Look at the working principle and precautions of the spectroscope
- Clicks: 1969 Release time: 2015/3/11
working principle
An electric arc generator or a spark generator (excitation light source) causes an arc or spark to be generated between the substance to be analyzed and the electrode, and the substance to be analyzed and the substance constituting the electrode are emitted by the arc or the spark, and the light enters the spectroscope Thereafter, spectra arranged in order of wavelength are formed. When different elements are excited, the formed spectra are different from each other. Observing the difference in the spectrum of different elements, the chemical composition of the analyte can be determined. When the characteristic line of an element appears in the spectrum, it indicates the presence of such element in the sample. Using the brightness of the line, you can determine how much the element is.
The instrument forms the spectrum of the radiant light through a series of special optical components inside the instrument. The light emitted by the arc point passes through the protective glass, the condensing mirror, the transmitting mirror, the uniform and stable illumination slit, and the slit is located on the focal plane of the objective lens 6. The light emitted by the slit is converted into parallel light by the objective lens 6, and is dispersed by the dispersive prism. The right side of the prism is plated with a reflective layer, the smooth surface is returned by the line, and again dispersed by the dispersive prism, and the dispersion after dispersion The light again passes through the objective lens 6 and converges. After the refractive prism, the microscope forms a spectral image at the light bar. Through the magnifying view of the eyepiece, the obtained spectrum is observed. The rotating prism can make the spectral interval of different wavelengths enter the field of view, and the wavelength can be The drum reading is read on the wavelength drum and the wavelength is found from the corresponding curve of the wavelength and wavelength drum readings. The mirror reflects the light source image onto the light screen, and the eye can observe the light source illumination through the mirror.
Instrument maintenance
The reasonable maintenance of optical instruments directly affects the service life and performance of the instrument, so it is very important.
1) The instrument should be stored in a dry place to prevent mildew of optical parts. Always keep exposed optical parts clean, if dust is cleaned with a soft brush or suede. If grease or oil marks are used, immediately wipe off a small amount of the mixture with a cotton wool (ratio 1:2).
2) Handle gently to prevent collision with other items. Do not use too much force when replacing the electrode.
3) Do not touch the electrode holder and electrode during operation to prevent electric shock. Do not use the eye to look directly at the arc to avoid stab the eyes.
4) Clean the instrument after use and put it into the instrument box.
5) Replace the protective glass after it has been dirty.
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