A new superbright LED stimulator: Photodiode-feedback design for linearizing and stabilizing emitted light

A new superbright LED stimulator: Photodiode-feedback design for linearizing and stabilizing emitted light

A new, reliable LED photic generator is described for analog stimulus presentation in vision research. A “superbright” red-emitting diode is controlled via optical feedback using a PIN-photodiode. A Maxwellian-view stimulator developed this way has been proven capable of covering intensities of reti...

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Veröffentlicht in:Vision research (Oxford) 1992-05, Vol.32 (5), p.953-961
Hauptverfasser: Watanabe, Takeru, Mori, Norimasa, Nakamura, Fukuzo
Format: Artikel
Sprache:eng
Schlagworte:
Electronics
Humans
Light
Mathematics
Maxwellian-view source
Optical feedback
Photic Stimulation - instrumentation
Photo-reference
Photometry
PIN-photodiode
Pupil - radiation effects
Superbright LED
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Zusammenfassung:A new, reliable LED photic generator is described for analog stimulus presentation in vision research. A “superbright” red-emitting diode is controlled via optical feedback using a PIN-photodiode. A Maxwellian-view stimulator developed this way has been proven capable of covering intensities of retinal illuminance of over 26,000 td with a linear dynamic range of 3.7 log units. The device also has outstanding properties in linearity (distortion < 0.12% at 100 Hz), frequency characteristics (d.c. to 2 kHz full-modulation bandwidth), stability (0.0002% fluctuation), and noise (S/N ratio greater than 76 dB).
ISSN:0042-6989
1878-5646
DOI:10.1016/0042-6989(92)90038-K