For problems of being easily affected by environment. low detection decision and poor stability in traditional methane detection system. a distributed multi-point laser methane detection system was designed based on tunable diode laser absorption spectroscopy technology and space division multiplexing technology. The system adopts distributed feedback semiconductor laser with waveleng... https://www.roneverhart.com/Lindell-Audio-LIN76-Vintage-Limiting-Amplifier-p14154/