The near-infrared spectrometer is an analysis device based on the principle of selective absorption of infrared by gas or liquid. It has high sensitivity, fast response, large analysis range, good selectivity, anti-interference ability, etc. Features, widely used in petrochemical metallurgy and other industrial productions.
The light source of the near infrared spectrometer uses the method of two upper and lower electrodes, and when current is applied, a spark spectrometer light source is formed between the electrodes.
In this spark spectrometer light source, the air or other gas between the electrodes is generally at atmospheric pressure.
Therefore, the discharge takes place between electrodes filled with gas and relies on the current flowing between the electrodes to make the gas glow, which is based on a gas discharge.
The light source of the spark and wave controlled low-voltage spectrum analyzer is under the action of a capacitive electric field and discharges in a controlled atmosphere;
The light source of the spark spectrum analyzer is placed in discharged in a thin and controlled atmosphere under the action of a DC electric field; the light source of the plasma spark spectrometer is discharged in a controlled atmosphere under the action of a high-frequency electromagnetic field (the relationship between voltage and current between the electrodes does not obey Ohm's law).
The function of the spectrum analyzer's light source is to convert the element to be measured into a gas state and then to excite it into a spectrum which is converted into a photocurrent according to the intensity of the element's spectral line . The intensity of the spectral line is converted into the content of the elementetc.
The dynamic process of the light source is to change the sample from the solid to the gaseous state, some of the elements are excited and emit a spectrum, and these gaseous samples become continuous around the gaseous distributed Also, the samples in the analysis gap are constantly updated to achieve dynamic balance. If the spark spectrometer's light source is excited for a certain period of time, the concentration of the element to be measured in the vapor cloud increases. Only when the concentration in the cloud of vapor is large enough to achieve a large concentration. photoelectric signal.
Whether the near-infrared spectrometer is stable or not directly affects the quality of the measurement data from the instrument. Therefore, the gas control system should be checked and maintained regularly.
First, do a test, turn on the power switch of the control system,put the solenoid valve in the working state, then open the gas cylinder and the pressure reducing valve and set the function indicate the nominal value of the gas pressure and close it. Watch the pointer on the manometer on the pressure reducing valve on the gas bottle. It shouldn't fall off, or only slightly, within a few hours, otherwise there's an air leak in the gas circuit that needs to be checked and eliminated.
If the maintenance work on the near infrared spectrometer is done well, the service life can be extended and the job can be done better.