Linearity measurement for image-intensified CCD

ABSTRACT To the characteristic of the ultraviolet CCD (UV ICCD), t echnique of the linearity measur ement of the UV ICCD camera is studied based on the theory of radiometry. Approach of linearity measurement is discussed, and a kind of measurement system of the UV ICCD has been develope d based on the method of neutral density filter. It is very important that the transmittance of the filter is independent of the wavelength in the method of neutral density filter. Black metal screen mesh with different transmittance is used in our system, an d calibration of the filters’ tran smittance in different working positions has been done. Meanwhile, to assu re the uniform of the received radiation on the target of the detector at any test points, an integrating sphere is placed behind the neutral filter to balance light. The whole measurement system mainly consists of a deuterium lamp with high stabilization, the attenuation film with transmission, integrating sphere, optical guide and electro-shift platform. Auto control is realized via special software during the test. With this instrument, the linearity of the UV ICCD was measured. Experimental results show that the nonlinearity of the UV ICCD under fixed-gain is less than 2% and the un certainty of measurement system is less than 4%. Keywords: Ultraviolet; ICCD; linearity measurement; uncertainty