Articles de revista
http://hdl.handle.net/2117/1115
2024-03-28T23:02:05Z
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Sensor noise in LISA Pathfinder: laser frequency noise and its coupling to the optical test mass readout
http://hdl.handle.net/2117/405373
Sensor noise in LISA Pathfinder: laser frequency noise and its coupling to the optical test mass readout
Armano, M.; Audley, H.; Baird, J.; Binetruy, P.; Wollborn, Michael; Bortoluzzi, D.; Brandt, N.; Castelli, Eleonora; Cavalleri, A.; Cesarini, A.; Cruise, M.; Danzmann, K.; de Deus Silva, Marcus; Ramos Castro, Juan José
The LISA Pathfinder (LPF) mission successfully demonstrated the feasibility of the technology needed for the future space borne gravitational wave observatory LISA. A key subsystem under study was the laser interferometer, which measured the changes in relative distance in between two test masses (TMs). It achieved a sensitivity of 32.0 + 2.4 - 1.7 ¿ ¿ fm / v Hz , which was significantly better than the prelaunch tests. This improved performance allowed direct observation of the influence of laser frequency noise in the readout. The differences in optical path lengths between the measurement and reference beams in the individual interferometers of our setup determined the level of this undesired readout noise. Here, we discuss the dedicated experiments performed on LPF to measure these differences with high precision. We reached differences in path length difference between ( 368 ± 5 ) ¿ ¿ µm and ( 329.6 ± 0.9 ) ¿ ¿ µm which are significantly below the required level of 1 mm or 1000 ¿ ¿ µm . These results are an important contribution to our understanding of the overall sensor performance. Moreover, we observed varying levels of laser frequency noise over the course of the mission. We provide evidence that these do not originate from the laser frequency stabilization scheme which worked as expected. Therefore, this frequency stabilization would be applicable to other missions with similar laser frequency stability requirements.
2024-03-26T12:55:34Z
Armano, M.
Audley, H.
Baird, J.
Binetruy, P.
Wollborn, Michael
Bortoluzzi, D.
Brandt, N.
Castelli, Eleonora
Cavalleri, A.
Cesarini, A.
Cruise, M.
Danzmann, K.
de Deus Silva, Marcus
Ramos Castro, Juan José
The LISA Pathfinder (LPF) mission successfully demonstrated the feasibility of the technology needed for the future space borne gravitational wave observatory LISA. A key subsystem under study was the laser interferometer, which measured the changes in relative distance in between two test masses (TMs). It achieved a sensitivity of 32.0 + 2.4 - 1.7 ¿ ¿ fm / v Hz , which was significantly better than the prelaunch tests. This improved performance allowed direct observation of the influence of laser frequency noise in the readout. The differences in optical path lengths between the measurement and reference beams in the individual interferometers of our setup determined the level of this undesired readout noise. Here, we discuss the dedicated experiments performed on LPF to measure these differences with high precision. We reached differences in path length difference between ( 368 ± 5 ) ¿ ¿ µm and ( 329.6 ± 0.9 ) ¿ ¿ µm which are significantly below the required level of 1 mm or 1000 ¿ ¿ µm . These results are an important contribution to our understanding of the overall sensor performance. Moreover, we observed varying levels of laser frequency noise over the course of the mission. We provide evidence that these do not originate from the laser frequency stabilization scheme which worked as expected. Therefore, this frequency stabilization would be applicable to other missions with similar laser frequency stability requirements.
