A calibration method for humidity sensor in high humidity environment
A humidity sensor, temperature and humidity sensing technology, applied in the field of testing, can solve the problems that cannot meet the requirements, the humidity sensor has a small measurement range, etc.
Active Publication Date: 2020-08-25
BEIJING AEROSPACE YILIAN TECH DEV
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is that the measurement range of the existing humidity sensor itself is small and cannot meet the requirements
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[0025] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0026] refer to figure 1 , shows the hardware environment structure in the embodiment of the present invention. A heating film is installed in the constant temperature bath, and there is a PT100 feedback temperature probe and an air chamber under the heating film. The feedback temperature probe is used to monitor the temperature of the heating film. The outside of the constant temperature tank has a temperature control switch to control the heating temperature of the heating film, and a TDLAS host. In the embodiment, the calibration of the humidity sensor is performed by TDLAS, of course, it is also applicable to other types of sensors.
[0027] The TDLAS humidity sensor is divided into two parts, the TDLAS host and the air cham...
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The invention provides a calibration method used for a humidity sensor in a high-humidity environment. The method includes: a heating device and a feedback temperature probe are arranged above a water surface in a thermostatic bath, an electric control part of the humidity sensor is arranged outside the thermostatic bath, and a temperature and humidity sensing probe of the humidity sensor is arranged on the heating device; the heating device is controlled to be heated to multiple different temperature points with the set temperature of the thermostatic bath by employing the electric control part; a period is continued at each temperature until the water vapor around the temperature and humidity sensing probe is in a saturated vapor state and the feedback temperature and the display temperature of the humidity sensor are consistent; and the humidity sensor is calibrated according to a saturated water vapor absolute humidity value corresponding to the current temperature. According to the method, the humidity value in the high-humidity environment is simulated through the thermostatic bath, whether the system reaches the requirement is determined through heating and temperature feedback systems, and the calibration of the measuring range of the conventional humidity sensor is realized.
Description
technical field [0001] The invention relates to the technical field of testing, in particular to a calibration method for a humidity sensor in a high-humidity environment. Background technique [0002] Whether the gas discharge of petrochemical and electric power chimneys meets the national environmental protection standards requires accurate measurement of the water vapor content in the chimneys. Existing humidity sensors can be divided into dry and wet bulb method, weight gain method, humidity sensitive capacitive type, semiconductor type, dew point meter, infrared type and tunable semiconductor spectral absorption (TDLAS) according to the test principle. Environment: The existing humidity sensor is not suitable for the test environment of the chimney. [0003] The front-end sensing probes of TDLAS gas sensors are all optical devices, free from electromagnetic interference, narrow laser line width, and free from interference from other gases. It is the most suitable gas s...
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IPC IPC(8): G01D18/00
CPCG01D18/00
Inventor 高翔常洋李彦林孙菲
Owner BEIJING AEROSPACE YILIAN TECH DEV