Resonant membrane gas sensor and non-transitory machine-readable storage medium therefore

A gas sensor, sensor technology, applied in tangible and non-transitory machine-readable storage medium, CO2 sensing field

Active Publication Date: 2017-08-18
希奥检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this means that at ambient conditions, 200ppm particles of CO 2 The change would result in a frequency change of 12ppm, which is close to the detection limit of this current device

Method used

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  • Resonant membrane gas sensor and non-transitory machine-readable storage medium therefore
  • Resonant membrane gas sensor and non-transitory machine-readable storage medium therefore
  • Resonant membrane gas sensor and non-transitory machine-readable storage medium therefore

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Embodiment Construction

[0072] In view of the above, it is hoped to realize a method for measuring CO in the air 2 means of content, which may not depend on any particular pressure, temperature or humidity. Only changes in the molar mass of the gas mixture are detected. In particular, it is desirable to create a method of separating desired signals from other environmental parameters.

[0073] As with any gas sensor, the measurement results will vary due to multiple influences such as gas pressure, temperature and relative humidity. These cross sensitivities can be mitigated to achieve approximately 200ppm ambient air CO 2 Detection of ppm level fluctuations.

[0074] Referring now to the drawings, in which like numerals indicate like components or steps, and in which there are disclosed broad aspects of various illustrative embodiments.

[0075] figure 1 Shows the difference between viscous laminar flow and free molecular flow with respect to the expected distance traveled by a molecule before hi...

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Abstract

A gas sensor (200) comprises a cavity (214) and is configured to sense at least one of a molar mass, a density and a viscosity of a gas mixture in the cavity (214). Moreover, various exemplary embodiments relate to a device to measure carbon dioxide (CO2) levels, including a first oscillator group (520) comprising a first sensor (250) to measure air pressure, where the first sensor (250) comprises a first sealed membrane (252), and where the first sealed membrane (252) overlays a sealed first cavity (258); a second oscillator group (522) including a second sensor (200) to measure the resonance frequency (f2) of a second unsealed oscillating membrane (210), and where the second unsealed membrane (210) overlays a second cavity (214) in contact with the air outside of the second sensor (200).

Description

technical field [0001] The present application relates to a gas sensor, a device including a gas sensor, a device for measuring carbon dioxide levels, and a tangible and non-transitory machine-readable storage having instructions encoded thereon for execution by the device to measure carbon dioxide levels medium. [0002] This application relates to cross-sensitivity mitigation of resonant CO 2 Sensing. Various exemplary embodiments disclosed herein generally relate to CO 2 Sensing. Background technique [0003] Electronic sensors can monitor air quality or gas composition in many ways; several physical properties of a gas mixture will change as the composition changes. For example, the sensor may be based on detecting the thermal conductivity of the gas mixture using a hot wire and measuring the heat dissipation from the wire to the environment. [0004] Specifically, CO 2 Sensing can work in many ways. Two current approaches include: A material-based approach in whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/02G01N29/036G01N29/24G01N33/00
CPCG01N29/022G01N29/036G01N29/2406G01N29/2431G01N33/004G01N2291/021G01N2291/0255G01N2291/0256G01N2291/02809G01N2291/02818G01L9/0016G01N33/0031Y02A50/20G01N29/222G01N29/323G01N29/4436
Inventor 卡斯珀·范·德·阿奥斯特威廉·弗雷德里克·亚德里亚内斯·贝什林
Owner 希奥检测有限公司
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