Каков процесс индивидуальной настройки спектрометров перед отправкой?

Spectrometers are widely used for the testing of various metals and alloys, quickly distinguishing the content of specific elements. They are primarily applied in two major industries: pre-furnace material inspection and raw material inspection.

However, based on the differentiated needs of different customers, the spectrometer's hardware structure, software functions, and parameters need to be specifically adjusted to achieve the required precision.

Standard Customization Process

1. Ensure Instrument Performance is Good

1.1. Environmental Check

Because spectrometers have built-in CCD or CMOS detectors, they have extremely high environmental requirements. To ensure normal operation, the instrument must be placed in a sufficiently open area, away from high and low frequency furnaces and vibrations;

In addition, the temperature must be within the range of 34±0.5 degrees Celsius, humidity below 75%, and vacuum level below 20.

1.2. Instrument Check

First step: Clean the spark platform and lens ; Before exciting the sample, the spark stage and lenses must be cleaned to ensure that light can pass completely through the lenses and be projected onto the grating, thereby accurately analyzing the element content.

Second step: Argon Gas Rinsing ; After cleaning, the first step is to rinse with argon gas to fill the entire spark stage and remove air to prevent light absorption and inaccurate results.

Third step: Shutter Test ; The core function of the spectrometer's shutter is to precisely control the time it takes for the detector to receive light signals, protecting the detector and ensuring data accuracy. Simply put, the shutter moves up and down at different stages to block or allow light to reach the lens, thus ensuring data accuracy. Therefore, proper shutter movement is crucial.

Fourth step: Machine Warm-up ; If the machine has not been excited for a long time, the initial excitation energy is insufficient to fully excite the sample. Therefore, before formal excitation, waste samples need to be continuously excited to warm up the machine and increase the excitation energy.

Fifth step: Interference Test ; The purpose of the interference test is to detect the presence or absence of signal, check repeatability, and determine the quality of the excitation effect. By repeatedly exciting the same point, it is determined whether the curves overlap.

2. Calibration

2.1. Operation:

By exciting multiple standard samples, the spectral lines are displayed in the software. The peak values of different spectral lines are mapped to elemental lines at specific wavelengths, thus achieving calibration.

2.2. Purpose:

The core purpose of spectrometer calibration is to eliminate instrument system errors, establish a precise correspondence between the detected signal and the true properties of the substance, and ensure the accuracy, repeatability, and traceability of the detection results.

Specifically, this is reflected in the following aspects: Accuracy of calibration wavelength: Correcting the deviation between the detector pixels and the actual wavelength, ensuring accurate identification of characteristic spectral lines of substances during qualitative analysis, and avoiding misclassification of element types.

3. Curve Fitting and Model Establishment

3.1. Operation:

Using the instrument's software, linear or nonlinear fitting is performed with the elemental content of the standard sample as the abscissa and the corresponding characteristic spectral line intensity as the ordinate.

Matrix correction coefficients and interference correction coefficients are introduced to eliminate spectral line interference from coexisting elements and matrix effects, improving curve correlation.

3.2. Purpose:

Calibrating the quantitative relationship between intensity and content: Establishing a reliable model of "spectral intensity - elemental content" to eliminate the influence of differences in pixel response, light source fluctuations, and matrix effects, ensuring that quantitative analysis results are consistent with the true content.

Ensuring data reliability:Calibration ensures that instrument detection data conforms to industry standards (e.g., ISO 17025), guaranteeing that results from different times and instruments testing the same sample are comparable and traceable.

4. Curve Validation and Optimization

4.1. Operation:

First, standardization is performed by exciting high and low standards. Standardized instrument calibration, sample processing, and parameter setting procedures can avoid errors caused by operational differences, ensuring consistent detection results for the same sample at different times and on different instruments, avoiding misjudgments.

Second, testing is conducted using 1-2 quality control samples with intermediate concentrations. The deviation between the detected value and the standard value is compared; the deviation must be within the allowable range. If the deviation is too large, parameters need to be re-optimized or additional standard samples added, and the fitting model adjusted until the standard is met.

4.2. Purpose:

Identify calibration loopholes : Through quality control sample testing, verify the fitting deviation and linearity range of the curves to identify problems such as inappropriate standard sample selection and unreasonable parameter settings, preventing erroneous curves from being used in actual testing.

Eliminate interference factors : Introduce matrix correction and interference element correction coefficients during optimization to offset the effects of sample matrix effects and spectral line overlap, making the "light intensity-content" correspondence more consistent with the actual sample testing scenario.

Ensure data consistency : Regular verification and optimization can offset the effects of instrument drift and environmental changes, ensuring the repeatability of test results across different batches and meeting the stringent requirements for data accuracy in metal material quality inspection and trade acceptance.

5. Curve saving and application:

Save the calibration curves by name (labeling the standard sample type, element, and creation time) for direct retrieval when testing similar samples later.

Regularly check the curve stability using quality control samples; if drift exceeds the threshold, recalibrate.

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