Fig. 1. Structural diagram of integrating sphere

Fig. 2. Working principle of ellipsoidal reflector

Fig. 3. Reflectivity of pressed PTFE coating

Fig. 4. Pressed coating of integrating sphere

Fig. 5. Schematic of calibration of lamp-board system

Fig. 6. Calibration of integrating sphere by spectrometer

Fig. 7. Irradiance of standard lamp at 500 mm

Fig. 8. Comparison between spectral radiance of UV integrating sphere and solar reflected radiance after conversion

Fig. 9. Detection lattice of surface uniformity

Fig. 10. Surface uniformity distribution

Fig. 11. Variation of surface non-uniformity with wavelength

Fig. 12. Measurement directions of angular uniformity

Fig. 13. Angular non-uniformities at 380 nm in horizontal, vertical, and ±45 ° directions

Fig. 14. Measured angular non-uniformities at different wavebands in horizontal direction

Fig. 15. Variation curve of angular non-uniformity with wavelength at 5° angle

Fig. 16. Variation of angular non-uniformity with wavelength at different angles

Fig. 17. Variation of relative change of color temperature of integrating sphere with aperture opening

Fig. 18. Stability of integrating sphere output radiance

Fig. 19. Influence of fluorescence effect on ultraviolet band

Fig. 20. Temperature sensor. (a) Installation position; (b) real object

Fig. 21. Temperature measurement in integrating sphere