Phresh Photonics’ SiQu50-M is a complete module that combines a Silicon Quadrant Photodiode with amplifiers and position sensing circuitry in a practical 2” X 1.25” rugged UL approved housing. With excellent response in the Vis-NIR this quadrant photodiode module can be used with most any light source.  The SiQu50-M provides output voltages of both the sum of each of the quadrants as well as the differences of Top minus Bottom and Left minus Right. This quadrant photodiode module can be used to very accurately determine the location and position of a light beam.

Alternative versions with smaller / UV enhanced quads are also available.

Typical applications include laser beam alignment (including in a feedback loop) and target acquisition.

Specifications:

Total Sensing Area                   50mm2 / 8mm^Ø

Spectral Response                          400-1100nm

Supply Voltage                           15V typ (5-18V)

Output Voltage                           +V_cc-3 : -V_cc+3

Output Current Limit                                25 mA

Maximum Slew Rate                               10V/µS

Frequency Response (-3db)                     250kHz

Noise (theoretical)                               15nV/ √Hz

Operating Temperature                           0-70^OC

Outputs:

The SiQu50-M requires an applied voltage of 5-18V. The outputs are the current generated by the photodiode elements after amplification through a current to voltage amplifier of 1000 (10⁴). A 9 pin connector allows for easy connection.

Pin 1           =    PD Bias

Pin 2           =    (Q1+Q4) - (Q2+Q3)

Pin 3           =     +15V

Pin 4           =     -15V

Pin 6           =     (Q1+Q2) - (Q3+Q4)

Pin 7           =    Q1+Q2+Q3+Q4

Pin 8           =    Ground