Digital Lock-In Detection for Discriminating Multiple Modulation Frequencies With High Accuracy and Computational Efficiency

A fuel cell power conditioning system for online diagnosis and load leveling under the condition of varying load is developed in this study. The proposed system comprises a unidirectional boost converter and a bidirectional buck-boost converter with a battery. The system operates in two different modes. In normal mode, the bidirectional converter is utilized for load leveling; in diagnostic mode, it is utilized to control load voltage while the boost converter generates perturbation current to implement the online diagnosis function through in-situ electrochemical impedance spectroscopy (EIS). The proposed method can perform EIS for a fuel cell under varying-load conditions with no influence on the load. The validity and feasibility of the proposed system are verified by experiments, and the design procedure of the proposed system is detailed.

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“…(4). The advantage of the numerically generated reference signal is that it can be immunized from noise [23].…”

Section: B Impedance Measurement and Parameter Extractionmentioning

confidence: 99%

Design of a Fuel Cell Power Conditioning System for Online Diagnosis and Load Leveling

Nguyen¹,

Doan²,

Choi³

2016

Journal of Power Electronics

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“…This algorithm, previously outlined by Masciotti et al, uses averaging filters combined with modulation and sampling constraints to digitally extract the amplitude while reducing noise. 16 The demodulated amplitude is transmitted to the Bluetooth R module via a universal asynchronous receiver/transmitter interface.…”

Section: B Light Detectionmentioning

confidence: 99%

A wireless handheld probe with spectrally constrained evolution strategies for diffuse optical imaging of tissue

Flexman

Kim

Stoll

et al. 2012

Review of Scientific Instruments

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We present a low-cost, portable, wireless diffuse optical imaging device. The handheld device is fast, portable, and can be applied to a wide range of both static and dynamic imaging applications including breast cancer, functional brain imaging, and peripheral artery disease. The continuous-wave probe has four near-infrared wavelengths and uses digital detection techniques to perform measurements at 2.3 Hz. Using a multispectral evolution algorithm for chromophore reconstruction, we can measure absolute oxygenated and deoxygenated hemoglobin concentration as well as scattering in tissue. Performance of the device is demonstrated using a series of liquid phantoms comprised of Intralipid R , ink, and dye.

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“…The digital lock-in detection algorithm employed by this system was previously described in detail by Masciotti et al 36 The key feature of the algorithm is that it uses a simple averaging filter to extract the amplitude of the signal, but requires a specific relationship between f m , the frequency of the signal (7 and 5 kHz in this system), and N s , the number of samples acquired, as shown in the following mCPLD is idle waiting for a signal from the mDSP.…”

Section: Digital Demodulationmentioning

confidence: 99%

Digital optical tomography system for dynamic breast imaging

et al. 2011

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Abstract. Diffuse optical tomography has shown promising results as a tool for breast cancer screening and monitoring response to chemotherapy. Dynamic imaging of the transient response of the breast to an external stimulus, such as pressure or a respiratory maneuver, can provide additional information that can be used to detect tumors. We present a new digital continuous-wave optical tomography system designed to simultaneously image both breasts at fast frame rates and with a large number of sources and detectors. The system uses a master-slave digital signal processor-based detection architecture to achieve a dynamic range of 160 dB and a frame rate of 1.7 Hz with 32 sources, 64 detectors, and 4 wavelengths per breast. Included is a preliminary study of one healthy patient and two breast cancer patients showing the ability to identify an invasive carcinoma based on the hemodynamic response to a breath hold. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Digital Lock-In Detection for Discriminating Multiple Modulation Frequencies With High Accuracy and Computational Efficiency

Cited by 111 publications

References 17 publications

Design of a Fuel Cell Power Conditioning System for Online Diagnosis and Load Leveling

Design of a Fuel Cell Power Conditioning System for Online Diagnosis and Load Leveling

A wireless handheld probe with spectrally constrained evolution strategies for diffuse optical imaging of tissue

Digital optical tomography system for dynamic breast imaging

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