A paper quantitative sensor with adjustable ray intensity and its control method

Abstract

The invention discloses a ray-intensity-adjustable quantitative paper sensor and a control method thereof. The ray-intensity-adjustable quantitative paper sensor comprises a scanning rack as well as an upper head box and a lower head box which are arranged on the scanning rack and are aligned to each other vertically, wherein an ionization chamber is formed in the upper head box; a radiation chamber is formed in the lower head box; a radiation source is arranged inside the radiation chamber; an adjustable shutter is arranged at the upper part of the radiation chamber; rays emitted from the radiation source can penetrates through the adjustable shutter to reach the ionization chamber; a shutter control device which is capable of controlling the opening degree of the adjustable shutter and capable of locking the adjustable shutter is connected between the ionization chamber and the adjustable shutter. When the ray-intensity-adjustable quantitative paper sensor is used for measuring different paper grades and the radiation energy degradation, the opening degree of the shutter can be adjusted in a stepless manner according to required voltage, the intensity of beta-ray is continuously adjusted, the problems that the sensitivity and the measurement precision of a conventional quantitative sensor are reduced when the gram weight of paper is increased and the energy of the radiation source is degraded are solved, and the detection precision is high.

Description

technical field [0001] The invention belongs to the technical field of paper quantitative measurement, in particular to a paper quantitative sensor with adjustable ray intensity and a control method thereof. Background technique [0002] Paper quantitative online detection usually uses β-rays to penetrate the paper. The higher the paper weight, the stronger the radiation absorption ability. The energy attenuation of the radiation after penetrating the paper conforms to Bell Quantitative. The ionization chamber is used to detect the radiation energy and convert it into a voltage signal. After calculation Get paper basis weight data. Quantitative sensors at home and abroad are usually composed of a radioactive source, a shutter mechanism, a shutter control mechanism, an ionization chamber, and a signal amplification circuit. The β-rays emitted from the shutter mechanism penetrate the paper and enter the ionization chamber, causing the ionization of the inert gas in the ioniza...

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Problems solved by technology

[0003] In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a paper quantification sensor with adjustable radiation intensity and its control method. The problem of decreased sensitivity and measurement accuracy caused by the increase in gram weight and the energy attenuation of radioactive sources, and the detection accuracy is high

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