Fast switching of light-emitting diodes

Brailovsky, A. B.; Mitin, Vladimir

doi:10.1016/s0038-1101(99)00297-x

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…The reference value is obtained by a counter instrument configured to measure the time delay between two pulses when the signal level exceeds a set voltage level. Given that the LED switch-on time is in the order of nanoseconds [22,23], the influence on the operation of the device is negligible.…”

Section: Methodsmentioning

confidence: 99%

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Development of a Reference Device for the Calibration of Optical One-Shot Time-Interval Measurements

et al. 2023

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This paper presents the development of a device that creates two or more light pulses with a precision time delay in a range from microseconds to several seconds and for the purpose of the calibration of velocity of detonation (VOD) measurement instruments. The device was assembled, programmed, and tested for functionality. Measurements were conducted using a reference counter. First, a precision OCXO (oven-controlled crystal oscillator) was used as a clock source. For verification of programmed subroutines, a counter oscillator output port was used as a source of clock signal for the microcontroller. This enabled the cancellation of possible oscillator errors. The signal had to be converted from an AC sine signal to a signal with positive values only using a clamper circuit. By the proposed solution, a calculable standard of time delay between two light pulses was achieved. According to the obtained results, this device can be used to calibrate field measurement devices for VOD measurements in explosives or some other use where the measurement device records the time interval between multiple light pulses. This enables more confidence in measurement results, faster recognition of instrument drift and increases the quality of measurement.

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Section: Methodsmentioning

confidence: 99%

“…Given that the LED switch-on time is in the order of nanoseconds [22,23], the influence on the operation of the device is negligible.…”

Section: Methodsmentioning

confidence: 99%

Development of a Reference Device for the Calibration of Optical One-Shot Time-Interval Measurements

et al. 2023

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“…They possess a number of desirable attributes. These include true colour representation [16][17][18], high brightness [15,19], robustness and long lifetime of operation [20] and, importantly, rapid on and off switching times [21,22]. Such characteristics have led to their widespread use in a range of existing lighting applications including backlighting (mobile phones, cameras, and more recently LCD TV screens), outdoor lighting (automotive indicators and traffic light signals), and even general lighting replacing that of incandescent and fluorescent sources.…”

Section: Light Emitting Diodes As a Tachistoscopementioning

confidence: 99%

Light Emitting Diodes as a Rapid Visual Display for Use in Psychological Experiments

Thurgood¹,

Whitfield²

2013

OPJ

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In this paper we show how light emitting diodes (LEDs) can be used in conjunction with existing display technologies as a means for achieving ultra-rapid visual stimulus exposure durations. We review existing rapid visual display methods, and show how our apparatus overcomes the limitations inherent with each technique. Our apparatus, the LED tachistoscope, takes advantage of the fast-switching times and high-brightness capabilities of LEDs in order to present stimuli at previously unachievable durations as rapid as 1 ms. The rapid exposure durations are achieved by external LED backlight illumination of images on a liquid crystal display (LCD) after the components of the LCD have stabilized. This ensures that stimulus onset and offset are discrete. Furthermore, the fast-switching of the LEDs enables stimuli to be revealed for very rapid durations. The paper also describes studies in which the LED tachistoscope has already been applied, and offers suggestions for other possible applications. Interestingly, in our studies we show that the human visual system is very adept at extracting information with only very minimal stimulus exposure durations. Such studies have not been possible with existing display equipment. The LED tachistoscope opens up avenues for a variety of psychological and physiological experiments and provides a means for revealing the limits of human visual perception.

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OCDMA and OSTBC based VLC transceiver design using NI cDAQ

Khalid

Asif

2017

Photon Netw Commun

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Fast switching of light-emitting diodes

Cited by 8 publications

References 12 publications

Development of a Reference Device for the Calibration of Optical One-Shot Time-Interval Measurements

Development of a Reference Device for the Calibration of Optical One-Shot Time-Interval Measurements

Light Emitting Diodes as a Rapid Visual Display for Use in Psychological Experiments

OCDMA and OSTBC based VLC transceiver design using NI cDAQ

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