Near-infrared moisture measurement instrument

Abstract

The invention provides a near-infrared moisture measurement instrument which comprises an LED array (10), an optical system, an InGaAs detector (30) and a controller circuit. The controller circuit is connected with the LED array (10) and the InGaAs detector (30), after light emitted by the LED array (10) irradiates a sample (100) to be measured through the optical system, the scattered light is gathered on the expanded InGaAs detector, and the expanded InGaAs detector (30) transmits a signal obtained through detection to the controller circuit. The near-infrared moisture measurement instrument has the advantages that no mechanical motion parts are needed, structure complexity and system maintenance times are reduced, reliability is improved, the size of the equipment is reduced, speed measurement of a system is not limited by mechanical rotation speed any more, and millisecond-grade measurement can be achieved.

Description

technical field [0001] The invention relates to a moisture measuring instrument, in particular to a near-infrared moisture measuring instrument. Background technique [0002] Near-infrared (NIR) moisture meter is used in the fields of metallurgy, tobacco, food, wood, paper processing, building materials, chemical industry, mining, pharmaceutical and energy to measure the moisture content of materials and other necessary components. [0003] Near-infrared moisture measurement utilizes the principle that water has strong absorption characteristics for near-infrared light of several wavelengths (1.19um, 1.45um, 1.94um, 2.95um). Among these absorption peaks, the absorption rate at 1.19um wavelength is small, and it is generally used for humidity measurement greater than 50%, which is not ideal for the measurement of micro-moisture content; the absorption rate at 2.95um wavelength is too large, and the measurement range is narrow. Generally used for small-scale high-precision me...

AI Technical Summary

Problems solved by technology

[0031] 2) Difficult to achieve multi-wavelength fast measurement

[0034] 3) Weak anti-interference ability

The background noise in the measurement environment, the electronic noise of the circuit, and the temperature drift will affect the measurement results.

Although the traditional PbS detector has a good peak response in the 1.94um moisture-sensitive absorption band, the PbS detector has a long integration time and is very sensitive to temperature changes. Generally, it needs to be equipped with a refrigeration device, which also limits the performance of PbS-based detectors. Moisture meter measurement speed increased and volume reduced

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