The speckle imaging quality of space extended objects is limited by photon density in short exposure images.
空间扩展目标斑点成像的质量受到短曝光像中光子密度的限制。
Analyzing the carrier density and photon density of VCL in active region, the physical mechanism of gain clamping was revealed.
分析有源区内载流子和VCL光子密度的变化，揭示了增益钳制的物理机理。
The frequency-domain NIRS instruments modulate the light with a RF sine wave, which generates diffuse photon density wave (DPDW) in turbid tissue like brain.
频域近红外光谱系统利用一个高频正弦信号对光源进行调制，从而在大脑这类强散射介质中形成一种漫射光子密度波。
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