DAC	Digital-to-analog convertor
ADC	Analog-to-digital convertor
PWM	Pulse-width modulation
PID	Proportion-integration-differentiation
TDLAS	Tunable diode laser absorption spectroscopy
MCU	Microcontroller unit
DFB	Distributed feedback
PD	Photodetector
PCB	Printed circuit board
NMOS	N-metal-oxide-semiconductor
LPF	Low-pass filter
WMS	Wavelength modulation spectroscopy
FPGA	Field programmable gate array
NTC	Negative temperature coefficient
TEC	Thermoelectric cooler