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Near infrared quantitative water content measurement method for paper

A paper quantification and measurement method technology, which is applied in the directions of measuring devices, color/spectral characteristic measurement, and analysis materials, etc., can solve problems such as the inability to realize integrated online measurement of paper quantitative moisture, and achieve enhanced adaptability, strong anti-interference, and high precision effect

Active Publication Date: 2009-06-17
西安力源光电科技有限责任公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a near-infrared paper quantitative moisture measuring instrument, which solves the technical problem in the background technology that the integrated online measurement of paper quantitative moisture cannot be realized only for the measurement of a single quantity

Method used

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Embodiment Construction

[0034] According to the physical characteristics such as the inhomogeneity of the paper and the anisotropic divergence of the interwoven fibers to the light, the present invention selects a large-area measurement spot, and the optical signal is modulated so that the instrument can detect the physical state changes of the paper and the The impact of fluctuations and external light is not sensitive, so that the present invention has strong adaptability.

[0035] The present invention uses the absorption characteristics of paper components to near-infrared light to find out the selective absorption characteristics of each component to near-infrared spectrum, and filters out five or more beams of near-infrared monochromatic light from infrared spectrum through color filtering and spectroscopic technology. The transmissive device, and the correction function is used to overcome the additional error, and the single-chip microcomputer system is used for data processing, so as to reali...

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Abstract

The quantitative moisture measurement method for near infrared paper comprises: modulating the infrared light into near infrared lights with different wavelength and arranged as chronological order to reflect with a reflector to the emission integral semisphere to reflect and cross the paper to focus on a optical-electrical converter, sending the converted electric signal to microprocessor for pretreatment; then, transmitting into a data centralized processing unit to recognize and divide into reference signal with one path to control front amplifier and another path as the reference signal and measurement signal; calculating in the processing unit to obtain quantitative moisture content. This invention realizes online measurement with high accuracy and low cost.

Description

technical field [0001] The invention relates to a near-infrared measurement method for quantitative moisture of paper, in particular to a near-infrared measurement method for quantitative moisture of paper. Background technique [0002] At present, there is no report in China that uses near-infrared rays to measure the quantitative moisture content of paper. In foreign countries, infrared rays are used to measure paper, but the method is only for the measurement of a single quantity. Although the measurement of fiber and moisture of paper can be realized by two or even multiple devices, the quantitative measurement of complex components in paper cannot be realized, so the online integrated measurement of quantitative moisture of paper cannot be realized. At present, the β-ray technology is generally used for the measurement of paper weight at home and abroad. In the detection process of the paper production line: the moisture content is measured with a near-infrared moistur...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/27G01N21/17
Inventor 李卫国
Owner 西安力源光电科技有限责任公司
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