Measuring method and sensor for secondary differential flow of up-stream and down-stream temperature distribution and use

A technology of temperature distribution and measurement method, applied in the field of secondary differential gas mass flow measurement, sensor, and flowmeter based on upstream and downstream temperature distribution, which can solve the problem of insensitivity in low-speed section, low measurement accuracy, easy to cause errors, etc. problem, to achieve the effect of improving the scope of the flow test

Inactive Publication Date: 2007-10-10
MEMSIC SEMICON WUXI
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  • Abstract
  • Description
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Problems solved by technology

[0008] Another purpose of the present invention is to solve the technical problems in the prior art that the measurement accuracy is not high, it is easy to cause errors, and it is not sensitive to low-speed sections; it pr

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  • Measuring method and sensor for secondary differential flow of up-stream and down-stream temperature distribution and use
  • Measuring method and sensor for secondary differential flow of up-stream and down-stream temperature distribution and use
  • Measuring method and sensor for secondary differential flow of up-stream and down-stream temperature distribution and use

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Embodiment

[0055] The secondary differential gas mass flow measurement method based on upstream and downstream temperature distribution is characterized in that: a. A constant power source excitation 3 is applied to the heating element 1 of the sensor, and the temperature detection elements symmetrically arranged on both sides of the heating element are respectively Measure the temperature distribution of the upstream and downstream of the heating element in the state of no air flow; b. When the gas flows through the sensor, the upstream temperature detection element 2u measures the temperature distribution change in the area and outputs an upstream temperature difference signal, and the downstream temperature detection element 2d measures the temperature distribution in the area The regional temperature distribution changes and the output generates a downstream temperature difference signal; c. Subtract the downstream temperature difference signal from the upstream temperature difference ...

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Abstract

A measurement transducer of secondary differential flow rate based on up-down stream temperature distribution is prepared for connecting heating element to constant power source excitation, connecting up-stream temperature detection element and down-stream temperature detection element separately to two signal input ends of differential operation circuit and connecting output end of said differential operation circuit to central processing unit.

Description

technical field [0001] The invention relates to the field of mass flow detection, in particular to a secondary differential gas mass flow measurement method based on upstream and downstream temperature distribution, a sensor, and a flowmeter. The invention can be widely used in industries such as automobile engine flowmeters, air leakage protectors, natural gas metering flowmeters, industrial control flowmeters and transmitters, anemometers, household all-electronic gas meters, and medical instruments. Background technique [0002] Thermal gas mass flow measurement is a technology that uses the principle of heat transfer, that is, the heat exchange relationship between the flowing fluid and the heated object in the heat source fluid or the heating body outside the measurement tube to measure the flow rate. It is mainly divided into two types: anemometer and calorimetric. The working principle of the anemometer is based on the King's Law theory proposed in 1914. This measure...

Claims

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Application Information

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IPC IPC(8): G01F1/76
Inventor 毛巨林赵文宏涂相征
Owner MEMSIC SEMICON WUXI
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