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On the use of fractional calculus to improve the pulse arrival time (PAT) detection when using photoplethysmography (PPG) and electrocardiography (ECG) signals
http://hdl.handle.net/2117/403725
On the use of fractional calculus to improve the pulse arrival time (PAT) detection when using photoplethysmography (PPG) and electrocardiography (ECG) signals
Mohammadpoor Faskhodi, Mahtab; García González, Miguel Ángel; Fernández Chimeno, Mireya; Guede Fernández, Federico; Mateu Mateus, Marc; Capdevilla, Lluis; Ramos Castro, Juan José
The pulse arrival time (PAT) has been considered a surrogate measure for pulse wave velocity (PWV), although some studies have noted that this parameter is not accurate enough. Moreover, the inter-beat interval (IBI) time series obtained from successive pulse wave arrivals can be employed as a surrogate measure of the RR time series avoiding the use of electrocardiogram (ECG) signals. Pulse arrival detection is a procedure needed for both PAT and IBI measurements and depends on the proper fiducial points chosen. In this paper, a new set of fiducial points that can be tailored using several optimization criteria is proposed to improve the detection of successive pulse arrivals. This set is based on the location of local maxima and minima in the systolic rise of the pulse wave after fractional differintegration of the signal. Several optimization criteria have been proposed and applied to high-quality recordings of a database with subjects who were breathing at different rates while sitting or standing. When a proper fractional differintegration order is selected by using the RR time series as a reference, the agreement between the obtained IBI and RR is better than that for other state-of-the-art fiducial points. This work tested seven different traditional fiducial points. For the agreement analysis, the median standard deviation of the difference between the IBI and RR time series is 5.72 ms for the proposed fiducial point versus 6.20 ms for the best-performing traditional fiducial point, although it can reach as high as 9.93 ms for another traditional fiducial point. Other optimization criteria aim to reduce the standard deviation of the PAT (7.21 ms using the proposed fiducial point versus 8.22 ms to 15.4 ms for the best- and worst-performing traditional fiducial points) or to minimize the standard deviation of the PAT attributable to breathing (3.44 ms using the proposed fiducial point versus 4.40 ms to 5.12 ms for best- and worst-performing traditional fiducial points). The use of these fiducial points may help to better quantify the beat-to-beat PAT variability and IBI time series.
2024-03-05T12:19:36Z
Mohammadpoor Faskhodi, Mahtab
García González, Miguel Ángel
Fernández Chimeno, Mireya
Guede Fernández, Federico
Mateu Mateus, Marc
Capdevilla, Lluis
Ramos Castro, Juan José
The pulse arrival time (PAT) has been considered a surrogate measure for pulse wave velocity (PWV), although some studies have noted that this parameter is not accurate enough. Moreover, the inter-beat interval (IBI) time series obtained from successive pulse wave arrivals can be employed as a surrogate measure of the RR time series avoiding the use of electrocardiogram (ECG) signals. Pulse arrival detection is a procedure needed for both PAT and IBI measurements and depends on the proper fiducial points chosen. In this paper, a new set of fiducial points that can be tailored using several optimization criteria is proposed to improve the detection of successive pulse arrivals. This set is based on the location of local maxima and minima in the systolic rise of the pulse wave after fractional differintegration of the signal. Several optimization criteria have been proposed and applied to high-quality recordings of a database with subjects who were breathing at different rates while sitting or standing. When a proper fractional differintegration order is selected by using the RR time series as a reference, the agreement between the obtained IBI and RR is better than that for other state-of-the-art fiducial points. This work tested seven different traditional fiducial points. For the agreement analysis, the median standard deviation of the difference between the IBI and RR time series is 5.72 ms for the proposed fiducial point versus 6.20 ms for the best-performing traditional fiducial point, although it can reach as high as 9.93 ms for another traditional fiducial point. Other optimization criteria aim to reduce the standard deviation of the PAT (7.21 ms using the proposed fiducial point versus 8.22 ms to 15.4 ms for the best- and worst-performing traditional fiducial points) or to minimize the standard deviation of the PAT attributable to breathing (3.44 ms using the proposed fiducial point versus 4.40 ms to 5.12 ms for best- and worst-performing traditional fiducial points). The use of these fiducial points may help to better quantify the beat-to-beat PAT variability and IBI time series.
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Electrical impedance tomography to measure spirometry parameters in chronic obstructive pulmonary disease patients
http://hdl.handle.net/2117/400935
Electrical impedance tomography to measure spirometry parameters in chronic obstructive pulmonary disease patients
Vargas Luna, José Miguel; Kashina, Svetlana; Riu Costa, Pere Joan; Casan Clará, Pere; Balleza Ordaz, José Marco
Spirometry is a test for the diagnosis of chronic obstructive pulmonary disease. It is a technique that can be intolerant due to the essential use of a mouthpiece and a clamp. This study proposes the use of electrical impedance tomogra phy to measure respiratory parameters. Patients underwent spirometry and three respiratory exercises. The imped ance signals were convolved, and the resultant was analyzed by fast Fourier transform. The frequency spectrum was divided into seven segments (R1 to R7). Each segment was represented in terms of quartiles (Q25%, Q50%, Q75%). Each quartile of each segment was correlated with the spirometric parameters to obtain a fitting equation. FVC was correlated 70% with the 3 quartiles of R7, 3 equations were obtained with a fit of 60%. FEV1 correlated 70% with the Q50% of R7, obtaining an equation with a fit of 40%. FEV1/FVC correlated 69% with Q75% of R2, obtaining an equation with a fit of 60%. Spirometric parameters can be estimated from the implied carrier frequency components of the ventilatory impedance signal.
