Ultraviolet and visible spectrophotometer

Abstract

The invention provides an ultraviolet and visible spectrophotometer which comprises a light source, a lens, an optical fiber, a collimating mirror, a shading cap, an integrating sphere and a spectrometer. The light emitting wavelength of the light source is within the range of 200 nm to 1000 nm. The light emitted by the light source passes through the lens and then enters from one end of the optical fiber, the other end of the optical fiber is provided with the collimating mirror, the shading cap is arranged between the collimating mirror and a sample to be detected, the light is transmitted by the optical fiber and then is emitted from the collimating mirror in parallel and enters the sample to be detected, and the light is emitted from the sample to be detected and received by the integrating sphere and transmitted to the spectrometer for analysis. The absorbance of a solid sample and a liquid sample can be measured, the shading cap can reduce the influence of ambient light on the instrument, a light path does not need to be sealed in the whole detection process, external light has no influence on the instrument, use is convenient, and data is stable and accurate. Any wave band or full wave band can be analyzed, and tests prove that the integral measurement time is shorter than 1.5 s and the measurement speed is high.

Description

technical field [0001] The invention relates to the field of spectrophotometers, in particular to an ultraviolet-visible spectrophotometer. Background technique [0002] Ultraviolet-visible spectrophotometry is a method for measuring the absorbance of substances in the wavelength range of 200-760nm, which is used for identification, impurity inspection and quantitative determination. When light passes through the substance to be measured, the degree of absorption of light by the substance varies with the wavelength of the light. Therefore, by measuring the absorbance of the substance at different wavelengths, and drawing the relationship between the absorbance and the wavelength, the absorption spectrum of the measured substance can be obtained. From the absorption spectrum, the maximum absorption wavelength λmax and the minimum absorption wavelength λmin can be determined. The absorption spectrum of a substance has characteristics related to its structure. Therefore, a s...

AI Technical Summary

Problems solved by technology

The current UV-Vis spectrophotometer is mainly used to detect the absorbance of the liquid sample to be tested, and the whole process needs to be sealed during the detection, and the analysis time of a single sample in the whole band is relatively long, usually 2 minutes

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