New optoelectronic devices for the Near and Mid-Infrared spectral range open completely new possibilities for portable sensors creation. Using infrared LED-PD optopairs allows developing an instrument that is smaller, less expensive and energy-saving.

Quasi-CW mode

LEDs offer numerous benefits due to possibility for different operation modes. Optical parameters of light emitting diodes strongly depend on the regime of operation that you choose. To receive maximum average power we recommend using pulse modes with duty cycle 50% (quasi-continuous wave mode) or 25%. This mode provides signal modulation at certain frequency and allows obtaining higher output intensity than in case of using hard CW (continuous wave) mode.



Spectra at different currents in the quasi-CW mode (frequency 0.5 kHz, duty circle 50%):

Power dependence on current in the quasi-CW mode (frequency 0.5 kHz, duty circle 50%):