2024-02-05T09:21:46Z
Vargas Luna, José Miguel
Kashina, Svetlana
Riu Costa, Pere Joan
Casan Clará, Pere
Balleza Ordaz, José Marco
Spirometry is a test for the diagnosis of chronic obstructive pulmonary disease. It is a technique that can be intolerant due to the essential use of a mouthpiece and a clamp. This study proposes the use of electrical impedance tomogra phy to measure respiratory parameters. Patients underwent spirometry and three respiratory exercises. The imped ance signals were convolved, and the resultant was analyzed by fast Fourier transform. The frequency spectrum was divided into seven segments (R1 to R7). Each segment was represented in terms of quartiles (Q25%, Q50%, Q75%). Each quartile of each segment was correlated with the spirometric parameters to obtain a fitting equation. FVC was correlated 70% with the 3 quartiles of R7, 3 equations were obtained with a fit of 60%. FEV1 correlated 70% with the Q50% of R7, obtaining an equation with a fit of 40%. FEV1/FVC correlated 69% with Q75% of R2, obtaining an equation with a fit of 60%. Spirometric parameters can be estimated from the implied carrier frequency components of the ventilatory impedance signal.
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Assessing pulmonary function parameters non-invasively by electrical bioimpedance tomography
http://hdl.handle.net/2117/400638
Assessing pulmonary function parameters non-invasively by electrical bioimpedance tomography
Vargas Luna, Miguel; Delgadillo Cano, Maria Isabel; Riu Costa, Pere Joan; Kashina, Svetlana; Balleza Ordaz, José Marco
The version of record is available online at: http://dx.doi.org/10.1007/s40846-023-00842-8
2024-01-31T12:39:42Z
Vargas Luna, Miguel
Delgadillo Cano, Maria Isabel
Riu Costa, Pere Joan
Kashina, Svetlana
Balleza Ordaz, José Marco
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Tilt-to-length coupling in LISA Pathfinder: a data analysis
http://hdl.handle.net/2117/400511
Tilt-to-length coupling in LISA Pathfinder: a data analysis
Armano, M.; Audley, H.; Baird, J.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Castelli, Eleonora; Cavalleri, A.; Cesarini, A.; Cruise, M.; Danzmann, K.; de Deus Silva, Marcus; Diepholz, I; Dixon, G.; Dolesi, R; Ramos Castro, Juan José
We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system’s alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass motion into the primary interferometric displacement readout. It was one of the major noise sources in the LISA Pathfinder mission and is likewise expected to be a primary noise source in LISA. We demonstrate here that a recently derived and published analytical model describes the dependency of the LISA Pathfinder tilt-to-length coupling noise on the alignment of the two freely falling test masses. This was verified with the data taken before and after the realignments performed in March (engineering days) and June 2016, and during a two-day experiment in February 2017 (long cross-talk experiment). The latter was performed with the explicit goal of testing the tilt-to-length coupling noise dependency on the test mass alignment. Using the analytical model, we show that all realignments performed during the mission were only partially successful and explain the reasons why. In addition to the analytical model, we computed another physical tilt-to-length coupling model via a minimizing routine making use of the long cross-talk experiment data. A similar approach could prove useful for the LISA mission.
2024-01-30T10:35:25Z
Armano, M.
Audley, H.
Baird, J.
Binetruy, P.
Born, M.
Bortoluzzi, D.
Castelli, Eleonora
Cavalleri, A.
Cesarini, A.
Cruise, M.
Danzmann, K.
de Deus Silva, Marcus
Diepholz, I
Dixon, G.
