Colored schileren photography device based on fiber-coupling LED light source

The utility model discloses a colored schileren photography device based on a fiber-coupling LED light source, which comprises n LED light sources of different colors, n condenser groups, n optical fiber input couplings, n optical fibers, n optical fiber output couplings and a schlieren system, wherein n is larger than or equal to 2. Each condenser group comprises a spherical lens, a relay lens and an optical coupler. The scattered light emitted from the LED light sources is coupled by corresponding optical fiber input couplings to be converged into corresponding condenser groups. After that, the light is successively subjected to the spherical lenses, the relay lenses and the optical couplers, and then the scattered light is transmitted to corresponding optical fiber output couplings through corresponding optical fibers. The light is subjected to the schlieren system after passing through the optical fiber output couplings and then is projected onto a to-be-detected region to form evenly mixed parallel light. Due to the adoption of the above technical solution of the present utility model, the condition in the prior art that the lenses of the condenser groups, installed on the back of a large-heat-capacity light source, are deformed when being heated so as to influence the image quality can be avoided. Meanwhile, the utilization rate of the light energy is improved.