MIL-PRF-19500P
APPENDIX B
B.7 OPTOELECTRONIC DEVICES SYMBOLS
B.7.1 Optoelectronic device symbols.
Q, (Qe) ..................................................... Radiant energy
Q, (Qv) ..................................................... Luminous energy
td .............................................................. Delay time
tf ............................................................... Fall time
toff ............................................................ Turn-off time
ton ............................................................ Turn-on time
tr ............................................................... Rise time
ts .............................................................. Storage time
τ ............................................................... Time constant
φ ............................................................... Luminous flux, radiant flux
B.7.2 Photosensitive device symbols.
AD ............................................................ Area, detector
E............................................................... Illuminance (illumination); irradiance
fmod ......................................................... Modulation frequency
In .............................................................. Detector noise
IS, Is ......................................................... Detector signal current (dc; rms value of ac component)
Pn............................................................. Noise equivalent power
Vn............................................................. Detector noise voltage
VS, Vs ...................................................... Detector signal voltage (dc; rms value of ac component)
µf .............................................................. Noise equivalent bandwidth
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