A Wireless and Passive Low-Pressure Sensor

Nicolay, Pascal; Lenzhofer, M.

doi:10.3390/s140203065

Cited by 16 publications

(18 citation statements)

References 14 publications

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“…Because of the working principle, the sensitivity (and therefore, the accuracy) is much higher at low pressure, in the so-called Knudsen regime (∼ [0.1 -100 mTorr]). The sensitivity of a similar sensor was characterized in [10]. It was found to be close to 0.17 • C/Pa at low pressure.…”

Section: Fig 2 Equivalent Circuit Of the Sensor Architecturementioning

confidence: 94%

“…The computation of the equivalent resistance of air (R Air ) is also described in [10]. However, higher pressure steps were applied in the present study, which resulted in lower R Air values.…”

Section: Equivalent System Modelmentioning

confidence: 99%

“…The computation of R and C values for the PCB and the housing are described in details in [10]. The computation of the equivalent resistance of air (R Air ) is also described in [10].…”

Section: Equivalent System Modelmentioning

confidence: 99%

“…The model is based on thermal-electrical analogy, as described in [9], [10]. Using this analogy, a given sub-element of the sensor is described using a capacitor and a resistor mounted in parallel, where the electrical capacitance equals the heat capacity of the element and the electrical resistance equals its thermal resistance.…”

Section: Equivalent System Modelmentioning

confidence: 99%

“…After optimization of the sensor architecture, new sensor versions have been successively characterized in [5]- [7] where excellent sensitivity of the sensor has been observed. As a next step towards an autonomous system, the authors have tried to supply the heating element via a half-bridge architecture and a resonant transformer usually employed for wireless charging systems [10]. This power transmission scheme is moderately efficient and is successfully used in nowadays wireless cell phone chargers.…”

Section: Introductionmentioning

confidence: 99%

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A completely wireless and passive low-pressure sensor

Krall

Nicolay

2015

2015 IEEE Tenth International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP)

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In this paper we present a low pressure sensor based on the Pirani principle. Conversely to conventional implementations, this novel concept employs a fully wireless approach for energy supply and readout of the sensor. The energy for the used heating element is harvested from conventional power supply lines. Furthermore, we used a fully passive sensor to measure the pressure value. Both parts together offer a flexible sensor concept which can solve current implementation drawbacks of size and wired connection to this kind of sensors. The presented sensor concept is completely autonomous and offers a cheap and flexible alternative to conventional sensors even on places not easy to access and without the need for maintenance. For the whole sensor system a simulation model is derived and the model is compared to measurements. The accuracy of the model for the autonomous sensor is shown over a large area of pressure.

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Section: Fig 2 Equivalent Circuit Of the Sensor Architecturementioning

confidence: 94%

Section: Equivalent System Modelmentioning

confidence: 99%

“…The computation of R and C values for the PCB and the housing are described in details in [10]. The computation of the equivalent resistance of air (R Air ) is also described in [10].…”

Section: Equivalent System Modelmentioning

confidence: 99%

Section: Equivalent System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A completely wireless and passive low-pressure sensor

Krall

Nicolay

2015

2015 IEEE Tenth International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP)

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Scalable Fabrication of Flexible Single‐Layer Strain and Double‐Layer Pressure Sensors by Inkjet Printing for Subtle Vibration Detection

Gai

Zhang

et al. 2021

Adv Materials Inter

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Flexible sensors have attracted tremendous attentions in subtle force/vibration detection, human motion/health monitoring, and other related application fields. Although various sensors are developed to meet this growing demand, it is still a huge challenge to prepare satisfactory sensors with ultrahigh sensitivity and superior stability. In this work, a double‐layer flexible sensor is successfully prepared via an efficient and designable inkjet printing approach. Metallic silver layers are deposited onto polyurethane acrylate substrates with or without microstructures to form the flexible electrodes. The combination of a flat electrode and a microstructured electrode finally becomes a durable double‐layer flexible sensor with ultrahigh sensitivity and superior stability. Besides, the flexible flat electrodes can also be applied as single‐layer sensors. An ultrahigh sensitivity (maximum gauge factor of >1100), favorable durability (>1000 cycles), and fast response time (≈90 ms) are achieved simultaneously in a flat single‐layer sensor, while the combined double‐layer sensor presents quick response capability to small pressures (≈250 Pa). Moreover, these single‐layer and double‐layer sensors can monitor a variety of physiological signals (e.g., human pulse waveform, breathing behavior, and voice recognition), indicating their promising applications in wearable electronics.

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