A fibre-optic high-speed lighting spectrograph

Natural lightning is random and transient, and precise research on the internal characteristics of lightning discharge channels requires high-resolution measurements. And the existing regenerative spectrometers have low time resolution, so it is particularly important to design a fibre-optic lightning high-speed spectrometer device with high time resolution. The article introduces a fibre-optic high-speed lightning spectrometer device, i.e. using the grating diffraction principle to decompose lightning into spectra consisting of different wavelengths, fixing the position of the bright stripe in the centre of the lightning spectrum with a spectral positioning camera, picking up the light intensity signals with N fibre-optic arrays uniformly arranged on the spectral lines of different wavelengths and transmitting the light signals to a high-speed data acquisition module, which will perform the data acquisition after photoelectric conversion. It involves the fields of optics and electricity. The device includes: a grating, a convex lens, a receiving screen, a fibre optic, a photoelectric converter, a high speed data acquisition module and a spectral positioning camera. The device can measure the high time resolution waveform variation curves of N light components of different wavelengths or frequencies of a lighting, which can be used for more detailed lighting studies.