Analysis of the Causes of Spectrometer Errors

Analysis of the Causes of Spectrometer Errors

Although the spectrometer itself has high measurement accuracy, when measuring the element content in the sample, the results obtained are often inconsistent with the real content, there is a certain error, and due to the influence of various factors, the content of some materials is very low. The main factors that cause instrument detection errors can be divided into the following categories:

System error sources

When the content and chemical composition of the standards and samples are not exactly the same, the strength of the matrix line and the analysis line may change, thereby introducing errors. To eliminate systematic errors, the standard sample preparation requirements must be strictly adhered to. To check for systematic errors, a chemical analysis of various proofreading results is required.

When the steel sample in the pouring state is different from the steel-like metal structure in the annealed, quenched, tempered, hot rolled, and forged state, the measurement data may be different. Overlapping interference of unknown element spectral lines. For example, when adding a deoxidizer or desulfurizer during the smelting process, unknown alloy elements are mixed and a systematic error is introduced. When the physical properties of the standard and the sample are inconsistent, the characteristic lines of the excitation will be different, which will cause systematic errors.

Analysis of the Causes of Spectrometer Errors

Errors related to uneven sample composition. Due to the small amount of sample consumed by the photoelectric spectroscopic analysis, the elements in the sample are unevenly distributed and the structure is uneven, resulting in different analysis results in different parts, with occasional errors. The main reasons are as follows:

Inclusions are introduced during the smelting process, resulting in segregation, resulting in uneven distribution of sample elements. Sample defects, pores, cracks, bubbles, etc. Grinding sample line, grinding sample overheating, grinding sample surface for too long, and fingerprints. To reduce occasional errors, careful sampling is required to eliminate sample inhomogeneities and casting defects, and analysis can be repeated multiple times to reduce analysis errors.

Other factor errors

Increasing room temperature will increase the dark current of the photomultiplier tube and reduce the signal-to-noise ratio. Humidity is likely to cause leakage and discharge of high-voltage components, making analysis results unstable. Argon is not pure. When argon contains oxygen and water vapor, the excitation point is deteriorated. If the argon line and electrode holder are not discharged, the analysis results will be worse.

Precautions during operation

1. Avoid holding the handheld spectrometer in the sun for a long time, because this will easily damage the LCD display, and the ambient humidity between 0-95% is the best. Also do not put it in the environment with liquid or corrosive solvents, this will also cause great damage to the handheld spectrometer.

2. When replacing the detection window of the handheld spectrometer, be sure to perform cleaning in a dust-free environment to prevent dust from invading. The detector window must be covered to prevent dust from entering and it must be replaced quickly.

3. If the handheld spectrometer needs to be cleaned with sticky glue, try to use gauze to absorb a small amount of alcohol and gently wipe it around the small hole. Remember, never insert anything into the detector as this may damage the detector and cause major losses to the handheld spectrometer.

4. If there is dirt or dust on the surface of the handheld spectrometer, first blow it away with compressed air, and then thoroughly clean it with a small piece of wet gauze. Do not use a rough cloth to avoid holding the handheld. The spectrometer was damaged.

5. The touch screen of the handheld spectrometer is made of sensitive electronic devices. It should be cleaned regularly with a soft, lint-free microfiber cloth. Do not use detergents or liquid cleaning supplies for cleaning, as this may cause the screen of the handheld spectrometer to Scratched.

Precautions for maintenance

1. The focus of maintenance should be the places that users often come in contact with. These contact points are prone to failure. The maintenance of these contact points should be strengthened.

2. The X-ray tube and detector in the equipment are precision components.

3. It is necessary to make a good record of the maintenance of the analytical instrument, including the maintenance time, a brief description of the maintenance situation, and replacement of parts. By recording, you can understand the maintenance status and dynamics of the analytical instrument, and then grasp the cause of the failure of the analytical instrument.

4. Dedicated and dedicated. Store the equipment in a dry environment. Do not store the instrument in the sun for a long time to prevent damage to the LCD display. Do not store the instrument in foggy, liquid or corrosive solvents.