Method and apparatus for measuring single-sensor heat type gas flow

A thermal gas flow, single-sensor technology, used in measurement devices, liquid/fluid solid measurement, measurement flow/mass flow, etc., can solve the problems of affecting measurement accuracy, large measurement errors, and complicated circuits, so as to improve the measurement accuracy. Accuracy, simple structure, and the effect of reducing production costs

Inactive Publication Date: 2009-04-15
ZHEJIANG UNIV
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Problems solved by technology

Due to the nonlinearity of the temperature compensation resistor and the difference between the resistors, the circuit debugging process is more complicated, which affects the measurement accuracy to a certain extent.
Although a temperature compensation method based on a single se

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  • Method and apparatus for measuring single-sensor heat type gas flow
  • Method and apparatus for measuring single-sensor heat type gas flow
  • Method and apparatus for measuring single-sensor heat type gas flow

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Embodiment Construction

[0013] Further illustrate the present invention below in conjunction with accompanying drawing.

[0014] refer to figure 1 , a single-sensor thermal gas flow measurement device, including a sensor 1, an amplifier 2, a low-pass filter 3, a single-chip microcomputer 4, and a voltage controllable power supply circuit 5, which are composed of a resistor R and a platinum resistor PT20 connected to a voltage-dividing circuit. The output voltage signal v is connected to the input terminal of the low-pass filter 3 after being amplified by the amplifier 2, the output terminal of the low-pass filter 3 is connected to the AD sampling interface of the single-chip microcomputer 4, and the PWM port of the single-chip microcomputer 4 is connected to the voltage controllable power supply circuit 5 The input end of the sensor is connected, and the output end of the voltage controllable power supply circuit 5 is connected with the input end of the sensor 1.

[0015] figure 2 It is a specific...

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Abstract

The invention discloses a hot type gas flow measuring method of a single sensor and a device thereof. The device comprises a sensor, an amplifier, a low pass filter, a singlechip microcomputer and a voltage-controlled supply circuit, wherein, the sensor is composed of a divider circuit formed by connecting a resistance and a platinum resistance PT20. The invention has simple structure, the single platinum resistance PT20 is taken as the measuring element, and the gas flow is calculated by controlling the platinum resistance PT20 to work under the two different setting temperatures and measuring the output voltage of the platinum resistance under the two different setting temperatures. The measuring method and the device of the invention are adopted to measure the gas flow, which does not need to complement the resistance additionally, eliminates the influence of the gas temperature on the flow measurement, improves the measuring precision and reduces the production cost. Tests indicate that the measuring precision of the gas flow can reach 1% and the flow measuring range ratio is approximately 100:1 by adopting the method and the device of the invention.

Description

technical field [0001] The invention relates to a single-sensor thermal gas flow measurement method and a device thereof. Background technique [0002] The thermal gas flowmeter is a new type of gas flow detection instrument developed on the basis of the early hot wire anemometer. It has the advantages of low pressure loss, large flow range, high precision, no moving parts and low flow measurement. It has been widely used Used in aviation, aerospace, energy, medicine, automobile industry and natural gas pipeline transportation and other industries. Its basic principle is based on the convective heat transfer of the heated sensing element. When gas flows over the surface of the heating element, it will take away part of the heat, causing a change in the resistance value, which is related to the flow rate and temperature of the gas. At present, thermal gas flowmeters are divided into constant flow type and constant temperature type according to the circuit working mode of th...

Claims

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Application Information

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IPC IPC(8): G01F1/68G01F1/696
Inventor 赵伟国宋执环梁国伟黄震威杨松迎
Owner ZHEJIANG UNIV
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