Method and system for raising gas concentration detection precision
A technology of gas concentration detection and gas concentration, which is applied in the field of medical devices, can solve problems such as circuit gain deviation, difficulty in achieving symmetry in circuit design, and circuit symmetry deviation, so as to improve detection accuracy, eliminate hardware circuit symmetry deterioration, Effect of reducing hardware design cost
Inactive Publication Date: 2016-12-21
深圳市怀睿科技有限公司
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Problems solved by technology
However, the actual situation is that the circuit design of the acquisition channel is difficult to achieve symmetry, and under different usage environments and usage times, there will be unpredictable deviations in the circuit gain of the two acquisition channels, which will lead to: Zero calibration, but due to the deviation of the circuit gain, the deviation of the acquired result will increase with the increase of the signal
Such circuit symmetry deviations can reduce the accuracy of gas concentration measurements
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[0044] In order to make the object, technical solution and advantages of the invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0045] Embodiments of the present invention provide a method for improving the detection accuracy of gas concentration, such as figure 1 shown, including steps:
[0046] S100, judging whether the preheating is completed;
[0047] Before sampling the light intensity infrared light signal, it is judged whether the system temperature reaches the predetermined temperature and is stable, that is, whether the preheating is completed, so as to obtain a stable system working temperature environment, and if the preheating is completed, enter the next step.
[0048] Step S200, switch the measurement gas path to the zero gas channel, that is, do not introduce the gas to be measured;
[0049] Switch the measurement gas path to the zero gas channel, the zero gas chan...
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The embodiment of the invention discloses a method and a system for raising gas concentration detection precision. The method of the invention comprises the following steps: sampling different light intensity infrared optical signals in a measurement channel and a reference channel and acquiring a compensating curve when measured gas is not introduced; introducing the measured gas, acquiring sampling values of the light intensity infrared optical signals in the measurement channel and the reference channel, calculating a difference value of the sampling values, and compensating the difference value according to the compensating curve; and inputting the compensated difference value to a gas concentration algorithm, and calculating gas concentration. By the symmetry compensation, the difficulty of hardware symmetry design is made up, and hardware circuit symmetry deterioration of the equipment due to time accumulation is also eliminated. Gas concentration detection precision is raised, and hardware design cost is also reduced.
Description
technical field [0001] The invention relates to the field of medical devices, in particular to a method and system for improving the detection accuracy of gas concentration. Background technique [0002] In the field of gas detection, especially gas detection technology in the field of medical devices, such as end-tidal carbon dioxide concentration and anesthetic gas concentration detection technology, the usual detection method is to use non-spectral infrared method to isolate the absorption characteristics of gas samples. The measurement principle is: a specific gas absorbs infrared energy of a specific wavelength, and the greater the gas concentration, the more it absorbs infrared light. The gas concentration measurement device designed by this non-spectral infrared method can be distinguished by a narrow-band filter. The gas type, the gas concentration is calculated by the attenuated light intensity; the photoelectric sensor is generally used to detect the attenuated lig...
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IPC IPC(8): G01N21/17
CPCG01N21/17
Inventor 周雄阳树和涂俊华
Owner 深圳市怀睿科技有限公司