Acquisition system for pressure sensor network

Golfarelli, A.; Zagnoni, Michele; Proli, Paolo; Callegari, Sergio; Talamelli, Alessandro; Sangiorgi, E.; Tartagni, Marco

doi:10.1109/icsens.2004.1426231

Cited by 7 publications

(8 citation statements)

References 5 publications

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“…The collection of data thus needs only electric means and can require as little as a couple of wires shared among all sensors if serial communication is adopted. The interested reader is invited to check [8] and [14] which offer an in-depth view of the sensing strips and interfacing.…”

Section: Sensing Technologiesmentioning

confidence: 99%

Experiments on aircraft flight parameter detection by on-skin sensors

Callegari

Zagnoni²,

Golfarelli

et al. 2006

Sensors and Actuators A: Physical

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Air speed and flight attitude angles are fundamental parameters for manual of automatic control of flying bodies. Conventional measurement methods rely on probes (e.g. Pitot tubes or vanes) having a one-to-one correspondence with the physical quantities of interest and requiring specific placements. Here, a novel measurement approach is proposed, relying on indirect measurement and on a plurality of pressure readings made by thin capacitive sensors directly placed on the aircraft skin. A redundant number of probes relaxes the accuracy requirements posed on the individual units and helps achieving fault detection or fault tolerance. A strategy for efficiently processing/combining sensor data is herein presented together with an error propagation analysis, and experimental data.

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Section: Sensing Technologiesmentioning

confidence: 99%

Experiments on aircraft flight parameter detection by on-skin sensors

Callegari

Zagnoni²,

Golfarelli

et al. 2006

Sensors and Actuators A: Physical

Self Cite

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“…As expected, errors are below 30 fF. This can be confronted to the accuracy of an interface built out of standard parts [12], which can be in the 5-10 fF range, about a factor 2-3 better than the FPAA interface. Note that for many capacitive sensing tasks the accuracy of the FPAA interface (which can be in any case improved by a reduction in C p ) is perfectly acceptable.…”

Section: Sample Applicationmentioning

confidence: 89%

“…(12) and typical FPAA data, it can be seen that FPAA based circuits can be capable of capacitive sensing in the sub-pF range, but hardly below the hundred fF threshold. This is about one order of magnitude worse than the best ASIC interfaces [10,11] and more than an octave worse than the best interfaces built out of off-the-shelf parts [12,13], yet it is still suitable to a vast range of applications. Here, the distinct advantages of the FPAA approach can conversely represent a decisive point over ASICs and standard part circuits.…”

Section: Performance Analysismentioning

confidence: 91%

“…For instance, with the usual AN10E40 data, for C p = 50 pF and a ±5% uncertainty over it, the uncertainty over C x is at least ±25 fF. The relation (12) gives us an important bound on the capacitance variations that can be detected with the proposed FPAA based approach. Other sources of error clearly include noise in the signal processing chain, yet this can be treated as in conventional charge amplifiers.…”

Section: Performance Analysismentioning

confidence: 95%

“…Other sources of error clearly include noise in the signal processing chain, yet this can be treated as in conventional charge amplifiers. Note that in many cases, and specifically whenever external cabling from the sensor to the interface is involved, (12) can be assumed to be a dominant error source. From Eq.…”

Section: Performance Analysismentioning

confidence: 99%

See 2 more Smart Citations

Applicability of Field Programmable Analog Arrays to Capacitive Sensing in the Sub-pF Range

Callegari

Merendino

Golfarelli

et al. 2006

Analog Integr Circ Sig Process

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FPAAs have recently been introduced to reduce analog design costs and bridge the gap between ASICs and circuits made of standard-parts. Here, their applicability to capacitive sensing is investigated. Switched-mode FPAAs were not originally introduced for the readout of elementary sensors or their desensitization from parasitics. Nonetheless, we show that specific techniques can make them up to the task of reading capacitance variations in the tens fF range. We also show that FPAA sensor interfaces can achieve automatic, trimmer-free calibration by FPAA reconfiguration. We conclude by illustrating a sample application as a proof-of-concept of the proposed techniques.

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