Dolesi, R
Ramos Castro, Juan José
We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system’s alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass motion into the primary interferometric displacement readout. It was one of the major noise sources in the LISA Pathfinder mission and is likewise expected to be a primary noise source in LISA. We demonstrate here that a recently derived and published analytical model describes the dependency of the LISA Pathfinder tilt-to-length coupling noise on the alignment of the two freely falling test masses. This was verified with the data taken before and after the realignments performed in March (engineering days) and June 2016, and during a two-day experiment in February 2017 (long cross-talk experiment). The latter was performed with the explicit goal of testing the tilt-to-length coupling noise dependency on the test mass alignment. Using the analytical model, we show that all realignments performed during the mission were only partially successful and explain the reasons why. In addition to the analytical model, we computed another physical tilt-to-length coupling model via a minimizing routine making use of the long cross-talk experiment data. A similar approach could prove useful for the LISA mission.
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Rapid emission check of photovoltaic installations using time domain measurements
http://hdl.handle.net/2117/399586
Rapid emission check of photovoltaic installations using time domain measurements
Azpúrua Auyanet, Marco Aurelio; Solé-Lloveras, Jordi; Marthinsen, Roger; Silva Martínez, Fernando
This article represents a contribution to the Rapid Emission Check of installations project in IEC CISPR Sub Committee A (SC A) Joint Working Group 9 (JWG9). Time domain measurements are used to identify sources and critical frequencies of radiated electromagnetic emissions. The objective of such a said quick evaluation is to provide PV installers with a procedure and affordable tools to effectively detect new interference situations arising from PV installations. IEC CISPR SC A JWG9 was established in 2023 and is tasked with developing guidelines for Rapid Emission Checks addressed to stakeholders like installers. This group will consider quick alternatives with more affordable instrumentation and test methods than those used when testing according to international standards in accredited laboratories. The proposal in this article includes a reduced test sequence regarding the number of measurement points and axis compared to more extensive methods in other CISPR publications. In the study case presented, oscilloscope-based time domain emissions measurements provide an agile and cost-effective alternative compared to traditional EMI receivers.
© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2024-01-16T10:12:07Z
Azpúrua Auyanet, Marco Aurelio
Solé-Lloveras, Jordi
Marthinsen, Roger
Silva Martínez, Fernando
This article represents a contribution to the Rapid Emission Check of installations project in IEC CISPR Sub Committee A (SC A) Joint Working Group 9 (JWG9). Time domain measurements are used to identify sources and critical frequencies of radiated electromagnetic emissions. The objective of such a said quick evaluation is to provide PV installers with a procedure and affordable tools to effectively detect new interference situations arising from PV installations. IEC CISPR SC A JWG9 was established in 2023 and is tasked with developing guidelines for Rapid Emission Checks addressed to stakeholders like installers. This group will consider quick alternatives with more affordable instrumentation and test methods than those used when testing according to international standards in accredited laboratories. The proposal in this article includes a reduced test sequence regarding the number of measurement points and axis compared to more extensive methods in other CISPR publications. In the study case presented, oscilloscope-based time domain emissions measurements provide an agile and cost-effective alternative compared to traditional EMI receivers.
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Arousal detection by using ultra-short-term heart rate variability (HRV) analysis
http://hdl.handle.net/2117/397166
Arousal detection by using ultra-short-term heart rate variability (HRV) analysis
Mohammadpoor Faskhodi, Mahtab; Fernández Chimeno, Mireya; García González, Miguel Ángel
Introduction: The study of arousal is crucial as it helps to understand the role of increased physiological and psychological activation in emotions, motivation, cognitive performance, stress responses, sleep-wake cycles, and clinical application. Recent studies have shown that arousal is commonly associated with physiological changes including heart rate variability (HRV) as indicated by RR intervals. In some applications, the analysis requires analyzing short segments of RR time series, shorter than the usual 5 min HRV. The objective of this study is to check the performance of ultra-short-term HRV indices to track changes in arousal.
Method: In this study, to follow arousal changes, 31 healthy subjects were examined in both non-arousal (relaxed) and aroused states. Two states of 5 minutes each are used to measure the relaxed and arousal states. After data collection, RR time series segments were obtained randomly for each subject in arousal and relaxed states in the 30s, 60s, 120s, and 240s time windows. Next, 17 ultra-short-term HRV indices were computed for each time window for RR intervals in relaxed and aroused states.
