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A gas measurement method, equipment and interfering gas compensation device

A gas measurement and gas technology, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems that the adsorbent cannot completely absorb interfering gases, high maintenance costs, and poor operability, etc., to achieve simplicity and cost, environmental concentration compensation, effect of low cost

Active Publication Date: 2017-07-18
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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Problems solved by technology

However, this method has the following problems: 1. Different gases require different adsorbents. When measuring multiple gases, multiple adsorbents need to be connected externally, and the operability is not strong; 2. The adsorbents have a certain service life. , it needs to be replaced regularly, and the maintenance cost is high; 3. In large flow applications, the adsorbent cannot completely absorb the interfering gases in the atmosphere

Method used

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  • A gas measurement method, equipment and interfering gas compensation device
  • A gas measurement method, equipment and interfering gas compensation device
  • A gas measurement method, equipment and interfering gas compensation device

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Embodiment 1

[0028] Please refer to figure 1 In one embodiment, the gas measurement device 100 includes a reference channel 110 , a measurement channel 120 , a gas measurement module 130 and an interference gas compensation device 140 . The reference channel 110 is used to output electrical signals through air or gas to be measured. Since the reference channel is selected as a specific wavelength independent of the absorption wavelength of all gases, it has no absorption on the measurement gas, and the output electrical signal is a constant value, which does not change with the type and type of the gas to be measured; the measurement channel 120 is used to pass air or Measured gas, output electrical signal. Since the measurement channel is selected as the wavelength absorbed by a specific gas, for example, a filter with a specific wavelength is used to pass the wavelength that can be absorbed by the gas to be measured, and the light of this wavelength only absorbs the specific measurement...

Embodiment 2

[0043] When the zero-calibration operation occurs, the optimal environmental concentration characteristic value may be refreshed, that is, the compensation value is changed. There may be a large gap between the new compensation value and the original compensation value. The subsequent preliminary measurement results of the measured gas use There may be a jump after the compensation calculation of the new compensation value, so that the curve of the measured gas also has an abnormal jump. In this embodiment, the measurement result smoothing unit 144 is added to eliminate the abnormal jump.

[0044] like Figure 4 As shown, the gas measurement device 200 includes a reference channel 210 , a measurement channel 220 , a gas measurement module 230 and an interference gas compensation device 240 . The interference gas compensation device 240 includes a zero calibration operation unit 241 , a compensation value determination unit 242 , a measurement result compensation calculation un...

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Abstract

A gas measurement method, comprising: during the measurement of the measured gas, extracting gas by a preset rule to conduct zero calibration measurement, and recording the zero calibration measurement result; determining a compensation value for the present measurement period according to historic zero calibration measurement results meeting a set conditions, extracting the measured gas for measurement, and obtaining the preliminary measurement result of the measured gas within the present measurement period; utilizing the compensation value of the present measurement period to compensate the measured preliminary measurement result of the measured gas, and obtaining the compensated measurement result of the measured gas. The present method compensates the interfering gas not by using an adsorbent but by obtaining a point least influenced by environmental interfering gas, and utilizing the point to calculate the concentration for compensation, thus reducing the influence of the environmental interfering gas on the measurement result of the measured gas.

Description

technical field [0001] The invention relates to gas measurement and analysis, in particular to a gas measurement method, equipment and an interference gas compensation device for processing interference gas. Background technique [0002] The gas measurement technology based on Non-Dispersive Infrared Spectroscopy (NDIR, Non-Dispersive Infrared) needs a reference point during measurement to eliminate the system drift error. Usually, the gas concentration in the atmosphere containing the same type of gas to be measured is Zero reference point to correct or compensate the measurement results of the gas to be measured. However, the gas composition contained in the atmosphere may change due to the influence of the environment. For example, the concentration of a certain gas contained in the atmosphere increases. When the gas with the same composition of the measured gas in the atmosphere increases, it will cause a deviation of the zero calibration reference point. It leads to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504G01N21/01
CPCG01N21/3504
Inventor 岑建刘中华涂有强周赛新左鹏飞
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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