提出了利用毛细管X光会聚透镜(CFXRL)提取潜指纹的方法特征X射线成像法。为了利用该法提取潜指纹，设计了基于CFXRL和实验室普通X射线光源的微束X射线荧光谱仪，CFXRL的焦斑直径和放大倍数分别为32.2 μm和2940。这便于在高空间分辨下测量潜指纹中化学元素对应的特征X射线，从而实现快速获取潜指纹的目的。另外，特征X射线成像法还可以判断指纹所有者在留下指纹前接触过的物质种类，这对刑侦鉴别也具有重要的应用价值。实验证明，CFXRL在潜指纹提取中存在着潜在的应用价值。

The characteristic X-ray imaging technology is proposed to obtain the latent fingerprint. To obtain the latent fingeprint, the X-ray fluorescence spectrometer based on the capillary focusing X-ray lens (CFXRL) and the laboratory X-ray source is designed. The focal spot diameter of CFXRL and the gain of CFXRL are 32.2 μm and 2940 respectively. This is helpful in detecting the characteristic X-rays of the elements in latent fingerprint efficiently, with high spatial resolution. Characteristic X-ray imaging technology can judge the substance contacted by the fingerprint owner before leaving it. This is also useful in forensic sciences. It is proved that the CFXRL has potential applications in obtaining the latent fingerprint.