粒子场离轴滤波全息技术是减少背景噪声影响、改善粒子场再现像质量的有效方法。滤波器尺寸与再现粒子像密切相关,合适的滤波器尺寸有利于粒子的识别和测量。解析分析了高通滤波器尺寸、4F系统前焦距及粒径对圆形粒子离轴滤波全息再现像强度分布的影响规律,数值模拟了不同尺寸的高通滤波器对相同粒径粒子全息再现像强度分布的影响,并开展了离轴滤波全息实验。研究结果表明,高通滤波器可以有效提高粒子图像的对比度;粒子尺寸不变时,滤波器尺寸越小或4F系统前焦距越大,再现粒子像强度分布越均匀,同时边界梯度越大;滤波器尺寸和4F系统前焦距恒定时,粒子越大,再现粒子像内部逐渐呈现明暗相间变化的圆环,同时粒子边界越来越清晰。 Particle field off-axis filtering holography is an effective way to reduce the influence of background noise and improve the reproduction quality of particle field. The size of the filter is closely related to the image of the particle being reproduced, and the proper filter size facilitates the identification and measurement of the particle. The influences of the size of the high-pass filter, the front focal length and the particle size of the 4F system on the holographic reconstructed image intensity distribution of the circular particle off-axis are analyzed and analyzed. The distribution of holographic reconstructed image intensity of the particle with the same particle size is numerically simulated The effects of off-axis filtering holography were also investigated. The results show that the high-pass filter can effectively improve the contrast of the particle image. When the particle size is constant, the smaller the filter size or the larger the front focal length of the 4F system, the more uniform the image intensity distribution is and the larger the boundary gradient is. When the size and the front focal length of the 4F system are constant, the larger the particles are, the larger the internal particle size is, the more the phase of the light and the dark are changing gradually. The boundary of the particles is clearer and clearer.