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A new superbright LED stimulator: photodiode-feedback design for linearizing and stabilizing emitted light
T Watanabe1, N Mori, F Nakamura
1Department of Electrical Engineering, Tokyo University of Science, Faculty of Science and Technology, Chiba, Japan.
Vision Research
|May 1, 1992
Summary
Researchers developed a reliable LED photic generator for vision research. This device offers precise control of light stimuli, crucial for accurate analog stimulus presentation in experiments.
Area of Science:
- Vision Science
- Optics
- Biomedical Engineering
Background:
- Accurate analog stimulus presentation is critical in vision research.
- Existing photic generators may lack reliability or precise control.
- The need for advanced instrumentation in visual neuroscience is ongoing.
Purpose of the Study:
- To describe a novel, reliable Light Emitting Diode (LED) photic generator.
- To detail the design and performance of a Maxwellian-view stimulator.
- To evaluate the device's suitability for precise analog stimulus presentation.
Main Methods:
- Utilized a "superbright" red-emitting diode.
- Implemented optical feedback control using a PIN-photodiode.
- Constructed a Maxwellian-view stimulator.
Main Results:
- Achieved retinal illuminance intensities exceeding 26,000 trolands (td).
- Demonstrated a linear dynamic range of 3.7 log units.
- Exhibited excellent linearity (distortion < 0.12% at 100 Hz), frequency response (DC to 2 kHz), stability (0.0002% fluctuation), and signal-to-noise ratio (> 76 dB).
Conclusions:
- The developed LED photic generator is a reliable tool for vision research.
- The device provides precise and stable analog stimulus presentation.
- This instrument advances capabilities for studying visual perception and neuroscience.