研究目的
Investigating the necessity of expanding the dynamic range in a shortwave infrared (SWIR) photodetector (PD) and proposing a method to achieve this.
研究成果
The paper concludes that the proposed method of expanding the dynamic range in SWIR photodetectors is both simple and effective, providing an extended dynamic range up to 100 dB. This method allows for better image quality and more information content in high-contrast images.
研究不足
The traditionally used methods for expanding the dynamic range have low efficiency, especially in large-format matrices with a step of not more than 15 μm. The proposed method, while effective, may still face challenges in maintaining sensitivity in cells close to saturation.
1：Experimental Design and Method Selection:
The study focuses on expanding the dynamic range in SWIR photodetectors using accumulative cells with individually variable transfer characteristics.
2：Sample Selection and Data Sources:
The research uses a photodiode array from In
3：53Ga47As/InP of format 640 × 512 elements. List of Experimental Equipment and Materials:
The electrical circuit of the cumulative cell based on CTIA is utilized, with specific capacitances (C1 = 25 fF, C2 = 64 fF, C3 = 64 fF).
4：Experimental Procedures and Operational Workflow:
The method involves auto-tuning of accumulation time individually in each cell of the integrated reading circuit.
5：Data Analysis Methods:
The study compares images obtained in linear and HDR modes to evaluate the effectiveness of the proposed method.
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