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Resonant acoustic gas sensor

A gas sensor, gas technology, used in instruments, scientific instruments, and the use of sonic/ultrasonic/infrasonic waves to analyze fluids, etc., and can solve problems such as inaccessibility to power sources

Inactive Publication Date: 2018-09-28
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these systems, sensors may be placed in locations that are only accessed occasionally by maintenance personnel, and locations that may be difficult to access to power
As a result, sensors may need to rely on battery power for extended periods of operation, or utilize limited power harvesting capabilities

Method used

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  • Resonant acoustic gas sensor
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Embodiment Construction

[0012] Acoustic gas sensors typically measure the composition of a gas based on its effect on the velocity of sound through that medium. Sensors can be calibrated to measure the concentration of selected gases in a mixture, such as the concentration of methane in air.

[0013] figure 1 An exemplary embodiment of an acoustic sensor featuring separate transducers and receivers is depicted in . Microcontroller 100 drives oscillator 102 to generate a particular frequency at transmitter 104 . Acoustic waves generated by transmitter 104 travel through measurement chamber 106 to receiver 108 which outputs a voltage signal which is amplified at 110 and filtered by a bandpass filter and run through integration and peak detection circuit 112 . The integration and peak detection circuit is connected to an analog-to-digital converter 114 which detects the analog signal at the integration and peak detection circuit 112 and converts the analog signal into a digital signal which is provide...

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Abstract

Resonant acoustic gas sensors and methods for operating acoustic gas sensors that improve detection and reduce power consumption through the use of dynamic thresholds for identifying resonance peaks and optimizing searching for subsequent resonance peaks. The resonant acoustic gas sensors may use one or two separate transducers to produce the electronic signal that is filtered and used to identifythe resonance peaks, using either voltage or impedance values to identify resonance peaks and use the resonance peaks to determine the composition of the gas mixture being measured.

Description

Background technique [0001] The detection of explosive gases is an important safety component in the mining, oil and gas industries, and commercial, residential and industrial environments powered by natural gas. Natural gas, as supplied by utilities, is typically >95% methane, so nearly all commercial detectors are designed to sense this compound and measure its concentration in air. Of particular concern is the explosive concentration range of 5-15%. Sensing techniques based on these sensors include mid-infrared spectroscopy, thermal conductivity, electrical resistance of thick-film semiconductors, heat from catalytic oxidation, and electrical current from flame ionization. Each of these sensors has limitations in terms of concentration range covered, accuracy, selectivity, power required, ease of operation, calibration, robustness, lifetime, and / or cost. [0002] Some types of acoustic sensors have been used in the natural gas industry. Many of these sensors are based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/036G01N29/42G01N29/44
CPCG01N29/42G01N29/348G01N29/4454G01N2291/021G01N29/036G01N29/222G01N29/4427G01N2291/102G01N2291/105
Inventor 斯蒂芬·J·威利特埃里克·A·阿霍埃里克·J·阿尔菲特本杰明·P·黑普纳理查德·L·吕兰德本杰明·K·斯泰因丹尼尔·A·坦普尔
Owner 3M INNOVATIVE PROPERTIES CO