Method and device for detecting humidity of tail gas of knitted fabric boarding machine

Abstract

The invention provides a device and method for detecting the humidity of the tail gas of a knitted fabric boarding machine, and the method comprises the steps of coating a grating region of an optical fiber Bragg grating with modified fluorine-containing polyimide to prepare a humidity sensor; calibrating the humidity sensor by using a saturated salt solution humidity calibration method, and enabling the central wavelength value of the optical fiber Bragg grating to correspond to the humidity value; performing temperature compensation on the fiber Bragg grating humidity sensor, obtaining a temperature compensation coefficient through a segmented calibration method, and obtaining a relation between the variation of the central wavelength of the sensor and the variation of the external environment temperature; obtaining the central wavelength drift distance of the optical fiber Bragg grating caused by temperature change through a linear interpolation method, compensating the central wavelength of the optical fiber Bragg grating, and carrying out inversion calculation on the humidity, so that the problems that in the prior art, a sensing probe based on zirconium dioxide needs to be replaced regularly, the maintenance difficulty is large, the cost is high, and a fiber Bragg grating humidity sensor is sensitive to temperature and humidity in a cross mode, are solved.

Description

technical field [0001] The invention relates to the field of parameter detection of a setting machine, in particular to a method and a device for detecting the humidity of the tail gas of a fabric setting machine. Background technique [0002] The fabric setting machine is a device that uses hot air to dry, arrange and shape the fabric. During the drying process, the humidity requirement is very high, and humidity is an important factor affecting the fabric setting effect. The exhaust temperature of the knitted fabric setting machine can be as high as 90°C. It is difficult for the common resistance humidity detection device in daily life to work normally in this temperature range, so it is very difficult to accurately detect the humidity in this industrial environment. of. [0003] Now industrial production mainly relies on skilled workers to estimate the drying process based on their experience. However, this method is not only highly subjective, but also may appear "over-...

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Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, aiming at the above-mentioned problems, the present invention discloses a method and device for detecting the humidity of the tail gas of a fabric setting machine, which solves the problems in the prior art where manual estimation is highly subjective and the product quality is unstable. Zirconium dioxide used as a sensing probe needs to be replaced every three years and the detection accuracy is low, the maintenance is difficult and the maintenance cost is high, and the fiber Bragg grating humidity sensor is sensitive to temperature and humidity.

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