Fig. 1. Principle of speckle reconstruction

Fig. 2. Principle diagram of speckle reconstruction spectrometer

Fig. 3. Simulation model diagram of spectroscopic structure

Fig. 4. Refractive index-wavelength diagram of IG2 material and PMMA material

Fig. 5. Unevenly distributed random numbers generated by spherical coordinates

Fig. 6. Two distributions and simulation results. (a) Non-uniform distribution of clustering towards the centre; (b) Simulation results of non-uniformly distributed 1 μm input; (c) Simulation results of non-uniformly distributed 1.01 μm input; (d) Uniform distribution; (e) Simulation results of uniformly distributed 1 μm input; (f) Simulation results of uniformly distributed 1.01 μm input

Fig. 7. Spectral input and measurement results of test light

Fig. 8. Measurement result of 5.01 μm wavelength

Fig. 9. Simulation measurement results of 1-10.9 μm wavelength

Fig. 10. Simulation results of 3000 K, 4000 K and 5000 K blackbody radiation