2023-11-28T13:38:40Z
Mohammadpoor Faskhodi, Mahtab
Fernández Chimeno, Mireya
García González, Miguel Ángel
Introduction: The study of arousal is crucial as it helps to understand the role of increased physiological and psychological activation in emotions, motivation, cognitive performance, stress responses, sleep-wake cycles, and clinical application. Recent studies have shown that arousal is commonly associated with physiological changes including heart rate variability (HRV) as indicated by RR intervals. In some applications, the analysis requires analyzing short segments of RR time series, shorter than the usual 5 min HRV. The objective of this study is to check the performance of ultra-short-term HRV indices to track changes in arousal.
Method: In this study, to follow arousal changes, 31 healthy subjects were examined in both non-arousal (relaxed) and aroused states. Two states of 5 minutes each are used to measure the relaxed and arousal states. After data collection, RR time series segments were obtained randomly for each subject in arousal and relaxed states in the 30s, 60s, 120s, and 240s time windows. Next, 17 ultra-short-term HRV indices were computed for each time window for RR intervals in relaxed and aroused states.
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A serious game to self-regulate heart rate variability as a technique to manage arousal level through cardiorespiratory biofeedback: development and pilot evaluation study
http://hdl.handle.net/2117/396667
A serious game to self-regulate heart rate variability as a technique to manage arousal level through cardiorespiratory biofeedback: development and pilot evaluation study
Estrella Arraez, Toni; Alfonso Martín, Carla; Ramos Castro, Juan José; Alsina Rodriguez, Aitor; Capdevila, Lluis
2023-11-20T09:27:36Z
Estrella Arraez, Toni
Alfonso Martín, Carla
Ramos Castro, Juan José
Alsina Rodriguez, Aitor
Capdevila, Lluis
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Fluid-dependent single-frequency bioelectrical impedance fat mass estimates compared to digital imaging and dual X-ray absorptiometry
http://hdl.handle.net/2117/396205
Fluid-dependent single-frequency bioelectrical impedance fat mass estimates compared to digital imaging and dual X-ray absorptiometry
Nescolarde Selva, Lexa Digna; Orlandi, Carmine; Farina, Gian Luca; Gori, Niccolò; Lukaski, Henry
The need for a practical method for routine determination of body fat has progressed from body mass index (BMI) to bioelectrical impedance analysis (BIA) and smartphone two-dimensional imaging. We determined agreement in fat mass (FM) estimated with 50 kHz BIA and smartphone single lateral standing digital image (SLSDI) compared to dual X-ray absorptiometry (DXA) in 188 healthy adults (69 females and 119 males). BIA underestimated (p < 0.0001) FM, whereas SLSDI FM estimates were not different from DXA values. Based on limited observations that BIA overestimated fat-free mass (FFM) in obese adults, we tested the hypothesis that expansion of the extracellular water (ECW), expressed as ECW to intracellular water (ECW/ICW), results in underestimation of BIA-dependent FM. Using a general criterion of BMI > 25 kg/m2, 54 male rugby players, compared to 40 male non-rugby players, had greater (p < 0.001) BMI and FFM but less (p < 0.001) FM and ECW/ICW. BIA underestimated (p < 0.001) FM in the non-rugby men, but SLSDI and DXA FM estimates were not different in both groups. This finding is consistent with the expansion of ECW in individuals with excess body fat due to increased adipose tissue mass and its water content. Unlike SLSDI, 50 kHz BIA predictions of FM are affected by an increased ECW/ICW associated with greater adipose tissue. These findings demonstrate the validity, practicality, and convenience of smartphone SLSDI to estimate FM, seemingly not influenced by variable hydration states, for healthcare providers in clinical and field settings.
