Embedded system based data acquisition and control system for photoacoustic spectroscopic applications

Tátrai, Dávid; Bozóki, Zoltán; Gulyas, Gabor; Szabó, Gábor

doi:10.1016/j.measurement.2014.12.028

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Reconfiguration reduces FPGA resource requirements and simplifies a chip logic compared to a static logic, which impacts system performance. The example of an FPGA-based reconfigurable system, in which new mea-surement protocols can be run without significant hardware modifications, is presented in [21], for example. The reconfiguration of the system is completed at the microprocessor level through the exchange of subroutines of real-time application that run on an embedded microprocessor.…”

Section: Related Workmentioning

confidence: 99%

A Run-Time Reconfiguration Method for an FPGA-Based Electrical Capacitance Tomography System

et al. 2022

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A desirable feature of an electrical capacitance tomography system is the adaptation possibility to any sensor configuration and measurement mode. A run-time reconfiguration of a system for electrical capacitance tomography is presented. An original mechanism is elaborated to reconfigure, on the fly, a modular EVT4 system with multiple FPGAs installed. The outlined system architecture is based on FPGA programmable logic devices (Xilinx Spartan) and PicoBlaze soft-core processors. Soft-core processors are used for communication, measurement control and data preprocessing. A novel method of FPGA partial reconfiguration is described, in which a PicoBlaze soft-core processor is used as a reconfiguration controller. Behavioral reconfiguration of the system is obtained by providing run-time access to the program code of a soft-core control processor. The tests using EVT4 hardware and different algorithms for tomographic scanning were performed. A test object was measured using 2D and 3D sensors. The time and resources required for the examined reconfiguration procedure are evaluated.

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Section: Related Workmentioning

confidence: 99%

A Run-Time Reconfiguration Method for an FPGA-Based Electrical Capacitance Tomography System

et al. 2022

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“…Referring to Rosencwaig-Gersho (RG) theory, the photoacoustic signal amplitude A P A will correlate with the thermal diffusion length of the material [26]. In the case of optically opaque material, two different states might occur as expressed by…”

Section: Photoacoustic Multilayer Analysismentioning

confidence: 99%

Subsurface detection of opaque and solid material defect based on photoacoustic effect

et al. 2020

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This study develops a subsurface detection system based on a photoacoustic effect. The main parts of the system are a laser diode as an exciter, a standard microphone as an acoustic detector, and a software-based phase sensitive detection (PSD) method. Artificial defects of various depths were made inside an alumunium plate as the object which was painted with acrylic paint to cover the defects. The difference in the thermal diffusivity of alumunium and acrylic paint will cause different amplitudes of photoacoustic so they can be used to detect the subsurface defects. Photoacoustic signal amplitudes used in this study as measured by a microphone have an average amplitude of −57 dB with an SNR of 11.2. High noise level was found below 2.153 Hz, so that the photoacoustic signal amplitude cannot be detected. The accuracy of PSD method was tested by measuring amplitude of 400-600 Hz sinusoidal voltages from a signal generator. The range of the amplitudes was 0.73-6.27 µV with a resulting maximum error of 9%. The PSD method was succesfully implemented to detect the subsurface defects of a 300 µm thick alumunium plate at depths of 215 µm, 241 µm, and 254 µm with a resulting maximum error of 5.83%.

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Embedded System for the Analysis of Thermal Properties of Hemoglobin

Castañeda-Miranda¹,

Castaño

2023

Biomedical Materials & Devices

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A novel embedded photoacoustic system design is described and a calculation method is proposed to determine the blood hemoglobin oxygen saturation through the thermal properties of different skin color types. A heat equation model allows a calculation procedure to determine the reflection and transmitted thermal wave amplitude for obtaining a depth profile, depending on the modulation frequency at the air-skin-subcutaneous tissue interface. Our reflection-mode photoacoustic technique involves the use of a 445 nm pulsed-laser light spot on subcutaneous tissue to obtain amplitude and phase from signals for different skin color types. The transmission and reflection temperature coefficients are fitted through a heat propagation model to estimate the thermal wave properties of blood hemoglobin. Nonlinearly amplified photoacoustic signals are modeled from the microphone and their stability analyzed by a bode diagram, as to consider overheated hemoglobin background. An dedicated electronic embedded system is thus integrated, including memory, processor and preprocessor, to provide a simple measurement technique, as compared to conventional instruments.

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Embedded system based data acquisition and control system for photoacoustic spectroscopic applications

Cited by 4 publications

References 26 publications

A Run-Time Reconfiguration Method for an FPGA-Based Electrical Capacitance Tomography System

A Run-Time Reconfiguration Method for an FPGA-Based Electrical Capacitance Tomography System

Subsurface detection of opaque and solid material defect based on photoacoustic effect

Embedded System for the Analysis of Thermal Properties of Hemoglobin

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