Portable type near infrared mineralogical analyser

Abstract

The analyzer is composed of optical system, signal acquisition system and computer. Design of integrating sphere is utilized in the optical system of the analyzer. The procedure of the signal acquisition system is as follows. Incident light controlled by computer passes through optical modulator becomes varied light alternated intensity in high and low. Continuously, with being passed through grating spectrum analyzer, the light irradiates on a sample to be tested. Near infrared reflected back from the sample passing through the integrating sphere irradiates on a sensor so as to measure out the intensity of the light. Processing the measured intensity, computer obtains each component of sample measured and contents of each component. The portable analyzer can test rock and mine directly without need of specimen preparation. The measured data can be obtained in 70 second. Thus, it is suitable for use in field.

Description

Technical field: [0001] The invention relates to a raster-scanning near-infrared diffuse reflectance spectrum analysis instrument mainly used for mineral analysis in the field of geological survey. Background technique: [0002] An important task in the mining and geological survey industries is the analysis of mineral composition. Minerals in nature exist in the form of certain complexes. Through the detection of these complexes, the composition and content of minerals can be accurately analyzed. The commonly used analysis methods are chemical analysis, spectroscopic analysis and so on. X-ray diffraction and microprobe analysis are often used to further understand the subtle differences between minerals. Existing instruments for this type of analysis all have a common disadvantage of requiring complex processes for making test samples and expensive manufacturing equipment, and have the disadvantages of long analysis period, high cost, and low efficiency. With the develop...

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Problems solved by technology

Such as the Spectrumlab 400 instrument produced in China, the instrument is large in size and is not suitable for field testing; the "electric chopping light moisture analyzer" disclosed in CN 94101325.1 has a dual optical path structure and can only perform single-wavelength analysis, which cannot be realized in the field. Analysis of rock and ore components; ZL 96218361.X disclosed "Near Infrared Petroleum Composition Analyzer", which is designed based on the principle of transmission and cannot directly test solid minerals in the field

Although the PIMA (Portable Infrared Mineral Analyzer) instrument produced by Australia's Integrated Spectronics Pty Ltd can perform field mineral analysis, the interior of the instrument adopts a hemispherical crown design, and the sample port is designed on the side of the instrument. When the powder sample is placed horizontally on the side, the sample often The distribution is uneven, the test is inconvenient, the sensor needs to be refrigerated before the measurement, the test cost is high, the equipment is expensive, and it is difficult to maintain

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