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.

SDM Synchronous Detector



SDM synchronous detector measures the voltage signal from the output of photodiode preamplifier and converts it to the DC voltage signal proportional to amplitude of voltage from input.


• Three independent channels for detection. One can connect three systems with drivers and preamplifiers and run them through the synchronous detector simultaneously.
• Built-in power supply for preamplifiers.
• Possibility of input polarity inversion using the appropriate jumper. In case of wrong polarity connection from photodiode preamplifier one can simply switch the input polarity inversion jumper.


Main characteristics
Parameter Value
Input voltage Stabilized +12 V
Voltage tolerance
-5..+5 %
Power supply current, max 
< 0.1 A 
Board dimensions 70×70×19 mm 
Preamplifier supply output voltage  5 V
Output constant voltage signal, max 10 V
Adjustable parameters
Parameter Value
Averaging time 
100/200/300 µs 
Signal gain 1x/5x/10x 
Supported Operation Modes 
Signal data Pulse mode
Pulse duration
2-20 µs 
Repetition rate 0.5-16 kHz 
Current amplitude 0.4-2.0 A