I have encountered this sensor datasheet, and I couldn't figure out its output. Normally, a sensor should output voltage, current etc. and has calibration or sensitivity for us to translate it to what is being measured.

I couldn't figure out how this sensor is interfaced and measured.


1 Answer 1


Like all photodiodes it is rated on A/W for IR input wavelengths and depends on aperture chip size w. For mW of optical power it has very low sensitivity yet extremely fast response in ns. So instead of a silicon diode of perhaps 0.5A/W it is 0.008 A/W for a 1mm aperture in one case.

The output is in uA/mW of IR power for use with a high speed transimpedance amplifier with a low source impedance from the detector.

It uses a special semiconductor for IR sensitivity

  • \$\begingroup\$ Sorry maybe it is a bit stupid question but what is the output of this sensor? Current or voltage? If I measure 0.5A it corresponds to 1W? \$\endgroup\$
    – floppy380
    Feb 26, 2021 at 19:55
  • \$\begingroup\$ Do photovoltaic detectors works same way as photodiode? \$\endgroup\$
    – floppy380
    Feb 26, 2021 at 19:57
  • \$\begingroup\$ Here is another example vigo.com.pl/wp-content/uploads/2020/11/… \$\endgroup\$
    – floppy380
    Feb 26, 2021 at 19:59
  • \$\begingroup\$ That one doesn’t ’ the use Hg or CD but is cooled to reduce noise and raise sensitivity greatly Current responsivity Ri(λpeak), A/W ≥1.3 ≥1 yet not quite as fast \$\endgroup\$ Feb 26, 2021 at 20:04
  • 1
    \$\begingroup\$ Thanks for giving some hint I need to read more about photodiodes I guess \$\endgroup\$
    – floppy380
    Feb 26, 2021 at 20:21

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