flow was established and a verification experiment was carried out under special conditions and with flow calibration measurements. Finally, the data obtained in the experiment were analyzed. The research result showed that an electromagnetic flowmeter based on differential correlation detection satisfies the need for measurement completely. The lower limit of the flow rate of the electromagnetic flowmeter based on the differential correlation principle could reach 0.084 m/s. Under strong external interferences, the electromagnetic flowmeter based on differential correlation had a fluctuation range in output value of only 10 mV. This shows that the electromagnetic flowmeter based on the differential correlation principle has unique advantages in measurements taken under the conditions of strong noise, slurry flow, and low flow rate.

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Performance comparison between $$^{87}$$Rb-natural Xe–$$\hbox {N}_2$$ and $$^{87}$$Rb–$$^{129}$$Xe–$$^{131}$$Xe–$$\hbox {N}_2$$ atom spin gyroscopes

Lee

Shim

et al. 2021

J. Korean Phys. Soc.

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Lock-in-detection in ⁸⁷Rb–¹²⁹Xe/¹³¹Xe atom spin gyroscopes

Cited by 11 publications

References 25 publications

A Software Digital Lock-In Amplifier Method with Automatic Frequency Estimation for Low SNR Multi-Frequency Signal

A Software Digital Lock-In Amplifier Method with Automatic Frequency Estimation for Low SNR Multi-Frequency Signal

Study on a New Electromagnetic Flow Measurement Technology Based on Differential Correlation Detection

Performance comparison between $$^{87}$$Rb-natural Xe–$$\hbox {N}_2$$ and $$^{87}$$Rb–$$^{129}$$Xe–$$^{131}$$Xe–$$\hbox {N}_2$$ atom spin gyroscopes

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