[Research on the non-source temperature calibration of Multispectral pyrometer]

Area of Science:

• High-temperature measurement
• Optical pyrometry
• Metrology

Context:

• Multispectral pyrometers offer high resolution and signal-to-noise ratios for high-temperature measurements.
• Calibration of non-source temperatures exceeding 3000°C lags behind pyrometer development, limiting precision and applications.
• Existing calibration methods are insufficient for extreme high-temperature regimes.

Purpose:

• To introduce a novel calibration method for non-source temperatures beyond the capabilities of current multispectral pyrometers.
• To establish a precise temperature-voltage (T-U) model for accurate calibration.
• To overcome the limitations hindering the precision and application range of high-temperature pyrometers.

Summary:

• A power-function-based temperature-voltage (T-U) model was developed for non-source temperature calibration.
• The derivative least square method was employed to determine model parameters, enabling calibration.
• Theoretical and experimental data validated the method's efficiency and precision.

Impact:

• The new method significantly improves the precision and expands the application range of multispectral pyrometers for non-source temperature measurement.
• Theoretical analysis defined calibration ranges with high precision (better than 0.3%, 1%, and 3%) within the 0.4-1.1 micrometer spectral range.
• This advancement facilitates more accurate high-temperature measurements in scientific and industrial applications.