Online near-infrared moisture meter

Abstract

The invention discloses an online near-infrared moisture meter, and belongs to the technical field of near-infrared spectroscopy. The online near-infrared moisture meter comprises a reflection detection module and a filter disc module, the reflection detection module comprises a lead sulfide detector and a sampling circuit for processing near-infrared light signals detected by the lead sulfide detector, the sampling circuit comprises a signal amplification circuit, a gain adjustment circuit, a signal detection circuit, an AD analog-to-digital conversion circuit and a sampling MCU, and an ROM built in the sampling MCU receives the n voltage signals converted by the AD analog-to-digital conversion circuit and calculates a water outlet score according to the n voltage signals. According to the online near-infrared moisture meter disclosed by the invention, the circuit is optimized, the problems that a multi-stage amplification circuit is easily interfered and near-infrared light signals have time delay are avoided, different wavelength signal values can be directly analyzed and operated, a positioning hole and a photoelectric fixer do not need to be arranged, and the structure is simplified.

Description

technical field [0001] The invention relates to the technical field of near-infrared spectroscopy, in particular to an online near-infrared moisture meter. Background technique [0002] Online near-infrared moisture meter refers to the use of near-infrared spectrum analysis method to detect the change of near-infrared spectrum in a specific wavelength range to measure the moisture content. From the point of view of use, it is mainly used in papermaking, metallurgy, chemical industry, food and other production lines Real-time monitoring of moisture content of materials, etc. [0003] At present, in principle, the online near-infrared moisture meter can use a combination of various filters, such as a filter disc or optical fiber LEDs with different wavelengths. In practical applications, many LEDs with special wavelengths have not been put into industrial production, and the cost is high. It is also difficult to choose suitable fiber optic LEDs with multiple wavelengths; at p...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the technical problem to be solved by the present invention is to propose an online near-infrared moisture meter to optimize the circuit and avoid the problems that the multi-stage amplifier circuit is susceptible to interference and the near-infrared light signal has a delay. And it can directly analyze and calculate the signal values ​​of different wavelengths, without setting positioning holes and photoelectric stabilizers, simplifying the structure

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