Abstract
In this paper, the driver circuit for N2O gas detection system based on tunable interband cascade laser (ICL) is developed. Considering the influence of power supply stability on the digital-analog hybrid drive circuit of tunable diode laser absorption spectroscopy (TDALS), the high-efficiency TPS5430 is used to design the positive and negative power supply circuit. The large electrolytic capacitor + post-stage LC filter combination filter is used to effectively filter out high and low frequency ripple and switching noise. The use of thick high current trace + via + multilayer printed circuit board (PCB) design makes the line temperature rise smaller, more stable and durable, and uses high frequency shielding inductance to effectively reduce radiation interference to ensure the stability of the drive. The STM32F407, a highperformance microcontroller based on the ARM Cortex-M4 core, is used as the master control chip and generates a sawtooth scanning signal. The direct digital synthesizer (DDS) chip ICL8038 is used to generate a sinusoidal modulated signal of a specific frequency. The two signals are superimposed by a reverse addition circuit, and the laser drive signal is generated by a developed positive feedback balanced voltagecurrent conversion circuit. Experimental results show that the driver circuit can well meet the drive development requirements of N2O gas detection systems based on tunable interband cascade laser.
Highlights
Nitrous oxide (N2O) is an important greenhouse gas with a single molecule warming potential of about 298 times that of carbon dioxide (IPCC, 2007), and it can remain in the atmosphere for a long time
For the driving needs of N2O gas detection system of tunable interband cascade laser, STM32F407 is used as the master control chip, and its built-in DAC is used to generate the sawtooth scanning signal and the sinusoidal modulation signal generated by ICL8038
This design completed the development of a driver circuit of N2O gas detection system based on tunable interband cascade laser
Summary
Nitrous oxide (N2O) is an important greenhouse gas with a single molecule warming potential of about 298 times that of carbon dioxide (IPCC, 2007), and it can remain in the atmosphere for a long time. It destroys the ozone layer, leading to the enhancement of solar ultraviolet radiation, directly causing harm to the human body[1,2]. For the driving needs of N2O gas detection system of tunable interband cascade laser, STM32F407 is used as the master control chip, and its built-in DAC is used to generate the sawtooth scanning signal and the sinusoidal modulation signal generated by ICL8038. The superimposed signal is driven by the designed signal superposition and positive feedback balanced voltage-current conversion circuit to drive the laser
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