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 space occupied by instruments and equipment, and uneconomical cost.
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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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