basic structure
Atomic emission spectrometers are divided into two types: spectrographs and photoelectric direct-reading spectrometers. The latter is divided into multi-channel spectrometers, single-channel scanning spectrometers and full-spectrum direct-reading spectrometers.
The basic structure of the atomic emission spectroscopy instrument consists of four parts: excitation light source, sampling system, spectroscopic system, and detection system.
Development of ICP-AES detector
Photography
ICP multi-channel direct reading spectrometer PMT
ICP single-channel scanning spectrometer PMT
ICP full spectrum direct reading spectrometer CCD
Usually the sample solution in the analysis process is atomized by the atomizer of the sampling device and enters the ICP. Then the sample is excited by the plasma, emits the characteristic spectrum of the element and is reflected by the mirror, and then focuses on the entrance slit of the spectrometer . When the light enters the spectrometer, it hits the grating. On the focal plane of the concave grating spectrometer, a spectral line channel of an element is set for the spectral line of each element, an exit slit, a set of photomultiplier tubes and its corresponding negative high voltage power supply and other detection circuits are set. Each channel measures one element and installs multiple (up to 70) channels to receive the spectrum of different elements at the same time and record their intensity. (There is no ICP multi-channel direct reading on the market).
The single-channel scanning plasma spectrometer has one channel, and only one exit slit, one photomultiplier tube and its corresponding detection circuit are installed on the focal plane of the instrument. When analyzing different elements, the grating diffraction angle can be rotated according to the size of the spectral line wavelength. The analysis line of the element to be tested falls on the exit slit in order of wavelength, so that it can be in a wide range from vacuum ultraviolet to near infrared. Choose the spectrum arbitrarily. According to the intensity of the spectrum, the content of the corresponding element can be calculated.
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