2023-11-09T14:01:01Z
Nescolarde Selva, Lexa Digna
Orlandi, Carmine
Farina, Gian Luca
Gori, Niccolò
Lukaski, Henry
The need for a practical method for routine determination of body fat has progressed from body mass index (BMI) to bioelectrical impedance analysis (BIA) and smartphone two-dimensional imaging. We determined agreement in fat mass (FM) estimated with 50 kHz BIA and smartphone single lateral standing digital image (SLSDI) compared to dual X-ray absorptiometry (DXA) in 188 healthy adults (69 females and 119 males). BIA underestimated (p < 0.0001) FM, whereas SLSDI FM estimates were not different from DXA values. Based on limited observations that BIA overestimated fat-free mass (FFM) in obese adults, we tested the hypothesis that expansion of the extracellular water (ECW), expressed as ECW to intracellular water (ECW/ICW), results in underestimation of BIA-dependent FM. Using a general criterion of BMI > 25 kg/m2, 54 male rugby players, compared to 40 male non-rugby players, had greater (p < 0.001) BMI and FFM but less (p < 0.001) FM and ECW/ICW. BIA underestimated (p < 0.001) FM in the non-rugby men, but SLSDI and DXA FM estimates were not different in both groups. This finding is consistent with the expansion of ECW in individuals with excess body fat due to increased adipose tissue mass and its water content. Unlike SLSDI, 50 kHz BIA predictions of FM are affected by an increased ECW/ICW associated with greater adipose tissue. These findings demonstrate the validity, practicality, and convenience of smartphone SLSDI to estimate FM, seemingly not influenced by variable hydration states, for healthcare providers in clinical and field settings.
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Strategies using time-domain measurements for radiated emissions testing in harsh environments
http://hdl.handle.net/2117/394214
Strategies using time-domain measurements for radiated emissions testing in harsh environments
Solé Lloveras, Jordi; Azpúrua Auyanet, Marco Aurelio; Yoshioka, Yasutoshi; Silva Martínez, Fernando
Performing in-situ radiated emissions measurements, that is, in locations different from a standard test site, can be a challenging task because of the high electromagnetic noise levels in the ambient. A harsh electromagnetic environment characterizes such sites, and it usually results in difficulties when discerning between emissions from the equipment under test (EUT) and electromagnetic fields generated by surrounding devices. Moreover, communication signals from broadcasting services are generally significantly higher than the standard emission limits, making it even harder to determine compliance. In this article, we present different techniques leveraging the advantages of time-domain measurement systems to provide effective and practical solutions to mitigate ambient noise’s effect on radiated electromagnetic interference measurements. First, the test method used is described, and pragmatic considerations are given to ensure reliable and repeatable measurements. Multichannel time-domain measurement systems are introduced as the fundamental tool for the proposed strategies. Subsequently, different study cases are evaluated with real test examples, highlighting several criteria intended to reduce the impact of ambient noise on the actual emissions measures produced by the EUT. Finally, a real application of those strategies for measuring a photovoltaic system is described. Overall, the methods employed and the main advantages of using full-time-domain FFT-based receivers are reviewed. In addition, the possibility of incorporating this article’s outcomes into forthcoming electromagnetic standards about in-situ radiated emission measurements is also debated.
© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
2023-09-28T11:12:34Z
Solé Lloveras, Jordi
Azpúrua Auyanet, Marco Aurelio
Yoshioka, Yasutoshi
Silva Martínez, Fernando
Performing in-situ radiated emissions measurements, that is, in locations different from a standard test site, can be a challenging task because of the high electromagnetic noise levels in the ambient. A harsh electromagnetic environment characterizes such sites, and it usually results in difficulties when discerning between emissions from the equipment under test (EUT) and electromagnetic fields generated by surrounding devices. Moreover, communication signals from broadcasting services are generally significantly higher than the standard emission limits, making it even harder to determine compliance. In this article, we present different techniques leveraging the advantages of time-domain measurement systems to provide effective and practical solutions to mitigate ambient noise’s effect on radiated electromagnetic interference measurements. First, the test method used is described, and pragmatic considerations are given to ensure reliable and repeatable measurements. Multichannel time-domain measurement systems are introduced as the fundamental tool for the proposed strategies. Subsequently, different study cases are evaluated with real test examples, highlighting several criteria intended to reduce the impact of ambient noise on the actual emissions measures produced by the EUT. Finally, a real application of those strategies for measuring a photovoltaic system is described. Overall, the methods employed and the main advantages of using full-time-domain FFT-based receivers are reviewed. In addition, the possibility of incorporating this article’s outcomes into forthcoming electromagnetic standards about in-situ radiated emission measurements is also debated.