Design And Research On High-Speed Spectrometer For Continuous Wave HF Chemical Laser

The spectrum is one of the most important parameters of Continuous Wave HF Chemical Laser, the oscillation of each line's intensity is the chief characteristic of it, and thus a measurement in real time is urgent needed. Owing to the weakness of array detector technology, the spectrometers in HF band are hard to obtain. Therefore, a structure with common PbS infrared detectors is brought forward in the thesis to measure the fluctuation of the intensity of lines in high-speed, by means of improving the optic construction.Due to the big size of PbS detectors, the volume of the instrument is too huge to accept in conventional structure of the multi-channel spectrometer, if the dispersion wants to be kept. The method called layered receiving and interlaced collecting is proposed accordingly, and the experiment confirms that it can reduce the request of dispersion effectively, as well as the volume of system. Further research shows that the calibration to astigmatism, curvature of field, and coma aberration is the major request on design; in addition, the location of lines needs to be demarcated.A horizontal and asymmetric Czerny-Turner structure is elected, and the parameters are optimized via detailed analyses of aberration. The result of calculation reveals that the focus surface can be considered a plane, and the size of focus spots can match the detectors, thus the effects of imaging achieve the demands of design.According to the analyses, an experimental device has been set up, the separate detector modules which can slip on layers horizontally are fit to the receiving system, as well as a board installed at the location of the focus plane. Take He-Ne laser for reference, the device is calibrated, and through the detecting system which response rate and background noise has been measured, the whole system is experimental investigated, and the history of the intensity of two important lines are presented. The conclusion shows that the scheme of spectrometer is feasible.On this research, the plan and referenced data for engineering are provided, some problem of project are detailed, and the further works should be developed are indicated. Therefore, the foundation for the instrument has been established.