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Reduction of temperature influence caused by pressure of sound velocity in gas

A technology for gases and gas mixtures used in material analysis, measuring devices, instruments, etc. using sonic/ultrasonic/infrasonic waves

Active Publication Date: 2013-06-05
MAQUET CRITICAL CARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This prior art addresses the problem of minimizing standing acoustic waves in the measurement chamber

Method used

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  • Reduction of temperature influence caused by pressure of sound velocity in gas
  • Reduction of temperature influence caused by pressure of sound velocity in gas
  • Reduction of temperature influence caused by pressure of sound velocity in gas

Examples

Experimental program
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Embodiment Construction

[0073] Measuring chamber

[0074] In a preferred embodiment, the invention is realized by means of a measuring chamber for temporarily containing the gas to be measured. Preferably, the chamber is mounted such that a gas flow passes through the chamber and measurement sampling is intermittently performed on the flowing gas. A functional requirement for the measuring chamber is that the chamber-defining substance should act as a thermal buffer and have an efficient heat exchange with the gas molecules. The higher the achieved heat exchange efficiency, the more the speed of the temperature equilibration process increases and the better the effect of the invention.

[0075] figure 1 A measuring device 1 according to the invention is shown schematically. The measuring chamber 2 defined by the chamber-defining structure 5 has a cavity 4 with a space of gas in which ultrasonic waves propagate from the ultrasonic transmitter to the ultrasonic receiver. exist figure 1 In the ...

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Abstract

The invention discloses equipment for determining the proportion of gas in a gas mixture, comprising a measuring chamber, an ultrasonic wave source and an ultrasonic wave detector and a temperature sensor. The measuring chamber is provided with a chamber limiting structure containing a high heat conduction material, a gas inlet and a gas outlet, wherein the material is metal; the ultrasonic wave source and the ultrasonic wave detector are mounted to enable the ultrasonic wave source to transmit the ultrasonic wave to the ultrasonic wave detector through the measuring chamber; and the temperature sensor is mounted to enable the sensor to sense the temperature in the measuring chamber, wherein the measuring chamber has a tubular cavity with a radius r0 of 1-8mm so as the make the distance between gas in the measuring chamber and an inner wall of a tube, and the measuring chamber is designed so as to make the gas to be measured to tightly contact a rigid surface of an object with thermal inertia and good heat conduction, thus the heat can free move to a surrounding structure from the gas.

Description

[0001] This patent application is a divisional application of the invention patent application with the international filing date of June 17, 2005 and the national application number of 200580050144.7 entitled "Reduction of temperature influence induced by pressure on sound velocity in gas". technical field [0002] The present invention generally relates to the measurement of the speed of sound in gas mixtures. More specifically, the invention relates to the application of ultrasonic detectors, for example, to the measurement of gas concentrations or gas flows in environments where pressure-induced temperature influences are a dominant factor in the accuracy of the measurements. Background technique [0003] In some applications of ultrasonic testing, such as measuring the concentration or ratio of gas components in a gas mixture, the pressure change of the gas mixture has a great influence on the measurement accuracy. There is a well-known relationship between sound veloci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/024G01N29/32G01N29/22
Inventor 埃里克·卡尔德柳斯
Owner MAQUET CRITICAL CARE
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