We have constructed a chirped amplitude modulation heterodyne ghost imaging (CAM-HGI) experimental system that demonstrates a robust ability against background light in experiments. In the experiments, the background light is simulated by irradiating a spatiotemporal random modulated light field onto the target. The effects of background light, modulation depth and modulation duration of the signal light source on CAM-HGI are investigated experimentally. The results show that the quality of CAM-HGI can be improved by increasing the modulation depth and the modulation duration of the signal light source, and more importantly, an image with a good signal-to-noise ratio (SNR) can be achieved even when the irradiation SNR is lower than −30 dB. This technique of CAM-HGI has an important application prospect for laser imaging in strong background light environments.

中文翻译：

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amplitude调幅外差重影成像的实验研究。

我们已经构建了amplitude调幅外差幻像成像（CAM-HGI）实验系统，该系统展示了在实验中对抗背景光的强大能力。在实验中，通过将时空随机调制光场照射到目标上来模拟背景光。实验研究了背景光，信号光源的调制深度和调制持续时间对CAM-HGI的影响。结果表明，通过增加信号光源的调制深度和调制持续时间，可以提高CAM-HGI的质量，更重要的是，甚至可以实现具有良好信噪比（SNR）的图像当辐射SNR低于-30 dB时。