First, practice has proved that in order to ensure the accuracy of the analysis results, the best analytical conditions should be selected in daily work.
1. Choose the best indoor temperature conditions, humidity conditions and the best argon purity.
2. Choose to flush, pre-ignite, and integrate time.
3. Select the discharge parameter of the light source.
4. Processing and cleaning of auxiliary electrodes.
5. Daily standardization work. Standard sample work.
6, the final metering accuracy.
Second, the main reasons for the error:
1. Argon gas is impure: When argon contains oxygen and water vapor, the excitation spots are deteriorated. If the argon gas pipe and the electrode holder are not discharged, or there is turbidity, the analysis result is deteriorated.
2. The sample requires a smooth surface. When the sample is placed on the electrode holder, there must be no air leakage. If there is a leak, the sound of the sample is not normal. The excitation spots turn white.
3, the analysis sample and the control standard sample thickness should be consistent, not cross-grain, the grinding force should not be too large, and the force should be uniform, to strive for consistent operation, excessive force, easy to cause surface oxidation of the sample.
4. When grinding high-nickel-chromium steel, use a new grinding wheel to grind the sample. Grinding operations are more demanding.
5, the sample can not have segregation, cracks, pores and other defects, the sample should be representative.
6. The tip of the W electrode should have a certain angle so that the optical axis must not deviate from the center. The discharge gap should remain the same, otherwise the intensity of the line focused on the spectrometer will change. After repeated discharge, the W electrode will be long and change the gap discharge distance. The metal vapor generated by the excitation will contaminate the excitation. Therefore, it is necessary to clean the electrode with a brush after one stroke.
7. The inner surface of the lens is used to maintain vacuum and is often contaminated by oil vapor from the vacuum pump: the outer surface is subject to metal vapor adhesion during analysis. The transmittance is significantly reduced, the transmittance of the carbon, sulfur, and phosphorus lines of ≤200 nm is significantly lowered, and the slope of the working curve is lowered, so the concentrating mirror is periodically cleaned.
8, the degree of vacuum can not reduce the sensitivity analysis, especially more apparent ≤200nm wavelength, degree of vacuum required for this 5X10-2mm / Hg i. The change in the position of the exit slit is most affected by the temperature. Therefore, it is important to maintain the constant temperature system 32C±0.1C in the spectroscopic room. It is also required to maintain the same temperature in the room, so that the exit slit is difficult to deviate.
9. The change of the power supply voltage easily causes the change of the discharge voltage of the excitation unit, and the power supply voltage is required to be within 10%.
10. Changes in temperature and humidity. An increase in room temperature increases the dark current of the photomultiplier tube and reduces the signal-to-noise ratio. Humidity is likely to cause leakage and discharge of high-voltage components, which makes the analysis results unstable.
This article is reproduced from: http://
JRT has been R&D Laser Distance Sensor every year. In this part, we put every new sensor here. To help our customer to find the lastest item. To know the updates we are doing, what's new for laser distance modules. What kind of Laser Distance Meter sensor we can make.
Best Regards
JRT Team
New Laser Distance Sensor,New Laser Distance Module,New Distance Sensor,New Laser Sensor
Chengdu JRT Meter Technology Co., Ltd , https://www.rangesensors.com