To appraise the photoelectric performance of area CCD for the cloud and aerosol polarization camera (CAPC), a kind of general photoelectric parameter automatic measurement apparatus is proposed. The equipment is produced possessing optical electromechanical integrated structure, which is comprised of the illumination assembly, the CCD imaging assembly and the control assembly. The software of large area CCD parameter automatic test system is designed and achieved. It can realize automatic measuring for the key parameters of a great variety of linear or area CCD, including defective pixels, dark current, relative spectral responsivity, saturation grey value, linearity error, etc. The photoelectric parameters and the spectral response of CCD produced by E2V Company are measured and processed. The research results reveal that the dark current is double when the working temperature of CCD is increased by 6℃. The relative spectral response measurement covers the spectral range from visible to near infrared bands and the spectrum resolution is 1 nm. The automatic measurement program can effectively improve the work efficiency approximately one fold and the overall test time is reduced by about one third. The evaluation of the detector performance provides a guarantee for the performance test and calibration requirements of the whole instrument.
KEYWORDS: Instrumentation engineering, Charge-coupled devices, Imaging systems, Signal to noise ratio, Analog electronics, Sensors, Signal processing, Cameras, Polarization, Polarimetry
A CCD imaging system in the Directional Polarimetric Camera is developed, which is comprised of timing driving unit, pro-processing and analog-front-end unit, FPGA main control unit, internal communication and remote measurement unit, image transmission interface unit, and so on. A CCD driving timing method with twice frame transfer and once horizontal readout is proposed to effectively eliminate the residual charge of last frame image and improve the signal-to-noise ratio. The performance of this CCD imaging system is verified. The experimental results show that the 14bit image data can output steadily with a frame frequency of 2.02 frames per second. The imaging signal-to-noise ratio can reach 54.93dB when the CCD is lower than saturated. The dynamic range of the CCD detectable signals is 68.98 dB and the nonlinearity error under different wavelengths is less than 1%. The instrumentation can satisfy the operational requirements such as stable output, excellent linear performance, high signal-to-noise ratio and large dynamic range.
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