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Optoelectronics Infrared Glossary of Terms
| Term | Definition |
|---|---|
| Aperture Width | Width of the built-in openings in front of the emitter and photosensor that define the size of the beam. |
| BVCEO> | Collector-Emitter Breakdown Voltage with the base open. |
| Emission Angle @ 1/2 Power | Angle of the cone where the light intensity is half that on the optical axis. |
| ICC Supply Current | Current drawn from the supply at a given voltage. |
| ICEO | Collector-Emitter current for radiant sensitive devices when the base is open and without radiant incidence. |
| IF | Current flowing through a diode from anode to cathode. |
| IF+ | Diode forward current (IF) required to cause the output to turn on. |
| IF- | Diode forward current (IF) required to cause the output to turn off. |
| IR | Current flowing through a diode from cathode to anode. |
| IR(D) | Reverse dark current for a given supply voltage. |
| Lead Spacing | Distance between the leads from the emitter side of the package to the photosensor side. |
| Light Current | Current which flows through a device due to radiant incidence. |
| Negative Threshold | Amount of incident light at which the device turns off. |
| On-State Collector Current | Collector current at a specified radiant incidence and a specified collector voltage. |
| Operating Supply Voltage | Voltage under which the device operates. |
| Output Configuration | Output circuit and function. |
| Output Power | The radiant intensity of emitted light measured in mW/sr. |
| Positive Threshold | Amount of incident light required to turn the device on. |
| Reception Angle @ 1/2 Power | Angle of the cone where the sensitivity is half that on the optical axis. |
| VF | Voltage between anode and cathode at a specified forward current. |
| VR | Voltage between cathode and anode at a specified reverse current. |
