Spectrometer Based On Acousto-Optic Tunable Filter For Contactless Spectral Monitoring In Extreme Conditions

The application of an optical spectrometer based on an acousto-optic tunable filter (AOTF) in an optical spectral monitoring system for processes occurring under extreme conditions is considered. A structural diagram of such a spectrometer is presented and the choice of its element base are discussed. The modes of operation of the spectrometer based on AOTF for various types of control signal are considered: a signal with linear frequency modulation (LFM) and a signal with stepwise frequency tuning (SFT). The results of computer simulation of the spectrum spread function for different types of modulation are presented. The results show broad prospects for the use of an AOTF-based spectrometer when using the SFT in monitoring systems for scanning a specific set of spectral lines, from which it is possible to obtain comprehensive information about the state of the controlled process. An essential advantage of the spectrometer when using the SFT-modulation is its speed, because in this case there is no need to scan the whole range and therefore the time of spectrum analysis is significantly reduced.