Four-electrode testing device and measuring method for water content of tobacco

Abstract

The invention relates to a four-electrode testing device and a measuring method for the water content of tobacco. The water content of the tobacco is reflected by measuring the resistance of the tobacco through four electrodes as probes according to the specific function relationship between the resistance and the water content. The four-electrode testing device is formed in a way that a range selector is respectively connected with an electrode A, an electrode B, an electrode C and an electrode D through a singlechip computer and a resistance measuring circuit, and a PC (Personal Computer) is connected with a liquid crystal display circuit through a data uploading circuit and the singlechip computer. Compared with an infrared ray moisture meter, the four-electrode testing device disclosed by the invention has the characteristic that the measured result of the water content of the tobacco is prior to the precision and the efficiency of the infrared ray moisture meter. The influence from electrode polarization caused by measurement of single voltage through a pair of electrodes and the influence from offset voltage caused by measurement through single-direction power supply of the electrodes are overcome, so that the precision is increased; and the deviation of zone selection during measurement of a pair of electrodes is overcome, and thus the credibility of the measurement result is improved. A detection circuit is simple, the requirements on the color, shape and specification of the materials and light of a measurement environment are lower, the measurement result can be obtained more quickly and the water content inside the materials can be measured.

Description

Technical field: [0001] The invention relates to a device for detecting moisture content of dried and fresh plants, in particular to a four-electrode moisture testing device and a measuring method for measuring moisture content through resistance changes of dried and fresh plants. Background technique: [0002] Among the many existing moisture measurement methods, infrared light and microwave measurement are the two most important methods, and infrared technology is more widely and commonly used. At present, the online moisture meters used by most tobacco factories in my country are infrared moisture meters. Infrared moisture detection works according to the principle that genetic bonds such as OH and CH absorb specific wavelengths of infrared energy. The H-O complexes in water molecules are capable of absorbing several specific wavelengths of infrared light. According to this principle, the probe of the tobacco moisture meter is equipped with light sources that generate i...

AI Technical Summary

Problems solved by technology

Moreover, the disadvantage of the infrared moisture meter is that it only measures the surface moisture of the material, which puts high demands on the moisture uniformity of the material and calibration sampling.

In actual use, it can only be compensated by repeated sampling and calibration, which increases the workload and is not conducive to fast and convenient measurement

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