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Pulse-modulated light source for psychometric and vision experiments.

C N Scholfield, M Murdock

    Journal of Neuroscience Methods
    |March 1, 1987
    PubMed
    Summary
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    This study demonstrates a novel method for precisely controlling light intensity using light-emitting diodes (LEDs) and a frequency meter. The system offers accurate, linear light output for various applications.

    Area of Science:

    • Optoelectronics
    • Instrumentation

    Background:

    • Accurate control of light intensity is crucial for various scientific and industrial applications.
    • Existing methods may lack precision or flexibility in light modulation.

    Purpose of the Study:

    • To develop a simple and accurate system for controlling light intensity using light-emitting diodes (LEDs).
    • To demonstrate a linear relationship between a measurable electronic parameter and light output intensity.

    Main Methods:

    • Utilized light-emitting diodes (LEDs) of various colors as controllable light sources.
    • Generated 800-ns current pulses at variable frequencies (1-1000 kHz) using a voltage-controlled oscillator.
    • Incorporated an antilogarithmic amplifier and a gating circuit for optional flicker generation (1-100 Hz).

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  • Employed a frequency meter to monitor the oscillator's output, correlating it with light intensity.

    • Main Results:

    • Achieved variable light intensity control by adjusting current pulse frequencies.
    • Demonstrated that the frequency meter reading provides a linear indication of the light intensity.
    • The system allowed for optional flicker modulation of the light output.

    Conclusions:

    • The developed system offers a precise and linear method for controlling LED light intensity.
    • The use of a frequency meter provides a straightforward and accurate means of intensity indication.
    • This technique is suitable for applications requiring controllable and stable light sources.