Multi-functional ultraviolet-visible spectrometer

A spectrometer and multifunctional technology, applied in the field of multifunctional ultraviolet-visible spectrometer, can solve the problems of incomplete information, uneconomical cost, uneconomical space occupied by instruments and equipment, etc.

Inactive Publication Date: 2011-03-30
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, fluorescence spectrometer is also an important means of analysis and testing, but due to the need for monochromatic light excitation and a highly sensitive photon detector, commercial fluorescence spectrometers are not combined with transmission (absorption) spectrometers, and is stand-alone as a test device
This is not only uneconomical in terms of equipment cost, but also uneconomical in terms of the space occupied by the equipment. More importantly, the information obtained from a single-function spectrometer is often incomplete.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Transmission Spectrum

[0036] figure 2 For the transmission spectrum T of the GaN thin film grown on the sapphire substrate by MOCVD method, the angle A of the sample stage angler during measurement is A=α=45 degrees, and the angle of the fiber angler B=0 degree, that is, the incident light is normal after passing through the sample. Incident into the optical fiber, the diameter of the light-limiting pinhole is 0.5mm. From figure 2 It can be seen that the transmission intensity oscillation caused by GaN thin film interference effect is obvious. Since the CCD spectrometer collects data of all wavelengths synchronously, the data collection is very fast, and the full-spectrum measurement time is only 0.1 second.

Embodiment 2

[0037] Example 2: Reflectance Spectrum

[0038] Using the same sample as in Example 1, and keeping other experimental parameters unchanged, only changing the angle of the fiber angle B to β=45 degrees, that is, B=α+β=45+45=90 degrees, at this time the fiber entrance is located at the incident in the direction of reflection of the beam. The measured reflectance spectrum R as image 3 shown. In the visible reflection spectrum, there are also obvious reflection intensity oscillations caused by the interference effect of GaN thin films. Careful observation shows that the maximum value in the transmission spectrum corresponds exactly to the minimum value in the reflection spectrum. Likewise, the minima in the transmission spectrum correspond exactly to the minima in the reflection spectrum.

Embodiment 3

[0039] Embodiment 3: absorption spectrum

[0040] The general UV-spectrometer can be converted from the transmission spectrum T to obtain the absorption spectrum A through the formula A=1-T, ignoring the influence of the intensity oscillation caused by the reflection R of the sample surface and the interference of the thin film. In the multifunctional spectrometer we invented, since both the transmission spectrum and the reflection spectrum can be measured, the conversion formula becomes A=1-T-R. Utilizing the principle that the intensity oscillations caused by interference in the intensity of transmission spectrum and reflection spectrum are complementary, the intensity oscillations caused by interference can be eliminated to a large extent. Figure 4 for the reason figure 2 The transmission spectra shown for T and image 3 The data shown for the reflectance spectrum R results in an absorption spectrum A=1-T-R. For comparison, the figure also shows the absorption spectrum...

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Abstract

The invention discloses a multi-functional ultraviolet-visible spectrometer, which comprises an ultraviolet-visible light source, a fixed convex lens, an adjustable diaphragm, a movable convex lens, a turning apparatus, a charge coupled device (CCD) miniature spectrometer and a microcomputer. The multi-functional ultraviolet-visible spectrometer of the invention has a reflectance spectrum test function, a transmittance spectrum test function, an absorption spectrum test function, a scattered spectrum test function and a fluorescence spectrum test function, and can measure variations of the spectrum and the spectral intensity with angles through rotation of a sample table turning apparatus and a light-guide fibre turning apparatus, thereby obtaining a reflectance spectrum, a transmittance spectrum, a absorption spectrum, a scattered spectrum and a fluorescence spectrum which have angle resolution capability.

Description

technical field [0001] The invention relates to a spectrum analysis testing device, in particular to a multifunctional ultraviolet-visible spectrometer. Background technique [0002] Transmission spectroscopy, reflection spectroscopy, absorption spectroscopy, and scattering spectroscopy are widely used analytical and testing methods, which can be widely used in many fields, such as materials, physics, chemistry, electronics, environmental testing, biochemistry, medicine, etc. The structures of these spectrometers are basically composed of an ultraviolet-visible light source and a spectroscopic light receiver, and have a lot in common in terms of hardware. However, most of these spectrometers currently exist in the form of single-function or dual-function spectrometers. For example, without considering the reflection of the sample surface, the transmission spectrometer (T) and the absorption spectrometer (A) are often integrated into one spectrometer, that is, the absorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01J3/28G01J3/42G01J3/44
Inventor 季振国
Owner HANGZHOU DIANZI UNIV
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