UV-1200 high-precision spectrophotometer to measure spectral transmittance - Database & Sql Blog Articles

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High-Precision Spectrophotometer for Measuring Spectral Transmittance

Key words: high-precision spectrophotometer; transmittance; US instrumentation; UV-1100; UV-1800

This UV spectrophotometer system is a fully automated single-beam instrument based on a dual-grating monochromator. An integrating sphere is integrated into the optical path to eliminate beam polarization and non-uniformity, while the filter and detector are treated as a single unit to enhance measurement accuracy by simulating real-world conditions. The design emphasizes uncertainty analysis, with sources including light source stability, monochromator repeatability, beam uniformity, detector linearity, and stray light. The measured transmittance uncertainty of the filter is 5.859×10⁻³, meeting high-precision requirements. The UV-1800 dual-beam spectrophotometer is designed for optical remote sensing calibration. It uses a silicon trap detector, which offers advantages in size, weight, and power consumption, making it ideal for airborne and spaceborne applications. The instrument’s ability to measure both filter transmittance and detector response is critical for improving radiometric accuracy. Experimental results show that the absolute spectral response rate of the silicon trap detector has an uncertainty of less than 0.035%, making it suitable as a high-precision reference. The system features a single optical path to simplify alignment and reduce errors. A lock-in amplifier is used at the exit slit to improve the signal-to-noise ratio, addressing the challenge of weak light from the dual monochromator. The overall composite uncertainty for spectral transmittance measurement is 5.958×10⁻³, enabling direct application in filter radiometer measurements. The optical structure includes off-axis parabolic mirrors for efficient illumination, avoiding chromatic and spherical aberrations. The dual monochromator (dk242) operates in "plus" mode, doubling the spectral resolution. The exit beam is homogenized using an integrating sphere before reaching the detector, ensuring uniform irradiation and reducing measurement errors caused by angular variations. The system also incorporates a chopper and lock-in amplifier to enhance signal quality. Calibration experiments involved seven laser wavelengths, confirming the trap detector's absolute spectral response rate below 0.035%. Stability, polarization sensitivity, linearity, and spatial uniformity were tested, showing minimal fluctuations. Beam uniformity after integration was measured at 99.658%, and internal reflections were found negligible compared to other uncertainties. In conclusion, this high-resolution spectrophotometer achieves a transmittance measurement uncertainty of 5.859×10⁻³ over a 380–1000 nm range. Its design integrates real-world usage conditions, minimizing post-processing corrections and ensuring accurate radiation calibration. Future improvements will focus on enhancing the dual monochromator’s repeatability to further boost system accuracy. Key words: high-precision spectrophotometer; transmittance; US instrumentation; UV-1100; UV-1800

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