In order to measure spectral transmittance of solar-blind filter ranging from ultraviolet to visible light accurately, a high-precision filter transmittance measuring system based on the ultraviolet photomultiplier is developed. The calibration method is mainly used to measure transmittance in this system, which mainly consists of an ultraviolet photomultiplier as core of the system and a lock-in amplifier combined with an optical modulator as the aided measurement for the system. The ultraviolet photomultiplier can amplify the current signal through the filter and have the characteristics of low dark current and high luminance gain. The optical modulator and the lock-in amplifier can obtain the signal from the photomultiplier and inhibit dark noise and spurious signal effectively. Through these two parts, the low light passing through the filters can be detected and we can calculate the transmittance by the optical power detected. Based on the proposed system, the limit detection of the transmittance can reach 10-12, while the result of the conventional approach is merely 10-6. Therefore, the system can make an effective assessment of solar blind ultraviolet filters.
The UV image intensifier is one kind of electric vacuum imaging device based on principle of photoelectronic imaging.
To achieve solar-blind detection, its spectral response characteristic is extremely desirable. A broad spectrum response
measurement system is developed. This instrument uses EQ-99 laser-driven light source to get broad spectrum in the
range of 200 nm to 1700 nm. A special preamplifier as well as a test software is work out. The spectral response of the
image intensifier can be tested in the range of 200~1700 nm. Using this spectrum response measuring instrument, the
UV image intensifiers are tested. The spectral response at the spectral range of 200 nm to 600 nm are obtained. Because
of the quantum efficiency of Te-Cs photocathode used in image intens ifier above 280nm wavelength still exists,
especially at 280 nm to 320nm.Therefore, high-performance UV filters is required for solar blind UV detection. Based on
two sets of UV filters, the influence of solar radiation on solar blind detection is calculated and analyzed.
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