Research of high-precision spatial positioning method of optical fiber fire extinguishing devise for special vehicles based on Raman spectroscopy technology

High-precision flame spatial positioning technology has become a research hotspot in the field of on-board fire fighting protection for special vehicles. This paper proposed a high precision fiber-optic sensing spatial localization method based on Raman spectroscopy. By using the Field Programmable Gate Array (FPGA) to dynamically adjust the phase shift of the sampling clock1-2, the Stokes signal and the anti-Stokes signal are spatially dynamically oversampled to achieve a 250MHz ADC which can hit an equivalent sampling rate of 2GHz after sample data recombination, and the flame spatial positioning accuracy can be up to 5cm. This method is based on the premise of guaranteeing the original index of fiber optic fire extinguishing device. It can effectively identify small flames. In the detection of fire events can also accurately give the specific location of the fire. This effectively solves the technical difficulties in detecting blind areas of special vehicle optical fiber fire extinguishing devices and greatly improves the flame positioning accuracy of fire extinguishing devices, which lays a foundation for accurate regional spraying of vehicle fire extinguishing devices.