Spectral measurement method based on LED light source

A technology of LED light source and spectrum measurement, which is applied in the field of spectrum measurement, can solve problems such as difficulty in adapting to real-time measurement, and achieve the effect of compact structure, high reliability, low volume, and small volume

Inactive Publication Date: 2004-12-22
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Although this method can measure the reflectance spectrum of the measured substance, it is suitable for laboratory measurement due to the limitations of precision spectroscopic elements and the non-solid light source used (volume, life, light source stability, energy consumption and heat dissipation, etc.). , but it is difficult to adapt to the requirements of online real-time measurement in industrial processes

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  • Spectral measurement method based on LED light source
  • Spectral measurement method based on LED light source

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Embodiment Construction

[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0011] Pulp refers to a suspension of plant fibers in water. Many properties of pulp can be measured by its reflectance spectra in the visible and near-infrared bands. Such as pulp hardness (Kappa value), residual lignin content, brightness, residual ink content and moisture content, etc. The usual measurement method is to use a reflection spectrometer to measure the dry pulp. Many commercial standard brightness meters can be used for this measurement, but it is only suitable for laboratory measurement, and cannot adapt to the task of online real-time measurement in industrial processes. .

[0012] In the visible light-near-infrared spectrum range, the reflection spectrum of pulp has no obvious characteristic absorption peaks, and the resolution of light wave wavelengths is not strict in practical applications (according to the ISO method, t...

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Abstract

Characters of the method are: monochromatic light needed in measurement is obtained by adopting LEDs possessing different centered wavelengths; measuring device includes measuring light intensity and referencing light intensity generated from wide spectrum photosensors having same characteristics of spectral response; at different moment, driving different LEDs obtains values of spectral response corresponding to relevant central wavelength in order to obtain spectrum response curve further. The invention is applicable to measuring situation: inexact requirement on wavelength resolution; not need of measurement in continuous wavelength; characters of object to be measured are not changed or changed slowly, suitable to production in industrialization scale.

Description

technical field [0001] The invention relates to the technical field of spectrum measurement, in particular to a spectrum measurement method based on an LED light source. Background technique [0002] Measuring the visible light-near-infrared spectrum of a substance is an important means for measuring the properties of a substance and for quantitative and qualitative analysis. According to the form of interaction between the beam and the material and the structure of the optical path, it can be divided into transmission type, reflection type, scattering type, etc. Conventional spectrometers are usually post-split design, that is, a continuous light source (halogen lamp or pulsed xenon lamp) is used to irradiate the sample, and a monochromator is set in the receiving optical path. For example, a grating is used as a spectroscopic element, and a photodiode array is used as a receiving element. Although this method can measure the reflectance spectrum of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28
Inventor 阎东波刘焕彬
Owner SOUTH CHINA UNIV OF TECH
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