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Method and device for measuring thermal conductivity, and gas component ratio measuring device

A measuring device and measuring method technology, applied in the direction of measuring device, analyzing material, thermal conductivity of materials, etc., can solve the problems of time-consuming, expensive, and complex structure of the analyzing device.

Inactive Publication Date: 2008-09-24
YAMATAKE HONEYWELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in such a method, there are also problems that it takes a lot of time to analyze the composition ratio of the mixed gas using the column, and the entire structure of the analysis device is complicated and expensive.

Method used

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  • Method and device for measuring thermal conductivity, and gas component ratio measuring device
  • Method and device for measuring thermal conductivity, and gas component ratio measuring device
  • Method and device for measuring thermal conductivity, and gas component ratio measuring device

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Embodiment Construction

[0030] Hereinafter, a thermal conductivity measurement method, a thermal conductivity measurement device, and a gas component ratio measurement device according to the present invention will be described with reference to the drawings.

[0031] The present invention is to use for example figure 1 The micro-heater 1 whose schematic configuration is shown basically measures the thermal conductivity of the atmospheric gas (pure gas or mixed gas) based on the calorific value of the above-mentioned micro-heater 1 . Micro-heater 1 is that for example thickness is 0.5mm, length and width dimension are the surface of silicon chip 1a of about 1.5mm respectively, forms concave chamber 1b, bridges on this chamber 1b simultaneously, forms the diaphragm 1c of thin film, A minute heating resistor (heater) 1d made of platinum or the like is provided on the diaphragm 1c. In addition, generally, a temperature sensor 1e for measuring the surrounding temperature is provided on the peripheral p...

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Abstract

A heat radiation coefficient C [=Ph / (Th-To)] from a microheater is calculated in accordance with a power Ph applied to the microheater which is supported in air and provided in an ambient gas, a heater temperature Th, and an ambient temperature To at this moment. Further, a thermal conductivity (lambdaT) of the ambient gas is obtained from the calculated heat radiation coefficient C based on a proportional relation [C=K (lambdaT) ] between a thermal conductivity (lambdaT) of the ambient gas and the heat radiation coefficient C at a measurement temperature lambdaT [=(Th-To) / 2].

Description

technical field [0001] The present invention relates to a thermal conductivity measuring method and device capable of simply measuring the thermal conductivity of a gas whose type is known but whose component ratio (composition ratio) is unclear, such as natural gas, and a gas component ratio using a thermal conductivity measuring device Measuring device. Background technique [0002] As a method of measuring the thermal conductivity of gas, there is known a method in which the heater is driven at a constant temperature while the atmospheric gas surrounding the heater is kept at a constant temperature, and the calorific value is measured. This method utilizes the proportional relationship between the calorific value of the heater and the thermal conductivity of the atmosphere gas. However, when this method is used to measure the thermal conductivity of the atmosphere gas, it is necessary to use a constant temperature bath or the like for keeping the above-mentioned atmosphe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/18
CPCG01N27/18G01N33/225G01N25/18
Inventor 大石安治青岛滋真行寺信义林靖江守尾周次
Owner YAMATAKE HONEYWELL CO LTD
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