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High-precision micro-water sensor zero drift correction method and storage device

A micro-water sensor and zero-point drift technology, which is applied to instruments, scientific instruments, and measuring devices, can solve problems such as unreliable zero-point calibration results, reduce procurement cycles and costs, and avoid unreliable effects

Pending Publication Date: 2021-10-08
福州亿得隆电气技术有限公司
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Problems solved by technology

[0004] Therefore, it is necessary to provide a high-precision micro-water sensor zero drift correction method. In the existing micro-water density sensor, the humidity sensor will drift with the temperature, which will easily cause the problem of unreliable zero point calibration results.

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  • High-precision micro-water sensor zero drift correction method and storage device

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Embodiment Construction

[0032] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

[0033] Such as Figure 1-2 As shown, in the DRYCAP calibration technology of Vaisala, Finland, the DRYCAP probe includes a polymer humidity-sensitive film capacitor and a thermistor. The capacitance value is proportional to the humidity value. The thermistor is used to heat the humidity-sensitive capacitor and record the cooling process. temperature value in . During the heating and cooling process, two sets of temperature values ​​T1 and T2 were recorded, and two sets of humidity values ​​RH1 and RH2 were recorded at the corresponding temperature, and Rh was the zero point drift of humidity.

[0034] According to the GO-ff-Gratch and Wexler correction formula, the saturated water vapor pressure (Pws) at temperature T can be obtained...

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Abstract

The invention relates to a high-precision micro-water sensor zero drift correction method and a storage medium. The method comprises the following steps: obtaining a current first temperature value and a current first humidity value through a thermistor and a humidity-dependent sensor; heating the humidity-sensitive sensor for the first time, and obtaining a second temperature value and a second humidity value through the thermistor and the humidity-sensitive resistor; heating the humidity-dependent sensor for the second time, and obtaining a third temperature value and a third humidity value through the thermistor and the humidity-dependent sensor; according to the obtained first temperature value, the first humidity value, the second temperature value, the second humidity value, the third temperature value and the third humidity value, calculating a temperature drift coefficient through a temperature drift compensation formula; and substituting the calculated temperature drift coefficient into a DRYCAP calibration technology of Vaisala, and calculating a humidity zero point value. The problem of unreliability of measurement data is avoided, expensive sensors are not needed, and the purchase cycle and cost are reduced.

Description

technical field [0001] The invention relates to the technical field of micro-water density detection, in particular to a zero-point drift correction method of a high-precision micro-water sensor and a storage device. Background technique [0002] Moisture density sensors are used to measure the trace moisture content of gases, using capacitive humidity sensors. In the existing micro-water density measurement, such as the DRYCAP calibration technology of Vaisala in Finland, a single thermistor is used to heat the humidity sensor close to it, and after the heating is completed, the thermistor is used to measure the temperature value during the cooling process change, and record the humidity value corresponding to the humidity sensor to realize the zero point correction function of the humidity sensor. Therefore, the problem of zero point drift and unreliable measurement data of the sensor after long-term work is overcome. [0003] However, existing calibration techniques req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/223
Inventor 蓝毅蓝程高彬
Owner 福州亿得隆电气技术有限公司
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